253f2c213f
NOTE: Linear blending is currently disabled in this CL as the
feature is still a work in progress
Android currently performs all blending (any kind of linear math
on colors really) on gamma-encoded colors. Since Android assumes
that the default color space is sRGB, all bitmaps and colors
are encoded with the sRGB Opto-Electronic Conversion Function
(OECF, which can be approximated with a power function). Since
the power curve is not linear, our linear math is incorrect.
The result is that we generate colors that tend to be too dark;
this affects blending but also anti-aliasing, gradients, blurs,
etc.
The solution is to convert gamma-encoded colors back to linear
space before doing any math on them, using the sRGB Electo-Optical
Conversion Function (EOCF). This is achieved in different
ways in different parts of the pipeline:
- Using hardware conversions when sampling from OpenGL textures
or writing into OpenGL frame buffers
- Using software conversion functions, to translate app-supplied
colors to and from sRGB
- Using Skia's color spaces
Any type of processing on colors must roughly ollow these steps:
[sRGB input]->EOCF->[linear data]->[processing]->OECF->[sRGB output]
For the sRGB color space, the conversion functions are defined as
follows:
OECF(linear) :=
linear <= 0.0031308 ? linear * 12.92 : (pow(linear, 1/2.4) * 1.055) - 0.055
EOCF(srgb) :=
srgb <= 0.04045 ? srgb / 12.92 : pow((srgb + 0.055) / 1.055, 2.4)
The EOCF is simply the reciprocal of the OECF.
While it is highly recommended to use the exact sRGB conversion
functions everywhere possible, it is sometimes useful or beneficial
to rely on approximations:
- pow(x,2.2) and pow(x,1/2.2)
- x^2 and sqrt(x)
The latter is particularly useful in fragment shaders (for instance
to apply dithering in sRGB space), especially if the sqrt() can be
replaced with an inversesqrt().
Here is a fairly exhaustive list of modifications implemented
in this CL:
- Set TARGET_ENABLE_LINEAR_BLENDING := false in BoardConfig.mk
to disable linear blending. This is only for GLES 2.0 GPUs
with no hardware sRGB support. This flag is currently assumed
to be false (see note above)
- sRGB writes are disabled when entering a functor (WebView).
This will need to be fixed at some point
- Skia bitmaps are created with the sRGB color space
- Bitmaps using a 565 config are expanded to 888
- Linear blending is disabled when entering a functor
- External textures are not properly sampled (see below)
- Gradients are interpolated in linear space
- Texture-based dithering was replaced with analytical dithering
- Dithering is done in the quantization color space, which is
why we must do EOCF(OECF(color)+dither)
- Text is now gamma corrected differently depending on the luminance
of the source pixel. The asumption is that a bright pixel will be
blended on a dark background and the other way around. The source
alpha is gamma corrected to thicken dark on bright and thin
bright on dark to match the intended design of fonts. This also
matches the behavior of popular design/drawing applications
- Removed the asset atlas. It did not contain anything useful and
could not be sampled in sRGB without a yet-to-be-defined GL
extension
- The last column of color matrices is converted to linear space
because its value are added to linear colors
Missing features:
- Resource qualifier?
- Regeneration of goldeng images for automated tests
- Handle alpha8/grey8 properly
- Disable sRGB write for layers with external textures
Test: Manual testing while work in progress
Bug: 29940137
Change-Id: I6a07b15ab49b554377cd33a36b6d9971a15e9a0b
869 lines
32 KiB
C++
869 lines
32 KiB
C++
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <utils/String8.h>
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#include "Caches.h"
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#include "ProgramCache.h"
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#include "Properties.h"
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namespace android {
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namespace uirenderer {
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///////////////////////////////////////////////////////////////////////////////
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// Defines
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///////////////////////////////////////////////////////////////////////////////
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#define MODULATE_OP_NO_MODULATE 0
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#define MODULATE_OP_MODULATE 1
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#define MODULATE_OP_MODULATE_A8 2
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#define STR(x) STR1(x)
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#define STR1(x) #x
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///////////////////////////////////////////////////////////////////////////////
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// Vertex shaders snippets
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///////////////////////////////////////////////////////////////////////////////
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const char* gVS_Header_Start =
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"#version 100\n"
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"attribute vec4 position;\n";
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const char* gVS_Header_Attributes_TexCoords =
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"attribute vec2 texCoords;\n";
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const char* gVS_Header_Attributes_Colors =
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"attribute vec4 colors;\n";
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const char* gVS_Header_Attributes_VertexAlphaParameters =
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"attribute float vtxAlpha;\n";
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const char* gVS_Header_Uniforms_TextureTransform =
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"uniform mat4 mainTextureTransform;\n";
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const char* gVS_Header_Uniforms =
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"uniform mat4 projection;\n" \
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"uniform mat4 transform;\n";
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const char* gVS_Header_Uniforms_HasGradient =
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"uniform mat4 screenSpace;\n";
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const char* gVS_Header_Uniforms_HasBitmap =
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"uniform mat4 textureTransform;\n"
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"uniform mediump vec2 textureDimension;\n";
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const char* gVS_Header_Uniforms_HasRoundRectClip =
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"uniform mat4 roundRectInvTransform;\n";
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const char* gVS_Header_Varyings_HasTexture =
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"varying vec2 outTexCoords;\n";
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const char* gVS_Header_Varyings_HasColors =
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"varying vec4 outColors;\n";
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const char* gVS_Header_Varyings_HasVertexAlpha =
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"varying float alpha;\n";
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const char* gVS_Header_Varyings_HasBitmap =
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"varying highp vec2 outBitmapTexCoords;\n";
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const char* gVS_Header_Varyings_HasGradient[6] = {
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// Linear
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"varying highp vec2 linear;\n",
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"varying float linear;\n",
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// Circular
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"varying highp vec2 circular;\n",
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"varying highp vec2 circular;\n",
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// Sweep
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"varying highp vec2 sweep;\n",
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"varying highp vec2 sweep;\n",
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};
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const char* gVS_Header_Varyings_HasRoundRectClip =
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"varying highp vec2 roundRectPos;\n";
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const char* gVS_Main =
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"\nvoid main(void) {\n";
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const char* gVS_Main_OutTexCoords =
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" outTexCoords = texCoords;\n";
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const char* gVS_Main_OutColors =
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" outColors = colors;\n";
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const char* gVS_Main_OutTransformedTexCoords =
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" outTexCoords = (mainTextureTransform * vec4(texCoords, 0.0, 1.0)).xy;\n";
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const char* gVS_Main_OutGradient[6] = {
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// Linear
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" linear = vec2((screenSpace * position).x, 0.5);\n",
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" linear = (screenSpace * position).x;\n",
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// Circular
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" circular = (screenSpace * position).xy;\n",
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" circular = (screenSpace * position).xy;\n",
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// Sweep
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" sweep = (screenSpace * position).xy;\n",
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" sweep = (screenSpace * position).xy;\n"
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};
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const char* gVS_Main_OutBitmapTexCoords =
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" outBitmapTexCoords = (textureTransform * position).xy * textureDimension;\n";
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const char* gVS_Main_Position =
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" vec4 transformedPosition = projection * transform * position;\n"
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" gl_Position = transformedPosition;\n";
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const char* gVS_Main_VertexAlpha =
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" alpha = vtxAlpha;\n";
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const char* gVS_Main_HasRoundRectClip =
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" roundRectPos = (roundRectInvTransform * transformedPosition).xy;\n";
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const char* gVS_Footer =
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"}\n\n";
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///////////////////////////////////////////////////////////////////////////////
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// Fragment shaders snippets
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///////////////////////////////////////////////////////////////////////////////
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const char* gFS_Header_Start =
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"#version 100\n";
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const char* gFS_Header_Extension_FramebufferFetch =
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"#extension GL_NV_shader_framebuffer_fetch : enable\n\n";
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const char* gFS_Header_Extension_ExternalTexture =
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"#extension GL_OES_EGL_image_external : require\n\n";
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const char* gFS_Header =
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"precision mediump float;\n\n";
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const char* gFS_Uniforms_Color =
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"uniform vec4 color;\n";
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const char* gFS_Uniforms_TextureSampler =
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"uniform sampler2D baseSampler;\n";
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const char* gFS_Uniforms_ExternalTextureSampler =
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"uniform samplerExternalOES baseSampler;\n";
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const char* gFS_Uniforms_GradientSampler[2] = {
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"uniform vec2 screenSize;\n"
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"uniform sampler2D gradientSampler;\n",
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"uniform vec2 screenSize;\n"
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"uniform vec4 startColor;\n"
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"uniform vec4 endColor;\n"
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};
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const char* gFS_Uniforms_BitmapSampler =
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"uniform sampler2D bitmapSampler;\n";
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const char* gFS_Uniforms_ColorOp[3] = {
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// None
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"",
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// Matrix
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"uniform mat4 colorMatrix;\n"
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"uniform vec4 colorMatrixVector;\n",
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// PorterDuff
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"uniform vec4 colorBlend;\n"
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};
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const char* gFS_Uniforms_HasRoundRectClip =
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"uniform vec4 roundRectInnerRectLTRB;\n"
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"uniform float roundRectRadius;\n";
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// Dithering must be done in the quantization space
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// When we are writing to an sRGB framebuffer, we must do the following:
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// EOCF(OECF(color) + dither)
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// We approximate the transfer functions with gamma 2.0 to avoid branches and pow()
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// The dithering pattern is generated with a triangle noise generator in the range [-0.5,1.5[
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// TODO: Handle linear fp16 render targets
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const char* gFS_Dither_Functions =
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"\nmediump float triangleNoise(const highp vec2 n) {\n"
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" highp vec2 p = fract(n * vec2(5.3987, 5.4421));\n"
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" p += dot(p.yx, p.xy + vec2(21.5351, 14.3137));\n"
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" highp float xy = p.x * p.y;\n"
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" return fract(xy * 95.4307) + fract(xy * 75.04961) - 0.5;\n"
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"}\n";
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const char* gFS_Dither_Preamble[2] = {
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// Linear framebuffer
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"\nvec4 dither(const vec4 color) {\n"
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" return vec4(color.rgb + (triangleNoise(gl_FragCoord.xy * screenSize.xy) / 255.0), color.a);"
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"}\n",
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// sRGB framebuffer
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"\nvec4 dither(const vec4 color) {\n"
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" vec3 dithered = sqrt(color.rgb) + (triangleNoise(gl_FragCoord.xy * screenSize.xy) / 255.0);\n"
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" return vec4(dithered * dithered, color.a);\n"
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"}\n"
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};
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// Uses luminance coefficients from Rec.709 to choose the appropriate gamma
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// The gamma() function assumes that bright text will be displayed on a dark
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// background and that dark text will be displayed on bright background
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// The gamma coefficient is chosen to thicken or thin the text accordingly
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// The dot product used to compute the luminance could be approximated with
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// a simple max(color.r, color.g, color.b)
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const char* gFS_Gamma_Preamble =
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"\n#define GAMMA (%.2f)\n"
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"#define GAMMA_INV (%.2f)\n"
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"\nfloat gamma(float a, const vec3 color) {\n"
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" float luminance = dot(color, vec3(0.2126, 0.7152, 0.0722));\n"
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" return pow(a, luminance < 0.5 ? GAMMA_INV : GAMMA);\n"
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"}\n";
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const char* gFS_Main =
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"\nvoid main(void) {\n"
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" vec4 fragColor;\n";
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const char* gFS_Main_AddDither =
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" fragColor = dither(fragColor);\n";
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// Fast cases
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const char* gFS_Fast_SingleColor =
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"\nvoid main(void) {\n"
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" gl_FragColor = color;\n"
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"}\n\n";
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const char* gFS_Fast_SingleTexture =
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"\nvoid main(void) {\n"
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" gl_FragColor = texture2D(baseSampler, outTexCoords);\n"
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"}\n\n";
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const char* gFS_Fast_SingleModulateTexture =
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"\nvoid main(void) {\n"
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" gl_FragColor = color.a * texture2D(baseSampler, outTexCoords);\n"
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"}\n\n";
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const char* gFS_Fast_SingleA8Texture =
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"\nvoid main(void) {\n"
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" gl_FragColor = texture2D(baseSampler, outTexCoords);\n"
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"}\n\n";
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const char* gFS_Fast_SingleA8Texture_ApplyGamma =
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"\nvoid main(void) {\n"
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" gl_FragColor = vec4(0.0, 0.0, 0.0, pow(texture2D(baseSampler, outTexCoords).a, GAMMA));\n"
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"}\n\n";
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const char* gFS_Fast_SingleModulateA8Texture =
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"\nvoid main(void) {\n"
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" gl_FragColor = color * texture2D(baseSampler, outTexCoords).a;\n"
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"}\n\n";
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const char* gFS_Fast_SingleModulateA8Texture_ApplyGamma =
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"\nvoid main(void) {\n"
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" gl_FragColor = color * gamma(texture2D(baseSampler, outTexCoords).a, color.rgb);\n"
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"}\n\n";
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const char* gFS_Fast_SingleGradient[2] = {
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"\nvoid main(void) {\n"
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" gl_FragColor = dither(texture2D(gradientSampler, linear));\n"
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"}\n\n",
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"\nvoid main(void) {\n"
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" gl_FragColor = dither(mix(startColor, endColor, clamp(linear, 0.0, 1.0)));\n"
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"}\n\n",
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};
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const char* gFS_Fast_SingleModulateGradient[2] = {
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"\nvoid main(void) {\n"
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" gl_FragColor = dither(color.a * texture2D(gradientSampler, linear));\n"
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"}\n\n",
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"\nvoid main(void) {\n"
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" gl_FragColor = dither(color.a * mix(startColor, endColor, clamp(linear, 0.0, 1.0)));\n"
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"}\n\n"
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};
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// General case
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const char* gFS_Main_FetchColor =
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" fragColor = color;\n";
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const char* gFS_Main_ModulateColor =
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" fragColor *= color.a;\n";
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const char* gFS_Main_ApplyVertexAlphaLinearInterp =
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" fragColor *= alpha;\n";
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const char* gFS_Main_ApplyVertexAlphaShadowInterp =
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// map alpha through shadow alpha sampler
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" fragColor *= texture2D(baseSampler, vec2(alpha, 0.5)).a;\n";
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const char* gFS_Main_FetchTexture[2] = {
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// Don't modulate
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" fragColor = texture2D(baseSampler, outTexCoords);\n",
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// Modulate
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" fragColor = color * texture2D(baseSampler, outTexCoords);\n"
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};
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const char* gFS_Main_FetchA8Texture[4] = {
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// Don't modulate
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" fragColor = texture2D(baseSampler, outTexCoords);\n",
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" fragColor = texture2D(baseSampler, outTexCoords);\n",
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// Modulate
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" fragColor = color * texture2D(baseSampler, outTexCoords).a;\n",
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" fragColor = color * gamma(texture2D(baseSampler, outTexCoords).a, color.rgb);\n",
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};
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const char* gFS_Main_FetchGradient[6] = {
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// Linear
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" vec4 gradientColor = texture2D(gradientSampler, linear);\n",
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" vec4 gradientColor = mix(startColor, endColor, clamp(linear, 0.0, 1.0));\n",
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// Circular
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" vec4 gradientColor = texture2D(gradientSampler, vec2(length(circular), 0.5));\n",
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" vec4 gradientColor = mix(startColor, endColor, clamp(length(circular), 0.0, 1.0));\n",
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// Sweep
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" highp float index = atan(sweep.y, sweep.x) * 0.15915494309; // inv(2 * PI)\n"
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" vec4 gradientColor = texture2D(gradientSampler, vec2(index - floor(index), 0.5));\n",
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" highp float index = atan(sweep.y, sweep.x) * 0.15915494309; // inv(2 * PI)\n"
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" vec4 gradientColor = mix(startColor, endColor, clamp(index - floor(index), 0.0, 1.0));\n"
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};
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const char* gFS_Main_FetchBitmap =
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" vec4 bitmapColor = texture2D(bitmapSampler, outBitmapTexCoords);\n";
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const char* gFS_Main_FetchBitmapNpot =
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" vec4 bitmapColor = texture2D(bitmapSampler, wrap(outBitmapTexCoords));\n";
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const char* gFS_Main_BlendShadersBG =
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" fragColor = blendShaders(gradientColor, bitmapColor)";
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const char* gFS_Main_BlendShadersGB =
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" fragColor = blendShaders(bitmapColor, gradientColor)";
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const char* gFS_Main_BlendShaders_Modulate[6] = {
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// Don't modulate
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";\n",
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";\n",
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// Modulate
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" * color.a;\n",
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" * color.a;\n",
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// Modulate with alpha 8 texture
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" * texture2D(baseSampler, outTexCoords).a;\n",
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" * gamma(texture2D(baseSampler, outTexCoords).a, color.rgb);\n",
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};
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const char* gFS_Main_GradientShader_Modulate[6] = {
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// Don't modulate
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" fragColor = gradientColor;\n",
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" fragColor = gradientColor;\n",
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// Modulate
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" fragColor = gradientColor * color.a;\n",
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" fragColor = gradientColor * color.a;\n",
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// Modulate with alpha 8 texture
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" fragColor = gradientColor * texture2D(baseSampler, outTexCoords).a;\n",
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" fragColor = gradientColor * gamma(texture2D(baseSampler, outTexCoords).a, gradientColor.rgb);\n",
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};
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const char* gFS_Main_BitmapShader_Modulate[6] = {
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// Don't modulate
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" fragColor = bitmapColor;\n",
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" fragColor = bitmapColor;\n",
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// Modulate
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" fragColor = bitmapColor * color.a;\n",
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" fragColor = bitmapColor * color.a;\n",
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// Modulate with alpha 8 texture
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" fragColor = bitmapColor * texture2D(baseSampler, outTexCoords).a;\n",
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" fragColor = bitmapColor * gamma(texture2D(baseSampler, outTexCoords).a, bitmapColor.rgb);\n",
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};
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const char* gFS_Main_FragColor =
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" gl_FragColor = fragColor;\n";
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const char* gFS_Main_FragColor_HasColors =
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" gl_FragColor *= outColors;\n";
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const char* gFS_Main_FragColor_Blend =
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" gl_FragColor = blendFramebuffer(fragColor, gl_LastFragColor);\n";
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const char* gFS_Main_FragColor_Blend_Swap =
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" gl_FragColor = blendFramebuffer(gl_LastFragColor, fragColor);\n";
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const char* gFS_Main_ApplyColorOp[3] = {
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// None
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"",
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// Matrix
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" fragColor.rgb /= (fragColor.a + 0.0019);\n" // un-premultiply
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" fragColor *= colorMatrix;\n"
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" fragColor += colorMatrixVector;\n"
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" fragColor.rgb *= (fragColor.a + 0.0019);\n", // re-premultiply
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// PorterDuff
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" fragColor = blendColors(colorBlend, fragColor);\n"
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};
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// Note: LTRB -> xyzw
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const char* gFS_Main_FragColor_HasRoundRectClip =
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" mediump vec2 fragToLT = roundRectInnerRectLTRB.xy - roundRectPos;\n"
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" mediump vec2 fragFromRB = roundRectPos - roundRectInnerRectLTRB.zw;\n"
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// divide + multiply by 128 to avoid falling out of range in length() function
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" mediump vec2 dist = max(max(fragToLT, fragFromRB), vec2(0.0, 0.0)) / 128.0;\n"
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" mediump float linearDist = roundRectRadius - (length(dist) * 128.0);\n"
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" gl_FragColor *= clamp(linearDist, 0.0, 1.0);\n";
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const char* gFS_Main_DebugHighlight =
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" gl_FragColor.rgb = vec3(0.0, gl_FragColor.a, 0.0);\n";
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const char* gFS_Footer =
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"}\n\n";
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///////////////////////////////////////////////////////////////////////////////
|
|
// PorterDuff snippets
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
const char* gBlendOps[18] = {
|
|
// Clear
|
|
"return vec4(0.0, 0.0, 0.0, 0.0);\n",
|
|
// Src
|
|
"return src;\n",
|
|
// Dst
|
|
"return dst;\n",
|
|
// SrcOver
|
|
"return src + dst * (1.0 - src.a);\n",
|
|
// DstOver
|
|
"return dst + src * (1.0 - dst.a);\n",
|
|
// SrcIn
|
|
"return src * dst.a;\n",
|
|
// DstIn
|
|
"return dst * src.a;\n",
|
|
// SrcOut
|
|
"return src * (1.0 - dst.a);\n",
|
|
// DstOut
|
|
"return dst * (1.0 - src.a);\n",
|
|
// SrcAtop
|
|
"return vec4(src.rgb * dst.a + (1.0 - src.a) * dst.rgb, dst.a);\n",
|
|
// DstAtop
|
|
"return vec4(dst.rgb * src.a + (1.0 - dst.a) * src.rgb, src.a);\n",
|
|
// Xor
|
|
"return vec4(src.rgb * (1.0 - dst.a) + (1.0 - src.a) * dst.rgb, "
|
|
"src.a + dst.a - 2.0 * src.a * dst.a);\n",
|
|
// Plus
|
|
"return min(src + dst, 1.0);\n",
|
|
// Modulate
|
|
"return src * dst;\n",
|
|
// Screen
|
|
"return src + dst - src * dst;\n",
|
|
// Overlay
|
|
"return clamp(vec4(mix("
|
|
"2.0 * src.rgb * dst.rgb + src.rgb * (1.0 - dst.a) + dst.rgb * (1.0 - src.a), "
|
|
"src.a * dst.a - 2.0 * (dst.a - dst.rgb) * (src.a - src.rgb) + src.rgb * (1.0 - dst.a) + dst.rgb * (1.0 - src.a), "
|
|
"step(dst.a, 2.0 * dst.rgb)), "
|
|
"src.a + dst.a - src.a * dst.a), 0.0, 1.0);\n",
|
|
// Darken
|
|
"return vec4(src.rgb * (1.0 - dst.a) + (1.0 - src.a) * dst.rgb + "
|
|
"min(src.rgb * dst.a, dst.rgb * src.a), src.a + dst.a - src.a * dst.a);\n",
|
|
// Lighten
|
|
"return vec4(src.rgb * (1.0 - dst.a) + (1.0 - src.a) * dst.rgb + "
|
|
"max(src.rgb * dst.a, dst.rgb * src.a), src.a + dst.a - src.a * dst.a);\n",
|
|
};
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
// Constructors/destructors
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
ProgramCache::ProgramCache(Extensions& extensions)
|
|
: mHasES3(extensions.getMajorGlVersion() >= 3)
|
|
, mHasSRGB(extensions.hasSRGB()) {
|
|
}
|
|
|
|
ProgramCache::~ProgramCache() {
|
|
clear();
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
// Cache management
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
void ProgramCache::clear() {
|
|
PROGRAM_LOGD("Clearing program cache");
|
|
mCache.clear();
|
|
}
|
|
|
|
Program* ProgramCache::get(const ProgramDescription& description) {
|
|
programid key = description.key();
|
|
if (key == (PROGRAM_KEY_TEXTURE | PROGRAM_KEY_A8_TEXTURE)) {
|
|
// program for A8, unmodulated, texture w/o shader (black text/path textures) is equivalent
|
|
// to standard texture program (bitmaps, patches). Consider them equivalent.
|
|
key = PROGRAM_KEY_TEXTURE;
|
|
}
|
|
|
|
auto iter = mCache.find(key);
|
|
Program* program = nullptr;
|
|
if (iter == mCache.end()) {
|
|
description.log("Could not find program");
|
|
program = generateProgram(description, key);
|
|
mCache[key] = std::unique_ptr<Program>(program);
|
|
} else {
|
|
program = iter->second.get();
|
|
}
|
|
return program;
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
// Program generation
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
Program* ProgramCache::generateProgram(const ProgramDescription& description, programid key) {
|
|
String8 vertexShader = generateVertexShader(description);
|
|
String8 fragmentShader = generateFragmentShader(description);
|
|
|
|
return new Program(description, vertexShader.string(), fragmentShader.string());
|
|
}
|
|
|
|
static inline size_t gradientIndex(const ProgramDescription& description) {
|
|
return description.gradientType * 2 + description.isSimpleGradient;
|
|
}
|
|
|
|
String8 ProgramCache::generateVertexShader(const ProgramDescription& description) {
|
|
// Add attributes
|
|
String8 shader(gVS_Header_Start);
|
|
if (description.hasTexture || description.hasExternalTexture) {
|
|
shader.append(gVS_Header_Attributes_TexCoords);
|
|
}
|
|
if (description.hasVertexAlpha) {
|
|
shader.append(gVS_Header_Attributes_VertexAlphaParameters);
|
|
}
|
|
if (description.hasColors) {
|
|
shader.append(gVS_Header_Attributes_Colors);
|
|
}
|
|
// Uniforms
|
|
shader.append(gVS_Header_Uniforms);
|
|
if (description.hasTextureTransform) {
|
|
shader.append(gVS_Header_Uniforms_TextureTransform);
|
|
}
|
|
if (description.hasGradient) {
|
|
shader.append(gVS_Header_Uniforms_HasGradient);
|
|
}
|
|
if (description.hasBitmap) {
|
|
shader.append(gVS_Header_Uniforms_HasBitmap);
|
|
}
|
|
if (description.hasRoundRectClip) {
|
|
shader.append(gVS_Header_Uniforms_HasRoundRectClip);
|
|
}
|
|
// Varyings
|
|
if (description.hasTexture || description.hasExternalTexture) {
|
|
shader.append(gVS_Header_Varyings_HasTexture);
|
|
}
|
|
if (description.hasVertexAlpha) {
|
|
shader.append(gVS_Header_Varyings_HasVertexAlpha);
|
|
}
|
|
if (description.hasColors) {
|
|
shader.append(gVS_Header_Varyings_HasColors);
|
|
}
|
|
if (description.hasGradient) {
|
|
shader.append(gVS_Header_Varyings_HasGradient[gradientIndex(description)]);
|
|
}
|
|
if (description.hasBitmap) {
|
|
shader.append(gVS_Header_Varyings_HasBitmap);
|
|
}
|
|
if (description.hasRoundRectClip) {
|
|
shader.append(gVS_Header_Varyings_HasRoundRectClip);
|
|
}
|
|
|
|
// Begin the shader
|
|
shader.append(gVS_Main); {
|
|
if (description.hasTextureTransform) {
|
|
shader.append(gVS_Main_OutTransformedTexCoords);
|
|
} else if (description.hasTexture || description.hasExternalTexture) {
|
|
shader.append(gVS_Main_OutTexCoords);
|
|
}
|
|
if (description.hasVertexAlpha) {
|
|
shader.append(gVS_Main_VertexAlpha);
|
|
}
|
|
if (description.hasColors) {
|
|
shader.append(gVS_Main_OutColors);
|
|
}
|
|
if (description.hasBitmap) {
|
|
shader.append(gVS_Main_OutBitmapTexCoords);
|
|
}
|
|
// Output transformed position
|
|
shader.append(gVS_Main_Position);
|
|
if (description.hasGradient) {
|
|
shader.append(gVS_Main_OutGradient[gradientIndex(description)]);
|
|
}
|
|
if (description.hasRoundRectClip) {
|
|
shader.append(gVS_Main_HasRoundRectClip);
|
|
}
|
|
}
|
|
// End the shader
|
|
shader.append(gVS_Footer);
|
|
|
|
PROGRAM_LOGD("*** Generated vertex shader:\n\n%s", shader.string());
|
|
|
|
return shader;
|
|
}
|
|
|
|
static bool shaderOp(const ProgramDescription& description, String8& shader,
|
|
const int modulateOp, const char** snippets) {
|
|
int op = description.hasAlpha8Texture ? MODULATE_OP_MODULATE_A8 : modulateOp;
|
|
op = op * 2 + description.hasGammaCorrection;
|
|
shader.append(snippets[op]);
|
|
return description.hasAlpha8Texture;
|
|
}
|
|
|
|
String8 ProgramCache::generateFragmentShader(const ProgramDescription& description) {
|
|
String8 shader(gFS_Header_Start);
|
|
|
|
const bool blendFramebuffer = description.framebufferMode >= SkXfermode::kPlus_Mode;
|
|
if (blendFramebuffer) {
|
|
shader.append(gFS_Header_Extension_FramebufferFetch);
|
|
}
|
|
if (description.hasExternalTexture) {
|
|
shader.append(gFS_Header_Extension_ExternalTexture);
|
|
}
|
|
|
|
shader.append(gFS_Header);
|
|
|
|
// Varyings
|
|
if (description.hasTexture || description.hasExternalTexture) {
|
|
shader.append(gVS_Header_Varyings_HasTexture);
|
|
}
|
|
if (description.hasVertexAlpha) {
|
|
shader.append(gVS_Header_Varyings_HasVertexAlpha);
|
|
}
|
|
if (description.hasColors) {
|
|
shader.append(gVS_Header_Varyings_HasColors);
|
|
}
|
|
if (description.hasGradient) {
|
|
shader.append(gVS_Header_Varyings_HasGradient[gradientIndex(description)]);
|
|
}
|
|
if (description.hasBitmap) {
|
|
shader.append(gVS_Header_Varyings_HasBitmap);
|
|
}
|
|
if (description.hasRoundRectClip) {
|
|
shader.append(gVS_Header_Varyings_HasRoundRectClip);
|
|
}
|
|
|
|
// Uniforms
|
|
int modulateOp = MODULATE_OP_NO_MODULATE;
|
|
const bool singleColor = !description.hasTexture && !description.hasExternalTexture &&
|
|
!description.hasGradient && !description.hasBitmap;
|
|
|
|
if (description.modulate || singleColor) {
|
|
shader.append(gFS_Uniforms_Color);
|
|
if (!singleColor) modulateOp = MODULATE_OP_MODULATE;
|
|
}
|
|
if (description.hasTexture || description.useShadowAlphaInterp) {
|
|
shader.append(gFS_Uniforms_TextureSampler);
|
|
} else if (description.hasExternalTexture) {
|
|
shader.append(gFS_Uniforms_ExternalTextureSampler);
|
|
}
|
|
if (description.hasGradient) {
|
|
shader.append(gFS_Uniforms_GradientSampler[description.isSimpleGradient]);
|
|
}
|
|
if (description.hasRoundRectClip) {
|
|
shader.append(gFS_Uniforms_HasRoundRectClip);
|
|
}
|
|
|
|
if (description.hasGammaCorrection) {
|
|
shader.appendFormat(gFS_Gamma_Preamble, Properties::textGamma, 1.0f / Properties::textGamma);
|
|
}
|
|
|
|
// Optimization for common cases
|
|
if (!description.hasVertexAlpha
|
|
&& !blendFramebuffer
|
|
&& !description.hasColors
|
|
&& description.colorOp == ProgramDescription::ColorFilterMode::None
|
|
&& !description.hasDebugHighlight
|
|
&& !description.hasRoundRectClip) {
|
|
bool fast = false;
|
|
|
|
const bool noShader = !description.hasGradient && !description.hasBitmap;
|
|
const bool singleTexture = (description.hasTexture || description.hasExternalTexture) &&
|
|
!description.hasAlpha8Texture && noShader;
|
|
const bool singleA8Texture = description.hasTexture &&
|
|
description.hasAlpha8Texture && noShader;
|
|
const bool singleGradient = !description.hasTexture && !description.hasExternalTexture &&
|
|
description.hasGradient && !description.hasBitmap &&
|
|
description.gradientType == ProgramDescription::kGradientLinear;
|
|
|
|
if (singleColor) {
|
|
shader.append(gFS_Fast_SingleColor);
|
|
fast = true;
|
|
} else if (singleTexture) {
|
|
if (!description.modulate) {
|
|
shader.append(gFS_Fast_SingleTexture);
|
|
} else {
|
|
shader.append(gFS_Fast_SingleModulateTexture);
|
|
}
|
|
fast = true;
|
|
} else if (singleA8Texture) {
|
|
if (!description.modulate) {
|
|
if (description.hasGammaCorrection) {
|
|
shader.append(gFS_Fast_SingleA8Texture_ApplyGamma);
|
|
} else {
|
|
shader.append(gFS_Fast_SingleA8Texture);
|
|
}
|
|
} else {
|
|
if (description.hasGammaCorrection) {
|
|
shader.append(gFS_Fast_SingleModulateA8Texture_ApplyGamma);
|
|
} else {
|
|
shader.append(gFS_Fast_SingleModulateA8Texture);
|
|
}
|
|
}
|
|
fast = true;
|
|
} else if (singleGradient) {
|
|
shader.append(gFS_Dither_Functions);
|
|
shader.append(gFS_Dither_Preamble[mHasSRGB]);
|
|
if (!description.modulate) {
|
|
shader.append(gFS_Fast_SingleGradient[description.isSimpleGradient]);
|
|
} else {
|
|
shader.append(gFS_Fast_SingleModulateGradient[description.isSimpleGradient]);
|
|
}
|
|
fast = true;
|
|
}
|
|
|
|
if (fast) {
|
|
#if DEBUG_PROGRAMS
|
|
PROGRAM_LOGD("*** Fast case:\n");
|
|
PROGRAM_LOGD("*** Generated fragment shader:\n\n");
|
|
printLongString(shader);
|
|
#endif
|
|
|
|
return shader;
|
|
}
|
|
}
|
|
|
|
if (description.hasBitmap) {
|
|
shader.append(gFS_Uniforms_BitmapSampler);
|
|
}
|
|
shader.append(gFS_Uniforms_ColorOp[static_cast<int>(description.colorOp)]);
|
|
|
|
// Generate required functions
|
|
if (description.hasGradient && description.hasBitmap) {
|
|
generateBlend(shader, "blendShaders", description.shadersMode);
|
|
}
|
|
if (description.colorOp == ProgramDescription::ColorFilterMode::Blend) {
|
|
generateBlend(shader, "blendColors", description.colorMode);
|
|
}
|
|
if (blendFramebuffer) {
|
|
generateBlend(shader, "blendFramebuffer", description.framebufferMode);
|
|
}
|
|
if (description.isBitmapNpot) {
|
|
generateTextureWrap(shader, description.bitmapWrapS, description.bitmapWrapT);
|
|
}
|
|
if (description.hasGradient) {
|
|
shader.append(gFS_Dither_Functions);
|
|
shader.append(gFS_Dither_Preamble[mHasSRGB]);
|
|
}
|
|
|
|
// Begin the shader
|
|
shader.append(gFS_Main); {
|
|
// Stores the result in fragColor directly
|
|
if (description.hasTexture || description.hasExternalTexture) {
|
|
if (description.hasAlpha8Texture) {
|
|
if (!description.hasGradient && !description.hasBitmap) {
|
|
shader.append(
|
|
gFS_Main_FetchA8Texture[modulateOp * 2 + description.hasGammaCorrection]);
|
|
}
|
|
} else {
|
|
shader.append(gFS_Main_FetchTexture[modulateOp]);
|
|
}
|
|
} else {
|
|
if (!description.hasGradient && !description.hasBitmap) {
|
|
shader.append(gFS_Main_FetchColor);
|
|
}
|
|
}
|
|
if (description.hasGradient) {
|
|
shader.append(gFS_Main_FetchGradient[gradientIndex(description)]);
|
|
}
|
|
if (description.hasBitmap) {
|
|
if (!description.isBitmapNpot) {
|
|
shader.append(gFS_Main_FetchBitmap);
|
|
} else {
|
|
shader.append(gFS_Main_FetchBitmapNpot);
|
|
}
|
|
}
|
|
bool applyModulate = false;
|
|
// Case when we have two shaders set
|
|
if (description.hasGradient && description.hasBitmap) {
|
|
if (description.isBitmapFirst) {
|
|
shader.append(gFS_Main_BlendShadersBG);
|
|
} else {
|
|
shader.append(gFS_Main_BlendShadersGB);
|
|
}
|
|
applyModulate = shaderOp(description, shader, modulateOp,
|
|
gFS_Main_BlendShaders_Modulate);
|
|
} else {
|
|
if (description.hasGradient) {
|
|
applyModulate = shaderOp(description, shader, modulateOp,
|
|
gFS_Main_GradientShader_Modulate);
|
|
} else if (description.hasBitmap) {
|
|
applyModulate = shaderOp(description, shader, modulateOp,
|
|
gFS_Main_BitmapShader_Modulate);
|
|
}
|
|
}
|
|
|
|
if (description.modulate && applyModulate) {
|
|
shader.append(gFS_Main_ModulateColor);
|
|
}
|
|
|
|
// Apply the color op if needed
|
|
shader.append(gFS_Main_ApplyColorOp[static_cast<int>(description.colorOp)]);
|
|
|
|
if (description.hasVertexAlpha) {
|
|
if (description.useShadowAlphaInterp) {
|
|
shader.append(gFS_Main_ApplyVertexAlphaShadowInterp);
|
|
} else {
|
|
shader.append(gFS_Main_ApplyVertexAlphaLinearInterp);
|
|
}
|
|
}
|
|
|
|
if (description.hasGradient) {
|
|
shader.append(gFS_Main_AddDither);
|
|
}
|
|
|
|
// Output the fragment
|
|
if (!blendFramebuffer) {
|
|
shader.append(gFS_Main_FragColor);
|
|
} else {
|
|
shader.append(!description.swapSrcDst ?
|
|
gFS_Main_FragColor_Blend : gFS_Main_FragColor_Blend_Swap);
|
|
}
|
|
if (description.hasColors) {
|
|
shader.append(gFS_Main_FragColor_HasColors);
|
|
}
|
|
if (description.hasRoundRectClip) {
|
|
shader.append(gFS_Main_FragColor_HasRoundRectClip);
|
|
}
|
|
if (description.hasDebugHighlight) {
|
|
shader.append(gFS_Main_DebugHighlight);
|
|
}
|
|
}
|
|
// End the shader
|
|
shader.append(gFS_Footer);
|
|
|
|
#if DEBUG_PROGRAMS
|
|
PROGRAM_LOGD("*** Generated fragment shader:\n\n");
|
|
printLongString(shader);
|
|
#endif
|
|
|
|
return shader;
|
|
}
|
|
|
|
void ProgramCache::generateBlend(String8& shader, const char* name, SkXfermode::Mode mode) {
|
|
shader.append("\nvec4 ");
|
|
shader.append(name);
|
|
shader.append("(vec4 src, vec4 dst) {\n");
|
|
shader.append(" ");
|
|
shader.append(gBlendOps[mode]);
|
|
shader.append("}\n");
|
|
}
|
|
|
|
void ProgramCache::generateTextureWrap(String8& shader, GLenum wrapS, GLenum wrapT) {
|
|
shader.append("\nhighp vec2 wrap(highp vec2 texCoords) {\n");
|
|
if (wrapS == GL_MIRRORED_REPEAT) {
|
|
shader.append(" highp float xMod2 = mod(texCoords.x, 2.0);\n");
|
|
shader.append(" if (xMod2 > 1.0) xMod2 = 2.0 - xMod2;\n");
|
|
}
|
|
if (wrapT == GL_MIRRORED_REPEAT) {
|
|
shader.append(" highp float yMod2 = mod(texCoords.y, 2.0);\n");
|
|
shader.append(" if (yMod2 > 1.0) yMod2 = 2.0 - yMod2;\n");
|
|
}
|
|
shader.append(" return vec2(");
|
|
switch (wrapS) {
|
|
case GL_CLAMP_TO_EDGE:
|
|
shader.append("texCoords.x");
|
|
break;
|
|
case GL_REPEAT:
|
|
shader.append("mod(texCoords.x, 1.0)");
|
|
break;
|
|
case GL_MIRRORED_REPEAT:
|
|
shader.append("xMod2");
|
|
break;
|
|
}
|
|
shader.append(", ");
|
|
switch (wrapT) {
|
|
case GL_CLAMP_TO_EDGE:
|
|
shader.append("texCoords.y");
|
|
break;
|
|
case GL_REPEAT:
|
|
shader.append("mod(texCoords.y, 1.0)");
|
|
break;
|
|
case GL_MIRRORED_REPEAT:
|
|
shader.append("yMod2");
|
|
break;
|
|
}
|
|
shader.append(");\n");
|
|
shader.append("}\n");
|
|
}
|
|
|
|
void ProgramCache::printLongString(const String8& shader) const {
|
|
ssize_t index = 0;
|
|
ssize_t lastIndex = 0;
|
|
const char* str = shader.string();
|
|
while ((index = shader.find("\n", index)) > -1) {
|
|
String8 line(str, index - lastIndex);
|
|
if (line.length() == 0) line.append("\n");
|
|
ALOGD("%s", line.string());
|
|
index++;
|
|
str += (index - lastIndex);
|
|
lastIndex = index;
|
|
}
|
|
}
|
|
|
|
}; // namespace uirenderer
|
|
}; // namespace android
|