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Use global indices array to draw layers

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An array of indices local to a layer would only be necessary if
we changed the way we resolve T-junctions. Since we only ever
draw quads, let's just use the indices we use everywhere else.

This change also uses the global indices array to render list
of colored rectangles to save on the number of vertices generated
CPU-side.

Change-Id: Ia6d1970b0e9247805af5a114ca2a84b5d0b7c282
This commit is contained in:
Romain Guy
2013-07-22 13:57:50 -07:00
parent e4d4e20e8f
commit 448455fe78
5 changed files with 54 additions and 47 deletions
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2
libs/hwui/Layer.cpp
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@@ -31,7 +31,6 @@ namespace uirenderer {
Layer::Layer(const uint32_t layerWidth, const uint32_t layerHeight):
caches(Caches::getInstance()), texture(caches) {
mesh = NULL;
meshIndices = NULL;
meshElementCount = 0;
cacheable = true;
dirty = false;
@@ -57,7 +56,6 @@ Layer::~Layer() {
deleteTexture();
delete[] mesh;
delete[] meshIndices;
delete deferredList;
}

1
libs/hwui/Layer.h
View File

@@ -277,7 +277,6 @@ struct Layer {
* If the layer can be rendered as a mesh, this is non-null.
*/
TextureVertex* mesh;
uint16_t* meshIndices;
GLsizei meshElementCount;
/**

21
libs/hwui/LayerRenderer.cpp
View File

@@ -130,10 +130,7 @@ void LayerRenderer::generateMesh() {
if (mLayer->region.isRect() || mLayer->region.isEmpty()) {
if (mLayer->mesh) {
delete[] mLayer->mesh;
delete[] mLayer->meshIndices;
mLayer->mesh = NULL;
mLayer->meshIndices = NULL;
mLayer->meshElementCount = 0;
}
@@ -154,17 +151,11 @@ void LayerRenderer::generateMesh() {
if (mLayer->mesh && mLayer->meshElementCount < elementCount) {
delete[] mLayer->mesh;
delete[] mLayer->meshIndices;
mLayer->mesh = NULL;
mLayer->meshIndices = NULL;
}
bool rebuildIndices = false;
if (!mLayer->mesh) {
mLayer->mesh = new TextureVertex[count * 4];
mLayer->meshIndices = new uint16_t[elementCount];
rebuildIndices = true;
}
mLayer->meshElementCount = elementCount;
@@ -173,7 +164,6 @@ void LayerRenderer::generateMesh() {
const float height = mLayer->layer.getHeight();
TextureVertex* mesh = mLayer->mesh;
uint16_t* indices = mLayer->meshIndices;
for (size_t i = 0; i < count; i++) {
const android::Rect* r = &rects[i];
@@ -187,17 +177,6 @@ void LayerRenderer::generateMesh() {
TextureVertex::set(mesh++, r->right, r->top, u2, v1);
TextureVertex::set(mesh++, r->left, r->bottom, u1, v2);
TextureVertex::set(mesh++, r->right, r->bottom, u2, v2);
if (rebuildIndices) {
uint16_t quad = i * 4;
int index = i * 6;
indices[index ] = quad; // top-left
indices[index + 1] = quad + 1; // top-right
indices[index + 2] = quad + 2; // bottom-left
indices[index + 3] = quad + 2; // bottom-left
indices[index + 4] = quad + 1; // top-right
indices[index + 5] = quad + 3; // bottom-right
}
}
}

68
libs/hwui/OpenGLRenderer.cpp
View File

@@ -106,6 +106,15 @@ static const Blender gBlendsSwap[] = {
{ SkXfermode::kScreen_Mode, GL_ONE_MINUS_DST_COLOR, GL_ONE }
};
///////////////////////////////////////////////////////////////////////////////
// Functions
///////////////////////////////////////////////////////////////////////////////
template<typename T>
static inline T min(T a, T b) {
return a < b ? a : b;
}
///////////////////////////////////////////////////////////////////////////////
// Constructors/destructor
///////////////////////////////////////////////////////////////////////////////
@@ -1284,7 +1293,6 @@ void OpenGLRenderer::drawRegionRects(const Region& region) {
void OpenGLRenderer::drawRegionRects(const SkRegion& region, int color,
SkXfermode::Mode mode, bool dirty) {
int count = 0;
Vector<float> rects;
SkRegion::Iterator it(region);
@@ -1294,11 +1302,10 @@ void OpenGLRenderer::drawRegionRects(const SkRegion& region, int color,
rects.push(r.fTop);
rects.push(r.fRight);
rects.push(r.fBottom);
count += 4;
it.next();
}
drawColorRects(rects.array(), count, color, mode, true, dirty, false);
drawColorRects(rects.array(), rects.size(), color, mode, true, dirty, false);
}
void OpenGLRenderer::dirtyLayer(const float left, const float top,
@@ -1328,6 +1335,21 @@ void OpenGLRenderer::dirtyLayerUnchecked(Rect& bounds, Region* region) {
}
}
void OpenGLRenderer::drawIndexedQuads(Vertex* mesh, GLsizei quadsCount) {
GLsizei elementsCount = quadsCount * 6;
while (elementsCount > 0) {
GLsizei drawCount = min(elementsCount, (GLsizei) gMaxNumberOfQuads * 6);
setupDrawIndexedVertices(&mesh[0].position[0]);
glDrawElements(GL_TRIANGLES, drawCount, GL_UNSIGNED_SHORT, NULL);
elementsCount -= drawCount;
// Though there are 4 vertices in a quad, we use 6 indices per
// quad to draw with GL_TRIANGLES
mesh += (drawCount / 6) * 4;
}
}
void OpenGLRenderer::clearLayerRegions() {
const size_t count = mLayers.size();
if (count == 0) return;
@@ -1342,17 +1364,15 @@ void OpenGLRenderer::clearLayerRegions() {
// is likely different so we need to disable clipping here
bool scissorChanged = mCaches.disableScissor();
Vertex mesh[count * 6];
Vertex mesh[count * 4];
Vertex* vertex = mesh;
for (uint32_t i = 0; i < count; i++) {
Rect* bounds = mLayers.itemAt(i);
Vertex::set(vertex++, bounds->left, bounds->bottom);
Vertex::set(vertex++, bounds->left, bounds->top);
Vertex::set(vertex++, bounds->right, bounds->top);
Vertex::set(vertex++, bounds->left, bounds->bottom);
Vertex::set(vertex++, bounds->right, bounds->top);
Vertex::set(vertex++, bounds->right, bounds->bottom);
delete bounds;
@@ -1368,9 +1388,8 @@ void OpenGLRenderer::clearLayerRegions() {
setupDrawProgram();
setupDrawPureColorUniforms();
setupDrawModelViewTranslate(0.0f, 0.0f, 0.0f, 0.0f, true);
setupDrawVertices(&mesh[0].position[0]);
glDrawArrays(GL_TRIANGLES, 0, count * 6);
drawIndexedQuads(&mesh[0], count);
if (scissorChanged) mCaches.enableScissor();
} else {
@@ -1976,10 +1995,10 @@ void OpenGLRenderer::setupDrawMeshIndices(GLvoid* vertices, GLvoid* texCoords, G
}
}
void OpenGLRenderer::setupDrawVertices(GLvoid* vertices) {
void OpenGLRenderer::setupDrawIndexedVertices(GLvoid* vertices) {
bool force = mCaches.unbindMeshBuffer();
mCaches.bindIndicesBuffer();
mCaches.bindPositionVertexPointer(force, vertices, gVertexStride);
mCaches.unbindIndicesBuffer();
}
void OpenGLRenderer::finishDrawTexture() {
@@ -3139,11 +3158,22 @@ status_t OpenGLRenderer::drawLayer(Layer* layer, float x, float y) {
setupDrawModelViewTranslate(x, y,
x + layer->layer.getWidth(), y + layer->layer.getHeight());
}
setupDrawMesh(&layer->mesh[0].position[0], &layer->mesh[0].texture[0]);
DRAW_DOUBLE_STENCIL_IF(!layer->hasDrawnSinceUpdate,
glDrawElements(GL_TRIANGLES, layer->meshElementCount,
GL_UNSIGNED_SHORT, layer->meshIndices));
TextureVertex* mesh = &layer->mesh[0];
GLsizei elementsCount = layer->meshElementCount;
while (elementsCount > 0) {
GLsizei drawCount = min(elementsCount, (GLsizei) gMaxNumberOfQuads * 6);
setupDrawMeshIndices(&mesh[0].position[0], &mesh[0].texture[0]);
DRAW_DOUBLE_STENCIL_IF(!layer->hasDrawnSinceUpdate,
glDrawElements(GL_TRIANGLES, drawCount, GL_UNSIGNED_SHORT, NULL));
elementsCount -= drawCount;
// Though there are 4 vertices in a quad, we use 6 indices per
// quad to draw with GL_TRIANGLES
mesh += (drawCount / 6) * 4;
}
finishDrawTexture();
@@ -3361,8 +3391,7 @@ status_t OpenGLRenderer::drawColorRects(const float* rects, int count, int color
float right = FLT_MIN;
float bottom = FLT_MIN;
int vertexCount = 0;
Vertex mesh[count * 6];
Vertex mesh[count];
Vertex* vertex = mesh;
for (int index = 0; index < count; index += 4) {
@@ -3371,15 +3400,11 @@ status_t OpenGLRenderer::drawColorRects(const float* rects, int count, int color
float r = rects[index + 2];
float b = rects[index + 3];
Vertex::set(vertex++, l, b);
Vertex::set(vertex++, l, t);
Vertex::set(vertex++, r, t);
Vertex::set(vertex++, l, b);
Vertex::set(vertex++, r, t);
Vertex::set(vertex++, r, b);
vertexCount += 6;
left = fminf(left, l);
top = fminf(top, t);
right = fmaxf(right, r);
@@ -3402,13 +3427,12 @@ status_t OpenGLRenderer::drawColorRects(const float* rects, int count, int color
setupDrawColorUniforms();
setupDrawShaderUniforms();
setupDrawColorFilterUniforms();
setupDrawVertices((GLvoid*) &mesh[0].position[0]);
if (dirty && hasLayer()) {
dirtyLayer(left, top, right, bottom, currentTransform());
}
glDrawArrays(GL_TRIANGLES, 0, vertexCount);
drawIndexedQuads(&mesh[0], count / 4);
return DrawGlInfo::kStatusDrew;
}

9
libs/hwui/OpenGLRenderer.h
View File

@@ -849,6 +849,13 @@ private:
GLvoid* vertices, GLvoid* texCoords, GLenum drawMode, GLsizei elementsCount,
bool ignoreTransform, bool ignoreScale = false, bool dirty = true);
/**
* Draws the specified list of vertices as quads using indexed GL_TRIANGLES.
* If the number of vertices to draw exceeds the number of indices we have
* pre-allocated, this method will generate several glDrawElements() calls.
*/
void drawIndexedQuads(Vertex* mesh, GLsizei quadsCount);
/**
* Draws text underline and strike-through if needed.
*
@@ -988,7 +995,7 @@ private:
void setupDrawMesh(GLvoid* vertices, GLvoid* texCoords = NULL, GLuint vbo = 0);
void setupDrawMesh(GLvoid* vertices, GLvoid* texCoords, GLvoid* colors);
void setupDrawMeshIndices(GLvoid* vertices, GLvoid* texCoords, GLuint vbo = 0);
void setupDrawVertices(GLvoid* vertices);
void setupDrawIndexedVertices(GLvoid* vertices);
void finishDrawTexture();
void accountForClear(SkXfermode::Mode mode);