Foundation for tiling optimization

Change-Id: I4db32a4749f196472ba0dde7e102439d2ba4a3a7

Author: Romain Guy

libs/hwui/Caches.cpp

@@ -321,6 +321,10 @@ bool Caches::unbindIndicesBuffer() {
     return false;
 }
 
+///////////////////////////////////////////////////////////////////////////////
+// Meshes and textures
+///////////////////////////////////////////////////////////////////////////////
+
 void Caches::bindPositionVertexPointer(bool force, GLuint slot, GLvoid* vertices, GLsizei stride) {
     if (force || vertices != mCurrentPositionPointer) {
         glVertexAttribPointer(slot, 2, GL_FLOAT, GL_FALSE, stride, vertices);
@@ -366,6 +370,10 @@ void Caches::activeTexture(GLuint textureUnit) {
     }
 }
 
+///////////////////////////////////////////////////////////////////////////////
+// Scissor
+///////////////////////////////////////////////////////////////////////////////
+
 bool Caches::setScissor(GLint x, GLint y, GLint width, GLint height) {
     if (scissorEnabled && (x != mScissorX || y != mScissorY ||
             width != mScissorWidth || height != mScissorHeight)) {
@@ -412,6 +420,26 @@ void Caches::resetScissor() {
     mScissorX = mScissorY = mScissorWidth = mScissorHeight = 0;
 }
 
+///////////////////////////////////////////////////////////////////////////////
+// Tiling
+///////////////////////////////////////////////////////////////////////////////
+
+void Caches::startTiling(GLuint x, GLuint y, GLuint width, GLuint height, bool opaque) {
+    if (extensions.hasTiledRendering()) {
+
+    }
+}
+
+void Caches::endTiling() {
+    if (extensions.hasTiledRendering()) {
+
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// Regions
+///////////////////////////////////////////////////////////////////////////////
+
 TextureVertex* Caches::getRegionMesh() {
     // Create the mesh, 2 triangles and 4 vertices per rectangle in the region
     if (!mRegionMesh) {

libs/hwui/Caches.h

@@ -211,6 +211,9 @@ class ANDROID_API Caches: public Singleton<Caches> {
     bool disableScissor();
     void setScissorEnabled(bool enabled);
 
+    void startTiling(GLuint x, GLuint y, GLuint width, GLuint height, bool opaque);
+    void endTiling();
+
     /**
      * Returns the mesh used to draw regions. Calling this method will
      * bind a VBO of type GL_ELEMENT_ARRAY_BUFFER that contains the

libs/hwui/Extensions.h

@@ -65,18 +65,21 @@ class Extensions {
         mHasDiscardFramebuffer = hasExtension("GL_EXT_discard_framebuffer");
         mHasDebugMarker = hasExtension("GL_EXT_debug_marker");
         mHasDebugLabel = hasExtension("GL_EXT_debug_label");
+        mHasTiledRendering = hasExtension("GL_QCOM_tiled_rendering");
 
-        // We don't need to copy the string, the OpenGL ES spec
-        // guarantees the result of glGetString to point to a
-        // static string as long as our OpenGL context is valid
-        mExtensions = buffer;
+        mExtensions = strdup(buffer);
+    }
+
+    ~Extensions() {
+        free(mExtensions);
     }
 
     inline bool hasNPot() const { return mHasNPot; }
     inline bool hasFramebufferFetch() const { return mHasFramebufferFetch; }
     inline bool hasDiscardFramebuffer() const { return mHasDiscardFramebuffer; }
     inline bool hasDebugMarker() const { return mHasDebugMarker; }
     inline bool hasDebugLabel() const { return mHasDebugLabel; }
+    inline bool hasTiledRendering() const { return mHasTiledRendering; }
 
     bool hasExtension(const char* extension) const {
         const String8 s(extension);
@@ -90,13 +93,14 @@ class Extensions {
 private:
     SortedVector<String8> mExtensionList;
 
-    const char* mExtensions;
+    char* mExtensions;
 
     bool mHasNPot;
     bool mHasFramebufferFetch;
     bool mHasDiscardFramebuffer;
     bool mHasDebugMarker;
     bool mHasDebugLabel;
+    bool mHasTiledRendering;
 }; // class Extensions
 
 }; // namespace uirenderer