Cache BlitGL initialization state with a single bool.

src/libANGLE/renderer/gl/BlitGL.cpp

@@ -1109,21 +1109,18 @@ angle::Result BlitGL::generateSRGBMipmap(const gl::Context *context,
 
 angle::Result BlitGL::initializeResources(const gl::Context *context)
 {
-    for (size_t i = 0; i < ArraySize(mScratchTextures); i++)
+    if (mResourcesInitialized)
     {
-        if (mScratchTextures[i] == 0)
+        return angle::Result::Continue;
+    }
+
+    for (size_t i = 0; i < ArraySize(mScratchTextures); i++)
     {
         ANGLE_GL_TRY(context, mFunctions->genTextures(1, &mScratchTextures[i]));
     }
-    }
 
-    if (mScratchFBO == 0)
-    {
     ANGLE_GL_TRY(context, mFunctions->genFramebuffers(1, &mScratchFBO));
-    }
 
-    if (mVertexBuffer == 0)
-    {
     ANGLE_GL_TRY(context, mFunctions->genBuffers(1, &mVertexBuffer));
     mStateManager->bindBuffer(gl::BufferBinding::Array, mVertexBuffer);
 
@@ -1135,10 +1132,7 @@ angle::Result BlitGL::initializeResources(const gl::Context *context)
 
     ANGLE_GL_TRY(context, mFunctions->bufferData(GL_ARRAY_BUFFER, sizeof(float) * 6, vertexData,
                                                  GL_STATIC_DRAW));
-    }
 
-    if (mVAO == 0)
-    {
     ANGLE_GL_TRY(context, mFunctions->genVertexArrays(1, &mVAO));
 
     mStateManager->bindVertexArray(mVAO, 0);
@@ -1155,7 +1149,6 @@ angle::Result BlitGL::initializeResources(const gl::Context *context)
         ANGLE_GL_TRY(context,
                      mFunctions->vertexAttribPointer(i, 2, GL_FLOAT, GL_FALSE, 0, nullptr));
     }
-    }
 
     constexpr GLenum potentialSRGBMipmapGenerationFormats[] = {
         GL_RGBA16, GL_RGBA16F, GL_RGBA32F,
@@ -1178,6 +1171,7 @@ angle::Result BlitGL::initializeResources(const gl::Context *context)
     }
     ASSERT(mSRGBMipmapGenerationFormat.internalFormat != GL_NONE);
 
+    mResourcesInitialized = true;
     return angle::Result::Continue;
 }
 

src/libANGLE/renderer/gl/BlitGL.h

@@ -189,6 +189,8 @@ class BlitGL : angle::NonCopyable
                                  GLenum destComponentType,
                                  BlitProgram **program);
 
+    bool mResourcesInitialized = false;
+
     // SourceType, SourceComponentType, DestComponentType
     using BlitProgramType = std::tuple<gl::TextureType, GLenum, GLenum>;
     std::map<BlitProgramType, BlitProgram> mBlitPrograms;