gpu: Render to a framebuffer object instead of an offscreen surface in gpu_perftests.

gpu/perftests/texture_upload_perftest.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <algorithm>
 #include <vector>
 
 #include "base/containers/small_map.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 78 matching lines @@
 // PerfTest to check costs of texture upload at different stages
 // on different platforms.
 class TextureUploadPerfTest : public testing::Test {
  public:
   TextureUploadPerfTest() : size_(512, 512) {}
 
   // Overridden from testing::Test
   void SetUp() override {
     // Initialize an offscreen surface and a gl context.
     gfx::GLSurface::InitializeOneOff();
-    surface_ = gfx::GLSurface::CreateOffscreenGLSurface(size_);
+    surface_ = gfx::GLSurface::CreateOffscreenGLSurface(gfx::Size(4, 4));
     gl_context_ = gfx::GLContext::CreateGLContext(NULL,  // share_group
                                                   surface_.get(),
                                                   gfx::PreferIntegratedGpu);
+    ui::ScopedMakeCurrent smc(gl_context_.get(), surface_.get());
+    glGenTextures(1, &color_texture_);
+    glBindTexture(GL_TEXTURE_2D, color_texture_);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, size_.width(), size_.height(), 0,
+                 GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
 
-    ui::ScopedMakeCurrent smc(gl_context_.get(), surface_.get());
+    glGenFramebuffersEXT(1, &framebuffer_object_);
+    glBindFramebufferEXT(GL_FRAMEBUFFER, framebuffer_object_);
+
+    glFramebufferTexture2DEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+                              GL_TEXTURE_2D, color_texture_, 0);
+    DCHECK_EQ(static_cast<GLenum>(GL_FRAMEBUFFER_COMPLETE),
+              glCheckFramebufferStatusEXT(GL_FRAMEBUFFER));
+
+    glViewport(0, 0, size_.width(), size_.height());
+
     if (gpu_timing_.Initialize(gl_context_.get())) {
       LOG(INFO) << "Gpu timing initialized with timer type: "
                 << gpu_timing_.GetTimerTypeName();
       gpu_timing_.CheckAndResetTimerErrors();
       gpu_timing_.InvalidateTimerOffset();
     } else {
       LOG(WARNING) << "Can't initialize gpu timing";
     }
-
     // Prepare a simple program and a vertex buffer that will be
     // used to draw a quad on the offscreen surface.
     vertex_shader_ = LoadShader(GL_VERTEX_SHADER, kVertexShader);
     fragment_shader_ = LoadShader(GL_FRAGMENT_SHADER, kFragmentShader);
     program_object_ = glCreateProgram();
     CHECK_NE(0u, program_object_);
 
     glAttachShader(program_object_, vertex_shader_);
     glAttachShader(program_object_, fragment_shader_);
     glBindAttribLocation(program_object_, 0, "a_position");
@@ skipping 11 matching lines @@
     glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer_);
     static GLfloat positions[] = {
         -1.0f, -1.0f, 1.0f, -1.0f, -1.0f, 1.0f, 1.0f, 1.0f,
     };
     glBufferData(GL_ARRAY_BUFFER, sizeof(positions), positions, GL_STATIC_DRAW);
     CheckNoGlError();
   }
 
   void TearDown() override {
     ui::ScopedMakeCurrent smc(gl_context_.get(), surface_.get());
-    if (program_object_ != 0) {
-      glDeleteProgram(program_object_);
-    }
-    if (vertex_shader_ != 0) {
-      glDeleteShader(vertex_shader_);
-    }
-    if (fragment_shader_ != 0) {
-      glDeleteShader(fragment_shader_);
-    }
-    if (vertex_buffer_ != 0) {
-      glDeleteShader(vertex_buffer_);
-    }
+    glDeleteProgram(program_object_);
+    glDeleteShader(vertex_shader_);
+    glDeleteShader(fragment_shader_);
+    glDeleteShader(vertex_buffer_);
+
+    glBindFramebufferEXT(GL_FRAMEBUFFER, 0);
+    glDeleteFramebuffersEXT(1, &framebuffer_object_);
+    glDeleteTextures(1, &color_texture_);
 
     gl_context_ = nullptr;
     surface_ = nullptr;
   }
 
  protected:
   // Upload and draw on the offscren surface.
   // Return a list of pair. Each pair describe a gl operation and the wall
   // time elapsed in milliseconds.
   std::vector<Measurement> UploadAndDraw(const std::vector<uint8>& pixels,
                                          const GLenum format,
                                          const GLenum type) {
     ui::ScopedMakeCurrent smc(gl_context_.get(), surface_.get());
+    DCHECK_NE(0u, framebuffer_object_);
+    glBindFramebufferEXT(GL_FRAMEBUFFER, framebuffer_object_);
 
     MeasurementTimers total_timers(&gpu_timing_);
     GLuint texture_id = 0;
 
     MeasurementTimers tex_timers(&gpu_timing_);
     glActiveTexture(GL_TEXTURE0);
     glGenTextures(1, &texture_id);
     glBindTexture(GL_TEXTURE_2D, texture_id);
 
     glTexImage2D(GL_TEXTURE_2D, 0, format, size_.width(), size_.height(), 0,
                  format, type, &pixels[0]);
-    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
     CheckNoGlError();
     tex_timers.Record();
 
     MeasurementTimers draw_timers(&gpu_timing_);
     glUseProgram(program_object_);
     glUniform1i(sampler_location_, 0);
 
     glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer_);
@@ skipping 22 matching lines @@
     EXPECT_EQ(pixels, pixels_rendered);
 
     std::vector<Measurement> measurements;
     measurements.push_back(total_timers.GetAsMeasurement("total"));
     measurements.push_back(tex_timers.GetAsMeasurement("teximage2d"));
     measurements.push_back(draw_timers.GetAsMeasurement("drawarrays"));
     measurements.push_back(finish_timers.GetAsMeasurement("finish"));
     return measurements;
   }
 
-  const gfx::Size size_;  // for the offscreen surface and the texture
+  const gfx::Size size_;  // for the fbo and the texture
   scoped_refptr<gfx::GLContext> gl_context_;
   scoped_refptr<gfx::GLSurface> surface_;
   GPUTiming gpu_timing_;
 
+  GLuint color_texture_ = 0;
+  GLuint framebuffer_object_ = 0;
   GLuint vertex_shader_ = 0;
   GLuint fragment_shader_ = 0;
   GLuint program_object_ = 0;
   GLint sampler_location_ = -1;
   GLuint vertex_buffer_ = 0;
 };
 
 // Perf test that generates, uploads and draws a texture on a surface repeatedly
 // and prints out aggregated measurements for all the runs.
 TEST_F(TextureUploadPerfTest, glTexImage2d) {
@@ skipping 13 matching lines @@
   }
 
   for (const auto& entry : aggregates) {
     const auto m = entry.second.Divide(kUploadPerfTestRuns);
     m.PrintResult();
   }
 }
 
 }  // namespace
 }  // namespace gpu