Split tests into individual files. Got rid of globals by converting them to classes.

client/deps/glbench/src/windowmanagercompositingtest.cc

+// Copyright (c) 2010 The Chromium OS 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 <stdio.h>
+
+#include "main.h"
+#include "testbase.h"
+#include "utils.h"
+
+
+namespace glbench {
+
+const float kScreenScaleFactor = 1e6f * (WINDOW_WIDTH * WINDOW_HEIGHT) /
+    (1280.f * 768);
+
+class WindowManagerCompositingTest : public TestBase {
+ public:
+  WindowManagerCompositingTest(bool scissor)
+      : scissor_(scissor),
+      compositing_background_program_(0),
+      compositing_foreground_program_(0) {}
+  virtual ~WindowManagerCompositingTest() {}
+  virtual bool TestFunc(int iter);
+  virtual bool Run();
+
+  void InitializeCompositing();
+  void TeardownCompositing();
+  void InitBaseTexture();
+  void UpdateTexture();
+  void LoadTexture();
+
+ private:
+  bool scissor_;
+  uint32_t texture_base_[WINDOW_HEIGHT*WINDOW_WIDTH];
+  uint32_t texture_update_[WINDOW_HEIGHT*WINDOW_WIDTH];
+#ifndef USE_EGL
+  GLuint compositing_textures_[5];
+  GLuint compositing_background_program_;
+  GLuint compositing_foreground_program_;
+#endif
+  DISALLOW_COPY_AND_ASSIGN(WindowManagerCompositingTest);
+};
+
+TestBase* GetWindowManagerCompositingTest(bool enable_scissor) {
+  return new WindowManagerCompositingTest(enable_scissor);
+}
+
+bool WindowManagerCompositingTest::Run() {
+  const char* testname = "1280x768_fps_compositing";
+  if (scissor_) {
+    glScissor(0, 0, 1, 1);
+    glEnable(GL_SCISSOR_TEST);
+    testname = "1280x768_fps_no_fill_compositing";
+  }
+  InitializeCompositing();
+  RunTest(this, testname, kScreenScaleFactor, true);
+  TeardownCompositing();
+  return true;
+}
+
+bool WindowManagerCompositingTest::TestFunc(int iter) {
+  for (int i = 0 ; i < iter; ++i) {
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    // Draw the background
+    glDisable(GL_BLEND);
+    glDisable(GL_DEPTH_TEST);
+    // We have to blend three textures, but we use multi-texture for this
+    // blending, not fb blend, to avoid the external memory traffic
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, compositing_textures_[0]);
+    glActiveTexture(GL_TEXTURE1);
+    glBindTexture(GL_TEXTURE_2D, compositing_textures_[1]);
+    glActiveTexture(GL_TEXTURE2);
+    glBindTexture(GL_TEXTURE_2D, compositing_textures_[2]);
+    // Set up the texture coordinate arrays
+    glClientActiveTexture(GL_TEXTURE0);
+    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+    glClientActiveTexture(GL_TEXTURE1);
+    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+    glClientActiveTexture(GL_TEXTURE2);
+    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+    // Use the right shader
+    glUseProgram(compositing_background_program_);
+    // Draw the quad
+    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+
+    // Set up one texture coordinate array
+    glClientActiveTexture(GL_TEXTURE0);
+    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+    glClientActiveTexture(GL_TEXTURE1);
+    glDisableClientState(GL_TEXTURE_COORD_ARRAY);
+    glClientActiveTexture(GL_TEXTURE2);
+    glDisableClientState(GL_TEXTURE_COORD_ARRAY);
+    // Use the right shader
+    glUseProgram(compositing_foreground_program_);
+
+    // Compositing is blending, so we shall blend.
+    glEnable(GL_BLEND);
+    // Depth test is on for window occlusion
+    glEnable(GL_DEPTH_TEST);
+
+    // Draw window number one
+    // This update acts like a chrome webkit sw rendering update.
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, compositing_textures_[3]);
+    UpdateTexture();
+    // TODO(papakipos): this LoadTexture is likely doing more CPU memory copies
+    // than we would like.
+    LoadTexture();
+    // TODO(papakipos): add color interpolation here, and modulate
+    // texture against it.
+    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+
+    // Draw window number two
+    // This is a static window, so we don't update it.
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, compositing_textures_[4]);
+    // TODO(papakipos): add color interpolation here, and modulate
+    // texture against it.
+    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+  }
+  return true;
+}
+
+#if I915_WORKAROUND
+#define V1 "gl_TexCoord[0]"
+#define V2 "gl_TexCoord[1]"
+#define V3 "gl_TexCoord[2]"
+#else
+#define V1 "v1"
+#define V2 "v2"
+#define V3 "v3"
+#endif
+
+const char *kBasicTextureVertexShader =
+    "attribute vec4 c1;"
+    "attribute vec4 c2;"
+    "varying vec2 v1;"
+    "void main() {"
+    "    gl_Position = c1;"
+    "    " V1 " = c2;"
+    "}";
+
+const char *kBasicTextureFragmentShader =
+    "uniform sampler2D texture_sampler;"
+    "varying vec2 v1;"
+    "void main() {"
+    "    gl_FragColor = texture2D(texture_sampler, " V1 ".xy);"
+    "}";
+
+GLuint BasicTextureShaderProgram(GLuint vertex_buffer, GLuint texture_buffer) {
+  GLuint program = InitShaderProgram(kBasicTextureVertexShader,
+                                     kBasicTextureFragmentShader);
+
+  // Set up the texture sampler
+  int textureSampler = glGetUniformLocation(program, "texture_sampler");
+  glUniform1i(textureSampler, 0);
+
+  // Set up vertex attribute
+  int attribute_index = glGetAttribLocation(program, "c1");
+  glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer);
+  glVertexAttribPointer(attribute_index, 2, GL_FLOAT, GL_FALSE, 0, NULL);
+  glEnableVertexAttribArray(attribute_index);
+
+  // Set up texture attribute
+  attribute_index = glGetAttribLocation(program, "c2");
+  glBindBuffer(GL_ARRAY_BUFFER, texture_buffer);
+  glVertexAttribPointer(attribute_index, 2, GL_FLOAT, GL_FALSE, 0, NULL);
+  glEnableVertexAttribArray(attribute_index);
+
+  return program;
+}
+
+const char *kDoubleTextureBlendVertexShader =
+    "attribute vec4 c1;"
+    "attribute vec4 c2;"
+    "attribute vec4 c3;"
+    "varying vec2 v1;"
+    "varying vec2 v2;"
+    "void main() {"
+    "    gl_Position = c1;"
+    "    " V1 " = c2;"
+    "    " V2 " = c3;"
+    "}";
+
+const char *kDoubleTextureBlendFragmentShader =
+    "uniform sampler2D texture_sampler_0;"
+    "uniform sampler2D texture_sampler_1;"
+    "varying vec2 v1;"
+    "varying vec2 v2;"
+    "void main() {"
+    "    vec4 one = texture2D(texture_sampler_0, " V1 ".xy);"
+    "    vec4 two = texture2D(texture_sampler_1, " V2 ".xy);"
+    "    gl_FragColor = mix(one, two, 0.5);"
+    "}";
+
+// This shader blends the three textures
+GLuint DoubleTextureBlendShaderProgram(GLuint vertex_buffer,
+                                       GLuint texture_buffer_0,
+                                       GLuint texture_buffer_1) {
+  GLuint program = InitShaderProgram(kDoubleTextureBlendVertexShader,
+                                     kDoubleTextureBlendFragmentShader);
+  // Set up the texture sampler
+  int textureSampler0 = glGetUniformLocation(program, "texture_sampler_0");
+  glUniform1i(textureSampler0, 0);
+  int textureSampler1 = glGetUniformLocation(program, "texture_sampler_1");
+  glUniform1i(textureSampler1, 1);
+
+  // Set up vertex attribute
+  int attribute_index = glGetAttribLocation(program, "c1");
+  glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer);
+  glVertexAttribPointer(attribute_index, 2, GL_FLOAT, GL_FALSE, 0, NULL);
+  glEnableVertexAttribArray(attribute_index);
+
+  // Set up texture attributes
+  attribute_index = glGetAttribLocation(program, "c2");
+  glBindBuffer(GL_ARRAY_BUFFER, texture_buffer_0);
+  glVertexAttribPointer(attribute_index, 2, GL_FLOAT, GL_FALSE, 0, NULL);
+  glEnableVertexAttribArray(attribute_index);
+
+  attribute_index = glGetAttribLocation(program, "c3");
+  glBindBuffer(GL_ARRAY_BUFFER, texture_buffer_1);
+  glVertexAttribPointer(attribute_index, 2, GL_FLOAT, GL_FALSE, 0, NULL);
+  glEnableVertexAttribArray(attribute_index);
+
+  return program;
+}
+
+const char *triple_texture_blend_vertex_shader =
+"attribute vec4 c1;"
+"attribute vec4 c2;"
+"attribute vec4 c3;"
+"attribute vec4 c4;"
+"varying vec2 v1;"
+"varying vec2 v2;"
+"varying vec2 v3;"
+"void main() {"
+"    gl_Position = c1;"
+"    " V1 " = c2;"
+"    " V2 " = c3;"
+"    " V3 " = c4;"
+"}";
+
+const char *triple_texture_blend_fragment_shader =
+"uniform sampler2D texture_sampler_0;"
+"uniform sampler2D texture_sampler_1;"
+"uniform sampler2D texture_sampler_2;"
+"varying vec2 v1;"
+"varying vec2 v2;"
+"varying vec2 v3;"
+"void main() {"
+"    vec4 one = texture2D(texture_sampler_0, " V1 ".xy);"
+"    vec4 two = texture2D(texture_sampler_1, " V2 ".xy);"
+"    vec4 three = texture2D(texture_sampler_2, " V3 ".xy);"
+"    gl_FragColor = mix(mix(one, two, 0.5), three, 0.5);"
+"}";
+
+// This shader blends the three textures
+GLuint TripleTextureBlendShaderProgram(GLuint vertex_buffer,
+                                              GLuint texture_buffer_0,
+                                              GLuint texture_buffer_1,
+                                              GLuint texture_buffer_2) {
+  GLuint program =
+    InitShaderProgram(triple_texture_blend_vertex_shader,
+                      triple_texture_blend_fragment_shader);
+
+  // Set up the texture sampler
+  int textureSampler0 = glGetUniformLocation(program, "texture_sampler_0");
+  glUniform1i(textureSampler0, 0);
+  int textureSampler1 = glGetUniformLocation(program, "texture_sampler_1");
+  glUniform1i(textureSampler1, 1);
+  int textureSampler2 = glGetUniformLocation(program, "texture_sampler_2");
+  glUniform1i(textureSampler2, 2);
+
+  // Set up vertex attribute
+  int attribute_index = glGetAttribLocation(program, "c1");
+  glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer);
+  glVertexAttribPointer(attribute_index, 2, GL_FLOAT, GL_FALSE, 0, NULL);
+  glEnableVertexAttribArray(attribute_index);
+
+  // Set up texture attributes
+  attribute_index = glGetAttribLocation(program, "c2");
+  glBindBuffer(GL_ARRAY_BUFFER, texture_buffer_0);
+  glVertexAttribPointer(attribute_index, 2, GL_FLOAT, GL_FALSE, 0, NULL);
+  glEnableVertexAttribArray(attribute_index);
+
+  attribute_index = glGetAttribLocation(program, "c3");
+  glBindBuffer(GL_ARRAY_BUFFER, texture_buffer_1);
+  glVertexAttribPointer(attribute_index, 2, GL_FLOAT, GL_FALSE, 0, NULL);
+  glEnableVertexAttribArray(attribute_index);
+
+  attribute_index = glGetAttribLocation(program, "c4");
+  glBindBuffer(GL_ARRAY_BUFFER, texture_buffer_2);
+  glVertexAttribPointer(attribute_index, 2, GL_FLOAT, GL_FALSE, 0, NULL);
+  glEnableVertexAttribArray(attribute_index);
+
+  return program;
+}
+
+#undef V1
+#undef V2
+#undef V3
+
+void WindowManagerCompositingTest::InitializeCompositing() {
+  InitBaseTexture();
+
+  glClearColor(0.f, 0.f, 0.f, 0.f);
+  glDisable(GL_DEPTH_TEST);
+  glDisable(GL_BLEND);
+  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+  glDepthFunc(GL_LEQUAL);
+
+  glGenTextures(5, compositing_textures_);
+  glActiveTexture(GL_TEXTURE0);
+  for (int i = 0; i < 5; i++) {
+    glBindTexture(GL_TEXTURE_2D, compositing_textures_[i]);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
+                    GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,
+                    GL_LINEAR);
+  }
+
+  glColor4f(1.f, 1.f, 1.f, 1.f);
+
+  // Set up the vertex arrays for drawing textured quads later on.
+  glEnableClientState(GL_VERTEX_ARRAY);
+  GLfloat buffer_vertex[8] = {
+    -1.f, -1.f,
+    1.f,  -1.f,
+    -1.f, 1.f,
+    1.f,  1.f,
+  };
+  GLuint vbo_vertex = SetupVBO(GL_ARRAY_BUFFER,
+                               sizeof(buffer_vertex), buffer_vertex);
+  glVertexPointer(2, GL_FLOAT, 0, 0);
+
+  GLfloat buffer_texture[8] = {
+    0.f, 0.f,
+    1.f, 0.f,
+    0.f, 1.f,
+    1.f, 1.f,
+  };
+  GLuint vbo_texture = SetupVBO(GL_ARRAY_BUFFER,
+                                sizeof(buffer_texture), buffer_texture);
+  for (int i = 0; i < 3; i++) {
+    glClientActiveTexture(GL_TEXTURE0 + i);
+    glTexCoordPointer(2, GL_FLOAT, 0, 0);
+    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+  }
+
+  // Set up the static background textures.
+  UpdateTexture();
+  UpdateTexture();
+  UpdateTexture();
+  // Load these textures into bound texture ids and keep using them
+  // from there to avoid having to reload this texture every frame
+  glActiveTexture(GL_TEXTURE0);
+  glBindTexture(GL_TEXTURE_2D, compositing_textures_[0]);
+  LoadTexture();
+  glActiveTexture(GL_TEXTURE1);
+  glBindTexture(GL_TEXTURE_2D, compositing_textures_[1]);
+  LoadTexture();
+  glActiveTexture(GL_TEXTURE2);
+  glBindTexture(GL_TEXTURE_2D, compositing_textures_[2]);
+  LoadTexture();
+
+  glActiveTexture(GL_TEXTURE0);
+  glBindTexture(GL_TEXTURE_2D, compositing_textures_[3]);
+  UpdateTexture();
+  LoadTexture();
+
+  glActiveTexture(GL_TEXTURE0);
+  glBindTexture(GL_TEXTURE_2D, compositing_textures_[4]);
+  UpdateTexture();
+  LoadTexture();
+
+  // Set up vertex & fragment shaders.
+  compositing_background_program_ =
+      TripleTextureBlendShaderProgram(vbo_vertex,
+                                      vbo_texture, vbo_texture, vbo_texture);
+  compositing_foreground_program_ =
+      BasicTextureShaderProgram(vbo_vertex, vbo_texture);
+  if (!compositing_background_program_ || !compositing_foreground_program_) {
+    printf("# Could not set up compositing shader.\n");
+  }
+
+  glVertexPointer(2, GL_FLOAT, 0, 0);
+}
+
+void WindowManagerCompositingTest::TeardownCompositing() {
+  glDeleteProgram(compositing_background_program_);
+  glDeleteProgram(compositing_foreground_program_);
+}
+
+void WindowManagerCompositingTest::InitBaseTexture() {
+  for (int y = 0; y < WINDOW_HEIGHT; y++) {
+    for (int x = 0; x < WINDOW_WIDTH; x++) {
+      // This color is gray, half alpha.
+      texture_base_[y*WINDOW_WIDTH+x] = 0x80808080;
+    }
+  }
+}
+
+// UpdateTexture simulates Chrome updating tab contents.
+// We cause a bunch of read and write cpu memory bandwidth.
+// It's a very rough approximation.
+void WindowManagerCompositingTest::UpdateTexture() {
+  memcpy(texture_update_, texture_base_, sizeof(texture_base_));
+}
+
+void WindowManagerCompositingTest::LoadTexture() {
+  // Use GL_RGBA for compatibility with GLES2.0.
+  glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
+               WINDOW_WIDTH, WINDOW_HEIGHT, 0,
+               GL_RGBA, GL_UNSIGNED_BYTE, texture_update_);
+}
+
+} // namespace glbench