src/gpu/command_buffer/tests/gl_chromium_framebuffer_multisample_unittest.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include <GLES2/gl2.h>
   6 #include <GLES2/gl2ext.h>
   7 #include <GLES2/gl2extchromium.h>
   8
   9 #include "gpu/command_buffer/tests/gl_manager.h"
  10 #include "gpu/command_buffer/tests/gl_test_utils.h"
  11 #include "testing/gmock/include/gmock/gmock.h"
  12 #include "testing/gtest/include/gtest/gtest.h"
  13
  14 namespace gpu {
  15
  16 class GLChromiumFramebufferMultisampleTest : public testing::Test {
  17  protected:
  18   virtual void SetUp() {
  19     gl_.Initialize(GLManager::Options());
  20   }
  21
  22   virtual void TearDown() {
  23     gl_.Destroy();
  24   }
  25
  26   GLManager gl_;
  27 };
  28
  29 // Test that GL is at least minimally working.
  30 TEST_F(GLChromiumFramebufferMultisampleTest, CachedBindingsTest) {
  31   if (!GLTestHelper::HasExtension("GL_CHROMIUM_framebuffer_multisample")) {
  32     return;
  33   }
  34
  35   GLuint fbo = 0;
  36   glGenFramebuffers(1, &fbo);
  37   glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
  38   glBindFramebuffer(GL_FRAMEBUFFER, 0);
  39
  40   // If the caching is bad the second call to glBindFramebuffer will do nothing.
  41   // which means the draw buffer is bad and will not return
  42   // GL_FRAMEBUFFER_COMPLETE and rendering will generate an error.
  43   EXPECT_EQ(static_cast<GLenum>(GL_FRAMEBUFFER_COMPLETE),
  44             glCheckFramebufferStatus(GL_FRAMEBUFFER));
  45
  46   glClear(GL_COLOR_BUFFER_BIT);
  47   GLTestHelper::CheckGLError("no errors", __LINE__);
  48 }
  49
  50 TEST_F(GLChromiumFramebufferMultisampleTest, DrawAndResolve) {
  51   if (!GLTestHelper::HasExtension("GL_CHROMIUM_framebuffer_multisample")) {
  52     return;
  53   }
  54
  55   static const char* v_shader_str =
  56       "attribute vec4 a_Position;\n"
  57       "void main()\n"
  58       "{\n"
  59       "   gl_Position = a_Position;\n"
  60       "}\n";
  61   static const char* f_shader_str =
  62       "precision mediump float;\n"
  63       "void main()\n"
  64       "{\n"
  65       "  gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);\n"
  66       "}\n";
  67
  68   GLuint program = GLTestHelper::LoadProgram(v_shader_str, f_shader_str);
  69   glUseProgram(program);
  70   GLuint position_loc = glGetAttribLocation(program, "a_Position");
  71
  72   GLTestHelper::SetupUnitQuad(position_loc);
  73
  74   const GLuint width = 100;
  75   const GLuint height = 100;
  76
  77   // Create a sample buffer.
  78   GLsizei num_samples = 4, max_samples = 0;
  79   glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
  80   num_samples = std::min(num_samples, max_samples);
  81
  82   GLuint sample_fbo, sample_rb;
  83   glGenRenderbuffers(1, &sample_rb);
  84   glBindRenderbuffer(GL_RENDERBUFFER, sample_rb);
  85   glRenderbufferStorageMultisampleEXT(
  86       GL_RENDERBUFFER, num_samples, GL_RGBA8_OES, width, height);
  87   GLint param = 0;
  88   glGetRenderbufferParameteriv(
  89       GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &param);
  90   EXPECT_GE(param, num_samples);
  91
  92   glGenFramebuffers(1, &sample_fbo);
  93   glBindFramebuffer(GL_FRAMEBUFFER, sample_fbo);
  94   glFramebufferRenderbuffer(GL_FRAMEBUFFER,
  95                             GL_COLOR_ATTACHMENT0,
  96                             GL_RENDERBUFFER,
  97                             sample_rb);
  98   EXPECT_EQ(static_cast<GLenum>(GL_FRAMEBUFFER_COMPLETE),
  99             glCheckFramebufferStatus(GL_FRAMEBUFFER));
 100
 101   // Create another FBO to resolve the multisample buffer into.
 102   GLuint resolve_fbo, resolve_tex;
 103   glGenTextures(1, &resolve_tex);
 104   glBindTexture(GL_TEXTURE_2D, resolve_tex);
 105   glTexImage2D(GL_TEXTURE_2D,
 106                0,
 107                GL_RGBA,
 108                width,
 109                height,
 110                0,
 111                GL_RGBA,
 112                GL_UNSIGNED_BYTE,
 113                NULL);
 114   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 115   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 116   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 117   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 118   glGenFramebuffers(1, &resolve_fbo);
 119   glBindFramebuffer(GL_FRAMEBUFFER, resolve_fbo);
 120   glFramebufferTexture2D(GL_FRAMEBUFFER,
 121                          GL_COLOR_ATTACHMENT0,
 122                          GL_TEXTURE_2D,
 123                          resolve_tex,
 124                          0);
 125   EXPECT_EQ(static_cast<GLenum>(GL_FRAMEBUFFER_COMPLETE),
 126             glCheckFramebufferStatus(GL_FRAMEBUFFER));
 127
 128   // Draw one triangle (bottom left half).
 129   glViewport(0, 0, width, height);
 130   glBindFramebuffer(GL_FRAMEBUFFER, sample_fbo);
 131   glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
 132   glClear(GL_COLOR_BUFFER_BIT);
 133   glDrawArrays(GL_TRIANGLES, 0, 3);
 134
 135   // Resolve.
 136   glBindFramebuffer(GL_READ_FRAMEBUFFER, sample_fbo);
 137   glBindFramebuffer(GL_DRAW_FRAMEBUFFER, resolve_fbo);
 138   glClearColor(1.0f, 0.0f, 0.0f, 0.0f);
 139   glClear(GL_COLOR_BUFFER_BIT);
 140   glBlitFramebufferEXT(0,
 141                        0,
 142                        width,
 143                        height,
 144                        0,
 145                        0,
 146                        width,
 147                        height,
 148                        GL_COLOR_BUFFER_BIT,
 149                        GL_NEAREST);
 150
 151   // Verify.
 152   const uint8 green[] = {0, 255, 0, 255};
 153   const uint8 black[] = {0, 0, 0, 0};
 154   glBindFramebuffer(GL_READ_FRAMEBUFFER, resolve_fbo);
 155   EXPECT_TRUE(
 156       GLTestHelper::CheckPixels(width / 4, (3 * height) / 4, 1, 1, 0, green));
 157   EXPECT_TRUE(GLTestHelper::CheckPixels(width - 1, 0, 1, 1, 0, black));
 158 }
 159
 160 }  // namespace gpu
 161