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