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      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   glRenderbufferStorageMultisampleCHROMIUM(
     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   glBlitFramebufferCHROMIUM(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 
    162