gpu/command_buffer/tests/gl_depth_texture_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
   8 #include "gpu/command_buffer/tests/gl_manager.h"
   9 #include "gpu/command_buffer/tests/gl_test_utils.h"
  10 #include "testing/gmock/include/gmock/gmock.h"
  11 #include "testing/gtest/include/gtest/gtest.h"
  12
  13 #define SHADER(Src) #Src
  14
  15 namespace gpu {
  16
  17 class DepthTextureTest : public testing::Test {
  18  protected:
  19   static const GLsizei kResolution = 64;
  20   void SetUp() override {
  21     GLManager::Options options;
  22     options.size = gfx::Size(kResolution, kResolution);
  23     gl_.Initialize(options);
  24   }
  25
  26   void TearDown() override { gl_.Destroy(); }
  27
  28   GLuint SetupUnitQuad(GLint position_location);
  29
  30   GLManager gl_;
  31 };
  32
  33 GLuint DepthTextureTest::SetupUnitQuad(GLint position_location) {
  34   GLuint vbo = 0;
  35   glGenBuffers(1, &vbo);
  36   glBindBuffer(GL_ARRAY_BUFFER, vbo);
  37   static float vertices[] = {
  38       1.0f,  1.0f,  1.0f,
  39      -1.0f,  1.0f,  0.0f,
  40      -1.0f, -1.0f, -1.0f,
  41       1.0f,  1.0f,  1.0f,
  42      -1.0f, -1.0f, -1.0f,
  43       1.0f, -1.0f,  0.0f,
  44   };
  45   glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
  46   glEnableVertexAttribArray(position_location);
  47   glVertexAttribPointer(position_location, 3, GL_FLOAT, GL_FALSE, 0, 0);
  48
  49   return vbo;
  50 }
  51
  52 namespace {
  53
  54 struct FormatType {
  55   GLenum format;
  56   GLenum type;
  57 };
  58
  59 }  // anonymous namespace
  60
  61 TEST_F(DepthTextureTest, RenderTo) {
  62   if (!GLTestHelper::HasExtension("GL_CHROMIUM_depth_texture")) {
  63     return;
  64   }
  65
  66   bool have_depth_stencil = GLTestHelper::HasExtension(
  67       "GL_OES_packed_depth_stencil");
  68
  69   static const char* v_shader_str = SHADER(
  70       attribute vec4 v_position;
  71       void main()
  72       {
  73          gl_Position = v_position;
  74       }
  75   );
  76   static const char* f_shader_str = SHADER(
  77       precision mediump float;
  78       uniform sampler2D u_texture;
  79       uniform vec2 u_resolution;
  80       void main()
  81       {
  82         vec2 texcoord = gl_FragCoord.xy / u_resolution;
  83         gl_FragColor = texture2D(u_texture, texcoord);
  84       }
  85   );
  86
  87   GLuint program = GLTestHelper::LoadProgram(v_shader_str, f_shader_str);
  88
  89   GLint position_loc = glGetAttribLocation(program, "v_position");
  90   GLint resolution_loc = glGetUniformLocation(program, "u_resolution");
  91
  92   SetupUnitQuad(position_loc);
  93
  94   // Depth test needs to be on for the depth buffer to be updated.
  95   glEnable(GL_DEPTH_TEST);
  96
  97   // create an fbo
  98   GLuint fbo = 0;
  99   glGenFramebuffers(1, &fbo);
 100   glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 101
 102   // create a depth texture.
 103   GLuint color_texture = 0;
 104   GLuint depth_texture = 0;
 105
 106   glGenTextures(1, &color_texture);
 107   glBindTexture(GL_TEXTURE_2D, color_texture);
 108   glTexImage2D(
 109       GL_TEXTURE_2D, 0, GL_RGBA, kResolution, kResolution,
 110       0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
 111   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 112   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 113   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 114   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 115   glFramebufferTexture2D(
 116       GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, color_texture, 0);
 117
 118   glGenTextures(1, &depth_texture);
 119   glBindTexture(GL_TEXTURE_2D, depth_texture);
 120   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 121   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 122   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 123   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 124   glFramebufferTexture2D(
 125       GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depth_texture, 0);
 126
 127   glUseProgram(program);
 128   glUniform2f(resolution_loc, kResolution, kResolution);
 129
 130   static const FormatType format_types[] = {
 131     { GL_DEPTH_COMPONENT, GL_UNSIGNED_SHORT },
 132     { GL_DEPTH_COMPONENT, GL_UNSIGNED_INT },
 133     { GL_DEPTH_STENCIL_OES, GL_UNSIGNED_INT_24_8_OES },
 134   };
 135   for (size_t ii = 0; ii < arraysize(format_types); ++ii) {
 136     const FormatType& format_type = format_types[ii];
 137     GLenum format = format_type.format;
 138     GLenum type = format_type.type;
 139
 140     if (format == GL_DEPTH_STENCIL_OES && !have_depth_stencil) {
 141       continue;
 142     }
 143
 144     glBindTexture(GL_TEXTURE_2D, depth_texture);
 145     glTexImage2D(
 146         GL_TEXTURE_2D, 0, format, kResolution, kResolution,
 147         0, format, type, NULL);
 148
 149     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 150     GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
 151     EXPECT_EQ(static_cast<GLenum>(GL_FRAMEBUFFER_COMPLETE), status)
 152         << "iteration: " << ii;
 153     if (status != GL_FRAMEBUFFER_COMPLETE) {
 154       continue;
 155     }
 156
 157     if (!GLTestHelper::CheckGLError("no errors after setup", __LINE__)) {
 158       continue;
 159     }
 160
 161     glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
 162     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 163
 164     // Disconnect the texture so we'll render with the default texture.
 165     glBindTexture(GL_TEXTURE_2D, 0);
 166
 167     // Render to the fbo.
 168     glDrawArrays(GL_TRIANGLES, 0, 6);
 169
 170     if (!GLTestHelper::CheckGLError("no errors after depth draw", __LINE__)) {
 171       continue;
 172     }
 173
 174     // Render with the depth texture.
 175     glBindFramebuffer(GL_FRAMEBUFFER, 0);
 176     glBindTexture(GL_TEXTURE_2D, depth_texture);
 177     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 178     glDrawArrays(GL_TRIANGLES, 0, 6);
 179
 180     if (!GLTestHelper::CheckGLError("no errors after texture draw", __LINE__)) {
 181       continue;
 182     }
 183
 184     uint8 actual_pixels[kResolution * kResolution * 4] = { 0, };
 185     glReadPixels(
 186         0, 0, kResolution, kResolution, GL_RGBA, GL_UNSIGNED_BYTE,
 187         actual_pixels);
 188
 189     if (!GLTestHelper::CheckGLError("no errors after readpixels", __LINE__)) {
 190       continue;
 191     }
 192
 193     // Check that each pixel's red value is less than the previous pixel in
 194     // either direction. Basically verify we have a gradient. No assumption is
 195     // made about the other channels green, blue and alpha since, according to
 196     // the GL_CHROMIUM_depth_texture spec, they have undefined values for
 197     // depth textures.
 198     int bad_count = 0;  // used to not spam the log with too many messages.
 199     for (GLint yy = 0; bad_count < 16 && yy < kResolution; ++yy) {
 200       for (GLint xx = 0; bad_count < 16 && xx < kResolution; ++xx) {
 201         const uint8* actual = &actual_pixels[(yy * kResolution + xx) * 4];
 202         const uint8* left = actual - 4;
 203         const uint8* down = actual - kResolution * 4;
 204
 205         // NOTE: Qualcomm on Nexus 4 the right most column has the same
 206         // values as the next to right most column. (bad interpolator?)
 207         if (xx > 0 && xx < kResolution - 1) {
 208           EXPECT_GT(actual[0], left[0])
 209               << "pixel at " << xx << ", " << yy
 210               << " actual[0] =" << static_cast<unsigned>(actual[0])
 211               << " left[0] =" << static_cast<unsigned>(left[0])
 212               << " actual =" << reinterpret_cast<const void*>(actual)
 213               << " left =" << reinterpret_cast<const void*>(left);
 214           bad_count += (actual[0] > left[0] ? 0 : 1);
 215         }
 216
 217         if (yy > 0 && yy < kResolution - 1) {
 218           EXPECT_GT(actual[0], down[0]) << "pixel at " << xx << ", " << yy;
 219           bad_count += (actual[0] > down[0] ? 0 : 1);
 220         }
 221       }
 222     }
 223
 224     // Check that bottom left corner is vastly different thatn top right.
 225     EXPECT_GT(
 226         actual_pixels[(kResolution * kResolution - 1) * 4] - actual_pixels[0],
 227         0xC0);
 228
 229     GLTestHelper::CheckGLError("no errors after everything", __LINE__);
 230   }
 231 }
 232
 233 }  // namespace gpu
 234
 235
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 237