src/gpu/command_buffer/tests/compressed_texture_test.cc

   1 // Copyright 2013 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 "base/basictypes.h"
  10 #include "gpu/command_buffer/tests/gl_manager.h"
  11 #include "gpu/command_buffer/tests/gl_test_utils.h"
  12 #include "testing/gtest/include/gtest/gtest.h"
  13
  14 #define SHADER(src) #src
  15
  16 namespace gpu {
  17
  18 static const uint16 kRedMask = 0xF800;
  19 static const uint16 kGreenMask = 0x07E0;
  20 static const uint16 kBlueMask = 0x001F;
  21
  22 // Color palette in 565 format.
  23 static const uint16 kPalette[] = {
  24   kGreenMask | kBlueMask,   // Cyan.
  25   kBlueMask  | kRedMask,    // Magenta.
  26   kRedMask   | kGreenMask,  // Yellow.
  27   0x0000,                   // Black.
  28   kRedMask,                 // Red.
  29   kGreenMask,               // Green.
  30   kBlueMask,                // Blue.
  31   0xFFFF,                   // White.
  32 };
  33 static const unsigned kBlockSize = 4;
  34 static const unsigned kPaletteSize = sizeof(kPalette) / sizeof(kPalette[0]);
  35 static const unsigned kTextureWidth = kBlockSize * kPaletteSize;
  36 static const unsigned kTextureHeight = kBlockSize;
  37
  38 static const char* extension(GLenum format) {
  39   switch(format) {
  40     case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
  41     case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
  42       return "GL_EXT_texture_compression_dxt1";
  43     case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
  44       return "GL_CHROMIUM_texture_compression_dxt3";
  45     case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
  46       return "GL_CHROMIUM_texture_compression_dxt5";
  47     default:
  48       NOTREACHED();
  49   }
  50   return NULL;
  51 }
  52
  53 // Index that chooses the given colors (color_0 and color_1),
  54 // not the interpolated colors (color_2 and color_3).
  55 static const uint16 kColor0 = 0x0000;
  56 static const uint16 kColor1 = 0x5555;
  57
  58 static GLuint LoadCompressedTexture(const void* data,
  59                                     GLsizeiptr size,
  60                                     GLenum format,
  61                                     GLsizei width,
  62                                     GLsizei height) {
  63   GLuint texture;
  64   glGenTextures(1, &texture);
  65   glBindTexture(GL_TEXTURE_2D, texture);
  66   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  67   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
  68   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  69   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  70   glCompressedTexImage2D(
  71       GL_TEXTURE_2D, 0, format, width, height, 0, size, data);
  72   return texture;
  73 }
  74
  75 GLuint LoadTextureDXT1(bool alpha) {
  76   const unsigned kStride = 4;
  77   uint16 data[kStride * kPaletteSize];
  78   for (unsigned i = 0; i < kPaletteSize; ++i) {
  79     // Each iteration defines a 4x4 block of texture.
  80     unsigned j = kStride * i;
  81     data[j++] = kPalette[i];  // color_0.
  82     data[j++] = kPalette[i];  // color_1.
  83     data[j++] = kColor0;  // color index.
  84     data[j++] = kColor1;  // color index.
  85   }
  86   GLenum format = alpha ?
  87       GL_COMPRESSED_RGBA_S3TC_DXT1_EXT : GL_COMPRESSED_RGB_S3TC_DXT1_EXT;
  88   return LoadCompressedTexture(
  89       data, sizeof(data), format, kTextureWidth, kTextureHeight);
  90 }
  91
  92 GLuint LoadTextureDXT3() {
  93   const unsigned kStride = 8;
  94   const uint16 kOpaque = 0xFFFF;
  95   uint16 data[kStride * kPaletteSize];
  96   for (unsigned i = 0; i < kPaletteSize; ++i) {
  97     // Each iteration defines a 4x4 block of texture.
  98     unsigned j = kStride * i;
  99     data[j++] = kOpaque;  // alpha row 0.
 100     data[j++] = kOpaque;  // alpha row 1.
 101     data[j++] = kOpaque;  // alpha row 2.
 102     data[j++] = kOpaque;  // alpha row 3.
 103     data[j++] = kPalette[i];  // color_0.
 104     data[j++] = kPalette[i];  // color_1.
 105     data[j++] = kColor0;  // color index.
 106     data[j++] = kColor1;  // color index.
 107   }
 108   return LoadCompressedTexture(data,
 109                                sizeof(data),
 110                                GL_COMPRESSED_RGBA_S3TC_DXT3_EXT,
 111                                kTextureWidth,
 112                                kTextureHeight);
 113 }
 114
 115 GLuint LoadTextureDXT5() {
 116   const unsigned kStride = 8;
 117   const uint16 kClear = 0x0000;
 118   const uint16 kAlpha7 = 0xFFFF;  // Opaque alpha index.
 119   uint16 data[kStride * kPaletteSize];
 120   for (unsigned i = 0; i < kPaletteSize; ++i) {
 121     // Each iteration defines a 4x4 block of texture.
 122     unsigned j = kStride * i;
 123     data[j++] = kClear;  // alpha_0 | alpha_1.
 124     data[j++] = kAlpha7;  // alpha index.
 125     data[j++] = kAlpha7;  // alpha index.
 126     data[j++] = kAlpha7;  // alpha index.
 127     data[j++] = kPalette[i];  // color_0.
 128     data[j++] = kPalette[i];  // color_1.
 129     data[j++] = kColor0;  // color index.
 130     data[j++] = kColor1;  // color index.
 131   }
 132   return LoadCompressedTexture(data,
 133                                sizeof(data),
 134                                GL_COMPRESSED_RGBA_S3TC_DXT5_EXT,
 135                                kTextureWidth,
 136                                kTextureHeight);
 137 }
 138
 139 static void ToRGB888(uint16 rgb565, uint8 rgb888[]) {
 140   uint8 r5 = (rgb565 & kRedMask)   >> 11;
 141   uint8 g6 = (rgb565 & kGreenMask) >> 5;
 142   uint8 b5 = (rgb565 & kBlueMask);
 143   // Replicate upper bits to lower empty bits.
 144   rgb888[0] = (r5 << 3) | (r5 >> 2);
 145   rgb888[1] = (g6 << 2) | (g6 >> 4);
 146   rgb888[2] = (b5 << 3) | (b5 >> 2);
 147 }
 148
 149 class CompressedTextureTest : public ::testing::TestWithParam<GLenum> {
 150  protected:
 151   void SetUp() override {
 152     GLManager::Options options;
 153     options.size = gfx::Size(kTextureWidth, kTextureHeight);
 154     gl_.Initialize(options);
 155   }
 156
 157   void TearDown() override { gl_.Destroy(); }
 158
 159   GLuint LoadProgram() {
 160     const char* v_shader_src = SHADER(
 161         attribute vec2 a_position;
 162         varying vec2 v_texcoord;
 163         void main() {
 164           gl_Position = vec4(a_position, 0.0, 1.0);
 165           v_texcoord = (a_position + 1.0) * 0.5;
 166         }
 167     );
 168     const char* f_shader_src = SHADER(
 169         precision mediump float;
 170         uniform sampler2D u_texture;
 171         varying vec2 v_texcoord;
 172         void main() {
 173           gl_FragColor = texture2D(u_texture, v_texcoord);
 174         }
 175     );
 176     return GLTestHelper::LoadProgram(v_shader_src, f_shader_src);
 177   }
 178
 179   GLuint LoadTexture(GLenum format) {
 180     switch (format) {
 181       case GL_COMPRESSED_RGB_S3TC_DXT1_EXT: return LoadTextureDXT1(false);
 182       case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT: return LoadTextureDXT1(true);
 183       case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT: return LoadTextureDXT3();
 184       case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT: return LoadTextureDXT5();
 185       default: NOTREACHED();
 186     }
 187     return 0;
 188   }
 189
 190  private:
 191   GLManager gl_;
 192 };
 193
 194 // The test draws a texture in the given format and verifies that the drawn
 195 // pixels are of the same color as the texture.
 196 // The texture consists of 4x4 blocks of texels (same as DXT), one for each
 197 // color defined in kPalette.
 198 TEST_P(CompressedTextureTest, Draw) {
 199   GLenum format = GetParam();
 200
 201   // This test is only valid if compressed texture extension is supported.
 202   const char* ext = extension(format);
 203   if (!GLTestHelper::HasExtension(ext))
 204     return;
 205
 206   // Load shader program.
 207   GLuint program = LoadProgram();
 208   ASSERT_NE(program, 0u);
 209   GLint position_loc = glGetAttribLocation(program, "a_position");
 210   GLint texture_loc = glGetUniformLocation(program, "u_texture");
 211   ASSERT_NE(position_loc, -1);
 212   ASSERT_NE(texture_loc, -1);
 213   glUseProgram(program);
 214
 215   // Load geometry.
 216   GLuint vbo = GLTestHelper::SetupUnitQuad(position_loc);
 217   ASSERT_NE(vbo, 0u);
 218
 219   // Load texture.
 220   GLuint texture = LoadTexture(format);
 221   ASSERT_NE(texture, 0u);
 222   glActiveTexture(GL_TEXTURE0);
 223   glBindTexture(GL_TEXTURE_2D, texture);
 224   glUniform1i(texture_loc, 0);
 225
 226   // Draw.
 227   glDrawArrays(GL_TRIANGLES, 0, 6);
 228   glFlush();
 229
 230   // Verify results.
 231   int origin[] = {0, 0};
 232   uint8 expected_rgba[] = {0, 0, 0, 255};
 233   for (unsigned i = 0; i < kPaletteSize; ++i) {
 234     origin[0] = kBlockSize * i;
 235     ToRGB888(kPalette[i], expected_rgba);
 236     EXPECT_TRUE(GLTestHelper::CheckPixels(origin[0], origin[1],
 237                                           kBlockSize, kBlockSize,
 238                                           0, expected_rgba));
 239   }
 240   GLTestHelper::CheckGLError("CompressedTextureTest.Draw", __LINE__);
 241 }
 242
 243 static const GLenum kFormats[] = {
 244   GL_COMPRESSED_RGB_S3TC_DXT1_EXT,
 245   GL_COMPRESSED_RGBA_S3TC_DXT1_EXT,
 246   GL_COMPRESSED_RGBA_S3TC_DXT3_EXT,
 247   GL_COMPRESSED_RGBA_S3TC_DXT5_EXT
 248 };
 249 INSTANTIATE_TEST_CASE_P(Format,
 250                         CompressedTextureTest,
 251                         ::testing::ValuesIn(kFormats));
 252
 253 }  // namespace gpu