Reland a portion of r215672.

gpu/demos/compressed_textures/compressed_textures.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-#include <GLES2/gl2.h>
-#include <GLES2/gl2ext.h>
-#include <GLES2/gl2extchromium.h>
-#include <math.h>
-#include <stdio.h>
-#include <string>
-
-// Some tests for compressed textures.
-#include "gpu/demos/framework/demo_factory.h"
-#include "gpu/demos/gles2_book/example.h"
-
-namespace gpu {
-namespace demos {
-
-namespace {
-
-int g_frameCount = 0;
-int g_textureIndex = 0;
-int g_numTextures = 1;
-GLuint g_textures[5];
-int g_textureLoc = -1;
-GLuint g_programObject = 0;
-GLuint g_vbo = 0;
-
-void CheckGLError(const char* func_name, int line_no) {
-#ifndef NDEBUG
-  GLenum error = GL_NO_ERROR;
-  while ((error = glGetError()) != GL_NO_ERROR) {
-    fprintf(stderr, "GL ERROR in %s at line %d : 0x%04x\n",
-            func_name, line_no, error);
-  }
-#endif
-}
-
-GLuint LoadShader(GLenum type, const char* shaderSrc) {
-  CheckGLError("LoadShader", __LINE__);
-  GLuint shader = glCreateShader(type);
-  if (shader == 0) {
-    return 0;
-  }
-  // Load the shader source
-  glShaderSource(shader, 1, &shaderSrc, NULL);
-  // Compile the shader
-  glCompileShader(shader);
-  // Check the compile status
-  GLint value = 0;
-  glGetShaderiv(shader, GL_COMPILE_STATUS, &value);
-  if (value == 0) {
-    char buffer[1024];
-    GLsizei length = 0;
-    glGetShaderInfoLog(shader, sizeof(buffer), &length, buffer);
-    std::string log(buffer, length);
-    fprintf(stderr, "Error compiling shader: %s\n", log.c_str());
-    glDeleteShader(shader);
-    return 0;
-  }
-  return shader;
-}
-
-void InitShaders() {
-  static const char* vShaderStr =
-    "attribute vec2 g_Position;\n"
-    "varying vec2 texCoord;\n"
-    "void main()\n"
-    "{\n"
-    "   gl_Position = vec4(g_Position.x, g_Position.y, 0.0, 1.0);\n"
-    "   texCoord = g_Position * vec2(0.5) + vec2(0.5);\n"
-    "}\n";
-  static const char* fShaderStr =
-    "precision mediump float;"
-    "uniform sampler2D tex;\n"
-    "varying vec2 texCoord;\n"
-    "void main()\n"
-    "{\n"
-    "  gl_FragColor = texture2D(tex, texCoord);\n"
-    "}\n";
-
-  CheckGLError("InitShaders", __LINE__);
-  GLuint vertexShader = LoadShader(GL_VERTEX_SHADER, vShaderStr);
-  GLuint fragmentShader = LoadShader(GL_FRAGMENT_SHADER, fShaderStr);
-  // Create the program object
-  GLuint programObject = glCreateProgram();
-  if (programObject == 0) {
-    fprintf(stderr, "Creating program failed\n");
-    return;
-  }
-  glAttachShader(programObject, vertexShader);
-  glAttachShader(programObject, fragmentShader);
-  // Bind g_Position to attribute 0
-  glBindAttribLocation(programObject, 0, "g_Position");
-  // Link the program
-  glLinkProgram(programObject);
-  // Check the link status
-  GLint linked = 0;
-  glGetProgramiv(programObject, GL_LINK_STATUS, &linked);
-  if (linked == 0) {
-    char buffer[1024];
-    GLsizei length = 0;
-    glGetProgramInfoLog(programObject, sizeof(buffer), &length, buffer);
-    std::string log(buffer, length);
-    fprintf(stderr, "Error linking program: %s\n", log.c_str());
-    glDeleteProgram(programObject);
-    return;
-  }
-  g_programObject = programObject;
-  g_textureLoc = glGetUniformLocation(g_programObject, "tex");
-  glGenBuffers(1, &g_vbo);
-  glBindBuffer(GL_ARRAY_BUFFER, g_vbo);
-  static float vertices[] = {
-      1.0f,  1.0f,
-     -1.0f,  1.0f,
-     -1.0f, -1.0f,
-      1.0f,  1.0f,
-     -1.0f, -1.0f,
-      1.0f, -1.0f
-  };
-  glBufferData(GL_ARRAY_BUFFER,
-               sizeof(vertices),
-               vertices,
-               GL_STATIC_DRAW);
-  CheckGLError("InitShaders", __LINE__);
-}
-
-GLuint CreateCheckerboardTexture() {
-  CheckGLError("CreateCheckerboardTexture", __LINE__);
-  static unsigned char pixels[] = {
-    255, 255, 255,
-    0,   0,   0,
-    0,   0,   0,
-    255, 255, 255,
-  };
-  GLuint texture;
-  glGenTextures(1, &texture);
-  glBindTexture(GL_TEXTURE_2D, texture);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-  glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
-  glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 2, 2, 0, GL_RGB, GL_UNSIGNED_BYTE,
-               pixels);
-  CheckGLError("CreateCheckerboardTexture", __LINE__);
-  return texture;
-}
-
-GLuint CreateCompressedTexture(
-    const void* data,
-    GLsizeiptr size,
-    GLenum format,
-    GLint width,
-    GLint height) {
-  GLuint texture;
-  glGenTextures(1, &texture);
-  glBindTexture(GL_TEXTURE_2D, texture);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-  glCompressedTexImage2D(
-      GL_TEXTURE_2D, 0, format, width, height, 0, size, data);
-  CheckGLError("CreateCompressedTxture", __LINE__);
-  return texture;
-}
-
-GLuint LoadDXT1RGBTexture() {
-  static unsigned char data[] = {
-    0x00, 0xd0, 0x00, 0xef, 0x00, 0xaa, 0x95, 0xd5,
-    0x00, 0x90, 0x57, 0xff, 0x00, 0xaa, 0xff, 0x55,
-    0x00, 0x88, 0x99, 0xff, 0x00, 0xaa, 0xff, 0x55,
-    0x20, 0xb8, 0xe4, 0xf6, 0x00, 0xaa, 0x5b, 0x5d,
-    0x21, 0x09, 0xe6, 0x27, 0x15, 0x15, 0x15, 0x15,
-    0xd7, 0xbd, 0xff, 0xff, 0x56, 0x16, 0x16, 0x56,
-    0x00, 0x00, 0xff, 0xff, 0x55, 0x00, 0x00, 0x55,
-    0xe0, 0x08, 0xa9, 0x2f, 0x51, 0x58, 0x56, 0x54,
-    0xff, 0x07, 0x15, 0x09, 0x40, 0x6a, 0xd5, 0xd5,
-    0xd7, 0xbd, 0xff, 0xff, 0x56, 0x16, 0x16, 0x16,
-    0x91, 0x08, 0xff, 0xff, 0x55, 0xff, 0x00, 0x03,
-    0xfe, 0x07, 0x5b, 0x09, 0x01, 0xa9, 0x55, 0xff,
-    0x0d, 0x10, 0x18, 0xe8, 0xea, 0x15, 0x95, 0x55,
-    0x08, 0x88, 0x3c, 0xe7, 0x55, 0x55, 0xff, 0x00,
-    0x10, 0x20, 0x18, 0xe8, 0xa8, 0x54, 0x56, 0x55,
-    0x1f, 0x78, 0x15, 0xf8, 0x00, 0xaa, 0x55, 0x55,
-  };
-  return CreateCompressedTexture(
-      data, sizeof(data), GL_COMPRESSED_RGB_S3TC_DXT1_EXT, 16, 16);
-}
-
-GLuint LoadDXT1RGBATexture() {
-  static unsigned char data[] = {
-    0xff, 0xff, 0x90, 0xee, 0x00, 0xaa, 0xff, 0x55,
-    0x53, 0xde, 0xdd, 0xff, 0x55, 0x55, 0x00, 0xff,
-    0xc9, 0xb4, 0xdd, 0xff, 0x55, 0x55, 0xaa, 0xff,
-    0x6f, 0xee, 0xdd, 0xff, 0x55, 0x55, 0xa8, 0x03,
-    0x60, 0xa3, 0xa5, 0xe5, 0x55, 0x55, 0xaa, 0x00,
-    0x00, 0x00, 0x01, 0x00, 0xff, 0xff, 0xff, 0xff,
-    0x80, 0xab, 0xc2, 0xc4, 0xff, 0x55, 0xaa, 0xff,
-    0x60, 0x9b, 0xa5, 0xe5, 0x57, 0x56, 0xaa, 0x00,
-    0x1f, 0xbf, 0xff, 0xf7, 0x55, 0x55, 0xaa, 0x00,
-    0x00, 0x00, 0x01, 0x00, 0xff, 0xff, 0xff, 0xff,
-    0xfe, 0xbe, 0x7e, 0xdf, 0xff, 0xaa, 0x55, 0x00,
-    0xfe, 0xbe, 0xff, 0xf7, 0x54, 0x56, 0xaa, 0x00,
-    0xfa, 0x4c, 0x7e, 0x9e, 0x55, 0xaa, 0x00, 0x00,
-    0xbb, 0x2c, 0x98, 0x54, 0xff, 0xff, 0x55, 0xaa,
-    0xfa, 0x4c, 0x7e, 0x9e, 0x55, 0xaa, 0x00, 0x00,
-    0xfa, 0x4c, 0x7e, 0x9e, 0x55, 0xaa, 0x00, 0x00,
-  };
-  return CreateCompressedTexture(
-      data, sizeof(data), GL_COMPRESSED_RGBA_S3TC_DXT1_EXT, 16, 16);
-}
-
-GLuint LoadDXT3RGBATexture() {
-  static unsigned char data[] = {
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xa3, 0x22, 0x03, 0x03, 0x55, 0xff, 0xaa, 0x00,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00,
-    0xcf, 0x7c, 0xc3, 0x12, 0x55, 0x55, 0x55, 0x54,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00,
-    0x83, 0x1a, 0x03, 0x03, 0x55, 0xff, 0x00, 0x00,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, 0xff,
-    0xcf, 0x7c, 0xc3, 0x12, 0x55, 0x55, 0x55, 0x54,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xc3, 0x59, 0x63, 0x32, 0x55, 0xff, 0xaa, 0x00,
-    0x00, 0x00, 0x00, 0x40, 0x00, 0x40, 0x00, 0x00,
-    0x8f, 0x94, 0x03, 0x4a, 0x54, 0x94, 0x94, 0x54,
-    0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00,
-    0xa3, 0x59, 0x43, 0x2a, 0x55, 0xff, 0xaa, 0x00,
-    0xf0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0xff,
-    0xaf, 0x84, 0x03, 0x42, 0x54, 0x55, 0x55, 0x55,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xc3, 0xa0, 0x83, 0x71, 0x55, 0xff, 0xaa, 0x00,
-    0x00, 0x00, 0x00, 0x40, 0x00, 0x40, 0x00, 0x40,
-    0x0f, 0xb4, 0x43, 0x81, 0x54, 0x94, 0x94, 0x94,
-    0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xc3, 0xa0, 0x83, 0x69, 0x55, 0xff, 0xaa, 0x00,
-    0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xc3, 0xa0, 0x83, 0x69, 0x55, 0xfd, 0xaa, 0x00,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0x23, 0xd0, 0xa3, 0xb0, 0x55, 0xff, 0xaa, 0x00,
-    0x00, 0x40, 0x00, 0x40, 0xff, 0xff, 0xff, 0xff,
-    0xf0, 0xc3, 0x43, 0xc0, 0x94, 0x94, 0x55, 0x55,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0x23, 0xd0, 0xa3, 0xb0, 0x55, 0xff, 0xaa, 0x00,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0x23, 0xd0, 0xa3, 0xb0, 0x55, 0xff, 0xaa, 0x00,
-  };
-  return CreateCompressedTexture(
-      data, sizeof(data), GL_COMPRESSED_RGBA_S3TC_DXT3_EXT, 16, 16);
-}
-
-GLuint LoadDXT5RGBATexture() {
-  static unsigned char data[] = {
-    0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-    0x72, 0xdd, 0x03, 0x92, 0x2d, 0x2d, 0x2d, 0x2d,
-    0x04, 0xfb, 0xff, 0xff, 0xff, 0x49, 0x02, 0xdb,
-    0x97, 0xf6, 0x32, 0xcd, 0xc0, 0xc0, 0x7b, 0xc0,
-    0xfb, 0xff, 0x49, 0x92, 0x24, 0x00, 0x60, 0xdb,
-    0x11, 0xcd, 0x67, 0x82, 0x78, 0x78, 0x5e, 0x78,
-    0x04, 0xfb, 0xff, 0xff, 0xff, 0xf9, 0x8f, 0xff,
-    0x2e, 0xac, 0xc4, 0x71, 0x15, 0x15, 0x15, 0x14,
-    0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-    0x72, 0xdd, 0x03, 0x92, 0x2d, 0x2d, 0x2d, 0x2d,
-    0x04, 0x43, 0xb0, 0x0d, 0x3b, 0xb0, 0x03, 0xdb,
-    0xb8, 0xf6, 0xd5, 0xd5, 0x60, 0x60, 0x60, 0x60,
-    0xfb, 0x00, 0x49, 0x02, 0x00, 0x00, 0x90, 0x24,
-    0xb0, 0xbc, 0x26, 0x7a, 0x78, 0x78, 0x78, 0x78,
-    0x04, 0xf7, 0xf8, 0x9f, 0xff, 0xf9, 0x9f, 0xff,
-    0x0e, 0xac, 0x83, 0x69, 0x34, 0x35, 0x35, 0x35,
-    0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-    0x72, 0xdd, 0x03, 0x92, 0x2d, 0x2d, 0x2d, 0x2d,
-    0x04, 0x43, 0xb0, 0x0d, 0x3b, 0xb0, 0x03, 0x3b,
-    0xb8, 0xf6, 0xd5, 0xd5, 0x60, 0x60, 0x60, 0x60,
-    0xfb, 0xff, 0xb6, 0x0d, 0x00, 0x49, 0x92, 0x24,
-    0x11, 0xcd, 0x67, 0x82, 0x78, 0x5e, 0x78, 0x78,
-    0xea, 0xff, 0x4a, 0xd2, 0x24, 0x49, 0x92, 0x24,
-    0x0e, 0xac, 0xc4, 0x71, 0x15, 0x15, 0x15, 0x15,
-    0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-    0x72, 0xdd, 0x03, 0x92, 0x2d, 0x2d, 0x2d, 0x2d,
-    0xfd, 0x00, 0x49, 0x9c, 0xc4, 0x00, 0x00, 0x00,
-    0xb8, 0xf6, 0x53, 0xcd, 0xe0, 0xe0, 0x7f, 0xe0,
-    0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-    0xf1, 0xcc, 0x46, 0x82, 0x78, 0x78, 0x78, 0x78,
-    0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-    0x0e, 0xac, 0xc4, 0x71, 0x15, 0x15, 0x15, 0x15,
-  };
-  return CreateCompressedTexture(
-      data, sizeof(data), GL_COMPRESSED_RGBA_S3TC_DXT5_EXT, 16, 16);
-}
-
-}  // anonymous namespace.
-
-static int stInit(ESContext *esContext) {
-  CheckGLError("GLFromCPPInit", __LINE__);
-  g_textures[0] = CreateCheckerboardTexture();
-  glClearColor(0.f, 0.f, .7f, 1.f);
-  const char* extensions =
-      reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS));
-  if (strstr(extensions, "GL_EXT_texture_compression_dxt1")) {
-    g_textures[g_numTextures++] = LoadDXT1RGBTexture();
-    g_textures[g_numTextures++] = LoadDXT1RGBATexture();
-  }
-  if (strstr(extensions, "GL_CHROMIUM_texture_compression_dxt3")) {
-    g_textures[g_numTextures++] = LoadDXT3RGBATexture();
-  }
-  if (strstr(extensions, "GL_CHROMIUM_texture_compression_dxt5")) {
-    g_textures[g_numTextures++] = LoadDXT5RGBATexture();
-  }
-  InitShaders();
-  CheckGLError("GLFromCPPInit", __LINE__);
-  return 1;
-}
-
-static void stDraw (ESContext *esContext) {
-  CheckGLError("GLFromCPPDraw", __LINE__);
-
-  g_frameCount++;
-  if (g_frameCount > 60)
-  {
-    g_frameCount = 0;
-    g_textureIndex = (g_textureIndex + 1) % g_numTextures;
-  }
-
-  glViewport(0, 0, esContext->width, esContext->height);
-  // Clear the color buffer
-  glClear(GL_COLOR_BUFFER_BIT);
-  glEnable(GL_BLEND);
-  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
-  CheckGLError("GLFromCPPDraw", __LINE__);
-  // Use the program object
-  glUseProgram(g_programObject);
-  CheckGLError("GLFromCPPDraw", __LINE__);
-
-  // Load the vertex data
-  glBindBuffer(GL_ARRAY_BUFFER, g_vbo);
-  glEnableVertexAttribArray(0);
-  glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, 0);
-  CheckGLError("GLFromCPPDraw", __LINE__);
-  // Bind the texture to texture unit 0
-  glBindTexture(GL_TEXTURE_2D, g_textures[g_textureIndex]);
-  CheckGLError("GLFromCPPDraw", __LINE__);
-  // Point the uniform sampler to texture unit 0
-  glUniform1i(g_textureLoc, 0);
-  CheckGLError("GLFromCPPDraw", __LINE__);
-  glDrawArrays(GL_TRIANGLES, 0, 6);
-  CheckGLError("GLFromCPPDraw", __LINE__);
-  glFlush();
-}
-
-static void stShutDown (ESContext *esContext) {
-}
-
-struct STUserData {
-  int dummy;
-};
-
-class CompressedTextureTest : public gles2_book::Example<STUserData> {
- public:
-  CompressedTextureTest() {
-    RegisterCallbacks(stInit, NULL, stDraw, stShutDown);
-  }
-
-  const wchar_t* Title() const {
-    return L"Compressed Texture Test";
-  }
-
-  bool IsAnimated() {
-    return true;
-  }
-};
-
-Demo* CreateDemo() {
-  return new CompressedTextureTest();
-}
-
-}  // namespace demos
-}  // namespace gpu
-
-