Add back in compressed_textures sample.

gpu/demos/compressed_textures/compressed_textures.cc

Index: gpu/demos/compressed_textures/compressed_textures.cc
diff --git a/gpu/demos/compressed_textures/compressed_textures.cc b/gpu/demos/compressed_textures/compressed_textures.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a970718ba2258f36a9b864938c43133fa2498c3f
--- /dev/null
+++ b/gpu/demos/compressed_textures/compressed_textures.cc
@@ -0,0 +1,433 @@
+// 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 <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_worldMatrixLoc = 0;
+GLuint g_vbo = 0;
+GLsizei g_texCoordOffset = 0;
+int g_angle = 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 =
+    "uniform mat4 worldMatrix;\n"
+    "attribute vec3 g_Position;\n"
+    "attribute vec2 g_TexCoord0;\n"
+    "varying vec2 texCoord;\n"
+    "void main()\n"
+    "{\n"
+    "   gl_Position = worldMatrix *\n"
+    "                 vec4(g_Position.x, g_Position.y, g_Position.z, 1.0);\n"
+    "   texCoord = g_TexCoord0;\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
+  // Bind g_TexCoord0 to attribute 1
+  glBindAttribLocation(programObject, 0, "g_Position");
+  glBindAttribLocation(programObject, 1, "g_TexCoord0");
+  // 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_worldMatrixLoc = glGetUniformLocation(g_programObject, "worldMatrix");
+  g_textureLoc = glGetUniformLocation(g_programObject, "tex");
+  glGenBuffers(1, &g_vbo);
+  glBindBuffer(GL_ARRAY_BUFFER, g_vbo);
+  static float vertices[] = {
+      0.25,  0.75, 0.0,
+     -0.75,  0.75, 0.0,
+     -0.75, -0.25, 0.0,
+      0.25,  0.75, 0.0,
+     -0.75, -0.25, 0.0,
+      0.25, -0.25, 0.0,
+  };
+  static float texCoords[] = {
+    1.0, 1.0,
+    0.0, 1.0,
+    0.0, 0.0,
+    1.0, 1.0,
+    0.0, 0.0,
+    1.0, 0.0,
+  };
+  g_texCoordOffset = sizeof(vertices);
+  glBufferData(GL_ARRAY_BUFFER,
+               sizeof(vertices) + sizeof(texCoords),
+               NULL,
+               GL_STATIC_DRAW);
+  glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(vertices), vertices);
+  glBufferSubData(GL_ARRAY_BUFFER, g_texCoordOffset,
+                  sizeof(texCoords), texCoords);
+  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) {
+  const float kPi = 3.1415926535897932384626433832795f;
+
+  CheckGLError("GLFromCPPDraw", __LINE__);
+  // TODO(kbr): base the angle on time rather than on ticks
+  g_angle = (g_angle + 1) % 360;
+  // Rotate about the Z axis
+  GLfloat rot_matrix[16];
+  GLfloat cos_angle = cosf(static_cast<GLfloat>(g_angle) * kPi / 180.0f);
+  GLfloat sin_angle = sinf(static_cast<GLfloat>(g_angle) * kPi / 180.0f);
+  // OpenGL matrices are column-major
+  rot_matrix[0] = cos_angle;
+  rot_matrix[1] = sin_angle;
+  rot_matrix[2] = 0.0f;
+  rot_matrix[3] = 0.0f;
+
+  rot_matrix[4] = -sin_angle;
+  rot_matrix[5] = cos_angle;
+  rot_matrix[6] = 0.0f;
+  rot_matrix[7] = 0.0f;
+
+  rot_matrix[8] = 0.0f;
+  rot_matrix[9] = 0.0f;
+  rot_matrix[10] = 1.0f;
+  rot_matrix[11] = 0.0f;
+
+  rot_matrix[12] = 0.0f;
+  rot_matrix[13] = 0.0f;
+  rot_matrix[14] = 0.0f;
+  rot_matrix[15] = 1.0f;
+
+  g_frameCount++;
+  if (g_frameCount > 60)
+  {
+    g_frameCount = 0;
+    g_textureIndex = (g_textureIndex + 1) % g_numTextures;
+  }
+
+  // Note: the viewport is automatically set up to cover the entire Canvas.
+  // 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__);
+  // Set up the model matrix
+  glUniformMatrix4fv(g_worldMatrixLoc, 1, GL_FALSE, rot_matrix);
+
+  // Load the vertex data
+  glBindBuffer(GL_ARRAY_BUFFER, g_vbo);
+  glEnableVertexAttribArray(0);
+  glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);
+  glEnableVertexAttribArray(1);
+  glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 0,
+                        reinterpret_cast<const void*>(g_texCoordOffset));
+  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
+
+