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Diffstat (limited to 'chromium/third_party/angle/samples/gles2_book/Simple_Texture2D/Simple_Texture2D.c')
| -rw-r--r-- | chromium/third_party/angle/samples/gles2_book/Simple_Texture2D/Simple_Texture2D.c | 198 |
1 files changed, 0 insertions, 198 deletions
diff --git a/chromium/third_party/angle/samples/gles2_book/Simple_Texture2D/Simple_Texture2D.c b/chromium/third_party/angle/samples/gles2_book/Simple_Texture2D/Simple_Texture2D.c deleted file mode 100644 index b074608a757..00000000000 --- a/chromium/third_party/angle/samples/gles2_book/Simple_Texture2D/Simple_Texture2D.c +++ /dev/null @@ -1,198 +0,0 @@ -// -// Book: OpenGL(R) ES 2.0 Programming Guide -// Authors: Aaftab Munshi, Dan Ginsburg, Dave Shreiner -// ISBN-10: 0321502795 -// ISBN-13: 9780321502797 -// Publisher: Addison-Wesley Professional -// URLs: http://safari.informit.com/9780321563835 -// http://www.opengles-book.com -// - -// Simple_Texture2D.c -// -// This is a simple example that draws a quad with a 2D -// texture image. The purpose of this example is to demonstrate -// the basics of 2D texturing -// -#include <stdlib.h> -#include "esUtil.h" - -typedef struct -{ - // Handle to a program object - GLuint programObject; - - // Attribute locations - GLint positionLoc; - GLint texCoordLoc; - - // Sampler location - GLint samplerLoc; - - // Texture handle - GLuint textureId; - -} UserData; - -/// -// Create a simple 2x2 texture image with four different colors -// -GLuint CreateSimpleTexture2D( ) -{ - // Texture object handle - GLuint textureId; - - // 2x2 Image, 3 bytes per pixel (R, G, B) - GLubyte pixels[4 * 3] = - { - 255, 0, 0, // Red - 0, 255, 0, // Green - 0, 0, 255, // Blue - 255, 255, 0 // Yellow - }; - - // Use tightly packed data - glPixelStorei ( GL_UNPACK_ALIGNMENT, 1 ); - - // Generate a texture object - glGenTextures ( 1, &textureId ); - - // Bind the texture object - glBindTexture ( GL_TEXTURE_2D, textureId ); - - // Load the texture - glTexImage2D ( GL_TEXTURE_2D, 0, GL_RGB, 2, 2, 0, GL_RGB, GL_UNSIGNED_BYTE, pixels ); - - // Set the filtering mode - glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST ); - glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST ); - - return textureId; - -} - - -/// -// Initialize the shader and program object -// -int Init ( ESContext *esContext ) -{ - UserData *userData = esContext->userData; - GLbyte vShaderStr[] = - "attribute vec4 a_position; \n" - "attribute vec2 a_texCoord; \n" - "varying vec2 v_texCoord; \n" - "void main() \n" - "{ \n" - " gl_Position = a_position; \n" - " v_texCoord = a_texCoord; \n" - "} \n"; - - GLbyte fShaderStr[] = - "precision mediump float; \n" - "varying vec2 v_texCoord; \n" - "uniform sampler2D s_texture; \n" - "void main() \n" - "{ \n" - " gl_FragColor = texture2D( s_texture, v_texCoord );\n" - "} \n"; - - // Load the shaders and get a linked program object - userData->programObject = esLoadProgram ( vShaderStr, fShaderStr ); - - // Get the attribute locations - userData->positionLoc = glGetAttribLocation ( userData->programObject, "a_position" ); - userData->texCoordLoc = glGetAttribLocation ( userData->programObject, "a_texCoord" ); - - // Get the sampler location - userData->samplerLoc = glGetUniformLocation ( userData->programObject, "s_texture" ); - - // Load the texture - userData->textureId = CreateSimpleTexture2D (); - - glClearColor ( 0.0f, 0.0f, 0.0f, 0.0f ); - return TRUE; -} - -/// -// Draw a triangle using the shader pair created in Init() -// -void Draw ( ESContext *esContext ) -{ - UserData *userData = esContext->userData; - GLfloat vVertices[] = { -0.5f, 0.5f, 0.0f, // Position 0 - 0.0f, 0.0f, // TexCoord 0 - -0.5f, -0.5f, 0.0f, // Position 1 - 0.0f, 1.0f, // TexCoord 1 - 0.5f, -0.5f, 0.0f, // Position 2 - 1.0f, 1.0f, // TexCoord 2 - 0.5f, 0.5f, 0.0f, // Position 3 - 1.0f, 0.0f // TexCoord 3 - }; - GLushort indices[] = { 0, 1, 2, 0, 2, 3 }; - - // Set the viewport - glViewport ( 0, 0, esContext->width, esContext->height ); - - // Clear the color buffer - glClear ( GL_COLOR_BUFFER_BIT ); - - // Use the program object - glUseProgram ( userData->programObject ); - - // Load the vertex position - glVertexAttribPointer ( userData->positionLoc, 3, GL_FLOAT, - GL_FALSE, 5 * sizeof(GLfloat), vVertices ); - // Load the texture coordinate - glVertexAttribPointer ( userData->texCoordLoc, 2, GL_FLOAT, - GL_FALSE, 5 * sizeof(GLfloat), &vVertices[3] ); - - glEnableVertexAttribArray ( userData->positionLoc ); - glEnableVertexAttribArray ( userData->texCoordLoc ); - - // Bind the texture - glActiveTexture ( GL_TEXTURE0 ); - glBindTexture ( GL_TEXTURE_2D, userData->textureId ); - - // Set the sampler texture unit to 0 - glUniform1i ( userData->samplerLoc, 0 ); - - glDrawElements ( GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices ); - - eglSwapBuffers ( esContext->eglDisplay, esContext->eglSurface ); -} - -/// -// Cleanup -// -void ShutDown ( ESContext *esContext ) -{ - UserData *userData = esContext->userData; - - // Delete texture object - glDeleteTextures ( 1, &userData->textureId ); - - // Delete program object - glDeleteProgram ( userData->programObject ); -} - - -int main ( int argc, char *argv[] ) -{ - ESContext esContext; - UserData userData; - - esInitContext ( &esContext ); - esContext.userData = &userData; - - esCreateWindow ( &esContext, TEXT("Simple Texture 2D"), 320, 240, ES_WINDOW_RGB ); - - if ( !Init ( &esContext ) ) - return 0; - - esRegisterDrawFunc ( &esContext, Draw ); - - esMainLoop ( &esContext ); - - ShutDown ( &esContext ); -} |