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kripkenkripken
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add original versions of glbook tests, gles2.0 and not webgl-friendly
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‎tests/glbook/Chapter_10/MultiTexture/MultiTexture_orig.c‎

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//
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// Book: OpenGL(R) ES 2.0 Programming Guide
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// Authors: Aaftab Munshi, Dan Ginsburg, Dave Shreiner
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// ISBN-10: 0321502795
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// ISBN-13: 9780321502797
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// Publisher: Addison-Wesley Professional
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// URLs: http://safari.informit.com/9780321563835
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// http://www.opengles-book.com
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//
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// MultiTexture.c
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//
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// This is an example that draws a quad with a basemap and
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// lightmap to demonstrate multitexturing.
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//
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#include <stdlib.h>
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#include "esUtil.h"
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typedef struct
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{
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// Handle to a program object
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GLuint programObject;
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// Attribute locations
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GLint positionLoc;
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GLint texCoordLoc;
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// Sampler locations
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GLint baseMapLoc;
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GLint lightMapLoc;
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// Texture handle
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GLuint baseMapTexId;
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GLuint lightMapTexId;
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} UserData;
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///
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// Load texture from disk
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//
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GLuint LoadTexture ( char *fileName )
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{
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int width,
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height;
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char *buffer = esLoadTGA ( fileName, &width, &height );
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GLuint texId;
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if ( buffer == NULL )
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{
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esLogMessage ( "Error loading (%s) image.\n", fileName );
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return 0;
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}
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glGenTextures ( 1, &texId );
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glBindTexture ( GL_TEXTURE_2D, texId );
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glTexImage2D ( GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, buffer );
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glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
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glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
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glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
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glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
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free ( buffer );
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return texId;
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}
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///
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// Initialize the shader and program object
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//
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int Init ( ESContext *esContext )
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{
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UserData *userData = esContext->userData;
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GLbyte vShaderStr[] =
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"attribute vec4 a_position; \n"
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"attribute vec2 a_texCoord; \n"
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"varying vec2 v_texCoord; \n"
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"void main() \n"
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"{ \n"
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" gl_Position = a_position; \n"
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" v_texCoord = a_texCoord; \n"
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"} \n";
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GLbyte fShaderStr[] =
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"precision mediump float; \n"
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"varying vec2 v_texCoord; \n"
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"uniform sampler2D s_baseMap; \n"
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"uniform sampler2D s_lightMap; \n"
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"void main() \n"
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"{ \n"
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" vec4 baseColor; \n"
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" vec4 lightColor; \n"
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" \n"
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" baseColor = texture2D( s_baseMap, v_texCoord ); \n"
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" lightColor = texture2D( s_lightMap, v_texCoord ); \n"
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" gl_FragColor = baseColor * (lightColor + 0.25); \n"
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"} \n";
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// Load the shaders and get a linked program object
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userData->programObject = esLoadProgram ( vShaderStr, fShaderStr );
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// Get the attribute locations
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userData->positionLoc = glGetAttribLocation ( userData->programObject, "a_position" );
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userData->texCoordLoc = glGetAttribLocation ( userData->programObject, "a_texCoord" );
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// Get the sampler location
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userData->baseMapLoc = glGetUniformLocation ( userData->programObject, "s_baseMap" );
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userData->lightMapLoc = glGetUniformLocation ( userData->programObject, "s_lightMap" );
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// Load the textures
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userData->baseMapTexId = LoadTexture ( "basemap.tga" );
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userData->lightMapTexId = LoadTexture ( "lightmap.tga" );
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if ( userData->baseMapTexId == 0 || userData->lightMapTexId == 0 )
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return FALSE;
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glClearColor ( 0.0f, 0.0f, 0.0f, 0.0f );
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return TRUE;
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}
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///
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// Draw a triangle using the shader pair created in Init()
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//
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void Draw ( ESContext *esContext )
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{
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UserData *userData = esContext->userData;
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GLfloat vVertices[] = { -0.5f, 0.5f, 0.0f, // Position 0
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0.0f, 0.0f, // TexCoord 0
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-0.5f, -0.5f, 0.0f, // Position 1
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0.0f, 1.0f, // TexCoord 1
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0.5f, -0.5f, 0.0f, // Position 2
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1.0f, 1.0f, // TexCoord 2
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0.5f, 0.5f, 0.0f, // Position 3
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1.0f, 0.0f // TexCoord 3
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};
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GLushort indices[] = { 0, 1, 2, 0, 2, 3 };
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// Set the viewport
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glViewport ( 0, 0, esContext->width, esContext->height );
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// Clear the color buffer
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glClear ( GL_COLOR_BUFFER_BIT );
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// Use the program object
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glUseProgram ( userData->programObject );
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// Load the vertex position
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glVertexAttribPointer ( userData->positionLoc, 3, GL_FLOAT,
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GL_FALSE, 5 * sizeof(GLfloat), vVertices );
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// Load the texture coordinate
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glVertexAttribPointer ( userData->texCoordLoc, 2, GL_FLOAT,
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GL_FALSE, 5 * sizeof(GLfloat), &vVertices[3] );
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glEnableVertexAttribArray ( userData->positionLoc );
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glEnableVertexAttribArray ( userData->texCoordLoc );
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// Bind the base map
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glActiveTexture ( GL_TEXTURE0 );
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glBindTexture ( GL_TEXTURE_2D, userData->baseMapTexId );
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// Set the base map sampler to texture unit to 0
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glUniform1i ( userData->baseMapLoc, 0 );
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// Bind the light map
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glActiveTexture ( GL_TEXTURE1 );
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glBindTexture ( GL_TEXTURE_2D, userData->lightMapTexId );
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// Set the light map sampler to texture unit 1
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glUniform1i ( userData->lightMapLoc, 1 );
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glDrawElements ( GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices );
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eglSwapBuffers ( esContext->eglDisplay, esContext->eglSurface );
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}
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///
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// Cleanup
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//
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void ShutDown ( ESContext *esContext )
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{
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UserData *userData = esContext->userData;
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// Delete texture object
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glDeleteTextures ( 1, &userData->baseMapTexId );
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glDeleteTextures ( 1, &userData->lightMapTexId );
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// Delete program object
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glDeleteProgram ( userData->programObject );
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}
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int main ( int argc, char *argv[] )
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{
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ESContext esContext;
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UserData userData;
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esInitContext ( &esContext );
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esContext.userData = &userData;
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esCreateWindow ( &esContext, "MultiTexture", 320, 240, ES_WINDOW_RGB );
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if ( !Init ( &esContext ) )
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return 0;
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esRegisterDrawFunc ( &esContext, Draw );
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esMainLoop ( &esContext );
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ShutDown ( &esContext );
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}

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