Added cubemap demo.

third_party/gles2_book/Chapter_9/Simple_TextureCubemap/Simple_TextureCubemap.c

 //
 // 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_TextureCubemap.c
 //
 //    This is a simple example that draws a sphere with a cubemap image applied.
 //
 #include <stdlib.h>
-#include "esUtil.h"
-
-typedef struct
-{
-   // Handle to a program object
-   GLuint programObject;
-
-   // Attribute locations
-   GLint  positionLoc;
-   GLint  normalLoc;
-
-   // Sampler location
-   GLint samplerLoc;
-
-   // Texture handle
-   GLuint textureId;
-
-   // Vertex data
-   int    numIndices;
-   GLuint vboIds[3];
-} UserData;
+#include "Simple_TextureCubemap.h"
 
 ///
 // Create a simple cubemap with a 1x1 face with a different
 // color for each face
 static GLuint CreateSimpleTextureCubemap( )
 {
    GLuint textureId;
    // Six 1x1 RGB faces
    GLubyte cubePixels[6][3] =
    {
@@ skipping 46 matching lines @@
    glTexParameteri ( GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
 
    return textureId;
 
 }
 
 
 ///
 // Initialize the shader and program object
 //
-int Init ( ESContext *esContext )
+int stcInit ( ESContext *esContext )
 {
-   UserData *userData = esContext->userData;
+   STCUserData *userData = esContext->userData;
    int numSlices = 20;
    int numVertices = ( (numSlices / 2) + 1 ) * ( numSlices + 1 );
    GLfloat *vertices = NULL;
    GLfloat *normals = NULL;
    GLushort *indices = NULL;
    GLbyte vShaderStr[] =  
       "attribute vec4 a_position;   \n"
       "attribute vec3 a_normal;     \n"
       "varying vec3 v_normal;       \n"
       "void main()                  \n"
@@ skipping 44 matching lines @@
    if ( normals != NULL ) free ( normals );
    if ( indices != NULL ) free ( indices );
    
    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 )
+void stcDraw ( ESContext *esContext )
 {
-   UserData *userData = esContext->userData;
+   STCUserData *userData = esContext->userData;
       
    // Set the viewport
    glViewport ( 0, 0, esContext->width, esContext->height );
    
    // Clear the color buffer
    glClear ( GL_COLOR_BUFFER_BIT );
 
    
    glCullFace ( GL_BACK );
    glEnable ( GL_CULL_FACE );
@@ skipping 13 matching lines @@
 
    // Bind the texture
    glActiveTexture ( GL_TEXTURE0 );
    glBindTexture ( GL_TEXTURE_CUBE_MAP, userData->textureId );
 
    // Set the sampler texture unit to 0
    glUniform1i ( userData->samplerLoc, 0 );
 
    glDrawElements ( GL_TRIANGLES, userData->numIndices, 
                     GL_UNSIGNED_SHORT, 0 );
-
-   eglSwapBuffers ( esContext->eglDisplay, esContext->eglSurface );
 }
 
 ///
 // Cleanup
 //
-void ShutDown ( ESContext *esContext )
+void stcShutDown ( ESContext *esContext )
 {
-   UserData *userData = esContext->userData;
+   STCUserData *userData = esContext->userData;
 
    // Delete texture object
    glDeleteTextures ( 1, &userData->textureId );
 
    // Delete program object
    glDeleteProgram ( userData->programObject );
 
    // Delete vertex buffer objects
    glDeleteBuffers ( 3, userData->vboIds );
 }
-
-
-int main ( int argc, char *argv[] )
-{
-   ESContext esContext;
-   UserData  userData;
-
-   esInitContext ( &esContext );
-   esContext.userData = &userData;
-
-   esCreateWindow ( &esContext, "Simple Texture Cubemap", 320, 240, ES_WINDOW_RGB );
-   
-   if ( !Init ( &esContext ) )
-      return 0;
-
-   esRegisterDrawFunc ( &esContext, Draw );
-   
-   esMainLoop ( &esContext );
-
-   ShutDown ( &esContext );
-}