Renamed gles_book_examples to gles2_book to make it shorter and more correct....

third_party/gles_book_examples/Chapter_11/Stencil_Test/Stencil_Test.c

Index: third_party/gles_book_examples/Chapter_11/Stencil_Test/Stencil_Test.c
===================================================================
--- third_party/gles_book_examples/Chapter_11/Stencil_Test/Stencil_Test.c	(revision 35873)
+++ third_party/gles_book_examples/Chapter_11/Stencil_Test/Stencil_Test.c	(working copy)
@@ -1,273 +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
-//
-
-// Stencil_Test.c
-//
-//    This example shows various stencil buffer
-//    operations.
-//
-#include <stdlib.h>
-#include "esUtil.h"
-
-typedef struct
-{
-   // Handle to a program object
-   GLuint programObject;
-
-   // Attribute locations
-   GLint  positionLoc;
-
-   // Uniform locations
-   GLint  colorLoc;
-
-} UserData;
-
-///
-// Initialize the shader and program object
-//
-int Init ( ESContext *esContext )
-{
-   UserData *userData = esContext->userData;
-   GLbyte vShaderStr[] =  
-      "attribute vec4 a_position;   \n"
-      "void main()                  \n"
-      "{                            \n"
-      "   gl_Position = a_position; \n"
-      "}                            \n";
-   
-   GLbyte fShaderStr[] =  
-      "precision mediump float;  \n"
-      "uniform vec4  u_color;    \n"
-      "void main()               \n"
-      "{                         \n"
-      "  gl_FragColor = u_color; \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" );
-   
-   // Get the sampler location
-   userData->colorLoc = glGetUniformLocation ( userData->programObject, "u_color" );
-
-   // Set the clear color
-   glClearColor ( 0.0f, 0.0f, 0.0f, 0.0f );
-   
-   // Set the stencil clear value
-   glClearStencil ( 0x1 );
-
-   // Set the depth clear value
-   glClearDepthf( 0.75f );
-
-   // Enable the depth and stencil tests
-   glEnable( GL_DEPTH_TEST );
-   glEnable( GL_STENCIL_TEST );
-
-   return TRUE;
-}
-
-///
-// Initialize the stencil buffer values, and then use those
-//   values to control rendering
-//
-void Draw ( ESContext *esContext )
-{
-   int  i;
-
-   UserData *userData = esContext->userData;
-
-   GLfloat vVertices[] = { 
-       -0.75f,  0.25f,  0.50f, // Quad #0
-       -0.25f,  0.25f,  0.50f,
-       -0.25f,  0.75f,  0.50f,
-       -0.75f,  0.75f,  0.50f,
-	    0.25f,  0.25f,  0.90f, // Quad #1
-		0.75f,  0.25f,  0.90f,
-		0.75f,  0.75f,  0.90f,
-		0.25f,  0.75f,  0.90f,
-	   -0.75f, -0.75f,  0.50f, // Quad #2
-       -0.25f, -0.75f,  0.50f,
-       -0.25f, -0.25f,  0.50f,
-       -0.75f, -0.25f,  0.50f,
-        0.25f, -0.75f,  0.50f, // Quad #3
-        0.75f, -0.75f,  0.50f,
-        0.75f, -0.25f,  0.50f,
-        0.25f, -0.25f,  0.50f,
-       -1.00f, -1.00f,  0.00f, // Big Quad
-        1.00f, -1.00f,  0.00f,
-        1.00f,  1.00f,  0.00f,
-       -1.00f,  1.00f,  0.00f
-   };
-
-   GLubyte indices[][6] = { 
-       {  0,  1,  2,  0,  2,  3 }, // Quad #0
-       {  4,  5,  6,  4,  6,  7 }, // Quad #1
-       {  8,  9, 10,  8, 10, 11 }, // Quad #2
-       { 12, 13, 14, 12, 14, 15 }, // Quad #3
-       { 16, 17, 18, 16, 18, 19 }  // Big Quad
-   };
-   
-#define NumTests  4
-   GLfloat  colors[NumTests][4] = { 
-       { 1.0f, 0.0f, 0.0f, 1.0f },
-       { 0.0f, 1.0f, 0.0f, 1.0f },
-       { 0.0f, 0.0f, 1.0f, 1.0f },
-       { 1.0f, 1.0f, 0.0f, 0.0f }
-   };
-
-   GLint   numStencilBits;
-   GLuint  stencilValues[NumTests] = { 
-      0x7, // Result of test 0
-      0x0, // Result of test 1
-      0x2, // Result of test 2
-      0xff // Result of test 3.  We need to fill this
-           //  value in a run-time
-   };
-
-   // Set the viewport
-   glViewport ( 0, 0, esContext->width, esContext->height );
-   
-   // Clear the color, depth, and stencil buffers.  At this
-   //   point, the stencil buffer will be 0x1 for all pixels
-   glClear ( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT );
-
-   // Use the program object
-   glUseProgram ( userData->programObject );
-
-   // Load the vertex position
-   glVertexAttribPointer ( userData->positionLoc, 3, GL_FLOAT, 
-                           GL_FALSE, 0, vVertices );
-  
-   glEnableVertexAttribArray ( userData->positionLoc );
-
-   // Test 0:
-   //
-   // Initialize upper-left region.  In this case, the
-   //   stencil-buffer values will be replaced because the
-   //   stencil test for the rendered pixels will fail the
-   //   stencil test, which is
-   //
-   //        ref   mask   stencil  mask
-   //      ( 0x7 & 0x3 ) < ( 0x1 & 0x7 )
-   //
-   //   The value in the stencil buffer for these pixels will
-   //   be 0x7.
-   //
-   glStencilFunc( GL_LESS, 0x7, 0x3 );
-   glStencilOp( GL_REPLACE, GL_DECR, GL_DECR );
-   glDrawElements( GL_TRIANGLES, 6, GL_UNSIGNED_BYTE, indices[0] );
- 
-   // Test 1:
-   //
-   // Initialize the upper-right region.  Here, we'll decrement
-   //   the stencil-buffer values where the stencil test passes
-   //   but the depth test fails.  The stencil test is
-   //
-   //        ref  mask    stencil  mask
-   //      ( 0x3 & 0x3 ) > ( 0x1 & 0x3 )
-   //
-   //    but where the geometry fails the depth test.  The
-   //    stencil values for these pixels will be 0x0.
-   //
-   glStencilFunc( GL_GREATER, 0x3, 0x3 );
-   glStencilOp( GL_KEEP, GL_DECR, GL_KEEP );
-   glDrawElements( GL_TRIANGLES, 6, GL_UNSIGNED_BYTE, indices[1] );
-
-   // Test 2:
-   //
-   // Initialize the lower-left region.  Here we'll increment 
-   //   (with saturation) the stencil value where both the
-   //   stencil and depth tests pass.  The stencil test for
-   //   these pixels will be
-   //
-   //        ref  mask     stencil  mask
-   //      ( 0x1 & 0x3 ) == ( 0x1 & 0x3 )
-   //
-   //   The stencil values for these pixels will be 0x2.
-   //
-   glStencilFunc( GL_EQUAL, 0x1, 0x3 );
-   glStencilOp( GL_KEEP, GL_INCR, GL_INCR );
-   glDrawElements( GL_TRIANGLES, 6, GL_UNSIGNED_BYTE, indices[2] );
-
-   // Test 3:
-   //
-   // Finally, initialize the lower-right region.  We'll invert
-   //   the stencil value where the stencil tests fails.  The
-   //   stencil test for these pixels will be
-   //
-   //        ref   mask    stencil  mask
-   //      ( 0x2 & 0x1 ) == ( 0x1 & 0x1 )
-   //
-   //   The stencil value here will be set to ~((2^s-1) & 0x1),
-   //   (with the 0x1 being from the stencil clear value),
-   //   where 's' is the number of bits in the stencil buffer
-   //
-   glStencilFunc( GL_EQUAL, 0x2, 0x1 );
-   glStencilOp( GL_INVERT, GL_KEEP, GL_KEEP );
-   glDrawElements( GL_TRIANGLES, 6, GL_UNSIGNED_BYTE, indices[3] );
-   
-   // Since we don't know at compile time how many stecil bits are present,
-   //   we'll query, and update the value correct value in the
-   //   stencilValues arrays for the fourth tests.  We'll use this value
-   //   later in rendering.
-   glGetIntegerv( GL_STENCIL_BITS, &numStencilBits );
-   
-   stencilValues[3] = ~(((1 << numStencilBits) - 1) & 0x1) & 0xff;
-
-   // Use the stencil buffer for controlling where rendering will
-   //   occur.  We diable writing to the stencil buffer so we
-   //   can test against them without modifying the values we
-   //   generated.
-   glStencilMask( 0x0 );
-   
-   for ( i = 0; i < NumTests; ++i )
-   {
-      glStencilFunc( GL_EQUAL, stencilValues[i], 0xff );
-      glUniform4fv( userData->colorLoc, 1, colors[i] );
-      glDrawElements( GL_TRIANGLES, 6, GL_UNSIGNED_BYTE, indices[4] );
-   }
-
-   eglSwapBuffers ( esContext->eglDisplay, esContext->eglSurface );
-}
-
-///
-// Cleanup
-//
-void ShutDown ( ESContext *esContext )
-{
-   UserData *userData = esContext->userData;
-
-   // Delete program object
-   glDeleteProgram ( userData->programObject );
-}
-
-
-int main ( int argc, char *argv[] )
-{
-   ESContext esContext;
-   UserData  userData;
-
-   esInitContext ( &esContext );
-   esContext.userData = &userData;
-
-   esCreateWindow ( &esContext, "Stencil Test", 320, 240,
-                    ES_WINDOW_RGB | ES_WINDOW_DEPTH | ES_WINDOW_STENCIL );
-   
-   if ( !Init ( &esContext ) )
-      return 0;
-
-   esRegisterDrawFunc ( &esContext, Draw );
-   
-   esMainLoop ( &esContext );
-
-   ShutDown ( &esContext );
-}