diff options
Diffstat (limited to 'third_party/gles2_book/Chapter_9/Simple_TextureCubemap/Simple_TextureCubemap.c')
| -rw-r--r-- | third_party/gles2_book/Chapter_9/Simple_TextureCubemap/Simple_TextureCubemap.c | 203 |
1 files changed, 0 insertions, 203 deletions
diff --git a/third_party/gles2_book/Chapter_9/Simple_TextureCubemap/Simple_TextureCubemap.c b/third_party/gles2_book/Chapter_9/Simple_TextureCubemap/Simple_TextureCubemap.c deleted file mode 100644 index c2c2da3fe4..0000000000 --- a/third_party/gles2_book/Chapter_9/Simple_TextureCubemap/Simple_TextureCubemap.c +++ /dev/null @@ -1,203 +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_TextureCubemap.c -// -// This is a simple example that draws a sphere with a cubemap image applied. -// -#include <stdlib.h> -#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] = - { - // Face 0 - Red - 255, 0, 0, - // Face 1 - Green, - 0, 255, 0, - // Face 3 - Blue - 0, 0, 255, - // Face 4 - Yellow - 255, 255, 0, - // Face 5 - Purple - 255, 0, 255, - // Face 6 - White - 255, 255, 255 - }; - - // Generate a texture object - glGenTextures ( 1, &textureId ); - - // Bind the texture object - glBindTexture ( GL_TEXTURE_CUBE_MAP, textureId ); - - // Load the cube face - Positive X - glTexImage2D ( GL_TEXTURE_CUBE_MAP_POSITIVE_X, 0, GL_RGB, 1, 1, 0, - GL_RGB, GL_UNSIGNED_BYTE, &cubePixels[0] ); - - // Load the cube face - Negative X - glTexImage2D ( GL_TEXTURE_CUBE_MAP_NEGATIVE_X, 0, GL_RGB, 1, 1, 0, - GL_RGB, GL_UNSIGNED_BYTE, &cubePixels[1] ); - - // Load the cube face - Positive Y - glTexImage2D ( GL_TEXTURE_CUBE_MAP_POSITIVE_Y, 0, GL_RGB, 1, 1, 0, - GL_RGB, GL_UNSIGNED_BYTE, &cubePixels[2] ); - - // Load the cube face - Negative Y - glTexImage2D ( GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, 0, GL_RGB, 1, 1, 0, - GL_RGB, GL_UNSIGNED_BYTE, &cubePixels[3] ); - - // Load the cube face - Positive Z - glTexImage2D ( GL_TEXTURE_CUBE_MAP_POSITIVE_Z, 0, GL_RGB, 1, 1, 0, - GL_RGB, GL_UNSIGNED_BYTE, &cubePixels[4] ); - - // Load the cube face - Negative Z - glTexImage2D ( GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, 0, GL_RGB, 1, 1, 0, - GL_RGB, GL_UNSIGNED_BYTE, &cubePixels[5] ); - - // Set the filtering mode - glTexParameteri ( GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_NEAREST ); - glTexParameteri ( GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_NEAREST ); - - return textureId; - -} - - -/// -// Initialize the shader and program object -// -int stcInit ( ESContext *esContext ) -{ - 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" - "{ \n" - " gl_Position = a_position; \n" - " v_normal = a_normal; \n" - "} \n"; - - GLbyte fShaderStr[] = - "precision mediump float; \n" - "varying vec3 v_normal; \n" - "uniform samplerCube s_texture; \n" - "void main() \n" - "{ \n" - " gl_FragColor = textureCube( s_texture, v_normal );\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->normalLoc = glGetAttribLocation ( userData->programObject, "a_normal" ); - - // Get the sampler locations - userData->samplerLoc = glGetUniformLocation ( userData->programObject, "s_texture" ); - - // Load the texture - userData->textureId = CreateSimpleTextureCubemap (); - - // Generate the vertex data - userData->numIndices = esGenSphere ( numSlices, 0.75f, &vertices, &normals, - NULL, &indices ); - glGenBuffers( 3, userData->vboIds ); - // Load vertex positions - glBindBuffer ( GL_ARRAY_BUFFER, userData->vboIds[0] ); - glBufferData ( GL_ARRAY_BUFFER, 3 * numVertices * sizeof(GLfloat), - vertices, GL_STATIC_DRAW ); - // Load vertex normals - glBindBuffer ( GL_ARRAY_BUFFER, userData->vboIds[1] ); - glBufferData ( GL_ARRAY_BUFFER, 3 * numVertices * sizeof(GLfloat), - normals, GL_STATIC_DRAW ); - // Load vertex indices - glBindBuffer ( GL_ELEMENT_ARRAY_BUFFER, userData->vboIds[2] ); - glBufferData ( GL_ELEMENT_ARRAY_BUFFER, userData->numIndices * sizeof(GLushort), - indices, GL_STATIC_DRAW ); - if ( vertices != NULL ) free ( vertices ); - 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 stcDraw ( ESContext *esContext ) -{ - 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 ); - - // Use the program object - glUseProgram ( userData->programObject ); - - // Load the vertex position - glVertexAttribPointer ( userData->positionLoc, 3, GL_FLOAT, - GL_FALSE, 0, 0 ); - // Load the normal - glVertexAttribPointer ( userData->normalLoc, 3, GL_FLOAT, - GL_FALSE, 0, 0 ); - - glEnableVertexAttribArray ( userData->positionLoc ); - glEnableVertexAttribArray ( userData->normalLoc ); - - // 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 ); -} - -/// -// Cleanup -// -void stcShutDown ( ESContext *esContext ) -{ - 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 ); -} |