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Diffstat (limited to 'chromium/third_party/angle/samples/gles2_book/Simple_VertexShader/Simple_VertexShader.c')
| -rw-r--r-- | chromium/third_party/angle/samples/gles2_book/Simple_VertexShader/Simple_VertexShader.c | 194 |
1 files changed, 0 insertions, 194 deletions
diff --git a/chromium/third_party/angle/samples/gles2_book/Simple_VertexShader/Simple_VertexShader.c b/chromium/third_party/angle/samples/gles2_book/Simple_VertexShader/Simple_VertexShader.c deleted file mode 100644 index df5c98d612f..00000000000 --- a/chromium/third_party/angle/samples/gles2_book/Simple_VertexShader/Simple_VertexShader.c +++ /dev/null @@ -1,194 +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_VertexShader.c -// -// This is a simple example that draws a rotating cube in perspective -// using a vertex shader to transform the object -// -#include <stdlib.h> -#include "esUtil.h" - -typedef struct -{ - // Handle to a program object - GLuint programObject; - - // Attribute locations - GLint positionLoc; - - // Uniform locations - GLint mvpLoc; - - // Vertex daata - GLfloat *vertices; - GLushort *indices; - int numIndices; - - // Rotation angle - GLfloat angle; - - // MVP matrix - ESMatrix mvpMatrix; -} UserData; - -/// -// Initialize the shader and program object -// -int Init ( ESContext *esContext ) -{ - UserData *userData = esContext->userData; - GLbyte vShaderStr[] = - "uniform mat4 u_mvpMatrix; \n" - "attribute vec4 a_position; \n" - "void main() \n" - "{ \n" - " gl_Position = u_mvpMatrix * a_position; \n" - "} \n"; - - GLbyte fShaderStr[] = - "precision mediump float; \n" - "void main() \n" - "{ \n" - " gl_FragColor = vec4( 1.0, 0.0, 0.0, 1.0 ); \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 uniform locations - userData->mvpLoc = glGetUniformLocation( userData->programObject, "u_mvpMatrix" ); - - // Generate the vertex data - userData->numIndices = esGenCube( 1.0, &userData->vertices, - NULL, NULL, &userData->indices ); - - // Starting rotation angle for the cube - userData->angle = 45.0f; - - glClearColor ( 0.0f, 0.0f, 0.0f, 0.0f ); - return TRUE; -} - - -/// -// Update MVP matrix based on time -// -void Update ( ESContext *esContext, float deltaTime ) -{ - UserData *userData = (UserData*) esContext->userData; - ESMatrix perspective; - ESMatrix modelview; - float aspect; - - // Compute a rotation angle based on time to rotate the cube - userData->angle += ( deltaTime * 40.0f ); - if( userData->angle >= 360.0f ) - userData->angle -= 360.0f; - - // Compute the window aspect ratio - aspect = (GLfloat) esContext->width / (GLfloat) esContext->height; - - // Generate a perspective matrix with a 60 degree FOV - esMatrixLoadIdentity( &perspective ); - esPerspective( &perspective, 60.0f, aspect, 1.0f, 20.0f ); - - // Generate a model view matrix to rotate/translate the cube - esMatrixLoadIdentity( &modelview ); - - // Translate away from the viewer - esTranslate( &modelview, 0.0, 0.0, -2.0 ); - - // Rotate the cube - esRotate( &modelview, userData->angle, 1.0, 0.0, 1.0 ); - - // Compute the final MVP by multiplying the - // modevleiw and perspective matrices together - esMatrixMultiply( &userData->mvpMatrix, &modelview, &perspective ); -} - -/// -// Draw a triangle using the shader pair created in Init() -// -void Draw ( ESContext *esContext ) -{ - UserData *userData = esContext->userData; - - // 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, 3 * sizeof(GLfloat), userData->vertices ); - - glEnableVertexAttribArray ( userData->positionLoc ); - - - // Load the MVP matrix - glUniformMatrix4fv( userData->mvpLoc, 1, GL_FALSE, (GLfloat*) &userData->mvpMatrix.m[0][0] ); - - // Draw the cube - glDrawElements ( GL_TRIANGLES, userData->numIndices, GL_UNSIGNED_SHORT, userData->indices ); - - eglSwapBuffers ( esContext->eglDisplay, esContext->eglSurface ); -} - -/// -// Cleanup -// -void ShutDown ( ESContext *esContext ) -{ - UserData *userData = esContext->userData; - - if ( userData->vertices != NULL ) - { - free ( userData->vertices ); - } - - if ( userData->indices != NULL ) - { - free ( userData->indices ); - } - - // 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 Vertex Shader"), 320, 240, ES_WINDOW_RGB ); - - if ( !Init ( &esContext ) ) - return 0; - - esRegisterDrawFunc ( &esContext, Draw ); - esRegisterUpdateFunc ( &esContext, Update ); - - esMainLoop ( &esContext ); - - ShutDown ( &esContext ); -} |