OpenGL ES 2.0 Development in Visual Studio 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 // // Hello_Triangle.c // // This is a simple example that draws a single triangle with // a minimal vertex/fragment shader. The purpose of this // example is to demonstrate the basic concepts of // OpenGL ES 2.0 rendering. #include <stdlib.h> #include "esUtil.h" typedef struct { // Handle to a program object GLuint programObject; } UserData; /// // Create a shader object, load the shader source, and // compile the shader. // GLuint LoadShader ( GLenum type, const char *shaderSrc ) { GLuint shader; GLint compiled; // Create the shader object shader = glCreateShader ( type ); if ( shader == 0 ) return 0; // Load the shader source glShaderSource ( shader, 1, &shaderSrc, NULL ); // Compile the shader glCompileShader ( shader ); // Check the compile status glGetShaderiv ( shader, GL_COMPILE_STATUS, &compiled ); if ( !compiled ) { GLint infoLen = 0; glGetShaderiv ( shader, GL_INFO_LOG_LENGTH, &infoLen ); if ( infoLen > 1 ) { char* infoLog = malloc (sizeof(char) * infoLen ); glGetShaderInfoLog ( shader, infoLen, NULL, infoLog ); esLogMessage ( "Error compiling shader:\n%s\n", infoLog ); free ( infoLog ); } glDeleteShader ( shader ); return 0; } return shader; } /// // Initialize the shader and program object // int Init ( ESContext *esContext ) { UserData *userData = esContext->userData; GLbyte vShaderStr[] = "attribute vec4 vPosition; \n" "void main() \n" "{ \n" " gl_Position = vPosition; \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"; GLuint vertexShader; GLuint fragmentShader; GLuint programObject; GLint linked; // Load the vertex/fragment shaders vertexShader = LoadShader ( GL_VERTEX_SHADER, vShaderStr ); fragmentShader = LoadShader ( GL_FRAGMENT_SHADER, fShaderStr ); // Create the program object programObject = glCreateProgram ( ); if ( programObject == 0 ) return 0; glAttachShader ( programObject, vertexShader ); glAttachShader ( programObject, fragmentShader ); // Bind vPosition to attribute 0 glBindAttribLocation ( programObject, 0, "vPosition" ); // Link the program glLinkProgram ( programObject ); // Check the link status glGetProgramiv ( programObject, GL_LINK_STATUS, &linked ); if ( !linked ) { GLint infoLen = 0; glGetProgramiv ( programObject, GL_INFO_LOG_LENGTH, &infoLen ); if ( infoLen > 1 ) { char* infoLog = malloc (sizeof(char) * infoLen ); glGetProgramInfoLog ( programObject, infoLen, NULL, infoLog ); esLogMessage ( "Error linking program:\n%s\n", infoLog ); free ( infoLog ); } glDeleteProgram ( programObject ); return FALSE; } // Store the program object userData->programObject = programObject; 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 ) { UserData *userData = esContext->userData; GLfloat vVertices[] = { 0.0f, 0.5f, 0.0f, -0.5f, -0.5f, 0.0f, 0.5f, -0.5f, 0.0f }; // 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 data glVertexAttribPointer ( 0, 3, GL_FLOAT, GL_FALSE, 0, vVertices ); glEnableVertexAttribArray ( 0 ); glDrawArrays ( GL_TRIANGLES, 0, 3 ); eglSwapBuffers ( esContext->eglDisplay, esContext->eglSurface ); } int main ( int argc, char *argv[] ) { ESContext esContext; UserData userData; esInitContext ( &esContext ); esContext.userData = &userData; esCreateWindow ( &esContext, TEXT("Hello Triangle"), 320, 240, ES_WINDOW_RGB ); if ( !Init ( &esContext ) ) return 0; esRegisterDrawFunc ( &esContext, Draw ); esMainLoop ( &esContext ); }