Attachment 75019 Details for Bug 61036 – Shader test program

Shader test program

shader1.c (text/plain), 3.63 KB, created by Brian Crowell on 2013-02-18 03:39:02 UTC

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Creator: Brian Crowell

Created: 2013-02-18 03:39:02 UTC

Size: 3.63 KB

patch

obsolete

>#include <stdio.h>
>#include <GL/glew.h>
>#include <GL/gl.h>
>#include <GL/glx.h>
>
>static const char *vertex_shader_text =
>"#version 120\n"
>"#extension GL_ARB_texture_rectangle : require\n"
>"uniform ivec2 tex_offset[8];\n"
>"uniform sampler2DRect input_texture[8];\n"
>"uniform int input_count;\n"
>"uniform ivec2 frame_size;\n"
>"uniform ivec2 frame_offset;\n"
>"attribute vec2 position;\n"
>"varying vec2 tex_coord[8];\n"
>"varying vec2 frame_coord;\n"
>"\n"
>"void main() {\n"
>"    gl_Position = vec4(position * vec2(2.0, 2.0) + vec2(-1.0, -1.0), 0.0, 1.0);\n"
>"    frame_coord = position * vec2(frame_size) + frame_offset;\n"
>"\n"
>"    for( int i = 0; i < input_count; i++ ) {\n"
>"        tex_coord[i] = position * vec2(frame_size) + frame_offset + tex_offset[i];\n"
>"    }\n"
>"}\n";
>
>static const char *gain_offset_shader_text =
>"#version 120\n"
>"#extension GL_ARB_texture_rectangle : enable\n"
>"uniform sampler2DRect input_texture[8];\n"
>"varying vec2 tex_coord[8];\n"
>"uniform float gain, offset;"
>""
>"void main() {"
>"    vec4 color = texture2DRect( input_texture[0], tex_coord[0] );"
>""
>"    gl_FragColor = color * vec4(gain, gain, gain, 1.0)"
>"        + vec4(offset, offset, offset, 0.0);"
>"}";
>
>int
>main( int argc, char *argv[]) {
>    Display *display;
>    int fb_attrs[] = {
>        GLX_DRAWABLE_TYPE, GLX_PBUFFER_BIT, None };
>    int pbuf_attrs[] = { GLX_PBUFFER_WIDTH, 8, GLX_PBUFFER_HEIGHT, 8, GLX_PRESERVED_CONTENTS, False, None };
>    int config_count = 0;
>    GLXFBConfig *configs;
>    GLXContext new_context;
>    GLXPbuffer pbuf;
>
>    printf( "Opening X display...\n" );
>    display = XOpenDisplay( NULL );
>
>    if( !display ) {
>        printf( "Could not open X display.\n" );
>        return -1;
>    }
>
>    printf( "Choosing framebuffer config\n" );
>    configs = glXChooseFBConfig(
>        display, DefaultScreen( display ), fb_attrs, &config_count );
>
>    if( !config_count ) {
>        printf( "No frame buffer configurations available. Which is weird.\n" );
>        return -1;
>    }
>
>    new_context = glXCreateNewContext(
>        display, configs[0], GLX_RGBA_TYPE, NULL, True );
>
>    if( !new_context ) {
>        printf( "Failed to create context.\n" );
>        return -1;
>    }
>
>    pbuf = glXCreatePbuffer( display, configs[0], pbuf_attrs );
>
>    if( pbuf == None ) {
>        printf( "Failed to create XGL pixel buffer.\n" );
>        return -1;
>    }
>
>    if( !glXMakeContextCurrent( display,
>        pbuf,
>        pbuf,
>        new_context ) ) {
>        printf( "Failed to set context current.\n" );
>        return -1;
>    }
>
>    glewInit();
>
>    GLuint vbuf;
>    glGenBuffers( 1, &vbuf );
>
>    float positions[] = {
>        0.0f, 0.0f,
>        1.0f, 0.0f,
>        1.0f, 1.0f,
>        0.0f, 1.0f
>    };
>
>    glBindBuffer( GL_ARRAY_BUFFER, vbuf );
>    glBufferData( GL_ARRAY_BUFFER, sizeof(positions), positions, GL_STATIC_DRAW );
>
>    GLuint vshader = glCreateShader( GL_VERTEX_SHADER );
>    glShaderSource( vshader, 1, &vertex_shader_text, NULL );
>    glCompileShader( vshader );
>
>    GLuint fshader = glCreateShader( GL_FRAGMENT_SHADER );
>    glShaderSource( fshader, 1, &gain_offset_shader_text, NULL );
>    glCompileShader( fshader );
>
>    GLuint program = glCreateProgram();
>    glAttachShader( program, vshader );
>    glAttachShader( program, fshader );
>    glLinkProgram( program );
>
>    glUseProgram( program );
>
>    GLuint position_attribute = glGetAttribLocation( program, "position" );
>
>    glEnableVertexAttribArray( position_attribute );
>    glVertexAttribPointer( position_attribute, 2, GL_FLOAT, GL_FALSE, 0, 0 );
>
>    glDrawArrays( GL_TRIANGLE_FAN, 0, 4 );
>
>    glXDestroyPbuffer( display, pbuf );
>    glXDestroyContext( display, new_context );
>    printf( "Success\n" );
>    return 0;
>}

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Attachments on bug 61036: 75019 | 75025 | 75081

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