115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot/* 215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org> 315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot This software is provided 'as-is', without any express or implied 515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot warranty. In no event will the authors be held liable for any damages 615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot arising from the use of this software. 715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot Permission is granted to anyone to use this software for any purpose, 915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot including commercial applications, and to alter it and redistribute it 1015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot freely. 1115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot*/ 1215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot/* This is a simple example of using GLSL shaders with SDL */ 1315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 1415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot#include "SDL.h" 1515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 1615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot#ifdef HAVE_OPENGL 1715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 1815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot#include "SDL_opengl.h" 1915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 2015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 2115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robotstatic SDL_bool shaders_supported; 2215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robotstatic int current_shader = 0; 2315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 2415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robotenum { 2515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SHADER_COLOR, 2615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SHADER_TEXTURE, 2715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SHADER_TEXCOORDS, 2815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot NUM_SHADERS 2915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot}; 3015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 3115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robottypedef struct { 3215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot GLhandleARB program; 3315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot GLhandleARB vert_shader; 3415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot GLhandleARB frag_shader; 3515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot const char *vert_source; 3615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot const char *frag_source; 3715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot} ShaderData; 3815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 3915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robotstatic ShaderData shaders[NUM_SHADERS] = { 4015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 4115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* SHADER_COLOR */ 4215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot { 0, 0, 0, 4315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* vertex shader */ 4415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"varying vec4 v_color;\n" 4515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"\n" 4615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"void main()\n" 4715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"{\n" 4815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot" gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n" 4915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot" v_color = gl_Color;\n" 5015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"}", 5115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* fragment shader */ 5215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"varying vec4 v_color;\n" 5315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"\n" 5415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"void main()\n" 5515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"{\n" 5615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot" gl_FragColor = v_color;\n" 5715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"}" 5815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot }, 5915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 6015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* SHADER_TEXTURE */ 6115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot { 0, 0, 0, 6215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* vertex shader */ 6315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"varying vec4 v_color;\n" 6415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"varying vec2 v_texCoord;\n" 6515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"\n" 6615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"void main()\n" 6715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"{\n" 6815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot" gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n" 6915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot" v_color = gl_Color;\n" 7015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot" v_texCoord = vec2(gl_MultiTexCoord0);\n" 7115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"}", 7215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* fragment shader */ 7315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"varying vec4 v_color;\n" 7415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"varying vec2 v_texCoord;\n" 7515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"uniform sampler2D tex0;\n" 7615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"\n" 7715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"void main()\n" 7815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"{\n" 7915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot" gl_FragColor = texture2D(tex0, v_texCoord) * v_color;\n" 8015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"}" 8115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot }, 8215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 8315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* SHADER_TEXCOORDS */ 8415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot { 0, 0, 0, 8515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* vertex shader */ 8615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"varying vec2 v_texCoord;\n" 8715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"\n" 8815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"void main()\n" 8915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"{\n" 9015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot" gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n" 9115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot" v_texCoord = vec2(gl_MultiTexCoord0);\n" 9215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"}", 9315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* fragment shader */ 9415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"varying vec2 v_texCoord;\n" 9515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"\n" 9615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"void main()\n" 9715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"{\n" 9815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot" vec4 color;\n" 9915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot" vec2 delta;\n" 10015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot" float dist;\n" 10115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"\n" 10215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot" delta = vec2(0.5, 0.5) - v_texCoord;\n" 10315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot" dist = dot(delta, delta);\n" 10415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"\n" 10515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot" color.r = v_texCoord.x;\n" 10615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot" color.g = v_texCoord.x * v_texCoord.y;\n" 10715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot" color.b = v_texCoord.y;\n" 10815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot" color.a = 1.0 - (dist * 4.0);\n" 10915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot" gl_FragColor = color;\n" 11015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot"}" 11115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot }, 11215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot}; 11315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 11415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robotstatic PFNGLATTACHOBJECTARBPROC glAttachObjectARB; 11515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robotstatic PFNGLCOMPILESHADERARBPROC glCompileShaderARB; 11615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robotstatic PFNGLCREATEPROGRAMOBJECTARBPROC glCreateProgramObjectARB; 11715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robotstatic PFNGLCREATESHADEROBJECTARBPROC glCreateShaderObjectARB; 11815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robotstatic PFNGLDELETEOBJECTARBPROC glDeleteObjectARB; 11915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robotstatic PFNGLGETINFOLOGARBPROC glGetInfoLogARB; 12015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robotstatic PFNGLGETOBJECTPARAMETERIVARBPROC glGetObjectParameterivARB; 12115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robotstatic PFNGLGETUNIFORMLOCATIONARBPROC glGetUniformLocationARB; 12215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robotstatic PFNGLLINKPROGRAMARBPROC glLinkProgramARB; 12315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robotstatic PFNGLSHADERSOURCEARBPROC glShaderSourceARB; 12415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robotstatic PFNGLUNIFORM1IARBPROC glUniform1iARB; 12515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robotstatic PFNGLUSEPROGRAMOBJECTARBPROC glUseProgramObjectARB; 12615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 12715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robotstatic SDL_bool CompileShader(GLhandleARB shader, const char *source) 12815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot{ 12915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot GLint status; 13015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 13115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glShaderSourceARB(shader, 1, &source, NULL); 13215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glCompileShaderARB(shader); 13315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glGetObjectParameterivARB(shader, GL_OBJECT_COMPILE_STATUS_ARB, &status); 13415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot if (status == 0) { 13515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot GLint length; 13615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot char *info; 13715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 13815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glGetObjectParameterivARB(shader, GL_OBJECT_INFO_LOG_LENGTH_ARB, &length); 13915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot info = SDL_stack_alloc(char, length+1); 14015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glGetInfoLogARB(shader, length, NULL, info); 14115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Failed to compile shader:\n%s\n%s", source, info); 14215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_stack_free(info); 14315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 14415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot return SDL_FALSE; 14515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot } else { 14615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot return SDL_TRUE; 14715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot } 14815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot} 14915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 15015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robotstatic SDL_bool CompileShaderProgram(ShaderData *data) 15115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot{ 15215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot const int num_tmus_bound = 4; 15315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot int i; 15415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot GLint location; 15515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 15615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glGetError(); 15715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 15815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* Create one program object to rule them all */ 15915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot data->program = glCreateProgramObjectARB(); 16015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 16115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* Create the vertex shader */ 16215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot data->vert_shader = glCreateShaderObjectARB(GL_VERTEX_SHADER_ARB); 16315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot if (!CompileShader(data->vert_shader, data->vert_source)) { 16415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot return SDL_FALSE; 16515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot } 16615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 16715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* Create the fragment shader */ 16815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot data->frag_shader = glCreateShaderObjectARB(GL_FRAGMENT_SHADER_ARB); 16915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot if (!CompileShader(data->frag_shader, data->frag_source)) { 17015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot return SDL_FALSE; 17115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot } 17215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 17315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* ... and in the darkness bind them */ 17415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glAttachObjectARB(data->program, data->vert_shader); 17515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glAttachObjectARB(data->program, data->frag_shader); 17615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glLinkProgramARB(data->program); 17715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 17815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* Set up some uniform variables */ 17915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glUseProgramObjectARB(data->program); 18015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot for (i = 0; i < num_tmus_bound; ++i) { 18115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot char tex_name[5]; 18215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_snprintf(tex_name, SDL_arraysize(tex_name), "tex%d", i); 18315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot location = glGetUniformLocationARB(data->program, tex_name); 18415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot if (location >= 0) { 18515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glUniform1iARB(location, i); 18615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot } 18715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot } 18815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glUseProgramObjectARB(0); 18915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 19015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot return (glGetError() == GL_NO_ERROR) ? SDL_TRUE : SDL_FALSE; 19115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot} 19215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 19315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robotstatic void DestroyShaderProgram(ShaderData *data) 19415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot{ 19515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot if (shaders_supported) { 19615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glDeleteObjectARB(data->vert_shader); 19715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glDeleteObjectARB(data->frag_shader); 19815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glDeleteObjectARB(data->program); 19915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot } 20015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot} 20115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 20215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robotstatic SDL_bool InitShaders() 20315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot{ 20415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot int i; 20515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 20615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* Check for shader support */ 20715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot shaders_supported = SDL_FALSE; 20815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot if (SDL_GL_ExtensionSupported("GL_ARB_shader_objects") && 20915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_GL_ExtensionSupported("GL_ARB_shading_language_100") && 21015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_GL_ExtensionSupported("GL_ARB_vertex_shader") && 21115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_GL_ExtensionSupported("GL_ARB_fragment_shader")) { 21215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glAttachObjectARB = (PFNGLATTACHOBJECTARBPROC) SDL_GL_GetProcAddress("glAttachObjectARB"); 21315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glCompileShaderARB = (PFNGLCOMPILESHADERARBPROC) SDL_GL_GetProcAddress("glCompileShaderARB"); 21415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glCreateProgramObjectARB = (PFNGLCREATEPROGRAMOBJECTARBPROC) SDL_GL_GetProcAddress("glCreateProgramObjectARB"); 21515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glCreateShaderObjectARB = (PFNGLCREATESHADEROBJECTARBPROC) SDL_GL_GetProcAddress("glCreateShaderObjectARB"); 21615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glDeleteObjectARB = (PFNGLDELETEOBJECTARBPROC) SDL_GL_GetProcAddress("glDeleteObjectARB"); 21715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glGetInfoLogARB = (PFNGLGETINFOLOGARBPROC) SDL_GL_GetProcAddress("glGetInfoLogARB"); 21815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glGetObjectParameterivARB = (PFNGLGETOBJECTPARAMETERIVARBPROC) SDL_GL_GetProcAddress("glGetObjectParameterivARB"); 21915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glGetUniformLocationARB = (PFNGLGETUNIFORMLOCATIONARBPROC) SDL_GL_GetProcAddress("glGetUniformLocationARB"); 22015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glLinkProgramARB = (PFNGLLINKPROGRAMARBPROC) SDL_GL_GetProcAddress("glLinkProgramARB"); 22115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glShaderSourceARB = (PFNGLSHADERSOURCEARBPROC) SDL_GL_GetProcAddress("glShaderSourceARB"); 22215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glUniform1iARB = (PFNGLUNIFORM1IARBPROC) SDL_GL_GetProcAddress("glUniform1iARB"); 22315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glUseProgramObjectARB = (PFNGLUSEPROGRAMOBJECTARBPROC) SDL_GL_GetProcAddress("glUseProgramObjectARB"); 22415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot if (glAttachObjectARB && 22515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glCompileShaderARB && 22615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glCreateProgramObjectARB && 22715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glCreateShaderObjectARB && 22815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glDeleteObjectARB && 22915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glGetInfoLogARB && 23015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glGetObjectParameterivARB && 23115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glGetUniformLocationARB && 23215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glLinkProgramARB && 23315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glShaderSourceARB && 23415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glUniform1iARB && 23515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glUseProgramObjectARB) { 23615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot shaders_supported = SDL_TRUE; 23715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot } 23815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot } 23915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 24015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot if (!shaders_supported) { 24115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot return SDL_FALSE; 24215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot } 24315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 24415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* Compile all the shaders */ 24515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot for (i = 0; i < NUM_SHADERS; ++i) { 24615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot if (!CompileShaderProgram(&shaders[i])) { 24715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Unable to compile shader!\n"); 24815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot return SDL_FALSE; 24915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot } 25015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot } 25115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 25215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* We're done! */ 25315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot return SDL_TRUE; 25415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot} 25515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 25615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robotstatic void QuitShaders() 25715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot{ 25815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot int i; 25915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 26015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot for (i = 0; i < NUM_SHADERS; ++i) { 26115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot DestroyShaderProgram(&shaders[i]); 26215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot } 26315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot} 26415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 26515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot/* Quick utility function for texture creation */ 26615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robotstatic int 26715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robotpower_of_two(int input) 26815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot{ 26915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot int value = 1; 27015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 27115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot while (value < input) { 27215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot value <<= 1; 27315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot } 27415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot return value; 27515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot} 27615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 27715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team RobotGLuint 27815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team RobotSDL_GL_LoadTexture(SDL_Surface * surface, GLfloat * texcoord) 27915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot{ 28015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot GLuint texture; 28115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot int w, h; 28215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_Surface *image; 28315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_Rect area; 28415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_BlendMode saved_mode; 28515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 28615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* Use the surface width and height expanded to powers of 2 */ 28715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot w = power_of_two(surface->w); 28815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot h = power_of_two(surface->h); 28915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot texcoord[0] = 0.0f; /* Min X */ 29015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot texcoord[1] = 0.0f; /* Min Y */ 29115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot texcoord[2] = (GLfloat) surface->w / w; /* Max X */ 29215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot texcoord[3] = (GLfloat) surface->h / h; /* Max Y */ 29315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 29415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot image = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, 32, 29515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot#if SDL_BYTEORDER == SDL_LIL_ENDIAN /* OpenGL RGBA masks */ 29615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 0x000000FF, 29715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 0x0000FF00, 0x00FF0000, 0xFF000000 29815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot#else 29915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 0xFF000000, 30015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 0x00FF0000, 0x0000FF00, 0x000000FF 30115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot#endif 30215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot ); 30315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot if (image == NULL) { 30415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot return 0; 30515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot } 30615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 30715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* Save the alpha blending attributes */ 30815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_GetSurfaceBlendMode(surface, &saved_mode); 30915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_SetSurfaceBlendMode(surface, SDL_BLENDMODE_NONE); 31015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 31115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* Copy the surface into the GL texture image */ 31215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot area.x = 0; 31315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot area.y = 0; 31415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot area.w = surface->w; 31515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot area.h = surface->h; 31615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_BlitSurface(surface, &area, image, &area); 31715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 31815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* Restore the alpha blending attributes */ 31915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_SetSurfaceBlendMode(surface, saved_mode); 32015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 32115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* Create an OpenGL texture for the image */ 32215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glGenTextures(1, &texture); 32315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glBindTexture(GL_TEXTURE_2D, texture); 32415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); 32515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); 32615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glTexImage2D(GL_TEXTURE_2D, 32715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 0, 32815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, image->pixels); 32915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_FreeSurface(image); /* No longer needed */ 33015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 33115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot return texture; 33215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot} 33315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 33415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot/* A general OpenGL initialization function. Sets all of the initial parameters. */ 33515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robotvoid InitGL(int Width, int Height) /* We call this right after our OpenGL window is created. */ 33615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot{ 33715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot GLdouble aspect; 33815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 33915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glViewport(0, 0, Width, Height); 34015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glClearColor(0.0f, 0.0f, 0.0f, 0.0f); /* This Will Clear The Background Color To Black */ 34115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glClearDepth(1.0); /* Enables Clearing Of The Depth Buffer */ 34215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glDepthFunc(GL_LESS); /* The Type Of Depth Test To Do */ 34315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glEnable(GL_DEPTH_TEST); /* Enables Depth Testing */ 34415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glShadeModel(GL_SMOOTH); /* Enables Smooth Color Shading */ 34515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 34615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glMatrixMode(GL_PROJECTION); 34715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glLoadIdentity(); /* Reset The Projection Matrix */ 34815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 34915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot aspect = (GLdouble)Width / Height; 35015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glOrtho(-3.0, 3.0, -3.0 / aspect, 3.0 / aspect, 0.0, 1.0); 35115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 35215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glMatrixMode(GL_MODELVIEW); 35315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot} 35415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 35515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot/* The main drawing function. */ 35615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robotvoid DrawGLScene(SDL_Window *window, GLuint texture, GLfloat * texcoord) 35715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot{ 35815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* Texture coordinate lookup, to make it simple */ 35915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot enum { 36015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot MINX, 36115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot MINY, 36215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot MAXX, 36315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot MAXY 36415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot }; 36515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 36615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); /* Clear The Screen And The Depth Buffer */ 36715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glLoadIdentity(); /* Reset The View */ 36815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 36915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glTranslatef(-1.5f,0.0f,0.0f); /* Move Left 1.5 Units */ 37015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 37115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* draw a triangle (in smooth coloring mode) */ 37215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glBegin(GL_POLYGON); /* start drawing a polygon */ 37315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glColor3f(1.0f,0.0f,0.0f); /* Set The Color To Red */ 37415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glVertex3f( 0.0f, 1.0f, 0.0f); /* Top */ 37515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glColor3f(0.0f,1.0f,0.0f); /* Set The Color To Green */ 37615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glVertex3f( 1.0f,-1.0f, 0.0f); /* Bottom Right */ 37715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glColor3f(0.0f,0.0f,1.0f); /* Set The Color To Blue */ 37815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glVertex3f(-1.0f,-1.0f, 0.0f); /* Bottom Left */ 37915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glEnd(); /* we're done with the polygon (smooth color interpolation) */ 38015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 38115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glTranslatef(3.0f,0.0f,0.0f); /* Move Right 3 Units */ 38215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 38315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* Enable blending */ 38415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); 38515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glEnable(GL_BLEND); 38615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); 38715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 38815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* draw a textured square (quadrilateral) */ 38915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glEnable(GL_TEXTURE_2D); 39015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glBindTexture(GL_TEXTURE_2D, texture); 39115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glColor3f(1.0f,1.0f,1.0f); 39215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot if (shaders_supported) { 39315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glUseProgramObjectARB(shaders[current_shader].program); 39415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot } 39515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 39615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glBegin(GL_QUADS); /* start drawing a polygon (4 sided) */ 39715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glTexCoord2f(texcoord[MINX], texcoord[MINY]); 39815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glVertex3f(-1.0f, 1.0f, 0.0f); /* Top Left */ 39915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glTexCoord2f(texcoord[MAXX], texcoord[MINY]); 40015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glVertex3f( 1.0f, 1.0f, 0.0f); /* Top Right */ 40115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glTexCoord2f(texcoord[MAXX], texcoord[MAXY]); 40215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glVertex3f( 1.0f,-1.0f, 0.0f); /* Bottom Right */ 40315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glTexCoord2f(texcoord[MINX], texcoord[MAXY]); 40415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glVertex3f(-1.0f,-1.0f, 0.0f); /* Bottom Left */ 40515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glEnd(); /* done with the polygon */ 40615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 40715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot if (shaders_supported) { 40815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glUseProgramObjectARB(0); 40915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot } 41015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot glDisable(GL_TEXTURE_2D); 41115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 41215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* swap buffers to display, since we're double buffered. */ 41315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_GL_SwapWindow(window); 41415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot} 41515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 41615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robotint main(int argc, char **argv) 41715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot{ 41815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot int done; 41915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_Window *window; 42015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_Surface *surface; 42115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot GLuint texture; 42215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot GLfloat texcoords[4]; 42315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 42415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* Enable standard application logging */ 42515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO); 42615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 42715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* Initialize SDL for video output */ 42815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) { 42915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Unable to initialize SDL: %s\n", SDL_GetError()); 43015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot exit(1); 43115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot } 43215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 43315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* Create a 640x480 OpenGL screen */ 43415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot window = SDL_CreateWindow( "Shader Demo", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 640, 480, SDL_WINDOW_OPENGL ); 43515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot if ( !window ) { 43615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Unable to create OpenGL window: %s\n", SDL_GetError()); 43715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_Quit(); 43815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot exit(2); 43915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot } 44015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 44115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot if ( !SDL_GL_CreateContext(window)) { 44215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Unable to create OpenGL context: %s\n", SDL_GetError()); 44315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_Quit(); 44415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot exit(2); 44515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot } 44615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 44715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot surface = SDL_LoadBMP("icon.bmp"); 44815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot if ( ! surface ) { 44915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Unable to load icon.bmp: %s\n", SDL_GetError()); 45015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_Quit(); 45115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot exit(3); 45215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot } 45315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot texture = SDL_GL_LoadTexture(surface, texcoords); 45415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_FreeSurface(surface); 45515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 45615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* Loop, drawing and checking events */ 45715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot InitGL(640, 480); 45815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot if (InitShaders()) { 45915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_Log("Shaders supported, press SPACE to cycle them.\n"); 46015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot } else { 46115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Shaders not supported!\n"); 46215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot } 46315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot done = 0; 46415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot while ( ! done ) { 46515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot DrawGLScene(window, texture, texcoords); 46615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 46715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot /* This could go in a separate function */ 46815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot { SDL_Event event; 46915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot while ( SDL_PollEvent(&event) ) { 47015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot if ( event.type == SDL_QUIT ) { 47115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot done = 1; 47215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot } 47315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot if ( event.type == SDL_KEYDOWN ) { 47415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot if ( event.key.keysym.sym == SDLK_SPACE ) { 47515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot current_shader = (current_shader + 1) % NUM_SHADERS; 47615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot } 47715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot if ( event.key.keysym.sym == SDLK_ESCAPE ) { 47815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot done = 1; 47915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot } 48015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot } 48115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot } 48215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot } 48315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot } 48415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot QuitShaders(); 48515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_Quit(); 48615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot return 1; 48715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot} 48815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 48915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot#else /* HAVE_OPENGL */ 49015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 49115560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robotint 49215560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robotmain(int argc, char *argv[]) 49315560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot{ 49415560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "No OpenGL support on this system\n"); 49515560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot return 1; 49615560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot} 49715560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 49815560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot#endif /* HAVE_OPENGL */ 49915560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot 50015560bb32cdb9b47db48eb4865b736df9708a8fandroid-build-team Robot/* vi: set ts=4 sw=4 expandtab: */ 501