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annotate src/render/opengl/SDL_shaders_gl.c @ 5267:b530ef003506

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Happy 2011! :)
author Sam Lantinga <slouken@libsdl.org>
date Fri, 11 Feb 2011 22:37:15 -0800
parents c0e9d3897a85
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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b530ef003506 Happy 2011! :)
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3 Copyright (C) 1997-2011 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #if SDL_VIDEO_RENDER_OGL && !SDL_RENDER_DISABLED
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25
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26 #include "SDL_stdinc.h"
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27 #include "SDL_log.h"
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28 #include "SDL_opengl.h"
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29 #include "SDL_video.h"
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30 #include "SDL_shaders_gl.h"
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31
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32 /* OpenGL shader implementation */
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33
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34 /*#define DEBUG_SHADERS*/
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35
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36 typedef struct
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37 {
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38 GLenum program;
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39 GLenum vert_shader;
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40 GLenum frag_shader;
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41 } GL_ShaderData;
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42
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43 struct GL_ShaderContext
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44 {
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45 GLenum (*glGetError)(void);
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46
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47 PFNGLATTACHOBJECTARBPROC glAttachObjectARB;
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48 PFNGLCOMPILESHADERARBPROC glCompileShaderARB;
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49 PFNGLCREATEPROGRAMOBJECTARBPROC glCreateProgramObjectARB;
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50 PFNGLCREATESHADEROBJECTARBPROC glCreateShaderObjectARB;
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51 PFNGLDELETEOBJECTARBPROC glDeleteObjectARB;
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52 PFNGLGETINFOLOGARBPROC glGetInfoLogARB;
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53 PFNGLGETOBJECTPARAMETERIVARBPROC glGetObjectParameterivARB;
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54 PFNGLGETUNIFORMLOCATIONARBPROC glGetUniformLocationARB;
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55 PFNGLLINKPROGRAMARBPROC glLinkProgramARB;
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56 PFNGLSHADERSOURCEARBPROC glShaderSourceARB;
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57 PFNGLUNIFORM1IARBPROC glUniform1iARB;
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58 PFNGLUNIFORM1FARBPROC glUniform1fARB;
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59 PFNGLUSEPROGRAMOBJECTARBPROC glUseProgramObjectARB;
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60
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61 SDL_bool GL_ARB_texture_rectangle_supported;
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62
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63 GL_Shader current_shader;
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64 GL_ShaderData shaders[NUM_SHADERS];
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65 };
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66
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67 /*
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68 * NOTE: Always use sampler2D, etc here. We'll #define them to the
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69 * texture_rectangle versions if we choose to use that extension.
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70 */
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71 static const char *shader_source[NUM_SHADERS][2] =
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72 {
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73 /* SHADER_NONE */
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74 { NULL, NULL },
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75
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76 /* SHADER_SOLID */
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77 {
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78 /* vertex shader */
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79 "varying vec4 v_color;\n"
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80 "\n"
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81 "void main()\n"
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82 "{\n"
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83 " gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
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84 " v_color = gl_Color;\n"
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85 "}",
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86 /* fragment shader */
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87 "varying vec4 v_color;\n"
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88 "\n"
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89 "void main()\n"
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90 "{\n"
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91 " gl_FragColor = v_color;\n"
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92 "}"
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93 },
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94
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95 /* SHADER_RGB */
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96 {
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97 /* vertex shader */
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98 "varying vec4 v_color;\n"
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99 "varying vec2 v_texCoord;\n"
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100 "\n"
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101 "void main()\n"
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102 "{\n"
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103 " gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
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104 " v_color = gl_Color;\n"
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105 " v_texCoord = vec2(gl_MultiTexCoord0);\n"
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106 "}",
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107 /* fragment shader */
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108 "varying vec4 v_color;\n"
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109 "varying vec2 v_texCoord;\n"
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110 "uniform sampler2D tex0;\n"
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111 "\n"
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112 "void main()\n"
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113 "{\n"
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114 " gl_FragColor = texture2D(tex0, v_texCoord) * v_color;\n"
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115 "}"
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116 },
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117
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118 /* SHADER_YV12 */
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119 {
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120 /* vertex shader */
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121 "varying vec4 v_color;\n"
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122 "varying vec2 v_texCoord;\n"
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123 "\n"
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124 "void main()\n"
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125 "{\n"
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126 " gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
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127 " v_color = gl_Color;\n"
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128 " v_texCoord = vec2(gl_MultiTexCoord0);\n"
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129 "}",
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130 /* fragment shader */
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131 "varying vec4 v_color;\n"
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132 "varying vec2 v_texCoord;\n"
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133 "uniform sampler2D tex0; // Y \n"
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134 "uniform sampler2D tex1; // U \n"
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135 "uniform sampler2D tex2; // V \n"
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136 "\n"
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137 "// YUV offset \n"
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138 "const vec3 offset = vec3(-0.0625, -0.5, -0.5);\n"
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139 "\n"
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140 "// RGB coefficients \n"
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141 "const vec3 Rcoeff = vec3(1.164, 0.000, 1.596);\n"
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142 "const vec3 Gcoeff = vec3(1.164, -0.391, -0.813);\n"
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143 "const vec3 Bcoeff = vec3(1.164, 2.018, 0.000);\n"
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144 "\n"
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145 "void main()\n"
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146 "{\n"
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147 " vec2 tcoord;\n"
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148 " vec3 yuv, rgb;\n"
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149 "\n"
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150 " // Get the Y value \n"
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151 " tcoord = v_texCoord;\n"
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152 " yuv.x = texture2D(tex0, tcoord).r;\n"
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153 "\n"
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154 " // Get the U and V values \n"
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155 " tcoord *= 0.5;\n"
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156 " yuv.y = texture2D(tex1, tcoord).r;\n"
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157 " yuv.z = texture2D(tex2, tcoord).r;\n"
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158 "\n"
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159 " // Do the color transform \n"
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160 " yuv += offset;\n"
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161 " rgb.r = dot(yuv, Rcoeff);\n"
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162 " rgb.g = dot(yuv, Gcoeff);\n"
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163 " rgb.b = dot(yuv, Bcoeff);\n"
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164 "\n"
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165 " // That was easy. :) \n"
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166 " gl_FragColor = vec4(rgb, 1.0) * v_color;\n"
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167 "}"
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168 },
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169 };
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170
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171 static SDL_bool
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172 CompileShader(GL_ShaderContext *ctx, GLenum shader, const char *defines, const char *source)
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173 {
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174 GLint status;
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175 const char *sources[2];
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176
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177 sources[0] = defines;
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178 sources[1] = source;
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179
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180 ctx->glShaderSourceARB(shader, SDL_arraysize(sources), sources, NULL);
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181 ctx->glCompileShaderARB(shader);
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182 ctx->glGetObjectParameterivARB(shader, GL_OBJECT_COMPILE_STATUS_ARB, &status);
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183 if (status == 0) {
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184 GLint length;
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185 char *info;
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186
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187 ctx->glGetObjectParameterivARB(shader, GL_OBJECT_INFO_LOG_LENGTH_ARB, &length);
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188 info = SDL_stack_alloc(char, length+1);
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189 ctx->glGetInfoLogARB(shader, length, NULL, info);
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190 SDL_LogError(SDL_LOG_CATEGORY_RENDER,
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e82908c86c9c Made the shaders easier to debug when they don't compile
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191 "Failed to compile shader:\n%s%s\n%s", defines, source, info);
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192 #ifdef DEBUG_SHADERS
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193 fprintf(stderr,
e82908c86c9c Made the shaders easier to debug when they don't compile
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194 "Failed to compile shader:\n%s%s\n%s", defines, source, info);
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195 #endif
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196 SDL_stack_free(info);
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197
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198 return SDL_FALSE;
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199 } else {
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200 return SDL_TRUE;
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201 }
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202 }
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203
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204 static SDL_bool
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205 CompileShaderProgram(GL_ShaderContext *ctx, int index, GL_ShaderData *data)
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206 {
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207 const int num_tmus_bound = 4;
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208 const char *vert_defines = "";
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209 const char *frag_defines = "";
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210 int i;
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211 GLint location;
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212
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213 if (index == SHADER_NONE) {
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214 return SDL_TRUE;
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215 }
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216
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217 ctx->glGetError();
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218
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219 /* Make sure we use the correct sampler type for our texture type */
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220 if (ctx->GL_ARB_texture_rectangle_supported) {
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221 frag_defines =
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222 "#define sampler2D sampler2DRect\n"
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223 "#define texture2D texture2DRect\n";
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224 }
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225
5233
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226 /* Create one program object to rule them all */
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227 data->program = ctx->glCreateProgramObjectARB();
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228
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229 /* Create the vertex shader */
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230 data->vert_shader = ctx->glCreateShaderObjectARB(GL_VERTEX_SHADER_ARB);
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diff changeset
231 if (!CompileShader(ctx, data->vert_shader, vert_defines, shader_source[index][0])) {
5233
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232 return SDL_FALSE;
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233 }
811beeb698f9 Beginning of a framework for OpenGL shaders
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234
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diff changeset
235 /* Create the fragment shader */
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diff changeset
236 data->frag_shader = ctx->glCreateShaderObjectARB(GL_FRAGMENT_SHADER_ARB);
5235
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diff changeset
237 if (!CompileShader(ctx, data->frag_shader, frag_defines, shader_source[index][1])) {
5233
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238 return SDL_FALSE;
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239 }
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240
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241 /* ... and in the darkness bind them */
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242 ctx->glAttachObjectARB(data->program, data->vert_shader);
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243 ctx->glAttachObjectARB(data->program, data->frag_shader);
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244 ctx->glLinkProgramARB(data->program);
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245
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246 /* Set up some uniform variables */
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diff changeset
247 ctx->glUseProgramObjectARB(data->program);
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diff changeset
248 for (i = 0; i < num_tmus_bound; ++i) {
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diff changeset
249 char tex_name[5];
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diff changeset
250 SDL_snprintf(tex_name, SDL_arraysize(tex_name), "tex%d", i);
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diff changeset
251 location = ctx->glGetUniformLocationARB(data->program, tex_name);
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parents:
diff changeset
252 if (location >= 0) {
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c015d3e63631 Fixed setting the texture unit, still doesn't work.
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diff changeset
253 ctx->glUniform1iARB(location, i);
5233
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
254 }
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
255 }
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
256 ctx->glUseProgramObjectARB(0);
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diff changeset
257
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
258 return (ctx->glGetError() == GL_NO_ERROR);
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
259 }
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
260
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
261 static void
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
262 DestroyShaderProgram(GL_ShaderContext *ctx, GL_ShaderData *data)
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
263 {
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
264 ctx->glDeleteObjectARB(data->vert_shader);
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
265 ctx->glDeleteObjectARB(data->frag_shader);
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
266 ctx->glDeleteObjectARB(data->program);
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
267 }
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
268
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
269 GL_ShaderContext *
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
270 GL_CreateShaderContext()
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
271 {
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
272 GL_ShaderContext *ctx;
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
273 SDL_bool shaders_supported;
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
274 int i;
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
275
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diff changeset
276 ctx = (GL_ShaderContext *)SDL_calloc(1, sizeof(*ctx));
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diff changeset
277 if (!ctx) {
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
278 return NULL;
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diff changeset
279 }
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
280
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diff changeset
281 if (SDL_GL_ExtensionSupported("GL_ARB_texture_rectangle")
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diff changeset
282 || SDL_GL_ExtensionSupported("GL_EXT_texture_rectangle")) {
8efa43b915be Fixed the shaders (needed to use texture2DRect) - thanks Ryan!
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diff changeset
283 ctx->GL_ARB_texture_rectangle_supported = SDL_TRUE;
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diff changeset
284 }
8efa43b915be Fixed the shaders (needed to use texture2DRect) - thanks Ryan!
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diff changeset
285
5233
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286 /* Check for shader support */
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287 shaders_supported = SDL_FALSE;
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288 if (SDL_GL_ExtensionSupported("GL_ARB_shader_objects") &&
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289 SDL_GL_ExtensionSupported("GL_ARB_shading_language_100") &&
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290 SDL_GL_ExtensionSupported("GL_ARB_vertex_shader") &&
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291 SDL_GL_ExtensionSupported("GL_ARB_fragment_shader")) {
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292 ctx->glGetError = (GLenum (*)(void)) SDL_GL_GetProcAddress("glGetError");
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293 ctx->glAttachObjectARB = (PFNGLATTACHOBJECTARBPROC) SDL_GL_GetProcAddress("glAttachObjectARB");
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294 ctx->glCompileShaderARB = (PFNGLCOMPILESHADERARBPROC) SDL_GL_GetProcAddress("glCompileShaderARB");
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295 ctx->glCreateProgramObjectARB = (PFNGLCREATEPROGRAMOBJECTARBPROC) SDL_GL_GetProcAddress("glCreateProgramObjectARB");
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296 ctx->glCreateShaderObjectARB = (PFNGLCREATESHADEROBJECTARBPROC) SDL_GL_GetProcAddress("glCreateShaderObjectARB");
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297 ctx->glDeleteObjectARB = (PFNGLDELETEOBJECTARBPROC) SDL_GL_GetProcAddress("glDeleteObjectARB");
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298 ctx->glGetInfoLogARB = (PFNGLGETINFOLOGARBPROC) SDL_GL_GetProcAddress("glGetInfoLogARB");
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299 ctx->glGetObjectParameterivARB = (PFNGLGETOBJECTPARAMETERIVARBPROC) SDL_GL_GetProcAddress("glGetObjectParameterivARB");
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300 ctx->glGetUniformLocationARB = (PFNGLGETUNIFORMLOCATIONARBPROC) SDL_GL_GetProcAddress("glGetUniformLocationARB");
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301 ctx->glLinkProgramARB = (PFNGLLINKPROGRAMARBPROC) SDL_GL_GetProcAddress("glLinkProgramARB");
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302 ctx->glShaderSourceARB = (PFNGLSHADERSOURCEARBPROC) SDL_GL_GetProcAddress("glShaderSourceARB");
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303 ctx->glUniform1iARB = (PFNGLUNIFORM1IARBPROC) SDL_GL_GetProcAddress("glUniform1iARB");
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304 ctx->glUniform1fARB = (PFNGLUNIFORM1FARBPROC) SDL_GL_GetProcAddress("glUniform1fARB");
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305 ctx->glUseProgramObjectARB = (PFNGLUSEPROGRAMOBJECTARBPROC) SDL_GL_GetProcAddress("glUseProgramObjectARB");
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306 if (ctx->glGetError &&
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307 ctx->glAttachObjectARB &&
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308 ctx->glCompileShaderARB &&
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309 ctx->glCreateProgramObjectARB &&
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310 ctx->glCreateShaderObjectARB &&
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311 ctx->glDeleteObjectARB &&
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312 ctx->glGetInfoLogARB &&
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313 ctx->glGetObjectParameterivARB &&
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314 ctx->glGetUniformLocationARB &&
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315 ctx->glLinkProgramARB &&
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316 ctx->glShaderSourceARB &&
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317 ctx->glUniform1iARB &&
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318 ctx->glUniform1fARB &&
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319 ctx->glUseProgramObjectARB) {
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320 shaders_supported = SDL_TRUE;
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321 }
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322 }
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323
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324 if (!shaders_supported) {
5242
55b31686f82b Fixed crash when shaders aren't available.
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325 SDL_free(ctx);
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326 return NULL;
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327 }
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328
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329 /* Compile all the shaders */
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330 for (i = 0; i < NUM_SHADERS; ++i) {
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331 if (!CompileShaderProgram(ctx, i, &ctx->shaders[i])) {
811beeb698f9 Beginning of a framework for OpenGL shaders
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332 GL_DestroyShaderContext(ctx);
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333 return NULL;
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334 }
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335 }
811beeb698f9 Beginning of a framework for OpenGL shaders
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336
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337 /* We're done! */
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338 return ctx;
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339 }
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340
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341 void
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342 GL_SelectShader(GL_ShaderContext *ctx, GL_Shader shader)
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343 {
811beeb698f9 Beginning of a framework for OpenGL shaders
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344 /* Nothing to do if there's no shader support */
811beeb698f9 Beginning of a framework for OpenGL shaders
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345 if (!ctx) {
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346 return;
811beeb698f9 Beginning of a framework for OpenGL shaders
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347 }
811beeb698f9 Beginning of a framework for OpenGL shaders
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348
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349 /* Nothing to do if there's no shader change */
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350 if (shader == ctx->current_shader) {
811beeb698f9 Beginning of a framework for OpenGL shaders
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351 return;
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
352 }
811beeb698f9 Beginning of a framework for OpenGL shaders
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353
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354 ctx->glUseProgramObjectARB(ctx->shaders[shader].program);
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355 ctx->current_shader = shader;
811beeb698f9 Beginning of a framework for OpenGL shaders
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356 }
811beeb698f9 Beginning of a framework for OpenGL shaders
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357
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
358 void
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
359 GL_DestroyShaderContext(GL_ShaderContext *ctx)
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
360 {
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
361 int i;
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
362
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
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diff changeset
363 for (i = 0; i < NUM_SHADERS; ++i) {
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
364 DestroyShaderProgram(ctx, &ctx->shaders[i]);
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
365 }
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
366 SDL_free(ctx);
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
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diff changeset
367 }
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
368
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
369 #endif /* SDL_VIDEO_RENDER_OGL && !SDL_RENDER_DISABLED */
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370
811beeb698f9 Beginning of a framework for OpenGL shaders
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371 /* vi: set ts=4 sw=4 expandtab: */