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annotate src/render/opengl/SDL_shaders_gl.c @ 5275:7aba0406c273

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Frank Zago to sdl The following patch fixes some of the bitrot for the Nintendo DS port. The support is still basic at the moment, but it allows to run the "general" test under the current head of tree (parent: 5269:11bd1585efb5 tip). Most of the patch is mine, but I integrated a couple changes that John Magnotti posted on Feb 1st.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 12 Feb 2011 11:36:56 -0800
parents b530ef003506
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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diff changeset
144 "\n"
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diff changeset
145 "void main()\n"
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diff changeset
146 "{\n"
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diff changeset
147 " vec2 tcoord;\n"
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diff changeset
148 " vec3 yuv, rgb;\n"
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diff changeset
149 "\n"
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diff changeset
150 " // Get the Y value \n"
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diff changeset
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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diff changeset
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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diff changeset
158 "\n"
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diff changeset
159 " // Do the color transform \n"
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diff changeset
160 " yuv += offset;\n"
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diff changeset
161 " rgb.r = dot(yuv, Rcoeff);\n"
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diff changeset
162 " rgb.g = dot(yuv, Gcoeff);\n"
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diff changeset
163 " rgb.b = dot(yuv, Bcoeff);\n"
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diff changeset
164 "\n"
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diff changeset
165 " // That was easy. :) \n"
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166 " gl_FragColor = vec4(rgb, 1.0) * v_color;\n"
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diff changeset
167 "}"
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diff changeset
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)
5233
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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);
5233
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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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diff changeset
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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diff changeset
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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diff changeset
194 "Failed to compile shader:\n%s%s\n%s", defines, source, info);
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diff changeset
195 #endif
5233
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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 {
811beeb698f9 Beginning of a framework for OpenGL shaders
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207 const int num_tmus_bound = 4;
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8efa43b915be Fixed the shaders (needed to use texture2DRect) - thanks Ryan!
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208 const char *vert_defines = "";
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209 const char *frag_defines = "";
5233
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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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diff changeset
221 frag_defines =
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diff changeset
222 "#define sampler2D sampler2DRect\n"
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223 "#define texture2D texture2DRect\n";
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224 }
8efa43b915be Fixed the shaders (needed to use texture2DRect) - thanks Ryan!
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diff changeset
225
5233
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diff changeset
226 /* Create one program object to rule them all */
811beeb698f9 Beginning of a framework for OpenGL shaders
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227 data->program = ctx->glCreateProgramObjectARB();
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228
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
229 /* Create the vertex shader */
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
230 data->vert_shader = ctx->glCreateShaderObjectARB(GL_VERTEX_SHADER_ARB);
5235
8efa43b915be Fixed the shaders (needed to use texture2DRect) - thanks Ryan!
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diff changeset
231 if (!CompileShader(ctx, data->vert_shader, vert_defines, shader_source[index][0])) {
5233
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
232 return SDL_FALSE;
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
233 }
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
234
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
235 /* Create the fragment shader */
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
236 data->frag_shader = ctx->glCreateShaderObjectARB(GL_FRAGMENT_SHADER_ARB);
5235
8efa43b915be Fixed the shaders (needed to use texture2DRect) - thanks Ryan!
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parents: 5234
diff changeset
237 if (!CompileShader(ctx, data->frag_shader, frag_defines, shader_source[index][1])) {
5233
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
238 return SDL_FALSE;
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
239 }
811beeb698f9 Beginning of a framework for OpenGL shaders
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240
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
241 /* ... and in the darkness bind them */
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
242 ctx->glAttachObjectARB(data->program, data->vert_shader);
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diff changeset
243 ctx->glAttachObjectARB(data->program, data->frag_shader);
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diff changeset
244 ctx->glLinkProgramARB(data->program);
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diff changeset
245
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
246 /* Set up some uniform variables */
811beeb698f9 Beginning of a framework for OpenGL shaders
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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) {
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
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);
811beeb698f9 Beginning of a framework for OpenGL shaders
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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) {
5234
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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parents:
diff changeset
255 }
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
256 ctx->glUseProgramObjectARB(0);
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
257
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
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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parents:
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
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
263 {
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
264 ctx->glDeleteObjectARB(data->vert_shader);
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
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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parents:
diff changeset
269 GL_ShaderContext *
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
270 GL_CreateShaderContext()
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
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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parents:
diff changeset
273 SDL_bool shaders_supported;
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
274 int i;
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
275
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
276 ctx = (GL_ShaderContext *)SDL_calloc(1, sizeof(*ctx));
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
277 if (!ctx) {
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
278 return NULL;
811beeb698f9 Beginning of a framework for OpenGL shaders
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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")
8efa43b915be Fixed the shaders (needed to use texture2DRect) - thanks Ryan!
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parents: 5234
diff changeset
282 || SDL_GL_ExtensionSupported("GL_EXT_texture_rectangle")) {
8efa43b915be Fixed the shaders (needed to use texture2DRect) - thanks Ryan!
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parents: 5234
diff changeset
283 ctx->GL_ARB_texture_rectangle_supported = SDL_TRUE;
8efa43b915be Fixed the shaders (needed to use texture2DRect) - thanks Ryan!
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parents: 5234
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284 }
8efa43b915be Fixed the shaders (needed to use texture2DRect) - thanks Ryan!
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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 }
811beeb698f9 Beginning of a framework for OpenGL shaders
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323
811beeb698f9 Beginning of a framework for OpenGL shaders
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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);
5233
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326 return NULL;
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327 }
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328
811beeb698f9 Beginning of a framework for OpenGL shaders
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329 /* Compile all the shaders */
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330 for (i = 0; i < NUM_SHADERS; ++i) {
811beeb698f9 Beginning of a framework for OpenGL shaders
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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
811beeb698f9 Beginning of a framework for OpenGL shaders
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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 */
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345 if (!ctx) {
811beeb698f9 Beginning of a framework for OpenGL shaders
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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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352 }
811beeb698f9 Beginning of a framework for OpenGL shaders
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353
811beeb698f9 Beginning of a framework for OpenGL shaders
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354 ctx->glUseProgramObjectARB(ctx->shaders[shader].program);
811beeb698f9 Beginning of a framework for OpenGL shaders
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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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358 void
811beeb698f9 Beginning of a framework for OpenGL shaders
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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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361 int i;
811beeb698f9 Beginning of a framework for OpenGL shaders
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362
811beeb698f9 Beginning of a framework for OpenGL shaders
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363 for (i = 0; i < NUM_SHADERS; ++i) {
811beeb698f9 Beginning of a framework for OpenGL shaders
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364 DestroyShaderProgram(ctx, &ctx->shaders[i]);
811beeb698f9 Beginning of a framework for OpenGL shaders
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365 }
811beeb698f9 Beginning of a framework for OpenGL shaders
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366 SDL_free(ctx);
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
367 }
811beeb698f9 Beginning of a framework for OpenGL shaders
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368
811beeb698f9 Beginning of a framework for OpenGL shaders
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369 #endif /* SDL_VIDEO_RENDER_OGL && !SDL_RENDER_DISABLED */
811beeb698f9 Beginning of a framework for OpenGL shaders
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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: */