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annotate src/render/opengl/SDL_shaders_gl.c @ 5233:811beeb698f9

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Beginning of a framework for OpenGL shaders
author Sam Lantinga <slouken@libsdl.org>
date Tue, 08 Feb 2011 16:27:52 -0800
parents
children c015d3e63631
rev   line source
5233
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 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 typedef struct
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35 {
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36 GLenum program;
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37 GLenum vert_shader;
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38 GLenum frag_shader;
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39 } GL_ShaderData;
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40
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41 struct GL_ShaderContext
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42 {
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43 GLenum (*glGetError)(void);
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44
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45 PFNGLATTACHOBJECTARBPROC glAttachObjectARB;
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46 PFNGLCOMPILESHADERARBPROC glCompileShaderARB;
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47 PFNGLCREATEPROGRAMOBJECTARBPROC glCreateProgramObjectARB;
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48 PFNGLCREATESHADEROBJECTARBPROC glCreateShaderObjectARB;
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49 PFNGLDELETEOBJECTARBPROC glDeleteObjectARB;
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50 PFNGLGETINFOLOGARBPROC glGetInfoLogARB;
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51 PFNGLGETOBJECTPARAMETERIVARBPROC glGetObjectParameterivARB;
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52 PFNGLGETUNIFORMLOCATIONARBPROC glGetUniformLocationARB;
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53 PFNGLLINKPROGRAMARBPROC glLinkProgramARB;
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54 PFNGLSHADERSOURCEARBPROC glShaderSourceARB;
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55 PFNGLUNIFORM1IARBPROC glUniform1iARB;
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56 PFNGLUNIFORM1FARBPROC glUniform1fARB;
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57 PFNGLUSEPROGRAMOBJECTARBPROC glUseProgramObjectARB;
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58
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59 GL_Shader current_shader;
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60 GL_ShaderData shaders[NUM_SHADERS];
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61 };
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62
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63 static const char *shader_source[NUM_SHADERS][2] =
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64 {
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65 /* SHADER_NONE */
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66 { NULL, NULL },
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67
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68 /* SHADER_SOLID */
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69 {
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70 /* vertex shader */
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71 " \
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72 varying vec4 v_color; \
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73 \
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74 void main() \
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75 { \
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76 gl_Position = ftransform(); \
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77 v_color = gl_Color; \
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78 } \
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79 ",
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80 /* fragment shader */
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81 " \
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82 varying vec4 v_color; \
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83 \
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84 void main() \
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85 { \
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86 gl_FragColor = v_color; \
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87 } \
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88 "
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89 },
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90
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91 /* SHADER_RGB */
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92 {
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93 /* vertex shader */
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94 " \
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95 varying vec4 v_color; \
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96 varying vec2 v_texCoord; \
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97 \
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98 void main() \
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99 { \
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100 gl_Position = ftransform(); \
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101 v_color = gl_Color; \
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102 v_texCoord = vec2(gl_MultiTexCoord0); \
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103 } \
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104 ",
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105 /* fragment shader */
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106 " \
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107 varying vec4 v_color; \
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108 varying vec2 v_texCoord; \
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109 uniform sampler2D tex0; \
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110 \
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111 void main() \
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112 { \
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113 gl_FragColor = texture2D(tex0, v_texCoord) * v_color; \
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114 } \
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115 "
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116 },
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117 };
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118
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119 static SDL_bool
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120 CompileShader(GL_ShaderContext *ctx, GLenum shader, const char *source)
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121 {
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122 GLint status;
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123
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124 ctx->glShaderSourceARB(shader, 1, &source, NULL);
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125 ctx->glCompileShaderARB(shader);
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126 ctx->glGetObjectParameterivARB(shader, GL_OBJECT_COMPILE_STATUS_ARB, &status);
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127 if (status == 0) {
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128 GLint length;
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129 char *info;
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130
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131 ctx->glGetObjectParameterivARB(shader, GL_OBJECT_INFO_LOG_LENGTH_ARB, &length);
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132 info = SDL_stack_alloc(char, length+1);
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133 ctx->glGetInfoLogARB(shader, length, NULL, info);
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134 SDL_LogError(SDL_LOG_CATEGORY_RENDER,
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135 "Failed to compile shader:\n%s\n%s", source, info);
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136 fprintf(stderr, "Failed to compile shader:\n%s\n%s", source, info);
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137 SDL_stack_free(info);
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138
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139 return SDL_FALSE;
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140 } else {
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141 return SDL_TRUE;
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142 }
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143 }
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144
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145 static SDL_bool
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146 CompileShaderProgram(GL_ShaderContext *ctx, int index, GL_ShaderData *data)
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147 {
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148 const int num_tmus_bound = 4;
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149 GLint status;
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150 int i;
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151 GLint location;
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
152
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
153 if (index == SHADER_NONE) {
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
154 return SDL_TRUE;
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
155 }
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
156
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
157 ctx->glGetError();
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
158
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
159 /* Create one program object to rule them all */
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
160 data->program = ctx->glCreateProgramObjectARB();
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
161
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
162 /* Create the vertex shader */
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
163 data->vert_shader = ctx->glCreateShaderObjectARB(GL_VERTEX_SHADER_ARB);
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
164 if (!CompileShader(ctx, data->vert_shader, shader_source[index][0])) {
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
165 return SDL_FALSE;
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
166 }
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
167
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
168 /* Create the fragment shader */
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
169 data->frag_shader = ctx->glCreateShaderObjectARB(GL_FRAGMENT_SHADER_ARB);
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
170 if (!CompileShader(ctx, data->frag_shader, shader_source[index][1])) {
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
171 return SDL_FALSE;
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
172 }
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
173
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
174 /* ... and in the darkness bind them */
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
175 ctx->glAttachObjectARB(data->program, data->vert_shader);
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
176 ctx->glAttachObjectARB(data->program, data->frag_shader);
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
177 ctx->glLinkProgramARB(data->program);
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
178
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
179 /* Set up some uniform variables */
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
180 ctx->glUseProgramObjectARB(data->program);
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
181 for (i = 0; i < num_tmus_bound; ++i) {
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
182 char tex_name[5];
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
183 SDL_snprintf(tex_name, SDL_arraysize(tex_name), "tex%d", i);
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
184 location = ctx->glGetUniformLocationARB(data->program, tex_name);
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
185 if (location >= 0) {
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
186 ctx->glUniform1iARB(location, 1);
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
187 }
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
188 }
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
189 ctx->glUseProgramObjectARB(0);
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
190
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
191 return (ctx->glGetError() == GL_NO_ERROR);
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
192 }
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
193
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
194 static void
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
195 DestroyShaderProgram(GL_ShaderContext *ctx, GL_ShaderData *data)
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
196 {
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
197 if (index == SHADER_NONE) {
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
198 return;
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
199 }
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
200
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
201 ctx->glDeleteObjectARB(data->vert_shader);
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
202 ctx->glDeleteObjectARB(data->frag_shader);
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
203 ctx->glDeleteObjectARB(data->program);
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
204 }
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
205
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
206 GL_ShaderContext *
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
207 GL_CreateShaderContext()
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
208 {
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
209 GL_ShaderContext *ctx;
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
210 SDL_bool shaders_supported;
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
211 int i;
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
212
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
213 ctx = (GL_ShaderContext *)SDL_calloc(1, sizeof(*ctx));
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
214 if (!ctx) {
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
215 return NULL;
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
216 }
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
217
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
218 /* Check for shader support */
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
219 shaders_supported = SDL_FALSE;
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
220 if (SDL_GL_ExtensionSupported("GL_ARB_shader_objects") &&
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
221 SDL_GL_ExtensionSupported("GL_ARB_shading_language_100") &&
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
222 SDL_GL_ExtensionSupported("GL_ARB_vertex_shader") &&
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
223 SDL_GL_ExtensionSupported("GL_ARB_fragment_shader")) {
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
224 ctx->glGetError = (GLenum (*)(void)) SDL_GL_GetProcAddress("glGetError");
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
225 ctx->glAttachObjectARB = (PFNGLATTACHOBJECTARBPROC) SDL_GL_GetProcAddress("glAttachObjectARB");
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
226 ctx->glCompileShaderARB = (PFNGLCOMPILESHADERARBPROC) SDL_GL_GetProcAddress("glCompileShaderARB");
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
227 ctx->glCreateProgramObjectARB = (PFNGLCREATEPROGRAMOBJECTARBPROC) SDL_GL_GetProcAddress("glCreateProgramObjectARB");
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
228 ctx->glCreateShaderObjectARB = (PFNGLCREATESHADEROBJECTARBPROC) SDL_GL_GetProcAddress("glCreateShaderObjectARB");
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
229 ctx->glDeleteObjectARB = (PFNGLDELETEOBJECTARBPROC) SDL_GL_GetProcAddress("glDeleteObjectARB");
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
230 ctx->glGetInfoLogARB = (PFNGLGETINFOLOGARBPROC) SDL_GL_GetProcAddress("glGetInfoLogARB");
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
231 ctx->glGetObjectParameterivARB = (PFNGLGETOBJECTPARAMETERIVARBPROC) SDL_GL_GetProcAddress("glGetObjectParameterivARB");
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
232 ctx->glGetUniformLocationARB = (PFNGLGETUNIFORMLOCATIONARBPROC) SDL_GL_GetProcAddress("glGetUniformLocationARB");
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
233 ctx->glLinkProgramARB = (PFNGLLINKPROGRAMARBPROC) SDL_GL_GetProcAddress("glLinkProgramARB");
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
234 ctx->glShaderSourceARB = (PFNGLSHADERSOURCEARBPROC) SDL_GL_GetProcAddress("glShaderSourceARB");
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
235 ctx->glUniform1iARB = (PFNGLUNIFORM1IARBPROC) SDL_GL_GetProcAddress("glUniform1iARB");
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
236 ctx->glUniform1fARB = (PFNGLUNIFORM1FARBPROC) SDL_GL_GetProcAddress("glUniform1fARB");
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
237 ctx->glUseProgramObjectARB = (PFNGLUSEPROGRAMOBJECTARBPROC) SDL_GL_GetProcAddress("glUseProgramObjectARB");
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
238 if (ctx->glGetError &&
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
239 ctx->glAttachObjectARB &&
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
240 ctx->glCompileShaderARB &&
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
241 ctx->glCreateProgramObjectARB &&
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
242 ctx->glCreateShaderObjectARB &&
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
243 ctx->glDeleteObjectARB &&
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
244 ctx->glGetInfoLogARB &&
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
245 ctx->glGetObjectParameterivARB &&
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
246 ctx->glGetUniformLocationARB &&
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
247 ctx->glLinkProgramARB &&
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
248 ctx->glShaderSourceARB &&
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
249 ctx->glUniform1iARB &&
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
250 ctx->glUniform1fARB &&
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
251 ctx->glUseProgramObjectARB) {
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
252 shaders_supported = SDL_TRUE;
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
253 }
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
254 }
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
255
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
256 if (!shaders_supported) {
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
257 GL_DestroyShaderContext(ctx);
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
258 return NULL;
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
259 }
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
260
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
261 /* Compile all the shaders */
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
262 for (i = 0; i < NUM_SHADERS; ++i) {
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
263 if (!CompileShaderProgram(ctx, i, &ctx->shaders[i])) {
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
264 fprintf(stderr, "Unable to compile shader!\n");
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
265 GL_DestroyShaderContext(ctx);
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
266 return NULL;
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
267 }
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
268 }
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
269
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
270 /* We're done! */
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
271 return ctx;
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
272 }
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
273
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
274 void
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
275 GL_SelectShader(GL_ShaderContext *ctx, GL_Shader shader)
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
276 {
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
277 /* Nothing to do if there's no shader support */
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
278 if (!ctx) {
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
279 return;
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
280 }
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
281
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
282 /* Nothing to do if there's no shader change */
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
283 if (shader == ctx->current_shader) {
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
284 return;
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
285 }
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
286
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
287 ctx->glUseProgramObjectARB(ctx->shaders[shader].program);
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
288 ctx->current_shader = shader;
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
289 }
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
290
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
291 void
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
292 GL_DestroyShaderContext(GL_ShaderContext *ctx)
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
293 {
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
294 int i;
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
295
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
296 for (i = 0; i < NUM_SHADERS; ++i) {
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
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297 DestroyShaderProgram(ctx, &ctx->shaders[i]);
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298 }
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299 SDL_free(ctx);
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300 }
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301
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302 #endif /* SDL_VIDEO_RENDER_OGL && !SDL_RENDER_DISABLED */
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303
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304 /* vi: set ts=4 sw=4 expandtab: */