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annotate src/render/opengl/SDL_shaders_gl.c @ 5236:e82908c86c9c

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Made the shaders easier to debug when they don't compile
author Sam Lantinga <slouken@libsdl.org>
date Tue, 08 Feb 2011 20:31:39 -0800
parents 8efa43b915be
children 55b31686f82b
rev   line source
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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 /*#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
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119 static SDL_bool
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120 CompileShader(GL_ShaderContext *ctx, GLenum shader, const char *defines, const char *source)
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121 {
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122 GLint status;
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123 const char *sources[2];
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124
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125 sources[0] = defines;
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126 sources[1] = source;
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127
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128 ctx->glShaderSourceARB(shader, SDL_arraysize(sources), sources, NULL);
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129 ctx->glCompileShaderARB(shader);
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130 ctx->glGetObjectParameterivARB(shader, GL_OBJECT_COMPILE_STATUS_ARB, &status);
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131 if (status == 0) {
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132 GLint length;
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133 char *info;
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134
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135 ctx->glGetObjectParameterivARB(shader, GL_OBJECT_INFO_LOG_LENGTH_ARB, &length);
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136 info = SDL_stack_alloc(char, length+1);
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137 ctx->glGetInfoLogARB(shader, length, NULL, info);
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138 SDL_LogError(SDL_LOG_CATEGORY_RENDER,
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139 "Failed to compile shader:\n%s%s\n%s", defines, source, info);
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140 #ifdef DEBUG_SHADERS
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diff changeset
141 fprintf(stderr,
e82908c86c9c Made the shaders easier to debug when they don't compile
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diff changeset
142 "Failed to compile shader:\n%s%s\n%s", defines, source, info);
e82908c86c9c Made the shaders easier to debug when they don't compile
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diff changeset
143 #endif
5233
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144 SDL_stack_free(info);
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145
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diff changeset
146 return SDL_FALSE;
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parents:
diff changeset
147 } else {
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diff changeset
148 return SDL_TRUE;
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parents:
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149 }
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diff changeset
150 }
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151
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diff changeset
152 static SDL_bool
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diff changeset
153 CompileShaderProgram(GL_ShaderContext *ctx, int index, GL_ShaderData *data)
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diff changeset
154 {
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
155 const int num_tmus_bound = 4;
5235
8efa43b915be Fixed the shaders (needed to use texture2DRect) - thanks Ryan!
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diff changeset
156 const char *vert_defines = "";
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diff changeset
157 const char *frag_defines = "";
5233
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158 int i;
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diff changeset
159 GLint location;
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160
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
161 if (index == SHADER_NONE) {
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
162 return SDL_TRUE;
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
163 }
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
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164
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165 ctx->glGetError();
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166
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diff changeset
167 /* Make sure we use the correct sampler type for our texture type */
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parents: 5234
diff changeset
168 if (ctx->GL_ARB_texture_rectangle_supported) {
8efa43b915be Fixed the shaders (needed to use texture2DRect) - thanks Ryan!
Sam Lantinga <slouken@libsdl.org>
parents: 5234
diff changeset
169 frag_defines =
8efa43b915be Fixed the shaders (needed to use texture2DRect) - thanks Ryan!
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diff changeset
170 "#define sampler2D sampler2DRect\n"
8efa43b915be Fixed the shaders (needed to use texture2DRect) - thanks Ryan!
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diff changeset
171 "#define texture2D texture2DRect\n";
8efa43b915be Fixed the shaders (needed to use texture2DRect) - thanks Ryan!
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172 }
8efa43b915be Fixed the shaders (needed to use texture2DRect) - thanks Ryan!
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173
5233
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174 /* Create one program object to rule them all */
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175 data->program = ctx->glCreateProgramObjectARB();
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176
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177 /* Create the vertex shader */
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178 data->vert_shader = ctx->glCreateShaderObjectARB(GL_VERTEX_SHADER_ARB);
5235
8efa43b915be Fixed the shaders (needed to use texture2DRect) - thanks Ryan!
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179 if (!CompileShader(ctx, data->vert_shader, vert_defines, shader_source[index][0])) {
5233
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180 return SDL_FALSE;
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
181 }
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
182
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
183 /* Create the fragment shader */
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diff changeset
184 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
185 if (!CompileShader(ctx, data->frag_shader, frag_defines, shader_source[index][1])) {
5233
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186 return SDL_FALSE;
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
187 }
811beeb698f9 Beginning of a framework for OpenGL shaders
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188
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
189 /* ... and in the darkness bind them */
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diff changeset
190 ctx->glAttachObjectARB(data->program, data->vert_shader);
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
191 ctx->glAttachObjectARB(data->program, data->frag_shader);
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
192 ctx->glLinkProgramARB(data->program);
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diff changeset
193
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
194 /* Set up some uniform variables */
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
195 ctx->glUseProgramObjectARB(data->program);
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
196 for (i = 0; i < num_tmus_bound; ++i) {
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
197 char tex_name[5];
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
198 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
199 location = ctx->glGetUniformLocationARB(data->program, tex_name);
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
200 if (location >= 0) {
5234
c015d3e63631 Fixed setting the texture unit, still doesn't work.
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parents: 5233
diff changeset
201 ctx->glUniform1iARB(location, i);
5233
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
202 }
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
203 }
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
204 ctx->glUseProgramObjectARB(0);
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
205
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
206 return (ctx->glGetError() == GL_NO_ERROR);
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
207 }
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
208
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
209 static void
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
210 DestroyShaderProgram(GL_ShaderContext *ctx, GL_ShaderData *data)
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
211 {
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
212 if (index == SHADER_NONE) {
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
213 return;
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
214 }
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
215
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
216 ctx->glDeleteObjectARB(data->vert_shader);
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
217 ctx->glDeleteObjectARB(data->frag_shader);
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
218 ctx->glDeleteObjectARB(data->program);
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
219 }
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
220
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
221 GL_ShaderContext *
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
222 GL_CreateShaderContext()
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
223 {
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
224 GL_ShaderContext *ctx;
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
225 SDL_bool shaders_supported;
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
226 int i;
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
227
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
228 ctx = (GL_ShaderContext *)SDL_calloc(1, sizeof(*ctx));
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
229 if (!ctx) {
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
230 return NULL;
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
231 }
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
232
5235
8efa43b915be Fixed the shaders (needed to use texture2DRect) - thanks Ryan!
Sam Lantinga <slouken@libsdl.org>
parents: 5234
diff changeset
233 if (SDL_GL_ExtensionSupported("GL_ARB_texture_rectangle")
8efa43b915be Fixed the shaders (needed to use texture2DRect) - thanks Ryan!
Sam Lantinga <slouken@libsdl.org>
parents: 5234
diff changeset
234 || SDL_GL_ExtensionSupported("GL_EXT_texture_rectangle")) {
8efa43b915be Fixed the shaders (needed to use texture2DRect) - thanks Ryan!
Sam Lantinga <slouken@libsdl.org>
parents: 5234
diff changeset
235 ctx->GL_ARB_texture_rectangle_supported = SDL_TRUE;
8efa43b915be Fixed the shaders (needed to use texture2DRect) - thanks Ryan!
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parents: 5234
diff changeset
236 }
8efa43b915be Fixed the shaders (needed to use texture2DRect) - thanks Ryan!
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parents: 5234
diff changeset
237
5233
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
238 /* Check for shader support */
811beeb698f9 Beginning of a framework for OpenGL shaders
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diff changeset
239 shaders_supported = SDL_FALSE;
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
240 if (SDL_GL_ExtensionSupported("GL_ARB_shader_objects") &&
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
241 SDL_GL_ExtensionSupported("GL_ARB_shading_language_100") &&
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
242 SDL_GL_ExtensionSupported("GL_ARB_vertex_shader") &&
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
243 SDL_GL_ExtensionSupported("GL_ARB_fragment_shader")) {
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
244 ctx->glGetError = (GLenum (*)(void)) SDL_GL_GetProcAddress("glGetError");
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
245 ctx->glAttachObjectARB = (PFNGLATTACHOBJECTARBPROC) SDL_GL_GetProcAddress("glAttachObjectARB");
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
246 ctx->glCompileShaderARB = (PFNGLCOMPILESHADERARBPROC) SDL_GL_GetProcAddress("glCompileShaderARB");
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
247 ctx->glCreateProgramObjectARB = (PFNGLCREATEPROGRAMOBJECTARBPROC) SDL_GL_GetProcAddress("glCreateProgramObjectARB");
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
248 ctx->glCreateShaderObjectARB = (PFNGLCREATESHADEROBJECTARBPROC) SDL_GL_GetProcAddress("glCreateShaderObjectARB");
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
249 ctx->glDeleteObjectARB = (PFNGLDELETEOBJECTARBPROC) SDL_GL_GetProcAddress("glDeleteObjectARB");
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
250 ctx->glGetInfoLogARB = (PFNGLGETINFOLOGARBPROC) SDL_GL_GetProcAddress("glGetInfoLogARB");
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
251 ctx->glGetObjectParameterivARB = (PFNGLGETOBJECTPARAMETERIVARBPROC) SDL_GL_GetProcAddress("glGetObjectParameterivARB");
811beeb698f9 Beginning of a framework for OpenGL shaders
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parents:
diff changeset
252 ctx->glGetUniformLocationARB = (PFNGLGETUNIFORMLOCATIONARBPROC) SDL_GL_GetProcAddress("glGetUniformLocationARB");
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
253 ctx->glLinkProgramARB = (PFNGLLINKPROGRAMARBPROC) SDL_GL_GetProcAddress("glLinkProgramARB");
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
254 ctx->glShaderSourceARB = (PFNGLSHADERSOURCEARBPROC) SDL_GL_GetProcAddress("glShaderSourceARB");
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
255 ctx->glUniform1iARB = (PFNGLUNIFORM1IARBPROC) SDL_GL_GetProcAddress("glUniform1iARB");
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
256 ctx->glUniform1fARB = (PFNGLUNIFORM1FARBPROC) SDL_GL_GetProcAddress("glUniform1fARB");
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
257 ctx->glUseProgramObjectARB = (PFNGLUSEPROGRAMOBJECTARBPROC) SDL_GL_GetProcAddress("glUseProgramObjectARB");
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
258 if (ctx->glGetError &&
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
259 ctx->glAttachObjectARB &&
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
260 ctx->glCompileShaderARB &&
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
261 ctx->glCreateProgramObjectARB &&
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
262 ctx->glCreateShaderObjectARB &&
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
263 ctx->glDeleteObjectARB &&
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
264 ctx->glGetInfoLogARB &&
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
265 ctx->glGetObjectParameterivARB &&
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
266 ctx->glGetUniformLocationARB &&
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
267 ctx->glLinkProgramARB &&
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
268 ctx->glShaderSourceARB &&
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
269 ctx->glUniform1iARB &&
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
270 ctx->glUniform1fARB &&
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
271 ctx->glUseProgramObjectARB) {
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
272 shaders_supported = SDL_TRUE;
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 }
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
275
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
276 if (!shaders_supported) {
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
277 GL_DestroyShaderContext(ctx);
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
278 return NULL;
811beeb698f9 Beginning of a framework for OpenGL shaders
Sam Lantinga <slouken@libsdl.org>
parents:
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279 }
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280
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281 /* Compile all the shaders */
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282 for (i = 0; i < NUM_SHADERS; ++i) {
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283 if (!CompileShaderProgram(ctx, i, &ctx->shaders[i])) {
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284 fprintf(stderr, "Unable to compile shader!\n");
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285 GL_DestroyShaderContext(ctx);
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286 return NULL;
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287 }
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288 }
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289
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290 /* We're done! */
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291 return ctx;
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292 }
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293
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294 void
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295 GL_SelectShader(GL_ShaderContext *ctx, GL_Shader shader)
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296 {
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297 /* Nothing to do if there's no shader support */
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298 if (!ctx) {
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299 return;
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300 }
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301
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302 /* Nothing to do if there's no shader change */
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303 if (shader == ctx->current_shader) {
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304 return;
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305 }
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306
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307 ctx->glUseProgramObjectARB(ctx->shaders[shader].program);
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308 ctx->current_shader = shader;
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309 }
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310
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311 void
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312 GL_DestroyShaderContext(GL_ShaderContext *ctx)
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313 {
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314 int i;
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315
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316 for (i = 0; i < NUM_SHADERS; ++i) {
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317 DestroyShaderProgram(ctx, &ctx->shaders[i]);
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318 }
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319 SDL_free(ctx);
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320 }
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321
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322 #endif /* SDL_VIDEO_RENDER_OGL && !SDL_RENDER_DISABLED */
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323
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324 /* vi: set ts=4 sw=4 expandtab: */