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author | 2016-02-27 16:28:05 +0100 | |
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committer | 2016-02-27 16:53:49 +0100 | |
commit | cf6dc7d370407914020f3e623719f09c8668c692 (patch) | |
tree | 46b3416d091b4c09b50fba7ffcbd310aed032cc8 /3rdparty/SDL2/src/render/opengl/SDL_shaders_gl.c | |
parent | 64135e73f973d9b95beb0c60b65feb34fbfec64a (diff) |
Placed SDL2 source since we need it on some platforms (nw)
Diffstat (limited to '3rdparty/SDL2/src/render/opengl/SDL_shaders_gl.c')
-rw-r--r-- | 3rdparty/SDL2/src/render/opengl/SDL_shaders_gl.c | 463 |
1 files changed, 463 insertions, 0 deletions
diff --git a/3rdparty/SDL2/src/render/opengl/SDL_shaders_gl.c b/3rdparty/SDL2/src/render/opengl/SDL_shaders_gl.c new file mode 100644 index 00000000000..bcf7b431503 --- /dev/null +++ b/3rdparty/SDL2/src/render/opengl/SDL_shaders_gl.c @@ -0,0 +1,463 @@ +/* + Simple DirectMedia Layer + Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org> + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. +*/ +#include "../../SDL_internal.h" + +#if SDL_VIDEO_RENDER_OGL && !SDL_RENDER_DISABLED + +#include "SDL_stdinc.h" +#include "SDL_log.h" +#include "SDL_opengl.h" +#include "SDL_video.h" +#include "SDL_shaders_gl.h" + +/* OpenGL shader implementation */ + +/* #define DEBUG_SHADERS */ + +typedef struct +{ + GLhandleARB program; + GLhandleARB vert_shader; + GLhandleARB frag_shader; +} GL_ShaderData; + +struct GL_ShaderContext +{ + GLenum (*glGetError)(void); + + PFNGLATTACHOBJECTARBPROC glAttachObjectARB; + PFNGLCOMPILESHADERARBPROC glCompileShaderARB; + PFNGLCREATEPROGRAMOBJECTARBPROC glCreateProgramObjectARB; + PFNGLCREATESHADEROBJECTARBPROC glCreateShaderObjectARB; + PFNGLDELETEOBJECTARBPROC glDeleteObjectARB; + PFNGLGETINFOLOGARBPROC glGetInfoLogARB; + PFNGLGETOBJECTPARAMETERIVARBPROC glGetObjectParameterivARB; + PFNGLGETUNIFORMLOCATIONARBPROC glGetUniformLocationARB; + PFNGLLINKPROGRAMARBPROC glLinkProgramARB; + PFNGLSHADERSOURCEARBPROC glShaderSourceARB; + PFNGLUNIFORM1IARBPROC glUniform1iARB; + PFNGLUNIFORM1FARBPROC glUniform1fARB; + PFNGLUSEPROGRAMOBJECTARBPROC glUseProgramObjectARB; + + SDL_bool GL_ARB_texture_rectangle_supported; + + GL_ShaderData shaders[NUM_SHADERS]; +}; + +/* + * NOTE: Always use sampler2D, etc here. We'll #define them to the + * texture_rectangle versions if we choose to use that extension. + */ +static const char *shader_source[NUM_SHADERS][2] = +{ + /* SHADER_NONE */ + { NULL, NULL }, + + /* SHADER_SOLID */ + { + /* vertex shader */ +"varying vec4 v_color;\n" +"\n" +"void main()\n" +"{\n" +" gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n" +" v_color = gl_Color;\n" +"}", + /* fragment shader */ +"varying vec4 v_color;\n" +"\n" +"void main()\n" +"{\n" +" gl_FragColor = v_color;\n" +"}" + }, + + /* SHADER_RGB */ + { + /* vertex shader */ +"varying vec4 v_color;\n" +"varying vec2 v_texCoord;\n" +"\n" +"void main()\n" +"{\n" +" gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n" +" v_color = gl_Color;\n" +" v_texCoord = vec2(gl_MultiTexCoord0);\n" +"}", + /* fragment shader */ +"varying vec4 v_color;\n" +"varying vec2 v_texCoord;\n" +"uniform sampler2D tex0;\n" +"\n" +"void main()\n" +"{\n" +" gl_FragColor = texture2D(tex0, v_texCoord) * v_color;\n" +"}" + }, + + /* SHADER_YUV */ + { + /* vertex shader */ +"varying vec4 v_color;\n" +"varying vec2 v_texCoord;\n" +"\n" +"void main()\n" +"{\n" +" gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n" +" v_color = gl_Color;\n" +" v_texCoord = vec2(gl_MultiTexCoord0);\n" +"}", + /* fragment shader */ +"varying vec4 v_color;\n" +"varying vec2 v_texCoord;\n" +"uniform sampler2D tex0; // Y \n" +"uniform sampler2D tex1; // U \n" +"uniform sampler2D tex2; // V \n" +"\n" +"// YUV offset \n" +"const vec3 offset = vec3(-0.0627451017, -0.501960814, -0.501960814);\n" +"\n" +"// RGB coefficients \n" +"const vec3 Rcoeff = vec3(1.164, 0.000, 1.596);\n" +"const vec3 Gcoeff = vec3(1.164, -0.391, -0.813);\n" +"const vec3 Bcoeff = vec3(1.164, 2.018, 0.000);\n" +"\n" +"void main()\n" +"{\n" +" vec2 tcoord;\n" +" vec3 yuv, rgb;\n" +"\n" +" // Get the Y value \n" +" tcoord = v_texCoord;\n" +" yuv.x = texture2D(tex0, tcoord).r;\n" +"\n" +" // Get the U and V values \n" +" tcoord *= UVCoordScale;\n" +" yuv.y = texture2D(tex1, tcoord).r;\n" +" yuv.z = texture2D(tex2, tcoord).r;\n" +"\n" +" // Do the color transform \n" +" yuv += offset;\n" +" rgb.r = dot(yuv, Rcoeff);\n" +" rgb.g = dot(yuv, Gcoeff);\n" +" rgb.b = dot(yuv, Bcoeff);\n" +"\n" +" // That was easy. :) \n" +" gl_FragColor = vec4(rgb, 1.0) * v_color;\n" +"}" + }, + + /* SHADER_NV12 */ + { + /* vertex shader */ +"varying vec4 v_color;\n" +"varying vec2 v_texCoord;\n" +"\n" +"void main()\n" +"{\n" +" gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n" +" v_color = gl_Color;\n" +" v_texCoord = vec2(gl_MultiTexCoord0);\n" +"}", + /* fragment shader */ +"varying vec4 v_color;\n" +"varying vec2 v_texCoord;\n" +"uniform sampler2D tex0; // Y \n" +"uniform sampler2D tex1; // U/V \n" +"\n" +"// YUV offset \n" +"const vec3 offset = vec3(-0.0627451017, -0.501960814, -0.501960814);\n" +"\n" +"// RGB coefficients \n" +"const vec3 Rcoeff = vec3(1.164, 0.000, 1.596);\n" +"const vec3 Gcoeff = vec3(1.164, -0.391, -0.813);\n" +"const vec3 Bcoeff = vec3(1.164, 2.018, 0.000);\n" +"\n" +"void main()\n" +"{\n" +" vec2 tcoord;\n" +" vec3 yuv, rgb;\n" +"\n" +" // Get the Y value \n" +" tcoord = v_texCoord;\n" +" yuv.x = texture2D(tex0, tcoord).r;\n" +"\n" +" // Get the U and V values \n" +" tcoord *= UVCoordScale;\n" +" yuv.yz = texture2D(tex1, tcoord).ra;\n" +"\n" +" // Do the color transform \n" +" yuv += offset;\n" +" rgb.r = dot(yuv, Rcoeff);\n" +" rgb.g = dot(yuv, Gcoeff);\n" +" rgb.b = dot(yuv, Bcoeff);\n" +"\n" +" // That was easy. :) \n" +" gl_FragColor = vec4(rgb, 1.0) * v_color;\n" +"}" + }, + + /* SHADER_NV21 */ + { + /* vertex shader */ +"varying vec4 v_color;\n" +"varying vec2 v_texCoord;\n" +"\n" +"void main()\n" +"{\n" +" gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n" +" v_color = gl_Color;\n" +" v_texCoord = vec2(gl_MultiTexCoord0);\n" +"}", + /* fragment shader */ +"varying vec4 v_color;\n" +"varying vec2 v_texCoord;\n" +"uniform sampler2D tex0; // Y \n" +"uniform sampler2D tex1; // U/V \n" +"\n" +"// YUV offset \n" +"const vec3 offset = vec3(-0.0627451017, -0.501960814, -0.501960814);\n" +"\n" +"// RGB coefficients \n" +"const vec3 Rcoeff = vec3(1.164, 0.000, 1.596);\n" +"const vec3 Gcoeff = vec3(1.164, -0.391, -0.813);\n" +"const vec3 Bcoeff = vec3(1.164, 2.018, 0.000);\n" +"\n" +"void main()\n" +"{\n" +" vec2 tcoord;\n" +" vec3 yuv, rgb;\n" +"\n" +" // Get the Y value \n" +" tcoord = v_texCoord;\n" +" yuv.x = texture2D(tex0, tcoord).r;\n" +"\n" +" // Get the U and V values \n" +" tcoord *= UVCoordScale;\n" +" yuv.yz = texture2D(tex1, tcoord).ar;\n" +"\n" +" // Do the color transform \n" +" yuv += offset;\n" +" rgb.r = dot(yuv, Rcoeff);\n" +" rgb.g = dot(yuv, Gcoeff);\n" +" rgb.b = dot(yuv, Bcoeff);\n" +"\n" +" // That was easy. :) \n" +" gl_FragColor = vec4(rgb, 1.0) * v_color;\n" +"}" + }, +}; + +static SDL_bool +CompileShader(GL_ShaderContext *ctx, GLhandleARB shader, const char *defines, const char *source) +{ + GLint status; + const char *sources[2]; + + sources[0] = defines; + sources[1] = source; + + ctx->glShaderSourceARB(shader, SDL_arraysize(sources), sources, NULL); + ctx->glCompileShaderARB(shader); + ctx->glGetObjectParameterivARB(shader, GL_OBJECT_COMPILE_STATUS_ARB, &status); + if (status == 0) { + GLint length; + char *info; + + ctx->glGetObjectParameterivARB(shader, GL_OBJECT_INFO_LOG_LENGTH_ARB, &length); + info = SDL_stack_alloc(char, length+1); + ctx->glGetInfoLogARB(shader, length, NULL, info); + SDL_LogError(SDL_LOG_CATEGORY_RENDER, + "Failed to compile shader:\n%s%s\n%s", defines, source, info); +#ifdef DEBUG_SHADERS + fprintf(stderr, + "Failed to compile shader:\n%s%s\n%s", defines, source, info); +#endif + SDL_stack_free(info); + + return SDL_FALSE; + } else { + return SDL_TRUE; + } +} + +static SDL_bool +CompileShaderProgram(GL_ShaderContext *ctx, int index, GL_ShaderData *data) +{ + const int num_tmus_bound = 4; + const char *vert_defines = ""; + const char *frag_defines = ""; + int i; + GLint location; + + if (index == SHADER_NONE) { + return SDL_TRUE; + } + + ctx->glGetError(); + + /* Make sure we use the correct sampler type for our texture type */ + if (ctx->GL_ARB_texture_rectangle_supported) { + frag_defines = +"#define sampler2D sampler2DRect\n" +"#define texture2D texture2DRect\n" +"#define UVCoordScale 0.5\n"; + } else { + frag_defines = +"#define UVCoordScale 1.0\n"; + } + + /* Create one program object to rule them all */ + data->program = ctx->glCreateProgramObjectARB(); + + /* Create the vertex shader */ + data->vert_shader = ctx->glCreateShaderObjectARB(GL_VERTEX_SHADER_ARB); + if (!CompileShader(ctx, data->vert_shader, vert_defines, shader_source[index][0])) { + return SDL_FALSE; + } + + /* Create the fragment shader */ + data->frag_shader = ctx->glCreateShaderObjectARB(GL_FRAGMENT_SHADER_ARB); + if (!CompileShader(ctx, data->frag_shader, frag_defines, shader_source[index][1])) { + return SDL_FALSE; + } + + /* ... and in the darkness bind them */ + ctx->glAttachObjectARB(data->program, data->vert_shader); + ctx->glAttachObjectARB(data->program, data->frag_shader); + ctx->glLinkProgramARB(data->program); + + /* Set up some uniform variables */ + ctx->glUseProgramObjectARB(data->program); + for (i = 0; i < num_tmus_bound; ++i) { + char tex_name[10]; + SDL_snprintf(tex_name, SDL_arraysize(tex_name), "tex%d", i); + location = ctx->glGetUniformLocationARB(data->program, tex_name); + if (location >= 0) { + ctx->glUniform1iARB(location, i); + } + } + ctx->glUseProgramObjectARB(0); + + return (ctx->glGetError() == GL_NO_ERROR); +} + +static void +DestroyShaderProgram(GL_ShaderContext *ctx, GL_ShaderData *data) +{ + ctx->glDeleteObjectARB(data->vert_shader); + ctx->glDeleteObjectARB(data->frag_shader); + ctx->glDeleteObjectARB(data->program); +} + +GL_ShaderContext * +GL_CreateShaderContext() +{ + GL_ShaderContext *ctx; + SDL_bool shaders_supported; + int i; + + ctx = (GL_ShaderContext *)SDL_calloc(1, sizeof(*ctx)); + if (!ctx) { + return NULL; + } + + if (!SDL_GL_ExtensionSupported("GL_ARB_texture_non_power_of_two") && + (SDL_GL_ExtensionSupported("GL_ARB_texture_rectangle") || + SDL_GL_ExtensionSupported("GL_EXT_texture_rectangle"))) { + ctx->GL_ARB_texture_rectangle_supported = SDL_TRUE; + } + + /* Check for shader support */ + shaders_supported = SDL_FALSE; + if (SDL_GL_ExtensionSupported("GL_ARB_shader_objects") && + SDL_GL_ExtensionSupported("GL_ARB_shading_language_100") && + SDL_GL_ExtensionSupported("GL_ARB_vertex_shader") && + SDL_GL_ExtensionSupported("GL_ARB_fragment_shader")) { + ctx->glGetError = (GLenum (*)(void)) SDL_GL_GetProcAddress("glGetError"); + ctx->glAttachObjectARB = (PFNGLATTACHOBJECTARBPROC) SDL_GL_GetProcAddress("glAttachObjectARB"); + ctx->glCompileShaderARB = (PFNGLCOMPILESHADERARBPROC) SDL_GL_GetProcAddress("glCompileShaderARB"); + ctx->glCreateProgramObjectARB = (PFNGLCREATEPROGRAMOBJECTARBPROC) SDL_GL_GetProcAddress("glCreateProgramObjectARB"); + ctx->glCreateShaderObjectARB = (PFNGLCREATESHADEROBJECTARBPROC) SDL_GL_GetProcAddress("glCreateShaderObjectARB"); + ctx->glDeleteObjectARB = (PFNGLDELETEOBJECTARBPROC) SDL_GL_GetProcAddress("glDeleteObjectARB"); + ctx->glGetInfoLogARB = (PFNGLGETINFOLOGARBPROC) SDL_GL_GetProcAddress("glGetInfoLogARB"); + ctx->glGetObjectParameterivARB = (PFNGLGETOBJECTPARAMETERIVARBPROC) SDL_GL_GetProcAddress("glGetObjectParameterivARB"); + ctx->glGetUniformLocationARB = (PFNGLGETUNIFORMLOCATIONARBPROC) SDL_GL_GetProcAddress("glGetUniformLocationARB"); + ctx->glLinkProgramARB = (PFNGLLINKPROGRAMARBPROC) SDL_GL_GetProcAddress("glLinkProgramARB"); + ctx->glShaderSourceARB = (PFNGLSHADERSOURCEARBPROC) SDL_GL_GetProcAddress("glShaderSourceARB"); + ctx->glUniform1iARB = (PFNGLUNIFORM1IARBPROC) SDL_GL_GetProcAddress("glUniform1iARB"); + ctx->glUniform1fARB = (PFNGLUNIFORM1FARBPROC) SDL_GL_GetProcAddress("glUniform1fARB"); + ctx->glUseProgramObjectARB = (PFNGLUSEPROGRAMOBJECTARBPROC) SDL_GL_GetProcAddress("glUseProgramObjectARB"); + if (ctx->glGetError && + ctx->glAttachObjectARB && + ctx->glCompileShaderARB && + ctx->glCreateProgramObjectARB && + ctx->glCreateShaderObjectARB && + ctx->glDeleteObjectARB && + ctx->glGetInfoLogARB && + ctx->glGetObjectParameterivARB && + ctx->glGetUniformLocationARB && + ctx->glLinkProgramARB && + ctx->glShaderSourceARB && + ctx->glUniform1iARB && + ctx->glUniform1fARB && + ctx->glUseProgramObjectARB) { + shaders_supported = SDL_TRUE; + } + } + + if (!shaders_supported) { + SDL_free(ctx); + return NULL; + } + + /* Compile all the shaders */ + for (i = 0; i < NUM_SHADERS; ++i) { + if (!CompileShaderProgram(ctx, i, &ctx->shaders[i])) { + GL_DestroyShaderContext(ctx); + return NULL; + } + } + + /* We're done! */ + return ctx; +} + +void +GL_SelectShader(GL_ShaderContext *ctx, GL_Shader shader) +{ + ctx->glUseProgramObjectARB(ctx->shaders[shader].program); +} + +void +GL_DestroyShaderContext(GL_ShaderContext *ctx) +{ + int i; + + for (i = 0; i < NUM_SHADERS; ++i) { + DestroyShaderProgram(ctx, &ctx->shaders[i]); + } + SDL_free(ctx); +} + +#endif /* SDL_VIDEO_RENDER_OGL && !SDL_RENDER_DISABLED */ + +/* vi: set ts=4 sw=4 expandtab: */ |