Implementation of render targets, by Mason Wheeler and Gabriel Jacobo
Thanks guys!
This commit is contained in:
Sam Lantinga
parent
2e70e7f3cb
commit
a49a88676f
11 changed files with 879 additions and 45 deletions
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@ -66,6 +66,7 @@ static int GL_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
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const SDL_Rect * srcrect, const SDL_Rect * dstrect);
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static int GL_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
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Uint32 pixel_format, void * pixels, int pitch);
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static int GL_SetTargetTexture(SDL_Renderer * renderer, SDL_Texture * texture);
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static void GL_RenderPresent(SDL_Renderer * renderer);
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static void GL_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture);
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static void GL_DestroyRenderer(SDL_Renderer * renderer);
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@ -82,6 +83,15 @@ SDL_RenderDriver GL_RenderDriver = {
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0}
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};
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typedef struct GL_FBOList GL_FBOList;
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struct GL_FBOList
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{
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Uint32 w, h;
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GLuint FBO;
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GL_FBOList *next;
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};
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typedef struct
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{
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SDL_GLContext context;
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@ -91,6 +101,11 @@ typedef struct
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Uint32 color;
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int blendMode;
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} current;
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SDL_bool GL_EXT_framebuffer_object_supported;
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GL_FBOList *framebuffers;
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SDL_Texture *renderTarget;
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SDL_Rect viewport_copy;
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/* OpenGL functions */
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#define SDL_PROC(ret,func,params) ret (APIENTRY *func) params;
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@ -101,6 +116,12 @@ typedef struct
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SDL_bool GL_ARB_multitexture_supported;
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PFNGLACTIVETEXTUREARBPROC glActiveTextureARB;
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GLint num_texture_units;
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PFNGLGENFRAMEBUFFERSEXTPROC glGenFramebuffersEXT;
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PFNGLDELETEFRAMEBUFFERSEXTPROC glDeleteFramebuffersEXT;
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PFNGLFRAMEBUFFERTEXTURE2DEXTPROC glFramebufferTexture2DEXT;
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PFNGLBINDFRAMEBUFFEREXTPROC glBindFramebufferEXT;
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PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC glCheckFramebufferStatusEXT;
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/* Shader support */
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GL_ShaderContext *shaders;
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@ -123,6 +144,8 @@ typedef struct
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SDL_bool yuv;
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GLuint utexture;
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GLuint vtexture;
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GL_FBOList *fbo;
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} GL_TextureData;
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@ -227,6 +250,29 @@ GL_ResetState(SDL_Renderer *renderer)
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data->glLoadIdentity();
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}
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GL_FBOList *
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GL_GetFBO(GL_RenderData *data, Uint32 w, Uint32 h)
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{
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GL_FBOList *result = data->framebuffers;
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while (result && ((result->w != w) || (result->h != h))) {
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result = result->next;
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}
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if (!result) {
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result = SDL_malloc(sizeof(GL_FBOList));
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if (result) {
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result->w = w;
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result->h = h;
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data->glGenFramebuffersEXT(1, &result->FBO);
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result->next = data->framebuffers;
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data->framebuffers = result;
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}
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}
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return result;
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}
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SDL_Renderer *
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GL_CreateRenderer(SDL_Window * window, Uint32 flags)
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{
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@ -269,6 +315,7 @@ GL_CreateRenderer(SDL_Window * window, Uint32 flags)
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renderer->RenderDrawLines = GL_RenderDrawLines;
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renderer->RenderFillRects = GL_RenderFillRects;
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renderer->RenderCopy = GL_RenderCopy;
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renderer->SetTargetTexture = GL_SetTargetTexture;
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renderer->RenderReadPixels = GL_RenderReadPixels;
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renderer->RenderPresent = GL_RenderPresent;
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renderer->DestroyTexture = GL_DestroyTexture;
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@ -341,6 +388,22 @@ GL_CreateRenderer(SDL_Window * window, Uint32 flags)
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renderer->info.texture_formats[renderer->info.num_texture_formats++] = SDL_PIXELFORMAT_YV12;
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renderer->info.texture_formats[renderer->info.num_texture_formats++] = SDL_PIXELFORMAT_IYUV;
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}
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if (SDL_GL_ExtensionSupported("GL_EXT_framebuffer_object")) {
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data->GL_EXT_framebuffer_object_supported = SDL_TRUE;
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data->glGenFramebuffersEXT = (PFNGLGENFRAMEBUFFERSEXTPROC)
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SDL_GL_GetProcAddress("glGenFramebuffersEXT");
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data->glDeleteFramebuffersEXT = (PFNGLDELETEFRAMEBUFFERSEXTPROC)
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SDL_GL_GetProcAddress("glDeleteFramebuffersEXT");
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data->glFramebufferTexture2DEXT = (PFNGLFRAMEBUFFERTEXTURE2DEXTPROC)
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SDL_GL_GetProcAddress("glFramebufferTexture2DEXT");
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data->glBindFramebufferEXT = (PFNGLBINDFRAMEBUFFEREXTPROC)
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SDL_GL_GetProcAddress("glBindFramebufferEXT");
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data->glCheckFramebufferStatusEXT = (PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC)
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SDL_GL_GetProcAddress("glCheckFramebufferStatusEXT");
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}
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data->framebuffers = NULL;
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data->renderTarget = NULL;
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/* Set up parameters for rendering */
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GL_ResetState(renderer);
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@ -402,6 +465,74 @@ GetScaleQuality(void)
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}
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}
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static int
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GL_SetTargetTexture(SDL_Renderer * renderer, SDL_Texture * texture)
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{
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GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
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GL_TextureData *texturedata;
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GLenum status;
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if (!renderer) return -1;
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GL_ActivateRenderer(renderer);
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if (! data->GL_EXT_framebuffer_object_supported) {
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SDL_Unsupported();
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return -1;
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}
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if (texture == NULL) {
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if (data->renderTarget != NULL) {
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data->renderTarget = NULL;
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renderer->viewport = data->viewport_copy;
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data->glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
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data->glMatrixMode(GL_PROJECTION);
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data->glLoadIdentity();
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data->glMatrixMode(GL_MODELVIEW);
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data->glLoadIdentity();
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data->glViewport(renderer->viewport.x, renderer->viewport.y, renderer->viewport.w, renderer->viewport.h);
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data->glOrtho(0.0, (GLdouble) renderer->viewport.w, (GLdouble) renderer->viewport.h, 0.0, 0.0, 1.0);
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}
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return 0;
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}
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if (renderer != texture->renderer) return -1;
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if (data->renderTarget==NULL) {
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// Keep a copy of the default viewport to restore when texture==NULL
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data->viewport_copy = renderer->viewport;
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}
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texturedata = (GL_TextureData *) texture->driverdata;
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if (!texturedata) {
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if (texture->native && texture->native->driverdata) {
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texture = texture->native;
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texturedata = texture->driverdata;
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}
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else return -1;
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}
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data->glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, texturedata->fbo->FBO);
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/* TODO: check if texture pixel format allows this operation */
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data->glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, texturedata->type, texturedata->texture, 0);
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/* Check FBO status */
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status = data->glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
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if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
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return -1;
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}
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data->renderTarget = texture;
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renderer->viewport.x = 0;
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renderer->viewport.y = 0;
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renderer->viewport.w = texture->w;
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renderer->viewport.h = texture->h;
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data->glMatrixMode(GL_PROJECTION);
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data->glLoadIdentity();
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data->glOrtho(0.0, (GLdouble) texture->w, 0.0, (GLdouble) texture->h, 0.0, 1.0);
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data->glMatrixMode(GL_MODELVIEW);
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data->glLoadIdentity();
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data->glViewport(0, 0, texture->w, texture->h);
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return 0;
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}
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static int
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GL_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
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{
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@ -446,10 +577,17 @@ GL_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
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}
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texture->driverdata = data;
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if (texture->access == SDL_TEXTUREACCESS_TARGET) {
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data->fbo = GL_GetFBO(renderdata, texture->w, texture->h);
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} else {
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data->fbo = NULL;
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}
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renderdata->glGetError();
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renderdata->glGenTextures(1, &data->texture);
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if (renderdata->GL_ARB_texture_rectangle_supported) {
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if ((renderdata->GL_ARB_texture_rectangle_supported)
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/*&& texture->access != SDL_TEXTUREACCESS_TARGET*/){
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data->type = GL_TEXTURE_RECTANGLE_ARB;
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texture_w = texture->w;
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texture_h = texture->h;
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@ -1013,6 +1151,13 @@ GL_DestroyRenderer(SDL_Renderer * renderer)
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GL_DestroyShaderContext(data->shaders);
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}
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if (data->context) {
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while (data->framebuffers) {
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GL_FBOList *nextnode = data->framebuffers->next;
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/* delete the framebuffer object */
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data->glDeleteFramebuffersEXT(1, &data->framebuffers->FBO);
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SDL_free(data->framebuffers);
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data->framebuffers = nextnode;
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}
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/* SDL_GL_MakeCurrent(0, NULL); *//* doesn't do anything */
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SDL_GL_DeleteContext(data->context);
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}
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