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Implementation of render targets, by Mason Wheeler and Gabriel Jacobo

Browse source 
Thanks guys!
This commit is contained in:
Sam Lantinga 2012-01-18 22:45:49 -05:00
parent 2e70e7f3cb
commit a49a88676f
11 changed files with 879 additions and 45 deletions
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150
src/render/opengles/SDL_render_gles.c
View file

@ -73,6 +73,16 @@ static void GLES_RenderPresent(SDL_Renderer * renderer);
static void GLES_DestroyTexture(SDL_Renderer * renderer,
SDL_Texture * texture);
static void GLES_DestroyRenderer(SDL_Renderer * renderer);
static int GLES_SetTargetTexture(SDL_Renderer * renderer, SDL_Texture * texture);
typedef struct GLES_FBOList GLES_FBOList;
struct GLES_FBOList
{
Uint32 w, h;
GLuint FBO;
GLES_FBOList *next;
};
SDL_RenderDriver GLES_RenderDriver = {
@ -98,6 +108,10 @@ typedef struct
#define SDL_PROC(ret,func,params) ret (APIENTRY *func) params;
#include "SDL_glesfuncs.h"
#undef SDL_PROC
SDL_bool GL_OES_framebuffer_object_supported;
GLES_FBOList *framebuffers;
SDL_Texture *renderTarget;
SDL_Rect viewport_copy;
SDL_bool useDrawTexture;
SDL_bool GL_OES_draw_texture_supported;
@ -113,6 +127,7 @@ typedef struct
GLenum formattype;
void *pixels;
int pitch;
GLES_FBOList *fbo;
} GLES_TextureData;
static void
@ -179,6 +194,27 @@ static int GLES_LoadFunctions(GLES_RenderData * data)
static SDL_GLContext SDL_CurrentContext = NULL;
GLES_FBOList *
GLES_GetFBO(GLES_RenderData *data, Uint32 w, Uint32 h)
{
GLES_FBOList *result = data->framebuffers;
while ((result) && ((result->w != w) || (result->h != h)) )
{
result = result->next;
}
if (result == NULL)
{
result = SDL_malloc(sizeof(GLES_FBOList));
result->w = w;
result->h = h;
glGenFramebuffersOES(1, &result->FBO);
result->next = data->framebuffers;
data->framebuffers = result;
}
return result;
}
static int
GLES_ActivateRenderer(SDL_Renderer * renderer)
{
@ -221,6 +257,71 @@ GLES_ResetState(SDL_Renderer *renderer)
data->glDisableClientState(GL_TEXTURE_COORD_ARRAY);
}
static int
GLES_SetTargetTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
int w, h;
GLES_TextureData *texturedata = NULL;
GLenum status;
if (!renderer) return -1;
GLES_ActivateRenderer(renderer);
if (! data->GL_OES_framebuffer_object_supported) {
SDL_Unsupported();
return -1;
}
if (texture == NULL) {
if (data->renderTarget != NULL) {
data->renderTarget = NULL;
renderer->viewport = data->viewport_copy;
data->glBindFramebufferOES(GL_FRAMEBUFFER_OES, 0);
data->glMatrixMode(GL_PROJECTION);
data->glLoadIdentity();
data->glMatrixMode(GL_MODELVIEW);
data->glLoadIdentity();
data->glViewport(renderer->viewport.x, renderer->viewport.y, renderer->viewport.w, renderer->viewport.h);
data->glOrthof(0.0, (GLfloat) renderer->viewport.w, (GLfloat) renderer->viewport.h, 0.0, 0.0, 1.0);
}
return 0;
}
if (renderer != texture->renderer) return -1;
if (data->renderTarget==NULL) {
// Keep a copy of the default viewport to restore when texture==NULL
data->viewport_copy = renderer->viewport;
}
texturedata = (GLES_TextureData *) texture->driverdata;
if (!texturedata) {
if (texture->native && texture->native->driverdata) {
texture = texture->native;
texturedata = texture->driverdata;
}
else return -1;
}
data->glBindFramebufferOES(GL_FRAMEBUFFER_OES, texturedata->fbo->FBO);
/* TODO: check if texture pixel format allows this operation */
data->glFramebufferTexture2DOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, texturedata->type, texturedata->texture, 0);
/* Check FBO status */
status = data->glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES);
if (status != GL_FRAMEBUFFER_COMPLETE_OES) {
return -1;
}
data->renderTarget = texture;
renderer->viewport.x = 0;
renderer->viewport.y = 0;
renderer->viewport.w = texture->w;
renderer->viewport.h = texture->h;
data->glMatrixMode(GL_PROJECTION);
data->glLoadIdentity();
data->glOrthof(0.0, (GLfloat) texture->w, 0.0, (GLfloat) texture->h, 0.0, 1.0);
data->glMatrixMode(GL_MODELVIEW);
data->glLoadIdentity();
data->glViewport(0, 0, texture->w, texture->h);
return 0;
}
SDL_Renderer *
GLES_CreateRenderer(SDL_Window * window, Uint32 flags)
{
@ -274,6 +375,7 @@ GLES_CreateRenderer(SDL_Window * window, Uint32 flags)
renderer->info.flags = SDL_RENDERER_ACCELERATED;
renderer->driverdata = data;
renderer->window = window;
renderer->SetTargetTexture = GLES_SetTargetTexture;
data->context = SDL_GL_CreateContext(window);
if (!data->context) {
@ -317,6 +419,12 @@ GLES_CreateRenderer(SDL_Window * window, Uint32 flags)
data->glGetIntegerv(GL_MAX_TEXTURE_SIZE, &value);
renderer->info.max_texture_height = value;
if (SDL_GL_ExtensionSupported("GL_OES_framebuffer_object")) {
data->GL_OES_framebuffer_object_supported = SDL_TRUE;
}
data->framebuffers = NULL;
data->renderTarget = NULL;
/* Set up parameters for rendering */
GLES_ResetState(renderer);
@ -335,7 +443,7 @@ GLES_WindowEvent(SDL_Renderer * renderer, const SDL_WindowEvent *event)
if (event->event == SDL_WINDOWEVENT_MINIMIZED) {
/* According to Apple documentation, we need to finish drawing NOW! */
data->glFinish();
data->glFinish();
}
}
@ -403,6 +511,11 @@ GLES_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
}
texture->driverdata = data;
if (texture->access == SDL_TEXTUREACCESS_TARGET) {
data->fbo = GLES_GetFBO(renderer->driverdata, texture->w, texture->h);
} else {
data->fbo = NULL;
}
renderdata->glGetError();
renderdata->glEnable(GL_TEXTURE_2D);
@ -757,15 +870,26 @@ GLES_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
SDL_Window *window = renderer->window;
SDL_GetWindowSize(window, &w, &h);
cropRect[0] = srcrect->x;
cropRect[1] = srcrect->y + srcrect->h;
cropRect[2] = srcrect->w;
cropRect[3] = -srcrect->h;
data->glTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_CROP_RECT_OES,
cropRect);
data->glDrawTexiOES(renderer->viewport.x + dstrect->x,
h - (renderer->viewport.y + dstrect->y) - dstrect->h, 0,
dstrect->w, dstrect->h);
if (data->renderTarget != NULL) {
cropRect[0] = srcrect->x;
cropRect[1] = srcrect->y;
cropRect[2] = srcrect->w;
cropRect[3] = srcrect->h;
data->glTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_CROP_RECT_OES,
cropRect);
data->glDrawTexiOES(renderer->viewport.x + dstrect->x, renderer->viewport.y + dstrect->y, 0,
dstrect->w, dstrect->h);
} else {
cropRect[0] = srcrect->x;
cropRect[1] = srcrect->y + srcrect->h;
cropRect[2] = srcrect->w;
cropRect[3] = -srcrect->h;
data->glTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_CROP_RECT_OES,
cropRect);
data->glDrawTexiOES(renderer->viewport.x + dstrect->x,
h - (renderer->viewport.y + dstrect->y) - dstrect->h, 0,
dstrect->w, dstrect->h);
}
} else {
minx = dstrect->x;
@ -901,6 +1025,12 @@ GLES_DestroyRenderer(SDL_Renderer * renderer)
if (data) {
if (data->context) {
while (data->framebuffers) {
GLES_FBOList *nextnode = data->framebuffers->next;
data->glDeleteFramebuffersOES(1, &data->framebuffers->FBO);
SDL_free(data->framebuffers);
data->framebuffers = nextnode;
}
SDL_GL_DeleteContext(data->context);
}
SDL_free(data);