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glSDL.c
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glSDL.c
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/*(LGPL)
------------------------------------------------------------
glSDL 0.6 - SDL 2D API on top of OpenGL
------------------------------------------------------------
* (c) David Olofson, 2001-2003
* This code is released under the terms of the GNU LGPL.
*/
#define _GLSDL_NO_REDEFINES_
#include "glSDL.h"
#ifdef HAVE_OPENGL
/*
* Note that this will result in whining about
* TexInfo 0 being leaked, as the checking is
* done before the screen is closed. Ignore. :-)
*/
/* #define LEAK_TRACKING */
#define DBG(x) /*error messages, warnings*/
#define DBG2(x) /*texture allocation*/
#define DBG3(x) /*chopping/tiling*/
#define DBG4(x) /*texture uploading*/
/*#define CKSTATS*/ /*colorkey statistics*/
/*#define FAKE_MAXTEXSIZE 256*/
#include <string.h>
#include <stdlib.h>
#include <math.h>
#define HAS_SDL_OPENGL_H 1
#if HAS_SDL_OPENGL_H
#include "SDL_opengl.h"
#else
#ifdef WIN32
#include <windows.h>
#endif
#if defined(__APPLE__) && defined(__MACH__)
#include <OpenGL/gl.h>
#include <OpenGL/glu.h>
#else
#include <GL/gl.h>
#include <GL/glu.h>
#endif
#endif
#define USING_GLSDL (IS_GLSDL_SURFACE(SDL_GetVideoSurface()))
#define MAX_TEXINFOS 16384
static glSDL_TexInfo **texinfotab = NULL;
static GLint maxtexsize = 256;
static SDL_PixelFormat _RGBfmt, _RGBAfmt;
static int screen_was_locked = 0;
static void _UnloadTexture(glSDL_TexInfo *txi);
static int scale = 1;
static SDL_Surface *fake_screen = NULL;
static int _glSDL_BlitGL(SDL_Surface *src, SDL_Rect *srcrect,
SDL_Surface *dst, SDL_Rect *dstrect);
DBG(static void _print_glerror(int point)
{
const char *err = "<unknown>";
switch(glGetError())
{
case GL_NO_ERROR:
return;
case GL_INVALID_ENUM:
err = "GL_INVALID_ENUM";
break;
case GL_INVALID_VALUE:
err = "GL_INVALID_VALUE";
break;
case GL_INVALID_OPERATION:
err = "GL_INVALID_OPERATION";
break;
case GL_STACK_OVERFLOW:
err = "GL_STACK_OVERFLOW";
break;
case GL_STACK_UNDERFLOW:
err = "GL_STACK_UNDERFLOW";
break;
case GL_OUT_OF_MEMORY:
err = "GL_OUT_OF_MEMORY";
break;
default:
err = "<unknown>";
break;
}
fprintf(stderr,"OpenGL error \"%s\" at point %d.\n", err, point);
})
/* Get texinfo for a surface. */
glSDL_TexInfo *glSDL_GetTexInfo(SDL_Surface *surface)
{
if(!surface)
return NULL;
if(!texinfotab)
return NULL;
if(!surface->unused1)
return NULL;
if(surface->unused1 > MAX_TEXINFOS)
return NULL;
return texinfotab[surface->unused1 - 1];
}
/* Allocate a "blank" texinfo for a suface. */
glSDL_TexInfo *glSDL_AllocTexInfo(SDL_Surface *surface)
{
int handle, i;
glSDL_TexInfo *txi;
if(!surface)
return NULL;
if(!texinfotab)
{
texinfotab = (glSDL_TexInfo**)calloc(MAX_TEXINFOS, sizeof(glSDL_TexInfo *));
if(!texinfotab)
return NULL;
}
txi = glSDL_GetTexInfo(surface);
if(txi)
return txi; /* There already is one! --> */
/* Find a free handle... */
handle = -1;
for(i = 0; i < MAX_TEXINFOS; ++i)
if(NULL == texinfotab[i])
{
handle = i;
break;
}
if(handle < 0)
{
DBG(fprintf(stderr, "glSDL: Out of handles!\n"));
return NULL;
}
/* ...and hook a new texinfo struct up to it. */
texinfotab[handle] = (glSDL_TexInfo*)calloc(1, sizeof(glSDL_TexInfo));
if(!texinfotab[handle])
return NULL;
/* Connect the surface to the new TexInfo. */
surface->unused1 = (Uint32)handle + 1;
DBG2(fprintf(stderr, "glSDL: Allocated TexInfo %d.\n", handle));
return texinfotab[handle];
}
static void _FreeTexInfo(Uint32 handle)
{
if(handle >= MAX_TEXINFOS)
return;
if(!texinfotab[handle])
return;
_UnloadTexture(texinfotab[handle]);
texinfotab[handle]->textures = 0;
free(texinfotab[handle]->texture);
texinfotab[handle]->texture = NULL;
free(texinfotab[handle]);
texinfotab[handle] = NULL;
DBG2(fprintf(stderr, "glSDL: Freed TexInfo %d.\n", handle));
}
/* Detach and free the texinfo of a surface. */
void glSDL_FreeTexInfo(SDL_Surface *surface)
{
if(!glSDL_GetTexInfo(surface))
return;
_FreeTexInfo(surface->unused1 - 1);
GLSDL_FIX_SURFACE(surface);
}
/*
* Calculate chopping/tiling of a surface to
* fit it into the smallest possible OpenGL
* texture.
*/
static int _CalcChop(glSDL_TexInfo *txi)
{
int rows, vw, vh;
int vertical = 0;
int texsize;
int lastw, lasth, minsize;
vw = txi->virt.w;
vh = txi->virt.h;
DBG3(fprintf(stderr, "w=%d, h=%d ", vw, vh));
if(vh > vw)
{
int t = vw;
vw = vh;
vh = t;
vertical = 1;
DBG3(fprintf(stderr, "(vertical) \t"));
}
/*
* Check whether this is a "huge" surface - at least one dimension
* must be <= than the maximum texture size, or we'll have to chop
* in both directions.
*/
if(vh > maxtexsize)
{
fprintf(stderr, "glSDL: \"Huge\" surfaces not yet supported!\n");
return 0;
}
/* Calculate minimum size */
rows = 1;
lastw = vw;
lasth = vh;
minsize = lastw > lasth ? lastw : lasth;
while(1)
{
int w, h, size;
++rows;
w = vw / rows;
h = rows * vh;
size = w > h ? w : h;
if(size >= minsize)
{
--rows;
break;
}
minsize = size;
}
if(minsize > maxtexsize)
{
/* Handle multiple textures for very wide/tall surfaces. */
minsize = maxtexsize;
DBG3(rows = (vw + minsize-1) / minsize);
}
DBG3(fprintf(stderr, "==> minsize=%d ", minsize));
DBG3(fprintf(stderr, "(rows=%d) \t", rows));
/* Recalculate with nearest higher power-of-2 width. */
for(texsize = 1; texsize < minsize; texsize <<= 1)
;
txi->texsize = texsize;
rows = (vw + texsize-1) / texsize;
DBG3(fprintf(stderr, "==> texsize=%d (rows=%d) \t", texsize, rows));
/* Calculate number of tiles per texture */
txi->tilespertex = txi->texsize / vh;
DBG3(fprintf(stderr, "tilespertex=%d \t", txi->tilespertex));
/* Calculate number of textures needed */
txi->textures = (rows + txi->tilespertex-1) / txi->tilespertex;
txi->texture = (int*)malloc(txi->textures * sizeof(int));
memset(txi->texture, -1, txi->textures * sizeof(int));
DBG3(fprintf(stderr, "textures=%d, ", txi->textures));
if(!txi->texture)
{
fprintf(stderr, "glSDL: INTERNAL ERROR: Failed to allocate"
" texture name table!\n");
return -2;
}
/* Set up tile size. (Only one axis supported here!) */
if(1 == rows)
{
txi->tilemode = GLSDL_TM_SINGLE;
if(vertical)
{
txi->tilew = vh;
txi->tileh = vw;
}
else
{
txi->tilew = vw;
txi->tileh = vh;
}
}
else if(vertical)
{
txi->tilemode = GLSDL_TM_VERTICAL;
txi->tilew = vh;
txi->tileh = texsize;
}
else
{
txi->tilemode = GLSDL_TM_HORIZONTAL;
txi->tilew = texsize;
txi->tileh = vh;
}
DBG3(fprintf(stderr, "tilew=%d, tileh=%d\n", txi->tilew, txi->tileh));
return 0;
}
/*
TODO:
* Keep a list or tree of free texture space rectangles.
* The space manager should actively try to merge
rectangles from the same texture.
static int _AllocTexSpace(glSDL_TexInfo *txi)
{
Make sure that _CalcChop() has been called.
Try to find the smallest free area (one or more
tiles) in a single texture that would fit all
tiles of this surface.
if that fails
{
Allocate a new texture of suitable size.
if that fails
{
Try to allocate space for each tile separately.
if that fails
return error -->
}
}
Allocate the areas and link them to the texinfo.
return success -->
}
*/
/* Add a glSDL_TexInfo struct to an SDL_Surface */
static int glSDL_AddTexInfo(SDL_Surface *surface)
{
glSDL_TexInfo *txi;
if(!surface)
return -1;
if(IS_GLSDL_SURFACE(surface))
return 0; /* Do nothing */
glSDL_AllocTexInfo(surface);
txi = glSDL_GetTexInfo(surface);
if(!txi)
return -2; /* Oops! Didn't get a texinfo... --> */
txi->virt.w = txi->lw = surface->w;
txi->virt.h = txi->lh = surface->h;
if(_CalcChop(txi) < 0)
return -3;
SDL_SetClipRect(surface, &txi->virt);
return 0;
}
/* Create a surface of the prefered OpenGL RGB texture format */
static SDL_Surface *_CreateRGBSurface(int w, int h)
{
SDL_Surface *s;
Uint32 rmask, gmask, bmask;
int bits = 24;
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
rmask = 0x00ff0000;
gmask = 0x0000ff00;
bmask = 0x000000ff;
#else
rmask = 0x000000ff;
gmask = 0x0000ff00;
bmask = 0x00ff0000;
#endif
s = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h,
bits, rmask, gmask, bmask, 0);
if(s)
GLSDL_FIX_SURFACE(s);
glSDL_AddTexInfo(s);
return s;
}
/* Create a surface of the prefered OpenGL RGBA texture format */
static SDL_Surface *_CreateRGBASurface(int w, int h)
{
SDL_Surface *s;
Uint32 rmask, gmask, bmask, amask;
int bits = 32;
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
rmask = 0xff000000;
gmask = 0x00ff0000;
bmask = 0x0000ff00;
amask = 0x000000ff;
#else
rmask = 0x000000ff;
gmask = 0x0000ff00;
bmask = 0x00ff0000;
amask = 0xff000000;
#endif
s = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h,
bits, rmask, gmask, bmask, amask);
if(s)
GLSDL_FIX_SURFACE(s);
glSDL_AddTexInfo(s);
return s;
}
static void _init_formats(void)
{
SDL_Surface *s = _CreateRGBSurface(1, 1);
if(!s)
return;
_RGBfmt = *(s->format);
glSDL_FreeSurface(s);
s = _CreateRGBASurface(1, 1);
if(!s)
return;
_RGBAfmt = *(s->format);
glSDL_FreeSurface(s);
}
static int _FormatIsOk(SDL_Surface *surface)
{
SDL_PixelFormat *pf;
if(!surface)
return 1; /* Well, there ain't much we can do anyway... */
pf = surface->format;
/* Colorkeying requires an alpha channel! */
if(surface->flags & SDL_SRCCOLORKEY)
if(!pf->Amask)
return 0;
/* We need pitch == (width * BytesPerPixel) for glTex[Sub]Image2D() */
if(surface->pitch != (surface->w * pf->BytesPerPixel))
return 0;
if(pf->Amask)
{
if(pf->BytesPerPixel != _RGBAfmt.BytesPerPixel)
return 0;
if(pf->Rmask != _RGBAfmt.Rmask)
return 0;
if(pf->Gmask != _RGBAfmt.Gmask)
return 0;
if(pf->Bmask != _RGBAfmt.Bmask)
return 0;
if(pf->Amask != _RGBAfmt.Amask)
return 0;
}
else
{
if(pf->BytesPerPixel != _RGBfmt.BytesPerPixel)
return 0;
if(pf->Rmask != _RGBfmt.Rmask)
return 0;
if(pf->Gmask != _RGBfmt.Gmask)
return 0;
if(pf->Bmask != _RGBfmt.Bmask)
return 0;
}
return 1;
}
static void _key2alpha(SDL_Surface *surface)
{
int x, y;
#ifdef CKSTATS
int transp = 0;
#endif
Uint32 ckey = surface->format->colorkey;
if(SDL_LockSurface(surface) < 0)
return;
for(y = 0; y < surface->h; ++y)
{
Uint32 *px = (Uint32 *)((char *)surface->pixels + y*surface->pitch);
for(x = 0; x < surface->w; ++x)
if(px[x] == ckey)
{
px[x] = 0;
#ifdef CKSTATS
++transp;
#endif
}
}
#ifdef CKSTATS
printf("glSDL: key2alpha(); %dx%d surface, %d opaque pixels.\n",
surface->w, surface->h,
surface->w * surface->h - transp);
#endif
SDL_UnlockSurface(surface);
}
/*----------------------------------------------------------
SDL style API
----------------------------------------------------------*/
static void _KillAllTextures(void)
{
if(texinfotab)
{
unsigned i;
#ifdef LEAK_TRACKING
int leaked = 0;
for(i = 0; i < MAX_TEXINFOS; ++i)
if(texinfotab[i])
{
++leaked;
fprintf(stderr, "glSDL: Leaked TexInfo"
" %d! (%dx%d)\n",
i,
texinfotab[i]->virt.w,
texinfotab[i]->virt.h
);
}
if(leaked)
fprintf(stderr, "glSDL: Leaked %d TexInfos!\n", leaked);
#endif
for(i = 0; i < MAX_TEXINFOS; ++i)
_FreeTexInfo(i);
free(texinfotab);
texinfotab = NULL;
}
}
void glSDL_Quit(void)
{
if(SDL_WasInit(SDL_INIT_VIDEO))
{
SDL_Surface *screen = SDL_GetVideoSurface();
glSDL_FreeTexInfo(screen);
SDL_QuitSubSystem(SDL_INIT_VIDEO);
if(fake_screen)
{
glSDL_FreeTexInfo(fake_screen);
free(fake_screen);
fake_screen = NULL;
}
}
#ifndef LEAK_TRACKING
_KillAllTextures();
#endif
}
void _glSDL_FullQuit(void)
{
#ifdef LEAK_TRACKING
_KillAllTextures();
#endif
glSDL_Quit();
SDL_Quit();
}
void glSDL_QuitSubSystem(Uint32 flags)
{
if(flags & SDL_INIT_VIDEO)
glSDL_Quit();
SDL_QuitSubSystem(flags);
}
SDL_Surface *glSDL_SetVideoMode(int width, int height, int bpp, Uint32 flags)
{
SDL_Surface *screen;
GLint gl_doublebuf;
if(!(flags & SDL_GLSDL))
{
screen = SDL_SetVideoMode(width, height, bpp, flags);
if(screen)
GLSDL_FIX_SURFACE(screen);
return screen;
}
if((SDL_Linked_Version()->major <= 1) &&
(SDL_Linked_Version()->minor <= 2) &&
(SDL_Linked_Version()->patch < 5))
fprintf(stderr, "glSDL WARNING: Using SDL version"
" 1.2.5 or later is strongly"
" recommended!\n");
/*
* FIXME: Here's the place to insert proper handling of this call being
* used for resizing the window... For now, just make sure we
* don't end up with invalid texinfos and stuff no matter what.
*/
_KillAllTextures();
/* Remove flag to avoid confusion inside SDL - just in case! */
flags &= ~SDL_GLSDL;
flags |= SDL_OPENGL;
if(bpp == 15)
{
SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 5);
SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 5);
SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 5);
}
else if(bpp == 16)
{
SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 5);
SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 6);
SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 5);
}
else if(bpp >= 24)
{
SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
}
gl_doublebuf = flags & SDL_DOUBLEBUF;
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, gl_doublebuf);
DBG(printf("desired = %d x %d\n", width, height);)
scale = 1;
while((width*scale < 640) && (height*scale < 480))
++scale;
DBG(printf("real = %d x %d\n", width*scale, height*scale);)
screen = SDL_SetVideoMode(width*scale, height*scale, bpp, flags);
if(!screen)
return NULL;
GLSDL_FIX_SURFACE(screen);
#ifdef FAKE_MAXTEXSIZE
maxtexsize = FAKE_MAXTEXSIZE;
#else
glGetIntegerv(GL_MAX_TEXTURE_SIZE, &maxtexsize);
#endif
DBG(fprintf(stderr, "glSDL: Max texture size: %d\n", maxtexsize));
_init_formats();
if(glSDL_AddTexInfo(screen) < 0)
{
DBG(fprintf(stderr, "glSDL: Failed to add info to screen surface!\n"));
SDL_QuitSubSystem(SDL_INIT_VIDEO);
return NULL;
}
glSDL_SetLogicSize(screen, width*scale, height*scale);
/*
* Create a software shadow buffer of the requested size.
* This is used for blit-from-screen and simulation of
* direct software rendering. (Dog slow crap. It's only
* legitimate use is probably screen shots.)
*/
fake_screen = _CreateRGBSurface(screen->w / scale,
screen->h / scale);
return fake_screen;
}
SDL_Surface *glSDL_GetVideoSurface(void)
{
if(fake_screen)
return fake_screen;
else
return SDL_GetVideoSurface();
}
void glSDL_UpdateRects(SDL_Surface *screen, int numrects, SDL_Rect *rects)
{
if(IS_GLSDL_SURFACE(screen))
{
/* if(screen_was_locked)
{
int i;
for(i = 0; i < numrects; ++i)
_glSDL_BlitGL(fake_screen, rects + i,
vs, rects + i);
}
else
*/
glSDL_Flip(screen);
}
else
SDL_UpdateRects(screen, numrects, rects);
screen_was_locked = 0;
}
void glSDL_UpdateRect(SDL_Surface *screen, Sint32 x, Sint32 y, Uint32 w, Uint32 h)
{
SDL_Rect r;
r.x = x;
r.y = y;
r.w = w;
r.h = h;
glSDL_UpdateRects(screen, 1, &r);
}
int glSDL_Flip(SDL_Surface *screen)
{
if(!IS_GLSDL_SURFACE(screen))
return SDL_Flip(screen);
/*
TODO: Perform all rendering here, after globally reordering/optimizing
all non-overlapping operations for the frame. (Reduce texture
changes, blend mode changes etc...)
Disadvantage:
Won't mix well with user OpenGL calls - but then again, glSDL
isn't meant for OpenGL aware applications in the first place!
*/
/*
* Some XFree86 DRI drivers won't sync *at all*
* without glFinish()! You may end up with commands
* for several frames buffered up before any actual
* rendering is done - and then, your program will
* stall until most of the rendering is completed.
*
* (Of course, this wouldn't be much of an issue
* if the drivers did retrace sync'ed flips, but as
* most of the drivers don't, there's no way ever an
* application is going to get smooth animation
* without this kludge.)
*
* Update: That bl**dy *DRIVER* should be fixed!
* We don't need this performance killing
* kludge. (I know for sure that my current
* driver doesn't have this problem.)
*/
#ifdef STUPID_GL_WORKAROUND
glFlush(); /* Just in case. *heh* */
SDL_GL_SwapBuffers();
glFinish(); /* And here we kill parallel execution... :-( */
#else
SDL_GL_SwapBuffers();
#endif
return 0;
}
void glSDL_FreeSurface(SDL_Surface *surface)
{
if(!surface)
return;
glSDL_FreeTexInfo(surface);
SDL_FreeSurface(surface);
}
int glSDL_LockSurface(SDL_Surface *surface)
{
if(!surface)
return 0;
if(IS_GLSDL_SURFACE(surface))
{
if((surface == fake_screen) ||
(SDL_GetVideoSurface() == surface))
{
if(scale > 1)
return -1;
glSDL_Invalidate(fake_screen, NULL);
glPixelStorei(GL_UNPACK_ROW_LENGTH,
fake_screen->pitch /
fake_screen->format->BytesPerPixel);
glReadPixels(0, 0, fake_screen->w, fake_screen->h,
GL_RGB, GL_UNSIGNED_BYTE,
fake_screen->pixels);
return 0;
}
else
{
glSDL_Invalidate(surface, NULL);
return SDL_LockSurface(surface);
}
}
else
return SDL_LockSurface(surface);
}
void glSDL_UnlockSurface(SDL_Surface *surface)
{
if(!surface)
return;
if(IS_GLSDL_SURFACE(surface))
{
glSDL_UploadSurface(surface);
if((surface == fake_screen) ||
(SDL_GetVideoSurface() == surface))
_glSDL_BlitGL(fake_screen, NULL,
SDL_GetVideoSurface(), NULL);
}
else
SDL_UnlockSurface(surface);
}
int glSDL_SetColorKey(SDL_Surface *surface, Uint32 flag, Uint32 key)
{
int res = SDL_SetColorKey(surface, flag, key);
if(res < 0)
return res;
/*
* If an application does this *after* SDL_DisplayFormat,
* we're basically screwed, unless we want to do an
* in-place surface conversion hack here.
*
* What we do is just kill the glSDL texinfo... No big
* deal in most cases, as glSDL only converts once anyway,
* *unless* you keep modifying the surface.
*/
if(IS_GLSDL_SURFACE(surface))
glSDL_FreeTexInfo(surface);
return res;
}
int glSDL_SetAlpha(SDL_Surface *surface, Uint32 flag, Uint8 alpha)
{
/*
* This is just parameters to OpenGL, so the actual
* "work" is done in glSDL_BlitSurface().
*/
return SDL_SetAlpha(surface, flag, alpha);
}
SDL_bool glSDL_SetClipRect(SDL_Surface *surface, SDL_Rect *rect)
{
SDL_bool res;
SDL_Surface *screen;
SDL_Rect fsr;
if(!surface)
return SDL_FALSE;
screen = SDL_GetVideoSurface();
res = SDL_SetClipRect(surface, rect);
if(!res)
return SDL_FALSE;
if(!rect)
{
fsr.x = 0;
fsr.y = 0;
fsr.w = screen->w;
fsr.h = screen->h;
rect = &fsr;
}
if(surface == fake_screen)
{
SDL_Rect r;
r.x = rect->x * scale;
r.y = rect->y * scale;
r.w = rect->w * scale;
r.h = rect->h * scale;
surface = screen;
SDL_SetClipRect(surface, &r);
}
if( (screen == surface) &&
IS_GLSDL_SURFACE(surface) )
{
float xscale, yscale;
glSDL_TexInfo *txi = glSDL_GetTexInfo(surface);
rect = &surface->clip_rect;
glViewport( rect->x * scale,
screen->h - (rect->y + rect->h) * scale,
rect->w * scale,
rect->h * scale);
/*
* Note that this projection is upside down in
* relation to the OpenGL coordinate system.
*/
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
xscale = (float)txi->lw / (float)surface->w;
yscale = (float)txi->lh / (float)surface->h;
glOrtho( xscale*(float)rect->x,
xscale*(float)(rect->w+rect->x),
yscale*(float)(rect->h+rect->y),
yscale*(float)rect->y,
-1.0, 1.0);
return SDL_TRUE;
}
return res;
}
static struct
{
int do_blend;
int do_texture;
GLint texture;
GLenum sfactor, dfactor;
} glstate;
static void gl_reset(void)
{
glstate.do_blend = -1;
glstate.do_blend = -1;
glstate.texture = -1;
glstate.sfactor = 0xffffffff;
glstate.dfactor = 0xffffffff;
}
static __inline__ void gl_do_blend(int on)
{
if(glstate.do_blend == on)
return;
if(on)
glEnable(GL_BLEND);
else
glDisable(GL_BLEND);
glstate.do_blend = on;
}
static __inline__ void gl_do_texture(int on)
{
if(glstate.do_texture == on)
return;
if(on)
glEnable(GL_TEXTURE_2D);
else
glDisable(GL_TEXTURE_2D);
glstate.do_texture = on;
}
static __inline__ void gl_blendfunc(GLenum sfactor, GLenum dfactor)
{
if((sfactor == glstate.sfactor) && (dfactor == glstate.dfactor))
return;
glBlendFunc(sfactor, dfactor);
glstate.sfactor = sfactor;
glstate.dfactor = dfactor;
}
static __inline__ void gl_texture(GLint tx)
{
if(tx == glstate.texture)
return;
glBindTexture(GL_TEXTURE_2D, tx);
glstate.texture = tx;
}
static int _glSDL_BlitFromGL(SDL_Rect *srcrect,
SDL_Surface *dst, SDL_Rect *dstrect)
{
int i, sy0, dy0;
SDL_Rect sr, dr;
if(scale > 1)
return -1;
/*
FIXME: Some clipping, perhaps...? :-)
*/
/* In case the destination has an OpenGL texture... */
glSDL_Invalidate(dst, dstrect);
/* Abuse the fake screen buffer a little. */
glPixelStorei(GL_UNPACK_ROW_LENGTH, fake_screen->pitch /
fake_screen->format->BytesPerPixel);