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Factorize OSMesa OpenGL code for Atari drivers
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/* | ||
SDL - Simple DirectMedia Layer | ||
Copyright (C) 1997-2004 Sam Lantinga | ||
This library is free software; you can redistribute it and/or | ||
modify it under the terms of the GNU Library General Public | ||
License as published by the Free Software Foundation; either | ||
version 2 of the License, or (at your option) any later version. | ||
This library is distributed in the hope that it will be useful, | ||
but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
Library General Public License for more details. | ||
You should have received a copy of the GNU Library General Public | ||
License along with this library; if not, write to the Free | ||
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
Sam Lantinga | ||
slouken@libsdl.org | ||
*/ | ||
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/* Atari OSMesa.ldg implementation of SDL OpenGL support */ | ||
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/*--- Includes ---*/ | ||
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#ifdef HAVE_OPENGL | ||
#include <GL/osmesa.h> | ||
#endif | ||
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#include "SDL_video.h" | ||
#include "SDL_error.h" | ||
#include "SDL_endian.h" | ||
#include "SDL_atarigl_c.h" | ||
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/*--- Variables ---*/ | ||
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/*--- Functions prototypes ---*/ | ||
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static void ConvertNull(SDL_Surface *surface); | ||
static void Convert565To555be(SDL_Surface *surface); | ||
static void Convert565To555le(SDL_Surface *surface); | ||
static void Convert565le(SDL_Surface *surface); | ||
static void ConvertBGRAToABGR(SDL_Surface *surface); | ||
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/*--- Public functions ---*/ | ||
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int SDL_AtariGL_Init(_THIS, SDL_Surface *current) | ||
{ | ||
#ifdef HAVE_OPENGL | ||
GLenum osmesa_format; | ||
SDL_PixelFormat *pixel_format; | ||
Uint32 redmask; | ||
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SDL_AtariGL_Quit(this); /* Destroy previous context if exist */ | ||
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/* Init OpenGL context using OSMesa */ | ||
gl_convert = ConvertNull; | ||
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pixel_format = current->format; | ||
redmask = pixel_format->Rmask; | ||
switch (pixel_format->BitsPerPixel) { | ||
case 15: | ||
/* 1555, big and little endian, unsupported */ | ||
osmesa_format = OSMESA_RGB_565; | ||
if (redmask == 31<<10) { | ||
gl_convert = Convert565To555be; | ||
} else { | ||
gl_convert = Convert565To555le; | ||
} | ||
break; | ||
case 16: | ||
if (redmask == 31<<11) { | ||
osmesa_format = OSMESA_RGB_565; | ||
} else { | ||
/* 565, little endian, unsupported */ | ||
osmesa_format = OSMESA_RGB_565; | ||
gl_convert = Convert565le; | ||
} | ||
break; | ||
case 24: | ||
if (redmask == 255<<16) { | ||
osmesa_format = OSMESA_RGB; | ||
} else { | ||
osmesa_format = OSMESA_BGR; | ||
} | ||
break; | ||
case 32: | ||
if (redmask == 255<<16) { | ||
osmesa_format = OSMESA_ARGB; | ||
} else if (redmask == 255<<8) { | ||
osmesa_format = OSMESA_BGRA; | ||
} else if (redmask == 255<<24) { | ||
osmesa_format = OSMESA_RGBA; | ||
} else { | ||
/* ABGR format unsupported */ | ||
osmesa_format = OSMESA_BGRA; | ||
gl_convert = ConvertBGRAToABGR; | ||
} | ||
break; | ||
default: | ||
osmesa_format = OSMESA_COLOR_INDEX; | ||
break; | ||
} | ||
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gl_ctx = OSMesaCreateContextExt( osmesa_format, this->gl_config.depth_size, | ||
this->gl_config.stencil_size, this->gl_config.accum_red_size + | ||
this->gl_config.accum_green_size + this->gl_config.accum_blue_size + | ||
this->gl_config.accum_alpha_size, NULL ); | ||
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gl_active = (gl_ctx != NULL); | ||
return (gl_active); | ||
#else | ||
return 0; | ||
#endif | ||
} | ||
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void SDL_AtariGL_Quit(_THIS) | ||
{ | ||
#ifdef HAVE_OPENGL | ||
/* Shutdown OpenGL context */ | ||
if (gl_ctx) { | ||
OSMesaDestroyContext(gl_ctx); | ||
gl_ctx = NULL; | ||
} | ||
#endif | ||
gl_active = 0; | ||
} | ||
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int SDL_AtariGL_LoadLibrary(_THIS, const char *path) | ||
{ | ||
#ifdef HAVE_OPENGL | ||
/* Library is always opened */ | ||
this->gl_config.driver_loaded = 1; | ||
#endif | ||
return 0; | ||
} | ||
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void *SDL_AtariGL_GetProcAddress(_THIS, const char *proc) | ||
{ | ||
void *func = NULL; | ||
#ifdef HAVE_OPENGL | ||
if (gl_ctx != NULL) { | ||
func = OSMesaGetProcAddress(proc); | ||
} | ||
#endif | ||
return func; | ||
} | ||
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int SDL_AtariGL_GetAttribute(_THIS, SDL_GLattr attrib, int* value) | ||
{ | ||
#ifdef HAVE_OPENGL | ||
GLenum mesa_attrib; | ||
SDL_Surface *surface; | ||
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if (gl_ctx == NULL) { | ||
return -1; | ||
} | ||
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switch(attrib) { | ||
case SDL_GL_RED_SIZE: | ||
mesa_attrib = GL_RED_BITS; | ||
break; | ||
case SDL_GL_GREEN_SIZE: | ||
mesa_attrib = GL_GREEN_BITS; | ||
break; | ||
case SDL_GL_BLUE_SIZE: | ||
mesa_attrib = GL_BLUE_BITS; | ||
break; | ||
case SDL_GL_ALPHA_SIZE: | ||
mesa_attrib = GL_ALPHA_BITS; | ||
break; | ||
case SDL_GL_DOUBLEBUFFER: | ||
surface = this->screen; | ||
*value = ((surface->flags & SDL_DOUBLEBUF)==SDL_DOUBLEBUF); | ||
return 0; | ||
case SDL_GL_DEPTH_SIZE: | ||
mesa_attrib = GL_DEPTH_BITS; | ||
break; | ||
case SDL_GL_STENCIL_SIZE: | ||
mesa_attrib = GL_STENCIL_BITS; | ||
break; | ||
case SDL_GL_ACCUM_RED_SIZE: | ||
mesa_attrib = GL_ACCUM_RED_BITS; | ||
break; | ||
case SDL_GL_ACCUM_GREEN_SIZE: | ||
mesa_attrib = GL_ACCUM_GREEN_BITS; | ||
break; | ||
case SDL_GL_ACCUM_BLUE_SIZE: | ||
mesa_attrib = GL_ACCUM_BLUE_BITS; | ||
break; | ||
case SDL_GL_ACCUM_ALPHA_SIZE: | ||
mesa_attrib = GL_ACCUM_ALPHA_BITS; | ||
break; | ||
default : | ||
return -1; | ||
} | ||
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glGetIntegerv(mesa_attrib, value); | ||
return 0; | ||
#else | ||
return -1; | ||
#endif | ||
} | ||
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int SDL_AtariGL_MakeCurrent(_THIS) | ||
{ | ||
#ifdef HAVE_OPENGL | ||
SDL_Surface *surface; | ||
GLenum type; | ||
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if (gl_ctx == NULL) { | ||
SDL_SetError("Invalid OpenGL context"); | ||
return -1; | ||
} | ||
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surface = this->screen; | ||
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if ((surface->format->BitsPerPixel == 15) || (surface->format->BitsPerPixel == 16)) { | ||
type = GL_UNSIGNED_SHORT_5_6_5; | ||
} else { | ||
type = GL_UNSIGNED_BYTE; | ||
} | ||
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if (!OSMesaMakeCurrent(gl_ctx, surface->pixels, type, surface->w, surface->h)) { | ||
SDL_SetError("Can not make OpenGL context current"); | ||
return -1; | ||
} | ||
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/* OSMesa draws upside down */ | ||
OSMesaPixelStore(OSMESA_Y_UP, 0); | ||
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return 0; | ||
#else | ||
return -1; | ||
#endif | ||
} | ||
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void SDL_AtariGL_SwapBuffers(_THIS) | ||
{ | ||
#ifdef HAVE_OPENGL | ||
if (gl_ctx == NULL) { | ||
return; | ||
} | ||
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gl_convert(this->screen); | ||
#endif | ||
} | ||
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/*--- Private functions ---*/ | ||
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static void ConvertNull(SDL_Surface *surface) | ||
{ | ||
} | ||
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static void Convert565To555be(SDL_Surface *surface) | ||
{ | ||
int x,y, pitch; | ||
unsigned short *line, *pixel; | ||
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line = surface->pixels; | ||
pitch = surface->pitch >> 1; | ||
for (y=0; y<surface->h; y++) { | ||
pixel = line; | ||
for (x=0; x<surface->w; x++) { | ||
unsigned short color = *pixel; | ||
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*pixel++ = (color & 0x1f)|((color>>1) & 0xffe0); | ||
} | ||
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line += pitch; | ||
} | ||
} | ||
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static void Convert565To555le(SDL_Surface *surface) | ||
{ | ||
int x,y, pitch; | ||
unsigned short *line, *pixel; | ||
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line = surface->pixels; | ||
pitch = surface->pitch >>1; | ||
for (y=0; y<surface->h; y++) { | ||
pixel = line; | ||
for (x=0; x<surface->w; x++) { | ||
unsigned short color = *pixel; | ||
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color = (color & 0x1f)|((color>>1) & 0xffe0); | ||
*pixel++ = SDL_Swap16(color); | ||
} | ||
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line += pitch; | ||
} | ||
} | ||
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static void Convert565le(SDL_Surface *surface) | ||
{ | ||
int x,y, pitch; | ||
unsigned short *line, *pixel; | ||
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line = surface->pixels; | ||
pitch = surface->pitch >>1; | ||
for (y=0; y<surface->h; y++) { | ||
pixel = line; | ||
for (x=0; x<surface->w; x++) { | ||
unsigned short color = *pixel; | ||
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*pixel++ = SDL_Swap16(color); | ||
} | ||
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line += pitch; | ||
} | ||
} | ||
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static void ConvertBGRAToABGR(SDL_Surface *surface) | ||
{ | ||
int x,y, pitch; | ||
unsigned long *line, *pixel; | ||
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line = surface->pixels; | ||
pitch = surface->pitch >>2; | ||
for (y=0; y<surface->h; y++) { | ||
pixel = line; | ||
for (x=0; x<surface->w; x++) { | ||
unsigned long color = *pixel; | ||
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*pixel++ = (color<<24)|(color>>8); | ||
} | ||
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line += pitch; | ||
} | ||
} |
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