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Add conversion routines for unsupported screen formats

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This commit is contained in:
Patrice Mandin 2004-11-22 10:18:04 +00:00
parent 05034eabf2
commit 1f07ed4880
1 changed files with 106 additions and 4 deletions
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110
src/video/gem/SDL_gemvideo.c
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@ -51,6 +51,7 @@ static char rcsid =
#include "SDL_error.h"
#include "SDL_video.h"
#include "SDL_mouse.h"
#include "SDL_endian.h"
#include "SDL_sysvideo.h"
#include "SDL_pixels_c.h"
#include "SDL_events_c.h"
@ -118,6 +119,14 @@ static void *GEM_GL_GetProcAddress(_THIS, const char *proc);
static int GEM_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value);
static int GEM_GL_MakeCurrent(_THIS);
static void GEM_GL_SwapBuffers(_THIS);
static void GEM_GL_ConvertNull(SDL_Surface *surface);
static void GEM_GL_Convert565To555be(SDL_Surface *surface);
static void GEM_GL_Convert565To555le(SDL_Surface *surface);
static void GEM_GL_Convert565le(SDL_Surface *surface);
static void GEM_GL_ConvertBGRAToABGR(SDL_Surface *surface);
static void (*GEM_GL_Convert)(SDL_Surface *surface);
#endif
/* GEM driver bootstrap functions */
@ -751,17 +760,29 @@ SDL_Surface *GEM_SetVideoMode(_THIS, SDL_Surface *current,
#ifdef HAVE_OPENGL
if (flags & SDL_OPENGL) {
GLenum format = OSMESA_COLOR_INDEX;
int conversion_needed = 0;
GLenum format = OSMESA_COLOR_INDEX; /* 8 bits */
/* Init OpenGL context using OSMesa */
GEM_GL_Convert = GEM_GL_ConvertNull;
switch (VDI_bpp) {
case 15:
/* 1555, big and little endian unsupported */
/* 1555, big and little endian, unsupported */
format = OSMESA_RGB_565;
if (VDI_redmask == 31<<10) {
GEM_GL_Convert = GEM_GL_Convert565To555be;
} else {
GEM_GL_Convert = GEM_GL_Convert565To555le;
}
break;
case 16:
format = OSMESA_RGB_565;
/* 565, little endian unsupported */
if (VDI_redmask == 31<<11) {
format = OSMESA_RGB_565;
} else {
/* 565, little endian, unsupported */
format = OSMESA_RGB_565;
GEM_GL_Convert = GEM_GL_Convert565le;
}
break;
case 24:
if (VDI_redmask == 255<<16) {
@ -780,6 +801,7 @@ SDL_Surface *GEM_SetVideoMode(_THIS, SDL_Surface *current,
} else {
/* ABGR format unsupported */
format = OSMESA_BGRA;
GEM_GL_Convert = GEM_GL_ConvertBGRAToABGR;
}
break;
}
@ -1434,7 +1456,87 @@ static int GEM_GL_MakeCurrent(_THIS)
static void GEM_GL_SwapBuffers(_THIS)
{
GEM_GL_Convert(this->screen);
GEM_FlipHWSurface(this, this->screen);
}
static void GEM_GL_ConvertNull(SDL_Surface *surface)
{
}
static void GEM_GL_Convert565To555be(SDL_Surface *surface)
{
int x,y, pitch;
unsigned short *line, *pixel;
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;
*pixel++ = (color & 0x1f)|((color>>1) & 0xffe0);
}
line += pitch;
}
}
static void GEM_GL_Convert565To555le(SDL_Surface *surface)
{
int x,y, pitch;
unsigned short *line, *pixel;
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;
color = (color & 0x1f)|((color>>1) & 0xffe0);
*pixel++ = SDL_Swap16(color);
}
line += pitch;
}
}
static void GEM_GL_Convert565le(SDL_Surface *surface)
{
int x,y, pitch;
unsigned short *line, *pixel;
line = surface->pixels;
pitch = surface->pitch >>1;
for (y=0; y<surface->h; y++) {
pixel = line;
for (x=0; x<surface->w; x++) {
*pixel++ = SDL_Swap16(*pixel);
}
line += pitch;
}
}
static void GEM_GL_ConvertBGRAToABGR(SDL_Surface *surface)
{
int x,y, pitch;
unsigned long *line, *pixel;
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;
*pixel++ = (color<<24)|(color>>8);
}
line += pitch;
}
}
#endif