Skip to content
Permalink
Browse files

Add conversion routines for unsupported screen formats

  • Loading branch information
pmandin committed Nov 22, 2004
1 parent 3c74a09 commit f322521297f947a318db39eea839769841f96c32
Showing with 106 additions and 4 deletions.
  1. +106 −4 src/video/gem/SDL_gemvideo.c
@@ -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

0 comments on commit f322521

Please sign in to comment.