mirror of
https://github.com/libsdl-org/SDL.git
synced 2025-10-18 07:41:45 +00:00
Support proper mode switching on RISC OS
This commit is contained in:
Cameron Cawley
committed by
Sam Lantinga
Sam Lantinga
parent
fe9bb74764
commit
f8a8ca3e1f
255
src/video/riscos/SDL_riscosmodes.c
Normal file
255
src/video/riscos/SDL_riscosmodes.c
Normal file
@@ -0,0 +1,255 @@
|
||||
/*
|
||||
Simple DirectMedia Layer
|
||||
Copyright (C) 1997-2021 Sam Lantinga <slouken@libsdl.org>
|
||||
|
||||
This software is provided 'as-is', without any express or implied
|
||||
warranty. In no event will the authors be held liable for any damages
|
||||
arising from the use of this software.
|
||||
|
||||
Permission is granted to anyone to use this software for any purpose,
|
||||
including commercial applications, and to alter it and redistribute it
|
||||
freely, subject to the following restrictions:
|
||||
|
||||
1. The origin of this software must not be misrepresented; you must not
|
||||
claim that you wrote the original software. If you use this software
|
||||
in a product, an acknowledgment in the product documentation would be
|
||||
appreciated but is not required.
|
||||
2. Altered source versions must be plainly marked as such, and must not be
|
||||
misrepresented as being the original software.
|
||||
3. This notice may not be removed or altered from any source distribution.
|
||||
*/
|
||||
#include "../../SDL_internal.h"
|
||||
|
||||
#if SDL_VIDEO_DRIVER_RISCOS
|
||||
|
||||
#include "../SDL_sysvideo.h"
|
||||
|
||||
#include "SDL_riscosvideo.h"
|
||||
#include "SDL_riscosmodes.h"
|
||||
|
||||
#include <kernel.h>
|
||||
#include <swis.h>
|
||||
|
||||
enum {
|
||||
MODE_FLAG_565 = 1 << 7,
|
||||
|
||||
MODE_FLAG_COLOUR_SPACE = 0xF << 12,
|
||||
|
||||
MODE_FLAG_TBGR = 0,
|
||||
MODE_FLAG_TRGB = 1 << 14,
|
||||
MODE_FLAG_ABGR = 1 << 15,
|
||||
MODE_FLAG_ARGB = MODE_FLAG_TRGB | MODE_FLAG_ABGR
|
||||
};
|
||||
|
||||
static const struct {
|
||||
SDL_PixelFormatEnum pixel_format;
|
||||
int modeflags, ncolour, log2bpp;
|
||||
} mode_to_pixelformat[] = {
|
||||
/* { SDL_PIXELFORMAT_INDEX1LSB, 0, 1, 0 }, */
|
||||
/* { SDL_PIXELFORMAT_INDEX2LSB, 0, 3, 1 }, */
|
||||
/* { SDL_PIXELFORMAT_INDEX4LSB, 0, 15, 2 }, */
|
||||
/* { SDL_PIXELFORMAT_INDEX8, MODE_FLAG_565, 255, 3 }, */
|
||||
{ SDL_PIXELFORMAT_XBGR1555, MODE_FLAG_TBGR, 65535, 4 },
|
||||
{ SDL_PIXELFORMAT_XRGB1555, MODE_FLAG_TRGB, 65535, 4 },
|
||||
{ SDL_PIXELFORMAT_ABGR1555, MODE_FLAG_ABGR, 65535, 4 },
|
||||
{ SDL_PIXELFORMAT_ARGB1555, MODE_FLAG_ARGB, 65535, 4 },
|
||||
{ SDL_PIXELFORMAT_XBGR4444, MODE_FLAG_TBGR, 4095, 4 },
|
||||
{ SDL_PIXELFORMAT_XRGB4444, MODE_FLAG_TRGB, 4095, 4 },
|
||||
{ SDL_PIXELFORMAT_ABGR4444, MODE_FLAG_ABGR, 4095, 4 },
|
||||
{ SDL_PIXELFORMAT_ARGB4444, MODE_FLAG_ARGB, 4095, 4 },
|
||||
{ SDL_PIXELFORMAT_BGR565, MODE_FLAG_TBGR | MODE_FLAG_565, 65535, 4 },
|
||||
{ SDL_PIXELFORMAT_RGB565, MODE_FLAG_TRGB | MODE_FLAG_565, 65535, 4 },
|
||||
{ SDL_PIXELFORMAT_BGR24, MODE_FLAG_TBGR, 16777215, 6 },
|
||||
{ SDL_PIXELFORMAT_RGB24, MODE_FLAG_TRGB, 16777215, 6 },
|
||||
{ SDL_PIXELFORMAT_XBGR8888, MODE_FLAG_TBGR, -1, 5 },
|
||||
{ SDL_PIXELFORMAT_XRGB8888, MODE_FLAG_TRGB, -1, 5 },
|
||||
{ SDL_PIXELFORMAT_ABGR8888, MODE_FLAG_ABGR, -1, 5 },
|
||||
{ SDL_PIXELFORMAT_ARGB8888, MODE_FLAG_ARGB, -1, 5 }
|
||||
};
|
||||
|
||||
static SDL_PixelFormatEnum
|
||||
RISCOS_ModeToPixelFormat(int ncolour, int modeflags, int log2bpp)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < SDL_arraysize(mode_to_pixelformat); i++) {
|
||||
if (log2bpp == mode_to_pixelformat[i].log2bpp &&
|
||||
(ncolour == mode_to_pixelformat[i].ncolour || ncolour == 0) &&
|
||||
(modeflags & (MODE_FLAG_565 | MODE_FLAG_COLOUR_SPACE)) == mode_to_pixelformat[i].modeflags) {
|
||||
return mode_to_pixelformat[i].pixel_format;
|
||||
}
|
||||
}
|
||||
|
||||
return SDL_PIXELFORMAT_UNKNOWN;
|
||||
}
|
||||
|
||||
static size_t
|
||||
measure_mode_block(const int *block)
|
||||
{
|
||||
size_t blockSize = (block[0] == 2) ? 7 : 5;
|
||||
while(block[blockSize] != -1) {
|
||||
blockSize += 2;
|
||||
}
|
||||
blockSize++;
|
||||
|
||||
return blockSize * 4;
|
||||
}
|
||||
|
||||
static int *
|
||||
read_mode_block(int *block, SDL_DisplayMode *mode)
|
||||
{
|
||||
int xres, yres, ncolour, modeflags, log2bpp, rate;
|
||||
int *end;
|
||||
|
||||
xres = block[1];
|
||||
yres = block[2];
|
||||
if ((block[0] & 0xFF) == 1) {
|
||||
log2bpp = block[3];
|
||||
rate = block[4];
|
||||
end = block + 5;
|
||||
ncolour = (1 << (1 << log2bpp)) - 1;
|
||||
modeflags = MODE_FLAG_TBGR;
|
||||
} else if ((block[0] & 0xFF) == 3) {
|
||||
ncolour = block[3];
|
||||
modeflags = block[4];
|
||||
log2bpp = block[5];
|
||||
rate = block[6];
|
||||
end = block + 7;
|
||||
} else {
|
||||
return NULL;
|
||||
}
|
||||
|
||||
mode->w = xres;
|
||||
mode->h = yres;
|
||||
mode->format = RISCOS_ModeToPixelFormat(ncolour, modeflags, log2bpp);
|
||||
mode->refresh_rate = rate;
|
||||
|
||||
return end;
|
||||
}
|
||||
|
||||
static void *
|
||||
copy_memory(const void *src, size_t size, size_t alloc)
|
||||
{
|
||||
void *dst = SDL_malloc(alloc);
|
||||
if (dst) {
|
||||
SDL_memcpy(dst, src, size);
|
||||
}
|
||||
return dst;
|
||||
}
|
||||
|
||||
int
|
||||
RISCOS_InitModes(_THIS)
|
||||
{
|
||||
SDL_DisplayMode mode;
|
||||
int *current_mode;
|
||||
_kernel_swi_regs regs;
|
||||
_kernel_oserror *error;
|
||||
size_t size;
|
||||
|
||||
regs.r[0] = 1;
|
||||
error = _kernel_swi(OS_ScreenMode, ®s, ®s);
|
||||
if (error != NULL) {
|
||||
return SDL_SetError("Unable to retrieve the current screen mode: %s (%i)", error->errmess, error->errnum);
|
||||
}
|
||||
|
||||
current_mode = (int *)regs.r[1];
|
||||
if (!read_mode_block(current_mode, &mode)) {
|
||||
return SDL_SetError("Unsupported mode block format %d", current_mode[0]);
|
||||
}
|
||||
|
||||
size = measure_mode_block(current_mode);
|
||||
mode.driverdata = copy_memory(current_mode, size, size);
|
||||
if (!mode.driverdata) {
|
||||
return SDL_OutOfMemory();
|
||||
}
|
||||
|
||||
return SDL_AddBasicVideoDisplay(&mode);
|
||||
}
|
||||
|
||||
void
|
||||
RISCOS_GetDisplayModes(_THIS, SDL_VideoDisplay * display)
|
||||
{
|
||||
SDL_DisplayMode mode;
|
||||
_kernel_swi_regs regs;
|
||||
_kernel_oserror *error;
|
||||
void *block, *pos;
|
||||
|
||||
regs.r[0] = 2;
|
||||
regs.r[2] = 0;
|
||||
regs.r[6] = 0;
|
||||
regs.r[7] = 0;
|
||||
error = _kernel_swi(OS_ScreenMode, ®s, ®s);
|
||||
if (error != NULL) {
|
||||
SDL_SetError("Unable to enumerate screen modes: %s (%i)", error->errmess, error->errnum);
|
||||
return;
|
||||
}
|
||||
|
||||
block = SDL_malloc(-regs.r[7]);
|
||||
if (!block) {
|
||||
SDL_OutOfMemory();
|
||||
return;
|
||||
}
|
||||
|
||||
regs.r[6] = (int)block;
|
||||
regs.r[7] = -regs.r[7];
|
||||
error = _kernel_swi(OS_ScreenMode, ®s, ®s);
|
||||
if (error != NULL) {
|
||||
SDL_free(block);
|
||||
SDL_SetError("Unable to enumerate screen modes: %s (%i)", error->errmess, error->errnum);
|
||||
return;
|
||||
}
|
||||
|
||||
for (pos = block; pos < (void *)regs.r[6]; pos += *((int *)pos)) {
|
||||
size_t size;
|
||||
void *end;
|
||||
|
||||
end = read_mode_block(pos + 4, &mode);
|
||||
if (!end) {
|
||||
continue;
|
||||
}
|
||||
|
||||
if (mode.format == SDL_PIXELFORMAT_UNKNOWN)
|
||||
continue;
|
||||
|
||||
size = (end - pos) - 4;
|
||||
mode.driverdata = copy_memory(pos + 4, size, size + 4);
|
||||
if (!mode.driverdata) {
|
||||
SDL_OutOfMemory();
|
||||
break;
|
||||
}
|
||||
*((int *)(mode.driverdata + size)) = -1;
|
||||
|
||||
if (!SDL_AddDisplayMode(display, &mode)) {
|
||||
SDL_free(mode.driverdata);
|
||||
}
|
||||
}
|
||||
|
||||
SDL_free(block);
|
||||
}
|
||||
|
||||
int
|
||||
RISCOS_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode)
|
||||
{
|
||||
const char disable_cursor[] = { 23, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
|
||||
_kernel_swi_regs regs;
|
||||
_kernel_oserror *error;
|
||||
int i;
|
||||
|
||||
regs.r[0] = 0;
|
||||
regs.r[1] = (int)mode->driverdata;
|
||||
error = _kernel_swi(OS_ScreenMode, ®s, ®s);
|
||||
if (error != NULL) {
|
||||
return SDL_SetError("Unable to set the current screen mode: %s (%i)", error->errmess, error->errnum);
|
||||
}
|
||||
|
||||
/* Turn the text cursor off */
|
||||
for (i = 0; i < SDL_arraysize(disable_cursor); i++) {
|
||||
_kernel_oswrch(disable_cursor[i]);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#endif /* SDL_VIDEO_DRIVER_RISCOS */
|
||||
|
||||
/* vi: set ts=4 sw=4 expandtab: */
|
||||
Reference in New Issue
Block a user