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riscos: Fix detection of the current mode

This commit is contained in:
Cameron Cawley 2021-10-25 22:55:02 +01:00 committed by Sam Lantinga
parent 53b3db0c5d
commit 5a3c97f3a3
1 changed files with 26 additions and 5 deletions
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31
src/video/riscos/SDL_riscosmodes.c
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@ -95,21 +95,33 @@ measure_mode_block(const int *block)
return blockSize * 4;
}
static int
read_mode_variable(int *block, int var)
{
_kernel_swi_regs regs;
regs.r[0] = (int)block;
regs.r[1] = var;
_kernel_swi(OS_ReadModeVariable, &regs, &regs);
return regs.r[2];
}
static int *
read_mode_block(int *block, SDL_DisplayMode *mode)
read_mode_block(int *block, SDL_DisplayMode *mode, SDL_bool extended)
{
int xres, yres, ncolour, modeflags, log2bpp, rate;
int *end;
xres = block[1];
yres = block[2];
if ((block[0] & 0xFF) == 1) {
xres = block[1];
yres = block[2];
log2bpp = block[3];
rate = block[4];
end = block + 5;
ncolour = (1 << (1 << log2bpp)) - 1;
modeflags = MODE_FLAG_TBGR;
} else if ((block[0] & 0xFF) == 3) {
xres = block[1];
yres = block[2];
ncolour = block[3];
modeflags = block[4];
log2bpp = block[5];
@ -119,6 +131,15 @@ read_mode_block(int *block, SDL_DisplayMode *mode)
return NULL;
}
if (extended) {
xres = read_mode_variable(block, 11) + 1;
yres = read_mode_variable(block, 12) + 1;
log2bpp = read_mode_variable(block, 9);
end = block + (measure_mode_block(block) / 4);
ncolour = read_mode_variable(block, 3);
modeflags = read_mode_variable(block, 0);
}
mode->w = xres;
mode->h = yres;
mode->format = RISCOS_ModeToPixelFormat(ncolour, modeflags, log2bpp);
@ -153,7 +174,7 @@ RISCOS_InitModes(_THIS)
}
current_mode = (int *)regs.r[1];
if (!read_mode_block(current_mode, &mode)) {
if (!read_mode_block(current_mode, &mode, SDL_TRUE)) {
return SDL_SetError("Unsupported mode block format %d", current_mode[0]);
}
@ -203,7 +224,7 @@ RISCOS_GetDisplayModes(_THIS, SDL_VideoDisplay * display)
size_t size;
void *end;
end = read_mode_block(pos + 4, &mode);
end = read_mode_block(pos + 4, &mode, SDL_FALSE);
if (!end) {
continue;
}