Public_Skunkworks/joeylib
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Window scaling fixed in SDL 1.2 backend.

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This commit is contained in:
Scott Duensing 2022-10-12 16:31:24 -05:00
parent 19854fef80
commit fe87646e62
1 changed files with 79 additions and 34 deletions
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113
joeylib/src/jSDL12.c
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@ -93,7 +93,7 @@ static jbool _jlModPlaying = jfalse;
static jlPlatformModT *_jlModCurrent = NULL;
static jbyte _jlModVolume = 255;
static jlSoundPlayingT *_jlSoundList = NULL;
static jint16 _jlWindowZoom = 2;
static jint16 _jlWindowZoom = 3;
static Uint32 _jlUtilTimer(Uint32 interval, void *param);
@ -103,10 +103,10 @@ static void _jlAudioCallback(void *userdata, Uint8 *buffer, int bytes);
extern jbool _jlSwapChannels;
/*
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wcast-align"
/*
Uint32 _jlGetPixel(SDL_Surface *surface, int x, int y) {
int bpp = surface->format->BytesPerPixel;
@ -138,6 +138,7 @@ Uint32 _jlGetPixel(SDL_Surface *surface, int x, int y) {
return 0;
}
}
*/
void _jlPutPixel(SDL_Surface *surface, int x, int y, Uint32 pixel) {
@ -173,7 +174,6 @@ void _jlPutPixel(SDL_Surface *surface, int x, int y, Uint32 pixel) {
}
#pragma GCC diagnostic pop
*/
static void _jlAudioCallback(void *userdata, Uint8 *buffer, int bytes) {
@ -257,44 +257,89 @@ static void _jlAudioCallback(void *userdata, Uint8 *buffer, int bytes) {
void jlDisplayPresent(void) {
int i = 0;
int j = 0;
Uint16 *pixels = NULL;
SDL_Rect r;
jlUtilIdle();
// Render 4 bit copy to proper pixel format.
// This extra step preserves palette effects.
SDL_LockSurface(_jlTexture);
pixels = (Uint16 *)_jlTexture->pixels;
for (int y=0; y<200; y++) {
for (int x=0; x<160; x++) {
// We decode this R/L instead of L/R for some reason. NO idea why yet. Endians?
pixels[i++] = SDL_MapRGBA(_jlTexture->format,
_jlBackingStore->palette[_jlBackingStore->pixels[j].r].r * 16,
_jlBackingStore->palette[_jlBackingStore->pixels[j].r].g * 16,
_jlBackingStore->palette[_jlBackingStore->pixels[j].r].b * 16,
255);
pixels[i++] = SDL_MapRGBA(_jlTexture->format,
_jlBackingStore->palette[_jlBackingStore->pixels[j].l].r * 16,
_jlBackingStore->palette[_jlBackingStore->pixels[j].l].g * 16,
_jlBackingStore->palette[_jlBackingStore->pixels[j].l].b * 16,
255);
j++;
}
}
SDL_UnlockSurface(_jlTexture);
jint16 sourceX;
jint16 sourceY;
jint16 targetX;
jint16 targetY;
juint16 pixelLeft;
juint16 pixelRight;
juint16 p = 0;
SDL_LockSurface(_jlWindow);
// Border.
SDL_FillRect(_jlWindow, NULL, SDL_MapRGB(_jlWindow->format, _jlBorderRGBs[_jlBorderColor][0], _jlBorderRGBs[_jlBorderColor][1], _jlBorderRGBs[_jlBorderColor][2]));
// Display.
r.x = _jlWindowZoom * BORDER_WIDTH;
r.y = _jlWindowZoom * BORDER_WIDTH;
r.w = 320 * _jlWindowZoom;
r.h = 200 * _jlWindowZoom;
SDL_BlitSurface(_jlTexture, NULL, _jlWindow, &r);
// Render 4 bit copy to proper pixel format.
// This extra step preserves palette effects.
targetY = _jlWindowZoom * BORDER_WIDTH;
for (sourceY = 0; sourceY < 200; sourceY++) {
targetX = _jlWindowZoom * BORDER_WIDTH;
for (sourceX = 0; sourceX < 160; sourceX++) {
// We decode this R/L instead of L/R for some reason. NO idea why yet. Endians?
pixelLeft = SDL_MapRGBA(_jlWindow->format,
_jlBackingStore->palette[_jlBackingStore->pixels[p].r].r * 16,
_jlBackingStore->palette[_jlBackingStore->pixels[p].r].g * 16,
_jlBackingStore->palette[_jlBackingStore->pixels[p].r].b * 16,
255);
pixelRight = SDL_MapRGBA(_jlWindow->format,
_jlBackingStore->palette[_jlBackingStore->pixels[p].l].r * 16,
_jlBackingStore->palette[_jlBackingStore->pixels[p].l].g * 16,
_jlBackingStore->palette[_jlBackingStore->pixels[p].l].b * 16,
255);
// Copy to display. SDL 1.2 does not scale surfaces, so we have to do it manually.
switch (_jlWindowZoom) {
case 1:
_jlPutPixel(_jlWindow, targetX, targetY, pixelLeft);
_jlPutPixel(_jlWindow, targetX + 1, targetY, pixelRight);
break;
case 2:
_jlPutPixel(_jlWindow, targetX, targetY, pixelLeft);
_jlPutPixel(_jlWindow, targetX + 1, targetY, pixelLeft);
_jlPutPixel(_jlWindow, targetX, targetY + 1, pixelLeft);
_jlPutPixel(_jlWindow, targetX + 1, targetY + 1, pixelLeft);
_jlPutPixel(_jlWindow, targetX + 2, targetY, pixelRight);
_jlPutPixel(_jlWindow, targetX + 3, targetY, pixelRight);
_jlPutPixel(_jlWindow, targetX + 2, targetY + 1, pixelRight);
_jlPutPixel(_jlWindow, targetX + 3, targetY + 1, pixelRight);
break;
case 3:
// There is no way this is efficient.
_jlPutPixel(_jlWindow, targetX, targetY, pixelLeft);
_jlPutPixel(_jlWindow, targetX + 1, targetY, pixelLeft);
_jlPutPixel(_jlWindow, targetX + 2, targetY, pixelLeft);
_jlPutPixel(_jlWindow, targetX, targetY + 1, pixelLeft);
_jlPutPixel(_jlWindow, targetX + 1, targetY + 1, pixelLeft);
_jlPutPixel(_jlWindow, targetX + 2, targetY + 1, pixelLeft);
_jlPutPixel(_jlWindow, targetX, targetY + 2, pixelLeft);
_jlPutPixel(_jlWindow, targetX + 1, targetY + 2, pixelLeft);
_jlPutPixel(_jlWindow, targetX + 2, targetY + 2, pixelLeft);
_jlPutPixel(_jlWindow, targetX + 3, targetY, pixelRight);
_jlPutPixel(_jlWindow, targetX + 4, targetY, pixelRight);
_jlPutPixel(_jlWindow, targetX + 5, targetY, pixelRight);
_jlPutPixel(_jlWindow, targetX + 3, targetY + 1, pixelRight);
_jlPutPixel(_jlWindow, targetX + 4, targetY + 1, pixelRight);
_jlPutPixel(_jlWindow, targetX + 5, targetY + 1, pixelRight);
_jlPutPixel(_jlWindow, targetX + 3, targetY + 2, pixelRight);
_jlPutPixel(_jlWindow, targetX + 4, targetY + 2, pixelRight);
_jlPutPixel(_jlWindow, targetX + 5, targetY + 2, pixelRight);
break;
}
// Increment pixel locations.
p++;
targetX += _jlWindowZoom + _jlWindowZoom;
}
targetY += _jlWindowZoom;
}
SDL_UnlockSurface(_jlWindow);
SDL_Flip(_jlWindow);
}