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Use texture palettes for the BytePusher example

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This commit is contained in:
Cameron Cawley
2025-10-06 17:10:03 +01:00
committed by Sam Lantinga
parent b92557c0b7
commit 2f9f939446
1 changed files with 15 additions and 35 deletions
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examples/demo/04-bytepusher/bytepusher.c
+15 -35
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@@ -31,8 +31,8 @@ typedef struct {
Uint64 tick_acc; Uint64 tick_acc;
SDL_Window* window; SDL_Window* window;
SDL_Renderer* renderer; SDL_Renderer* renderer;
SDL_Surface* screen; SDL_Palette* palette;
SDL_Texture* screentex; SDL_Texture* texture;
SDL_Texture* rendertarget; /* we need this render target for text to look good */ SDL_Texture* rendertarget; /* we need this render target for text to look good */
SDL_AudioStream* audiostream; SDL_AudioStream* audiostream;
char status[SCREEN_W / 8]; char status[SCREEN_W / 8];
@@ -130,11 +130,9 @@ static void print(BytePusher* vm, int x, int y, const char* str) {
SDL_AppResult SDL_AppInit(void** appstate, int argc, char* argv[]) { SDL_AppResult SDL_AppInit(void** appstate, int argc, char* argv[]) {
BytePusher* vm; BytePusher* vm;
SDL_Palette* palette;
SDL_Rect usable_bounds; SDL_Rect usable_bounds;
SDL_AudioSpec audiospec = { SDL_AUDIO_S8, 1, SAMPLES_PER_FRAME * FRAMES_PER_SECOND }; SDL_AudioSpec audiospec = { SDL_AUDIO_S8, 1, SAMPLES_PER_FRAME * FRAMES_PER_SECOND };
SDL_DisplayID primary_display; SDL_DisplayID primary_display;
SDL_PropertiesID texprops;
int zoom = 2; int zoom = 2;
int i; int i;
Uint8 r, g, b; Uint8 r, g, b;
@@ -185,13 +183,7 @@ SDL_AppResult SDL_AppInit(void** appstate, int argc, char* argv[]) {
return SDL_APP_FAILURE; return SDL_APP_FAILURE;
} }
if (!(vm->screen = SDL_CreateSurfaceFrom( if (!(vm->palette = SDL_CreatePalette(256))) {
SCREEN_W, SCREEN_H, SDL_PIXELFORMAT_INDEX8, vm->ram, SCREEN_W
))) {
return SDL_APP_FAILURE;
}
if (!(palette = SDL_CreateSurfacePalette(vm->screen))) {
return SDL_APP_FAILURE; return SDL_APP_FAILURE;
} }
i = 0; i = 0;
@@ -199,27 +191,22 @@ SDL_AppResult SDL_AppInit(void** appstate, int argc, char* argv[]) {
for (g = 0; g < 6; ++g) { for (g = 0; g < 6; ++g) {
for (b = 0; b < 6; ++b, ++i) { for (b = 0; b < 6; ++b, ++i) {
SDL_Color color = { (Uint8)(r * 0x33), (Uint8)(g * 0x33), (Uint8)(b * 0x33), SDL_ALPHA_OPAQUE }; SDL_Color color = { (Uint8)(r * 0x33), (Uint8)(g * 0x33), (Uint8)(b * 0x33), SDL_ALPHA_OPAQUE };
palette->colors[i] = color; vm->palette->colors[i] = color;
} }
} }
} }
for (; i < 256; ++i) { for (; i < 256; ++i) {
SDL_Color color = { 0, 0, 0, SDL_ALPHA_OPAQUE }; SDL_Color color = { 0, 0, 0, SDL_ALPHA_OPAQUE };
palette->colors[i] = color; vm->palette->colors[i] = color;
} }
texprops = SDL_CreateProperties(); vm->texture = SDL_CreateTexture(vm->renderer, SDL_PIXELFORMAT_INDEX8, SDL_TEXTUREACCESS_STREAMING, SCREEN_W, SCREEN_H);
SDL_SetNumberProperty(texprops, SDL_PROP_TEXTURE_CREATE_ACCESS_NUMBER, SDL_TEXTUREACCESS_STREAMING); vm->rendertarget = SDL_CreateTexture(vm->renderer, SDL_PIXELFORMAT_UNKNOWN, SDL_TEXTUREACCESS_TARGET, SCREEN_W, SCREEN_H);
SDL_SetNumberProperty(texprops, SDL_PROP_TEXTURE_CREATE_WIDTH_NUMBER, SCREEN_W); if (!vm->texture || !vm->rendertarget) {
SDL_SetNumberProperty(texprops, SDL_PROP_TEXTURE_CREATE_HEIGHT_NUMBER, SCREEN_H);
vm->screentex = SDL_CreateTextureWithProperties(vm->renderer, texprops);
SDL_SetNumberProperty(texprops, SDL_PROP_TEXTURE_CREATE_ACCESS_NUMBER, SDL_TEXTUREACCESS_TARGET);
vm->rendertarget = SDL_CreateTextureWithProperties(vm->renderer, texprops);
SDL_DestroyProperties(texprops);
if (!vm->screentex || !vm->rendertarget) {
return SDL_APP_FAILURE; return SDL_APP_FAILURE;
} }
SDL_SetTextureScaleMode(vm->screentex, SDL_SCALEMODE_NEAREST); SDL_SetTexturePalette(vm->texture, vm->palette);
SDL_SetTextureScaleMode(vm->texture, SDL_SCALEMODE_NEAREST);
SDL_SetTextureScaleMode(vm->rendertarget, SDL_SCALEMODE_NEAREST); SDL_SetTextureScaleMode(vm->rendertarget, SDL_SCALEMODE_NEAREST);
if (!(vm->audiostream = SDL_OpenAudioDeviceStream( if (!(vm->audiostream = SDL_OpenAudioDeviceStream(
@@ -283,18 +270,11 @@ SDL_AppResult SDL_AppIterate(void* appstate) {
} }
if (updated) { if (updated) {
SDL_Surface *tex; const void *pixels = &vm->ram[(Uint32)vm->ram[IO_SCREEN_PAGE] << 16];
SDL_UpdateTexture(vm->texture, NULL, pixels, SCREEN_W);
SDL_SetRenderTarget(vm->renderer, vm->rendertarget); SDL_SetRenderTarget(vm->renderer, vm->rendertarget);
SDL_RenderTexture(vm->renderer, vm->texture, NULL, NULL);
if (!SDL_LockTextureToSurface(vm->screentex, NULL, &tex)) {
return SDL_APP_FAILURE;
}
vm->screen->pixels = &vm->ram[(Uint32)vm->ram[IO_SCREEN_PAGE] << 16];
SDL_BlitSurface(vm->screen, NULL, tex, NULL);
SDL_UnlockTexture(vm->screentex);
SDL_RenderTexture(vm->renderer, vm->screentex, NULL, NULL);
if (vm->display_help) { if (vm->display_help) {
print(vm, 4, 4, "Drop a BytePusher file in this"); print(vm, 4, 4, "Drop a BytePusher file in this");
@@ -406,8 +386,8 @@ void SDL_AppQuit(void* appstate, SDL_AppResult result) {
BytePusher* vm = (BytePusher*)appstate; BytePusher* vm = (BytePusher*)appstate;
SDL_DestroyAudioStream(vm->audiostream); SDL_DestroyAudioStream(vm->audiostream);
SDL_DestroyTexture(vm->rendertarget); SDL_DestroyTexture(vm->rendertarget);
SDL_DestroyTexture(vm->screentex); SDL_DestroyTexture(vm->texture);
SDL_DestroySurface(vm->screen); SDL_DestroyPalette(vm->palette);
SDL_DestroyRenderer(vm->renderer); SDL_DestroyRenderer(vm->renderer);
SDL_DestroyWindow(vm->window); SDL_DestroyWindow(vm->window);
SDL_free(vm); SDL_free(vm);