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SDL/test/testpalette.c

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/*
Copyright (C) 1997-2025 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.
*/
/* Simple program: Move N sprites around on the screen as fast as possible */
#include <SDL3/SDL.h>
#include <SDL3/SDL_test_memory.h>
#include <SDL3/SDL_main.h>
#ifdef SDL_PLATFORM_EMSCRIPTEN
#include <emscripten/emscripten.h>
#endif
#define WINDOW_WIDTH 640
#define WINDOW_HEIGHT 480
static const SDL_Color Palette[256] = {
{ 255, 0, 0, SDL_ALPHA_OPAQUE },
{ 255, 5, 0, SDL_ALPHA_OPAQUE },
{ 255, 11, 0, SDL_ALPHA_OPAQUE },
{ 255, 17, 0, SDL_ALPHA_OPAQUE },
{ 255, 23, 0, SDL_ALPHA_OPAQUE },
{ 255, 29, 0, SDL_ALPHA_OPAQUE },
{ 255, 35, 0, SDL_ALPHA_OPAQUE },
{ 255, 41, 0, SDL_ALPHA_OPAQUE },
{ 255, 47, 0, SDL_ALPHA_OPAQUE },
{ 255, 53, 0, SDL_ALPHA_OPAQUE },
{ 255, 59, 0, SDL_ALPHA_OPAQUE },
{ 255, 65, 0, SDL_ALPHA_OPAQUE },
{ 255, 71, 0, SDL_ALPHA_OPAQUE },
{ 255, 77, 0, SDL_ALPHA_OPAQUE },
{ 255, 83, 0, SDL_ALPHA_OPAQUE },
{ 255, 89, 0, SDL_ALPHA_OPAQUE },
{ 255, 95, 0, SDL_ALPHA_OPAQUE },
{ 255, 101, 0, SDL_ALPHA_OPAQUE },
{ 255, 107, 0, SDL_ALPHA_OPAQUE },
{ 255, 113, 0, SDL_ALPHA_OPAQUE },
{ 255, 119, 0, SDL_ALPHA_OPAQUE },
{ 255, 125, 0, SDL_ALPHA_OPAQUE },
{ 255, 131, 0, SDL_ALPHA_OPAQUE },
{ 255, 137, 0, SDL_ALPHA_OPAQUE },
{ 255, 143, 0, SDL_ALPHA_OPAQUE },
{ 255, 149, 0, SDL_ALPHA_OPAQUE },
{ 255, 155, 0, SDL_ALPHA_OPAQUE },
{ 255, 161, 0, SDL_ALPHA_OPAQUE },
{ 255, 167, 0, SDL_ALPHA_OPAQUE },
{ 255, 173, 0, SDL_ALPHA_OPAQUE },
{ 255, 179, 0, SDL_ALPHA_OPAQUE },
{ 255, 185, 0, SDL_ALPHA_OPAQUE },
{ 255, 191, 0, SDL_ALPHA_OPAQUE },
{ 255, 197, 0, SDL_ALPHA_OPAQUE },
{ 255, 203, 0, SDL_ALPHA_OPAQUE },
{ 255, 209, 0, SDL_ALPHA_OPAQUE },
{ 255, 215, 0, SDL_ALPHA_OPAQUE },
{ 255, 221, 0, SDL_ALPHA_OPAQUE },
{ 255, 227, 0, SDL_ALPHA_OPAQUE },
{ 255, 233, 0, SDL_ALPHA_OPAQUE },
{ 255, 239, 0, SDL_ALPHA_OPAQUE },
{ 255, 245, 0, SDL_ALPHA_OPAQUE },
{ 255, 251, 0, SDL_ALPHA_OPAQUE },
{ 253, 255, 0, SDL_ALPHA_OPAQUE },
{ 247, 255, 0, SDL_ALPHA_OPAQUE },
{ 241, 255, 0, SDL_ALPHA_OPAQUE },
{ 235, 255, 0, SDL_ALPHA_OPAQUE },
{ 229, 255, 0, SDL_ALPHA_OPAQUE },
{ 223, 255, 0, SDL_ALPHA_OPAQUE },
{ 217, 255, 0, SDL_ALPHA_OPAQUE },
{ 211, 255, 0, SDL_ALPHA_OPAQUE },
{ 205, 255, 0, SDL_ALPHA_OPAQUE },
{ 199, 255, 0, SDL_ALPHA_OPAQUE },
{ 193, 255, 0, SDL_ALPHA_OPAQUE },
{ 187, 255, 0, SDL_ALPHA_OPAQUE },
{ 181, 255, 0, SDL_ALPHA_OPAQUE },
{ 175, 255, 0, SDL_ALPHA_OPAQUE },
{ 169, 255, 0, SDL_ALPHA_OPAQUE },
{ 163, 255, 0, SDL_ALPHA_OPAQUE },
{ 157, 255, 0, SDL_ALPHA_OPAQUE },
{ 151, 255, 0, SDL_ALPHA_OPAQUE },
{ 145, 255, 0, SDL_ALPHA_OPAQUE },
{ 139, 255, 0, SDL_ALPHA_OPAQUE },
{ 133, 255, 0, SDL_ALPHA_OPAQUE },
{ 127, 255, 0, SDL_ALPHA_OPAQUE },
{ 121, 255, 0, SDL_ALPHA_OPAQUE },
{ 115, 255, 0, SDL_ALPHA_OPAQUE },
{ 109, 255, 0, SDL_ALPHA_OPAQUE },
{ 103, 255, 0, SDL_ALPHA_OPAQUE },
{ 97, 255, 0, SDL_ALPHA_OPAQUE },
{ 91, 255, 0, SDL_ALPHA_OPAQUE },
{ 85, 255, 0, SDL_ALPHA_OPAQUE },
{ 79, 255, 0, SDL_ALPHA_OPAQUE },
{ 73, 255, 0, SDL_ALPHA_OPAQUE },
{ 67, 255, 0, SDL_ALPHA_OPAQUE },
{ 61, 255, 0, SDL_ALPHA_OPAQUE },
{ 55, 255, 0, SDL_ALPHA_OPAQUE },
{ 49, 255, 0, SDL_ALPHA_OPAQUE },
{ 43, 255, 0, SDL_ALPHA_OPAQUE },
{ 37, 255, 0, SDL_ALPHA_OPAQUE },
{ 31, 255, 0, SDL_ALPHA_OPAQUE },
{ 25, 255, 0, SDL_ALPHA_OPAQUE },
{ 19, 255, 0, SDL_ALPHA_OPAQUE },
{ 13, 255, 0, SDL_ALPHA_OPAQUE },
{ 7, 255, 0, SDL_ALPHA_OPAQUE },
{ 1, 255, 0, SDL_ALPHA_OPAQUE },
{ 0, 255, 3, SDL_ALPHA_OPAQUE },
{ 0, 255, 9, SDL_ALPHA_OPAQUE },
{ 0, 255, 15, SDL_ALPHA_OPAQUE },
{ 0, 255, 21, SDL_ALPHA_OPAQUE },
{ 0, 255, 27, SDL_ALPHA_OPAQUE },
{ 0, 255, 33, SDL_ALPHA_OPAQUE },
{ 0, 255, 39, SDL_ALPHA_OPAQUE },
{ 0, 255, 45, SDL_ALPHA_OPAQUE },
{ 0, 255, 51, SDL_ALPHA_OPAQUE },
{ 0, 255, 57, SDL_ALPHA_OPAQUE },
{ 0, 255, 63, SDL_ALPHA_OPAQUE },
{ 0, 255, 69, SDL_ALPHA_OPAQUE },
{ 0, 255, 75, SDL_ALPHA_OPAQUE },
{ 0, 255, 81, SDL_ALPHA_OPAQUE },
{ 0, 255, 87, SDL_ALPHA_OPAQUE },
{ 0, 255, 93, SDL_ALPHA_OPAQUE },
{ 0, 255, 99, SDL_ALPHA_OPAQUE },
{ 0, 255, 105, SDL_ALPHA_OPAQUE },
{ 0, 255, 111, SDL_ALPHA_OPAQUE },
{ 0, 255, 117, SDL_ALPHA_OPAQUE },
{ 0, 255, 123, SDL_ALPHA_OPAQUE },
{ 0, 255, 129, SDL_ALPHA_OPAQUE },
{ 0, 255, 135, SDL_ALPHA_OPAQUE },
{ 0, 255, 141, SDL_ALPHA_OPAQUE },
{ 0, 255, 147, SDL_ALPHA_OPAQUE },
{ 0, 255, 153, SDL_ALPHA_OPAQUE },
{ 0, 255, 159, SDL_ALPHA_OPAQUE },
{ 0, 255, 165, SDL_ALPHA_OPAQUE },
{ 0, 255, 171, SDL_ALPHA_OPAQUE },
{ 0, 255, 177, SDL_ALPHA_OPAQUE },
{ 0, 255, 183, SDL_ALPHA_OPAQUE },
{ 0, 255, 189, SDL_ALPHA_OPAQUE },
{ 0, 255, 195, SDL_ALPHA_OPAQUE },
{ 0, 255, 201, SDL_ALPHA_OPAQUE },
{ 0, 255, 207, SDL_ALPHA_OPAQUE },
{ 0, 255, 213, SDL_ALPHA_OPAQUE },
{ 0, 255, 219, SDL_ALPHA_OPAQUE },
{ 0, 255, 225, SDL_ALPHA_OPAQUE },
{ 0, 255, 231, SDL_ALPHA_OPAQUE },
{ 0, 255, 237, SDL_ALPHA_OPAQUE },
{ 0, 255, 243, SDL_ALPHA_OPAQUE },
{ 0, 255, 249, SDL_ALPHA_OPAQUE },
{ 0, 255, 255, SDL_ALPHA_OPAQUE },
{ 0, 249, 255, SDL_ALPHA_OPAQUE },
{ 0, 243, 255, SDL_ALPHA_OPAQUE },
{ 0, 237, 255, SDL_ALPHA_OPAQUE },
{ 0, 231, 255, SDL_ALPHA_OPAQUE },
{ 0, 225, 255, SDL_ALPHA_OPAQUE },
{ 0, 219, 255, SDL_ALPHA_OPAQUE },
{ 0, 213, 255, SDL_ALPHA_OPAQUE },
{ 0, 207, 255, SDL_ALPHA_OPAQUE },
{ 0, 201, 255, SDL_ALPHA_OPAQUE },
{ 0, 195, 255, SDL_ALPHA_OPAQUE },
{ 0, 189, 255, SDL_ALPHA_OPAQUE },
{ 0, 183, 255, SDL_ALPHA_OPAQUE },
{ 0, 177, 255, SDL_ALPHA_OPAQUE },
{ 0, 171, 255, SDL_ALPHA_OPAQUE },
{ 0, 165, 255, SDL_ALPHA_OPAQUE },
{ 0, 159, 255, SDL_ALPHA_OPAQUE },
{ 0, 153, 255, SDL_ALPHA_OPAQUE },
{ 0, 147, 255, SDL_ALPHA_OPAQUE },
{ 0, 141, 255, SDL_ALPHA_OPAQUE },
{ 0, 135, 255, SDL_ALPHA_OPAQUE },
{ 0, 129, 255, SDL_ALPHA_OPAQUE },
{ 0, 123, 255, SDL_ALPHA_OPAQUE },
{ 0, 117, 255, SDL_ALPHA_OPAQUE },
{ 0, 111, 255, SDL_ALPHA_OPAQUE },
{ 0, 105, 255, SDL_ALPHA_OPAQUE },
{ 0, 99, 255, SDL_ALPHA_OPAQUE },
{ 0, 93, 255, SDL_ALPHA_OPAQUE },
{ 0, 87, 255, SDL_ALPHA_OPAQUE },
{ 0, 81, 255, SDL_ALPHA_OPAQUE },
{ 0, 75, 255, SDL_ALPHA_OPAQUE },
{ 0, 69, 255, SDL_ALPHA_OPAQUE },
{ 0, 63, 255, SDL_ALPHA_OPAQUE },
{ 0, 57, 255, SDL_ALPHA_OPAQUE },
{ 0, 51, 255, SDL_ALPHA_OPAQUE },
{ 0, 45, 255, SDL_ALPHA_OPAQUE },
{ 0, 39, 255, SDL_ALPHA_OPAQUE },
{ 0, 33, 255, SDL_ALPHA_OPAQUE },
{ 0, 27, 255, SDL_ALPHA_OPAQUE },
{ 0, 21, 255, SDL_ALPHA_OPAQUE },
{ 0, 15, 255, SDL_ALPHA_OPAQUE },
{ 0, 9, 255, SDL_ALPHA_OPAQUE },
{ 0, 3, 255, SDL_ALPHA_OPAQUE },
{ 1, 0, 255, SDL_ALPHA_OPAQUE },
{ 7, 0, 255, SDL_ALPHA_OPAQUE },
{ 13, 0, 255, SDL_ALPHA_OPAQUE },
{ 19, 0, 255, SDL_ALPHA_OPAQUE },
{ 25, 0, 255, SDL_ALPHA_OPAQUE },
{ 31, 0, 255, SDL_ALPHA_OPAQUE },
{ 37, 0, 255, SDL_ALPHA_OPAQUE },
{ 43, 0, 255, SDL_ALPHA_OPAQUE },
{ 49, 0, 255, SDL_ALPHA_OPAQUE },
{ 55, 0, 255, SDL_ALPHA_OPAQUE },
{ 61, 0, 255, SDL_ALPHA_OPAQUE },
{ 67, 0, 255, SDL_ALPHA_OPAQUE },
{ 73, 0, 255, SDL_ALPHA_OPAQUE },
{ 79, 0, 255, SDL_ALPHA_OPAQUE },
{ 85, 0, 255, SDL_ALPHA_OPAQUE },
{ 91, 0, 255, SDL_ALPHA_OPAQUE },
{ 97, 0, 255, SDL_ALPHA_OPAQUE },
{ 103, 0, 255, SDL_ALPHA_OPAQUE },
{ 109, 0, 255, SDL_ALPHA_OPAQUE },
{ 115, 0, 255, SDL_ALPHA_OPAQUE },
{ 121, 0, 255, SDL_ALPHA_OPAQUE },
{ 127, 0, 255, SDL_ALPHA_OPAQUE },
{ 133, 0, 255, SDL_ALPHA_OPAQUE },
{ 139, 0, 255, SDL_ALPHA_OPAQUE },
{ 145, 0, 255, SDL_ALPHA_OPAQUE },
{ 151, 0, 255, SDL_ALPHA_OPAQUE },
{ 157, 0, 255, SDL_ALPHA_OPAQUE },
{ 163, 0, 255, SDL_ALPHA_OPAQUE },
{ 169, 0, 255, SDL_ALPHA_OPAQUE },
{ 175, 0, 255, SDL_ALPHA_OPAQUE },
{ 181, 0, 255, SDL_ALPHA_OPAQUE },
{ 187, 0, 255, SDL_ALPHA_OPAQUE },
{ 193, 0, 255, SDL_ALPHA_OPAQUE },
{ 199, 0, 255, SDL_ALPHA_OPAQUE },
{ 205, 0, 255, SDL_ALPHA_OPAQUE },
{ 211, 0, 255, SDL_ALPHA_OPAQUE },
{ 217, 0, 255, SDL_ALPHA_OPAQUE },
{ 223, 0, 255, SDL_ALPHA_OPAQUE },
{ 229, 0, 255, SDL_ALPHA_OPAQUE },
{ 235, 0, 255, SDL_ALPHA_OPAQUE },
{ 241, 0, 255, SDL_ALPHA_OPAQUE },
{ 247, 0, 255, SDL_ALPHA_OPAQUE },
{ 253, 0, 255, SDL_ALPHA_OPAQUE },
{ 255, 0, 251, SDL_ALPHA_OPAQUE },
{ 255, 0, 245, SDL_ALPHA_OPAQUE },
{ 255, 0, 239, SDL_ALPHA_OPAQUE },
{ 255, 0, 233, SDL_ALPHA_OPAQUE },
{ 255, 0, 227, SDL_ALPHA_OPAQUE },
{ 255, 0, 221, SDL_ALPHA_OPAQUE },
{ 255, 0, 215, SDL_ALPHA_OPAQUE },
{ 255, 0, 209, SDL_ALPHA_OPAQUE },
{ 255, 0, 203, SDL_ALPHA_OPAQUE },
{ 255, 0, 197, SDL_ALPHA_OPAQUE },
{ 255, 0, 191, SDL_ALPHA_OPAQUE },
{ 255, 0, 185, SDL_ALPHA_OPAQUE },
{ 255, 0, 179, SDL_ALPHA_OPAQUE },
{ 255, 0, 173, SDL_ALPHA_OPAQUE },
{ 255, 0, 167, SDL_ALPHA_OPAQUE },
{ 255, 0, 161, SDL_ALPHA_OPAQUE },
{ 255, 0, 155, SDL_ALPHA_OPAQUE },
{ 255, 0, 149, SDL_ALPHA_OPAQUE },
{ 255, 0, 143, SDL_ALPHA_OPAQUE },
{ 255, 0, 137, SDL_ALPHA_OPAQUE },
{ 255, 0, 131, SDL_ALPHA_OPAQUE },
{ 255, 0, 125, SDL_ALPHA_OPAQUE },
{ 255, 0, 119, SDL_ALPHA_OPAQUE },
{ 255, 0, 113, SDL_ALPHA_OPAQUE },
{ 255, 0, 107, SDL_ALPHA_OPAQUE },
{ 255, 0, 101, SDL_ALPHA_OPAQUE },
{ 255, 0, 95, SDL_ALPHA_OPAQUE },
{ 255, 0, 89, SDL_ALPHA_OPAQUE },
{ 255, 0, 83, SDL_ALPHA_OPAQUE },
{ 255, 0, 77, SDL_ALPHA_OPAQUE },
{ 255, 0, 71, SDL_ALPHA_OPAQUE },
{ 255, 0, 65, SDL_ALPHA_OPAQUE },
{ 255, 0, 59, SDL_ALPHA_OPAQUE },
{ 255, 0, 53, SDL_ALPHA_OPAQUE },
{ 255, 0, 47, SDL_ALPHA_OPAQUE },
{ 255, 0, 41, SDL_ALPHA_OPAQUE },
{ 255, 0, 35, SDL_ALPHA_OPAQUE },
{ 255, 0, 29, SDL_ALPHA_OPAQUE },
{ 255, 0, 23, SDL_ALPHA_OPAQUE },
{ 255, 0, 17, SDL_ALPHA_OPAQUE },
{ 255, 0, 11, SDL_ALPHA_OPAQUE },
{ 255, 0, 5, SDL_ALPHA_OPAQUE }
};
static SDL_Renderer *renderer;
static SDL_Palette *palette;
static SDL_Texture *texture;
static SDL_Texture *black_texture1;
static SDL_Texture *black_texture2;
static SDL_Texture *white_texture1;
static SDL_Texture *white_texture2;
static int palettePos = 0;
static int paletteDir = -1;
static bool done;
static SDL_Texture *CreateTexture(const void *pixels, int pitch)
{
SDL_Texture *tex = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_INDEX8, SDL_TEXTUREACCESS_STATIC, 256, 1);
if (!tex) {
return NULL;
}
SDL_UpdateTexture(tex, NULL, pixels, pitch);
SDL_SetTexturePalette(tex, palette);
return tex;
}
static bool CreateTextures()
{
Uint8 data[256];
int i;
palette = SDL_CreatePalette(256);
if (!palette) {
return false;
}
for (i = 0; i < SDL_arraysize(data); i++) {
data[i] = i;
}
texture = CreateTexture(data, SDL_arraysize(data));
if (!texture) {
return false;
}
black_texture1 = CreateTexture(data, SDL_arraysize(data));
if (!black_texture1) {
return false;
}
SDL_SetTextureScaleMode(black_texture1, SDL_SCALEMODE_NEAREST);
black_texture2 = CreateTexture(data, SDL_arraysize(data));
if (!black_texture2) {
return false;
}
SDL_SetTextureScaleMode(black_texture2, SDL_SCALEMODE_NEAREST);
white_texture1 = CreateTexture(data, SDL_arraysize(data));
if (!white_texture1) {
return false;
}
SDL_SetTextureScaleMode(white_texture1, SDL_SCALEMODE_NEAREST);
white_texture2 = CreateTexture(data, SDL_arraysize(data));
if (!white_texture2) {
return false;
}
SDL_SetTextureScaleMode(white_texture2, SDL_SCALEMODE_NEAREST);
return true;
}
static void UpdatePalette(int pos)
{
int paletteSize = (int)SDL_arraysize(Palette);
if (pos == 0) {
SDL_SetPaletteColors(palette, Palette, 0, paletteSize);
} else {
SDL_SetPaletteColors(palette, Palette + pos, 0, paletteSize - pos);
SDL_SetPaletteColors(palette, Palette, paletteSize - pos, pos);
}
}
static void loop(void)
{
SDL_Event event;
SDL_FRect src = { 1.0f, 0.0f, 1.0f, 1.0f };
SDL_FRect dst1 = { 0.0f, 0.0f, 32.0f, 32.0f };
SDL_FRect dst2 = { 0.0f, WINDOW_HEIGHT - 32.0f, 32.0f, 32.0f };
SDL_FRect dst3 = { WINDOW_WIDTH - 32.0f, 0.0f, 32.0f, 32.0f };
SDL_FRect dst4 = { WINDOW_WIDTH - 32.0f, WINDOW_HEIGHT - 32.0f, 32.0f, 32.0f };
SDL_FRect dst5 = { 0.0f, 32.0f + 2.0f, 32.0f, 32.0f };
SDL_FRect dst6 = { WINDOW_WIDTH - 32.0f, 32.0f + 2.0f, 32.0f, 32.0f };
const SDL_Color black = { 0, 0, 0, SDL_ALPHA_OPAQUE };
const SDL_Color white = { 255, 255, 255, SDL_ALPHA_OPAQUE };
const SDL_Color red = { 255, 0, 0, SDL_ALPHA_OPAQUE };
const SDL_Color blue = { 0, 0, 255, SDL_ALPHA_OPAQUE };
/* Check for events */
while (SDL_PollEvent(&event)) {
switch (event.type) {
case SDL_EVENT_KEY_UP:
switch (event.key.key) {
case SDLK_LEFT:
paletteDir = 1;
break;
case SDLK_RIGHT:
paletteDir = -1;
break;
case SDLK_ESCAPE:
done = true;
break;
default:
break;
}
break;
case SDL_EVENT_QUIT:
done = true;
break;
default:
break;
}
}
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0);
SDL_RenderClear(renderer);
/* Draw the rainbow texture */
UpdatePalette(palettePos);
palettePos += paletteDir;
if (palettePos < 0) {
palettePos = SDL_arraysize(Palette) - 1;
} else if (palettePos >= SDL_arraysize(Palette)) {
palettePos = 0;
}
SDL_RenderTexture(renderer, texture, NULL, NULL);
/* Draw one square with black, and one square with white
* This tests changing palette colors within a single frame
*/
SDL_SetPaletteColors(palette, &black, 1, 1);
SDL_SetRenderDrawColor(renderer, black.r, black.g, black.b, black.a);
SDL_RenderDebugText(renderer, dst1.x + 32.0f + 2.0f, dst1.y + 12, "Black");
SDL_RenderTexture(renderer, black_texture1, &src, &dst1);
SDL_RenderDebugText(renderer, dst2.x + 32.0f + 2.0f, dst2.y + 12, "Black");
SDL_RenderTexture(renderer, black_texture2, &src, &dst2);
SDL_SetPaletteColors(palette, &white, 1, 1);
SDL_SetRenderDrawColor(renderer, white.r, white.g, white.b, white.a);
SDL_RenderDebugText(renderer, dst3.x - 40.0f - 2.0f, dst3.y + 12, "White");
SDL_RenderTexture(renderer, white_texture1, &src, &dst3);
SDL_RenderDebugText(renderer, dst4.x - 40.0f - 2.0f, dst4.y + 12, "White");
SDL_RenderTexture(renderer, white_texture2, &src, &dst4);
/* Draw the same textures again with different colors */
SDL_SetPaletteColors(palette, &red, 1, 1);
SDL_SetRenderDrawColor(renderer, red.r, red.g, red.b, red.a);
SDL_RenderDebugText(renderer, dst5.x + 32.0f + 2.0f, dst5.y + 12, "Red");
SDL_RenderTexture(renderer, black_texture1, &src, &dst5);
SDL_SetPaletteColors(palette, &blue, 1, 1);
SDL_SetRenderDrawColor(renderer, blue.r, blue.g, blue.b, blue.a);
SDL_RenderDebugText(renderer, dst6.x - 40.0f - 2.0f, dst6.y + 12, "Blue");
SDL_RenderTexture(renderer, white_texture1, &src, &dst6);
SDL_RenderPresent(renderer);
SDL_Delay(10);
#ifdef SDL_PLATFORM_EMSCRIPTEN
if (done) {
emscripten_cancel_main_loop();
}
#endif
}
int main(int argc, char *argv[])
{
SDL_Window *window = NULL;
int i, return_code = -1;
SDLTest_TrackAllocations();
for (i = 1; i < argc; ++i) {
if (SDL_strcmp(argv[1], "--renderer") == 0 && argv[i + 1]) {
++i;
SDL_SetHint(SDL_HINT_RENDER_DRIVER, argv[i]);
} else {
SDL_Log("Usage: %s [--renderer driver]", argv[0]);
return_code = 1;
goto quit;
}
}
if (!SDL_CreateWindowAndRenderer("testpalette", WINDOW_WIDTH, WINDOW_HEIGHT, SDL_WINDOW_RESIZABLE, &window, &renderer)) {
SDL_Log("SDL_CreateWindowAndRenderer failed: %s", SDL_GetError());
return_code = 2;
goto quit;
}
if (!CreateTextures()) {
SDL_Log("Couldn't create textures: %s", SDL_GetError());
return_code = 3;
goto quit;
}
/* Main render loop */
done = false;
#ifdef SDL_PLATFORM_EMSCRIPTEN
emscripten_set_main_loop(loop, 0, 1);
#else
while (!done) {
loop();
}
#endif
return_code = 0;
quit:
SDL_DestroyPalette(palette);
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
SDL_Quit();
SDLTest_LogAllocations();
return return_code;
}
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