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[Renderers/SDL3] Use text engine to render text on the SDL3 renderer (#256)

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Julio Ernesto Rodríguez Cabañas 2025-02-12 20:19:36 +00:00 • committed by GitHub
parent 6d23a35d15
commit eeb4520f48
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GPG key ID: B5690EEEBB952194
2 changed files with 71 additions and 44 deletions
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54
examples/SDL3-simple-demo/main.c
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@ -19,13 +19,14 @@ static const Clay_Color COLOR_LIGHT = (Clay_Color) {224, 215, 210, 255};
typedef struct app_state {
SDL_Window *window;
SDL_Renderer *renderer;
Clay_SDL3RendererData rendererData;
ClayVideoDemo_Data demoData;
} AppState;
static inline Clay_Dimensions SDL_MeasureText(Clay_StringSlice text, Clay_TextElementConfig *config, void *userData)
{
TTF_Font *font = gFonts[config->fontId];
TTF_Font **fonts = userData;
TTF_Font *font = fonts[config->fontId];
int width, height;
if (!TTF_GetStringSize(font, text.chars, text.length, &width, &height)) {
@ -54,19 +55,31 @@ SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[])
}
*appstate = state;
if (!SDL_CreateWindowAndRenderer("Clay Demo", 640, 480, 0, &state->window, &state->renderer)) {
if (!SDL_CreateWindowAndRenderer("Clay Demo", 640, 480, 0, &state->window, &state->rendererData.renderer)) {
SDL_LogError(SDL_LOG_CATEGORY_ERROR, "Failed to create window and renderer: %s", SDL_GetError());
return SDL_APP_FAILURE;
}
SDL_SetWindowResizable(state->window, true);
state->rendererData.textEngine = TTF_CreateRendererTextEngine(state->rendererData.renderer);
if (!state->rendererData.textEngine) {
SDL_LogError(SDL_LOG_CATEGORY_ERROR, "Failed to create text engine from renderer: %s", SDL_GetError());
return SDL_APP_FAILURE;
}
state->rendererData.fonts = SDL_calloc(1, sizeof(TTF_Font *));
if (!state->rendererData.fonts) {
SDL_LogError(SDL_LOG_CATEGORY_ERROR, "Failed to allocate memory for the font array: %s", SDL_GetError());
return SDL_APP_FAILURE;
}
TTF_Font *font = TTF_OpenFont("resources/Roboto-Regular.ttf", 24);
if (!font) {
SDL_LogError(SDL_LOG_CATEGORY_ERROR, "Failed to load font: %s", SDL_GetError());
return SDL_APP_FAILURE;
}
gFonts[FONT_ID] = font;
state->rendererData.fonts[FONT_ID] = font;
/* Initialize Clay */
uint64_t totalMemorySize = Clay_MinMemorySize();
@ -78,7 +91,7 @@ SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[])
int width, height;
SDL_GetWindowSize(state->window, &width, &height);
Clay_Initialize(clayMemory, (Clay_Dimensions) { (float) width, (float) height }, (Clay_ErrorHandler) { HandleClayErrors });
Clay_SetMeasureTextFunction(SDL_MeasureText, 0);
Clay_SetMeasureTextFunction(SDL_MeasureText, state->rendererData.fonts);
state->demoData = ClayVideoDemo_Initialize();
@ -99,10 +112,14 @@ SDL_AppResult SDL_AppEvent(void *appstate, SDL_Event *event)
break;
case SDL_EVENT_MOUSE_MOTION:
Clay_SetPointerState((Clay_Vector2) { event->motion.x, event->motion.y },
event->motion.state & SDL_BUTTON_LEFT);
event->motion.state & SDL_BUTTON_LMASK);
break;
case SDL_EVENT_MOUSE_BUTTON_DOWN:
Clay_SetPointerState((Clay_Vector2) { event->button.x, event->button.y },
event->button.button == SDL_BUTTON_LEFT);
break;
case SDL_EVENT_MOUSE_WHEEL:
Clay_UpdateScrollContainers(true, (Clay_Vector2) { event->motion.xrel, event->motion.yrel }, 0.01f);
Clay_UpdateScrollContainers(true, (Clay_Vector2) { event->wheel.x, event->wheel.y }, 0.01f);
break;
default:
break;
@ -117,12 +134,12 @@ SDL_AppResult SDL_AppIterate(void *appstate)
Clay_RenderCommandArray render_commands = ClayVideoDemo_CreateLayout(&state->demoData);
SDL_SetRenderDrawColor(state->renderer, 0, 0, 0, 255);
SDL_RenderClear(state->renderer);
SDL_SetRenderDrawColor(state->rendererData.renderer, 0, 0, 0, 255);
SDL_RenderClear(state->rendererData.renderer);
SDL_RenderClayCommands(state->renderer, &render_commands);
SDL_Clay_RenderClayCommands(&state->rendererData, &render_commands);
SDL_RenderPresent(state->renderer);
SDL_RenderPresent(state->rendererData.renderer);
return SDL_APP_CONTINUE;
}
@ -138,12 +155,23 @@ void SDL_AppQuit(void *appstate, SDL_AppResult result)
AppState *state = appstate;
if (state) {
if (state->renderer)
SDL_DestroyRenderer(state->renderer);
if (state->rendererData.renderer)
SDL_DestroyRenderer(state->rendererData.renderer);
if (state->window)
SDL_DestroyWindow(state->window);
if (state->rendererData.fonts) {
for(size_t i = 0; i < sizeof(state->rendererData.fonts) / sizeof(*state->rendererData.fonts); i++) {
TTF_CloseFont(state->rendererData.fonts[i]);
}
SDL_free(state->rendererData.fonts);
}
if (state->rendererData.textEngine)
TTF_DestroyRendererTextEngine(state->rendererData.textEngine);
SDL_free(state);
}
TTF_Quit();