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examples/renderer/20-blending: Note when a blend mode is unsupported.

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Ryan C. Gordon
2026-05-22 10:35:41 -04:00
parent 39be8a703f
commit 9fe200c215
1 changed files with 13 additions and 2 deletions
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15
examples/renderer/20-blending/blending.c
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@@ -211,14 +211,25 @@ SDL_AppResult SDL_AppIterate(void *appstate)
SDL_FRect blue_dst = { panels[i].x + BLUE_OFFSET, panels[i].y + BLUE_OFFSET, RECT_SIZE, RECT_SIZE };
/* Apply the current blend mode */
SDL_SetTextureBlendMode(red_rect_texture, blend_modes[i]);
const bool supported = SDL_SetTextureBlendMode(red_rect_texture, blend_modes[i]); /* just make sure the renderer supports this blend mode */
SDL_SetTextureBlendMode(green_rect_texture, blend_modes[i]);
SDL_SetTextureBlendMode(blue_rect_texture, blend_modes[i]);
SDL_SetTextureBlendMode(blue_rect_texture, blend_modes[i]);
/* Render textures */
SDL_RenderTexture(renderer, red_rect_texture, NULL, &red_dst);
SDL_RenderTexture(renderer, green_rect_texture, NULL, &green_dst);
SDL_RenderTexture(renderer, blue_rect_texture, NULL, &blue_dst);
/* Not all renderers support all blend modes. The renderer will try to pick something close in this case,
but it should be noted that the results might be unexpected, so we add "[UNSUPPORTED]" to this panel. */
if (!supported) {
const float textwidth = 104.0f;
const SDL_FRect dst = { panels[i].x + ((panels[i].w - textwidth) / 2.0f), panels[i].y + (panels[i].h - 8), textwidth, 8 };
SDL_SetRenderDrawColor(renderer, 0, 0, 0, SDL_ALPHA_OPAQUE);
SDL_RenderFillRect(renderer, &dst);
SDL_SetRenderDrawColor(renderer, 255, 255, 255, SDL_ALPHA_OPAQUE);
SDL_RenderDebugText(renderer, dst.x, dst.y, "[UNSUPPORTED]");
}
}
SDL_RenderPresent(renderer);