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fading visuals

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blending does not converge to bg color
This commit is contained in:
Jakob Hördt 2024-08-05 00:27:10 +02:00
parent 5c9ab0240b
commit d7c7d773ab
2 changed files with 32 additions and 10 deletions
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42
main.cpp
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@ -103,23 +103,23 @@ int main() try {
// no clue who owns this // no clue who owns this
auto* texture = SDL_CreateTexture( auto* texture = SDL_CreateTexture(
renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_TARGET, width, renderer, SDL_PIXELFORMAT_RGB888, SDL_TEXTUREACCESS_TARGET, width,
height height
); );
sdl_check(SDL_SetRenderTarget(renderer, texture)); sdl_check(SDL_SetRenderTarget(renderer, texture));
sdl_check(SDL_SetRenderDrawColor(renderer, 0xdb, 0xd7, 0xc0, SDL_ALPHA_OPAQUE)); sdl_check(
SDL_SetRenderDrawColor(renderer, 0xff, 0xff, 0xff, SDL_ALPHA_OPAQUE)
);
sdl_check(SDL_RenderClear(renderer)); sdl_check(SDL_RenderClear(renderer));
sdl_check(SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_BLEND));
sdl_check(SDL_SetRenderDrawColor(renderer, 0x00, 0x00, 0x00, 2));
SDL_Point pos{.x = width / 2, .y = height / 2}; SDL_Point pos{.x = width / 2, .y = height / 2};
constexpr SDL_Point directions[] = { constexpr SDL_Point directions[] = {
{.x = -1, .y = 0}, {.x = 1, .y = 0}, {.x = 0, .y = -1}, {.x = 0, .y = 1} {.x = -1, .y = 0}, {.x = 1, .y = 0}, {.x = 0, .y = -1}, {.x = 0, .y = 1}
}; };
std::mt19937_64 rne(std::random_device{}()); std::mt19937_64 rne(std::random_device{}());
std::uniform_int_distribution dist(0, 3); std::uniform_int_distribution dist(0, 3);
constexpr auto batchsize = 1000; constexpr auto batchsize = 10000;
const auto start_time = clock::now(); const auto start_time = clock::now();
auto next_poll_events_time = start_time; auto next_poll_events_time = start_time;
@ -149,13 +149,35 @@ int main() try {
pos = newpoint; pos = newpoint;
point_batch[step] = newpoint; point_batch[step] = newpoint;
} }
sdl_check(SDL_SetRenderTarget(renderer, texture));
sdl_check(SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_BLEND));
sdl_check(SDL_RenderDrawPoints(renderer, point_batch.data(), point_batch.size()));
///// Render image
sdl_check(SDL_SetRenderTarget(renderer, texture));
sdl_check(SDL_SetRenderDrawBlendMode(
renderer,
SDL_ComposeCustomBlendMode(
SDL_BLENDFACTOR_SRC_ALPHA, SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA,
SDL_BLENDOPERATION_ADD, SDL_BLENDFACTOR_ZERO,
SDL_BLENDFACTOR_ONE, SDL_BLENDOPERATION_ADD
)
));
sdl_check(
SDL_SetRenderDrawColor(renderer, 0x00, 0x00, 0x00, SDL_ALPHA_OPAQUE)
);
sdl_check(SDL_RenderDrawPoints(
renderer, point_batch.data(), point_batch.size()
));
sdl_check(SDL_SetRenderDrawColor(renderer, 0xff, 0xff, 0xff, 32));
sdl_check(SDL_RenderFillRect(renderer, nullptr));
// SDL_RenderCopy(renderer, fade_texture, nullptr, nullptr);
///// Render screen
sdl_check(SDL_SetRenderTarget(renderer, nullptr)); sdl_check(SDL_SetRenderTarget(renderer, nullptr));
sdl_check(
SDL_SetRenderDrawColor(renderer, 0x00, 0x00, 0x00, SDL_ALPHA_OPAQUE)
);
SDL_RenderClear(renderer);
sdl_check(SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_NONE)); sdl_check(SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_NONE));
sdl_check(SDL_SetTextureBlendMode(texture, SDL_BLENDMODE_NONE)); // sdl_check(SDL_SetTextureBlendMode(texture, SDL_BLENDMODE_NONE));
sdl_check(SDL_RenderCopy(renderer, texture, nullptr, nullptr)); sdl_check(SDL_RenderCopy(renderer, texture, nullptr, nullptr));
SDL_RenderPresent(renderer); SDL_RenderPresent(renderer);
} }

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