neop/randomwalk
neop/randomwalk
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

blended visuals

Browse source 
blending somehow never reaches draw color
This commit is contained in:
Jakob Hördt 2024-08-04 20:08:01 +02:00
parent 767607ede1
commit 1a3fccfe2d
1 changed files with 7 additions and 16 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

23
main.cpp
View file

@ -53,16 +53,6 @@ auto operator+(SDL_Point a, SDL_Point b) {
return SDL_Point{.x = a.x + b.x, .y = a.y + b.y};
}
auto operator<=>(const SDL_Point& a, const SDL_Point& b) {
auto y_comp = a.x <=> b.x;
if (y_comp != std::strong_ordering::equal) { return y_comp; }
return a.y <=> b.y;
}
auto operator==(const SDL_Point& a, const SDL_Point& b) {
return a.x == b.x && a.y == b.y;
}
// constexpr int width = 1000;
// constexpr int height = 1000;
constexpr int width = 3440;
@ -119,7 +109,8 @@ int main() try {
sdl_check(SDL_SetRenderTarget(renderer, texture));
sdl_check(SDL_SetRenderDrawColor(renderer, 0xdb, 0xd7, 0xc0, SDL_ALPHA_OPAQUE));
sdl_check(SDL_RenderClear(renderer));
sdl_check(SDL_SetRenderDrawColor(renderer, 0x0d, 0x0f, 0x14, SDL_ALPHA_OPAQUE));
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};
constexpr SDL_Point directions[] = {
@ -128,10 +119,7 @@ int main() try {
std::mt19937_64 rne(std::random_device{}());
std::uniform_int_distribution dist(0, 3);
// aarrggbb??
constexpr Uint32 bg_color = 0xffdbd7c0;
constexpr Uint32 walk_color = 0xff0d0f14;
constexpr auto batchsize = 100;
constexpr auto batchsize = 1000;
const auto start_time = clock::now();
auto next_poll_events_time = start_time;
@ -151,7 +139,6 @@ int main() try {
);
}
sdl_check(SDL_SetRenderTarget(renderer, texture));
std::array<SDL_Point, batchsize> point_batch;
for (auto step = 0z; step < batchsize; ++step) {
SDL_Point newpoint;
@ -162,9 +149,13 @@ int main() try {
pos = 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()));
sdl_check(SDL_SetRenderTarget(renderer, nullptr));
sdl_check(SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_NONE));
sdl_check(SDL_SetTextureBlendMode(texture, SDL_BLENDMODE_NONE));
sdl_check(SDL_RenderCopy(renderer, texture, nullptr, nullptr));
SDL_RenderPresent(renderer);
}