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@@ -0,0 +1,138 @@
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+#include "CreditsState.hxx"
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+
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+#include "GameStateManager.hxx"
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+
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+#include <type_traits>
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+
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+CreditsState::CreditsState()
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+ :font_{"kenney_pixel.ttf"}, jetbrains_ai_logo_{"jetbrains-ai-logo.png"}, kenney_logo_{"kenney-logo.png"},
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+ sdl_logo_{"SDL_logo.png"}, boost_logo_{"Boost-logo.png"}
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+{
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+}
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+
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+void CreditsState::on_enter(GameStateManager& gsm)
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+{
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+ TTF_Font* const font = font_;
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+
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+ scroll_y_ = 0.0;
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+ done_ = false;
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+ scroll_items_ = {
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+ "Copyright © 2024, Felix Bytow <drako@drako.guru>",
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+ External{jetbrains_ai_logo_, "with some help from JetBrains AI Assistant"},
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+ External{kenney_logo_, "Font & UI Pack from kenney.nl"},
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+ sdl_logo_,
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+ boost_logo_,
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+ };
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+
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+ int summed_size = -50;
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+ for (auto const& item: scroll_items_) {
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+ summed_size += std::visit([font]<typename T>(T const& it) {
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+ int w, h = 0;
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+ if constexpr (std::is_same_v<T, char const*>) {
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+ TTF_SizeUTF8(font, it, &w, &h);
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+ }
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+ else if constexpr (std::is_same_v<T, External>) {
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+ int logo_h, text_h;
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+ TTF_SizeUTF8(font, it.text_, &w, &text_h);
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+ SDL_QueryTexture(it.texture_, nullptr, nullptr, &w, &logo_h);
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+ h = logo_h+10+text_h;
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+ }
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+ else if constexpr (std::is_same_v<T, SDL_Texture*>) {
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+ SDL_QueryTexture(it, nullptr, nullptr, &w, &h);
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+ }
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+ return h;
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+ }, item);
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+ summed_size += 50;
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+ }
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+ scroll_size_ = static_cast<double>(summed_size);
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+}
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+
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+void CreditsState::on_event(GameStateManager& gsm, SDL_Event const& event)
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+{
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+ if (event.type==SDL_KEYUP) {
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+ switch (event.key.keysym.scancode) {
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+ default:
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+ break;
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+ case SDL_SCANCODE_ESCAPE:
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+ [[fallthrough]];
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+ case SDL_SCANCODE_RETURN:
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+ [[fallthrough]];
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+ case SDL_SCANCODE_SPACE:
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+ gsm.pop_state();
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+ break;
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+ }
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+ }
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+}
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+
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+void CreditsState::update(GameStateManager& gsm, std::chrono::milliseconds const delta_time)
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+{
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+ if (done_) {
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+ gsm.pop_state();
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+ }
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+
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+ scroll_y_ += 0.05*static_cast<double>(delta_time.count());
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+}
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+
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+void CreditsState::render(SDLRenderer& renderer)
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+{
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+ TTF_Font* const font = font_;
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+
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+ SDL_SetRenderDrawColor(renderer, 0, 0, 0, SDL_ALPHA_OPAQUE);
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+ SDL_RenderClear(renderer);
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+
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+ int window_width = 0, window_height = 0;
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+ SDL_GetRendererOutputSize(renderer, &window_width, &window_height);
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+
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+ int y = window_height-static_cast<int>(scroll_y_);
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+ if (y<=-static_cast<int>(scroll_size_)) {
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+ // everything is now outside the screen at the top
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+ done_ = true;
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+ }
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+
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+ for (auto const& item: scroll_items_) {
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+ std::visit([&renderer, &y, window_width, font]<typename T>(T const& it) {
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+ int h = 0;
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+ if constexpr (std::is_same_v<T, char const*>) {
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+ auto const surface = TTF_RenderUTF8_Solid(font, it, {255, 255, 255, SDL_ALPHA_OPAQUE});
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+ auto const texture = SDL_CreateTextureFromSurface(renderer, surface);
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+ SDL_FreeSurface(surface);
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+
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+ int w;
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+ SDL_QueryTexture(texture, nullptr, nullptr, &w, &h);
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+ SDL_Rect const rect{.x = (window_width-w)/2, .y = y, .w = w, .h = h};
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+ SDL_RenderCopy(renderer, texture, nullptr, &rect);
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+
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+ SDL_DestroyTexture(texture);
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+ }
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+ else if constexpr (std::is_same_v<T, External>) {
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+ int w, logo_h, text_h;
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+
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+ SDL_QueryTexture(it.texture_, nullptr, nullptr, &w, &logo_h);
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+ SDL_Rect const logo_rect{.x = (window_width-w)/2, .y = y, .w = w, .h = logo_h};
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+ SDL_RenderCopy(renderer, it.texture_, nullptr, &logo_rect);
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+
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+ auto const surface = TTF_RenderUTF8_Solid(font, it.text_, {255, 255, 255, SDL_ALPHA_OPAQUE});
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+ auto const texture = SDL_CreateTextureFromSurface(renderer, surface);
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+ SDL_FreeSurface(surface);
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+
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+ SDL_QueryTexture(texture, nullptr, nullptr, &w, &text_h);
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+ SDL_Rect const text_rect{.x = (window_width-w)/2, .y = y+logo_h+10, .w = w, .h = text_h};
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+ SDL_RenderCopy(renderer, texture, nullptr, &text_rect);
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+
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+ SDL_DestroyTexture(texture);
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+
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+ h = logo_h+10+text_h;
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+ }
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+ else if constexpr (std::is_same_v<T, SDL_Texture*>) {
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+ int w;
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+ SDL_QueryTexture(it, nullptr, nullptr, &w, &h);
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+ SDL_Rect const rect{.x = (window_width-w)/2, .y = y, .w = w, .h = h};
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+ SDL_RenderCopy(renderer, it, nullptr, &rect);
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+ }
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+
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+ y += h+50;
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+ }, item);
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+ }
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+
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+ SDL_RenderPresent(renderer);
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+}
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