100 lines
2.7 KiB
C++
100 lines
2.7 KiB
C++
#include "PostProcessing.hpp"
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#include "Mesh.hpp"
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#include "Shader.hpp"
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#include "Texture.hpp"
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#include "Framebuffer.hpp"
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#include "DrawContext.hpp"
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#include "PostEffect.hpp"
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#include "assets/Assets.hpp"
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#include <stdexcept>
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PostProcessing::PostProcessing(size_t effectSlotsCount)
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: effectSlots(effectSlotsCount) {
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// Fullscreen quad mesh bulding
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PostProcessingVertex meshData[]{
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{{-1.0f, -1.0f}},
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{{-1.0f, 1.0f}},
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{{1.0f, 1.0f}},
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{{-1.0f, -1.0f}},
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{{1.0f, 1.0f}},
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{{1.0f, -1.0f}},
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};
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quadMesh = std::make_unique<Mesh<PostProcessingVertex>>(meshData, 6, PostProcessingVertex::ATTRIBUTES);
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}
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PostProcessing::~PostProcessing() = default;
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void PostProcessing::use(DrawContext& context) {
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const auto& vp = context.getViewport();
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if (fbo) {
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fbo->resize(vp.x, vp.y);
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fboSecond->resize(vp.x, vp.y);
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} else {
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fbo = std::make_unique<Framebuffer>(vp.x, vp.y);
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fboSecond = std::make_unique<Framebuffer>(vp.x, vp.y);
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}
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context.setFramebuffer(fbo.get());
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}
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void PostProcessing::render(
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const DrawContext& context, const Assets& assets, float timer
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) {
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if (fbo == nullptr) {
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throw std::runtime_error("'use(...)' was never called");
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}
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int totalPasses = 0;
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for (const auto& effect : effectSlots) {
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totalPasses += (effect != nullptr && effect->isActive());
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}
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if (totalPasses == 0) {
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auto& effect = assets.require<PostEffect>("default");
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effect.use();
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fbo->getTexture()->bind();
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quadMesh->draw();
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return;
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}
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int currentPass = 1;
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for (const auto& effect : effectSlots) {
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if (effect == nullptr || !effect->isActive()) {
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continue;
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}
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auto& shader = effect->use();
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const auto& viewport = context.getViewport();
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shader.uniform1i("u_screen", 0);
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shader.uniform2i("u_screenSize", viewport);
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shader.uniform1f("u_timer", timer);
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fbo->getTexture()->bind();
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if (currentPass < totalPasses) {
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fboSecond->bind();
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}
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quadMesh->draw();
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if (currentPass < totalPasses) {
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fboSecond->unbind();
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std::swap(fbo, fboSecond);
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}
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currentPass++;
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}
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}
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void PostProcessing::setEffect(size_t slot, std::shared_ptr<PostEffect> effect) {
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effectSlots.at(slot) = std::move(effect);
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}
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PostEffect* PostProcessing::getEffect(size_t slot) {
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return effectSlots.at(slot).get();
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}
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std::unique_ptr<ImageData> PostProcessing::toImage() {
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return fbo->getTexture()->readData();
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}
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Framebuffer* PostProcessing::getFramebuffer() const {
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return fbo.get();
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}
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