116 lines
3.0 KiB
C++
116 lines
3.0 KiB
C++
#include "Canvas.h"
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#include "EngineCore/Game.h"
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#include "EngineFrame/Render/RenderManager.h"
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Canvas::Canvas(VecSize size)
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{
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m_size = size;
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m_renderRect = {0, 0, size.width, size.height};
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m_rect = {0, 0, (float)size.width, (float)size.height};
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m_texture = new Texture();
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m_texture->Init(VecSize(Game::GetInstance().Screen_W, Game::GetInstance().Screen_H));
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Actor::Init();
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glGenFramebuffers(1, &m_fbo);
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glBindFramebuffer(GL_FRAMEBUFFER, m_fbo);
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// 将目标纹理附加到FBO的颜色附着点
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glFramebufferTexture2D(
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GL_FRAMEBUFFER, // 帧缓冲类型
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GL_COLOR_ATTACHMENT0, // 颜色附着点（可多个，这里用第一个）
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GL_TEXTURE_2D, // 纹理类型
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m_texture->getID(), // 目标纹理ID
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0 // 多级渐远纹理级别
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);
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glBindFramebuffer(GL_FRAMEBUFFER, 0); // 解绑FBO
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}
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void Canvas::PreRender()
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{
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m_rect.x = GetWorldPos().x;
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m_rect.y = GetWorldPos().y;
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}
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void Canvas::Render()
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{
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RenderManager *renderer = Game::GetInstance().GetRenderer();
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SDL_FPoint AnchorPos = {0, 0};
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if (m_dirty)
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{
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glBindFramebuffer(GL_FRAMEBUFFER, m_fbo); // 绑定FBO
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glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
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glClear(GL_COLOR_BUFFER_BIT);
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for (auto &info : m_drawQueue)
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{
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renderer->DrawTexture(m_imgMap[info.texture], nullptr, &info.rect, 0.f, &AnchorPos, SDL_FLIP_NONE);
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}
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glBindFramebuffer(GL_FRAMEBUFFER, 0); // 解绑FBO
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m_dirty = false;
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}
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renderer->SetCurrentShaderProgram("flip_y");
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// 混合
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if (this->_BlendMode != NONE)
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Blend();
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renderer->DrawTexture(m_texture, &m_renderRect, &m_rect, 0.f, &AnchorPos, SDL_FLIP_NONE);
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// 还原混合
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if (this->_BlendMode != NONE)
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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renderer->SetCurrentShaderProgram("normal");
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}
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void Canvas::DrawImg(std::string img, int index, Vec2 pos)
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{
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m_dirty = true;
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ImgKey key = {img, index};
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DrawInfo info;
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info.rect.x = pos.x;
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info.rect.y = pos.y;
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info.texture = key;
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if (m_imgMap.find(key) == m_imgMap.end())
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{
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RefPtr<Texture> tex = new Texture();
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tex->Init(img, index);
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m_imgMap[key] = tex;
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}
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info.rect.w = m_imgMap[key]->getSize().width;
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info.rect.h = m_imgMap[key]->getSize().height;
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m_drawQueue.push_back(info);
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}
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void Canvas::DrawImg(std::string img, int index, SDL_FRect rect)
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{
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m_dirty = true;
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ImgKey key = {img, index};
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DrawInfo info;
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info.rect = rect;
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info.texture = key;
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if (m_imgMap.find(key) == m_imgMap.end())
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{
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RefPtr<Texture> tex = new Texture();
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tex->Init(img, index);
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m_imgMap[key] = tex;
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}
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m_drawQueue.push_back(info);
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}
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void Canvas::Clear()
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{
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m_drawQueue.clear();
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m_dirty = true;
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}
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void Canvas::Blend()
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{
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switch (this->_BlendMode)
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{
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case LINEARDODGE:
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glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE, GL_ZERO, GL_ONE);
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break;
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}
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}
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