...Anm2Ed 2.0

src/framebuffer.cpp

@@ -0,0 +1,88 @@
+#include "framebuffer.h"
+
+#include "texture.h"
+
+using namespace anm2ed::resource;
+using namespace glm;
+
+namespace anm2ed
+{
+  Framebuffer::Framebuffer()
+  {
+    glGenFramebuffers(1, &fbo);
+    glGenRenderbuffers(1, &rbo);
+    glGenTextures(1, &texture);
+    set();
+  }
+
+  Framebuffer::~Framebuffer()
+  {
+    if (!is_valid()) return;
+
+    glDeleteFramebuffers(1, &fbo);
+    glDeleteRenderbuffers(1, &rbo);
+    glDeleteTextures(1, &texture);
+  }
+
+  void Framebuffer::set()
+  {
+    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+
+    glBindTexture(GL_TEXTURE_2D, texture);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, size.x, size.y, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 0);
+
+    glBindRenderbuffer(GL_RENDERBUFFER, rbo);
+    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, size.x, size.y);
+    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, rbo);
+
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+  }
+
+  void Framebuffer::resize_check()
+  {
+    if (size != previousSize)
+    {
+      set();
+      previousSize = size;
+    }
+  }
+
+  void Framebuffer::size_set(vec2 size)
+  {
+    previousSize = this->size;
+    this->size = size;
+    resize_check();
+  }
+
+  std::vector<uint8_t> Framebuffer::pixels_get() const
+  {
+    auto count = size.x * size.y * texture::CHANNELS;
+    std::vector<uint8_t> pixels(count);
+
+    glReadBuffer(GL_COLOR_ATTACHMENT0);
+    glPixelStorei(GL_PACK_ALIGNMENT, 1);
+    glPixelStorei(GL_PACK_ROW_LENGTH, 0);
+    glReadPixels(0, 0, size.x, size.y, GL_RGBA, GL_UNSIGNED_BYTE, pixels.data());
+    glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
+
+    return pixels;
+  }
+
+  void Framebuffer::clear(vec4 color) const
+  {
+    glEnable(GL_BLEND);
+    glClearColor(color.r, color.g, color.b, color.a);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    if (color.a == 0.0f) glDisable(GL_BLEND);
+  }
+
+  bool Framebuffer::is_valid() const { return fbo != 0; }
+  void Framebuffer::viewport_set() const { glViewport(0, 0, size.x, size.y); }
+  void Framebuffer::bind() const { glBindFramebuffer(GL_FRAMEBUFFER, fbo); }
+  void Framebuffer::unbind() const { glBindFramebuffer(GL_FRAMEBUFFER, 0); }
+}