src/framebuffer.cpp

   1 #include "framebuffer.h"
   2 #include "gl_core44.h"
   3
   4 using namespace IPDF;
   5
   6 void FrameBuffer::Create(int w, int h)
   7 {
   8         if (m_render_texture)
   9         {
  10                 Destroy();
  11         }
  12         m_width = w;
  13         m_height = h;
  14         glGenTextures(1, &m_render_texture);
  15         glGenFramebuffers(1, &m_render_fbo);
  16
  17         glBindTexture(GL_TEXTURE_2D, m_render_texture);
  18         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
  19
  20         glBindFramebuffer(GL_FRAMEBUFFER, m_render_fbo);
  21
  22         glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, m_render_texture, 0);
  23
  24         glBindFramebuffer(GL_FRAMEBUFFER, 0);
  25         glBindTexture(GL_TEXTURE_2D, 0);
  26 }
  27
  28 void FrameBuffer::Destroy()
  29 {
  30         if (!m_render_texture) return;
  31         glDeleteFramebuffers(1, &m_render_fbo);
  32         glDeleteTextures(1, &m_render_texture);
  33 }
  34
  35 void FrameBuffer::Bind()
  36 {
  37         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, m_render_fbo);
  38 }
  39
  40 void FrameBuffer::UnBind()
  41 {
  42         glBindFramebuffer(GL_FRAMEBUFFER, 0);
  43 }
  44
  45 void FrameBuffer::Blit()
  46 {
  47         glBindFramebuffer(GL_READ_FRAMEBUFFER, m_render_fbo);
  48         glBlitFramebuffer(0, 0, m_width, m_height, 0, 0, m_width, m_height, GL_COLOR_BUFFER_BIT, GL_NEAREST);
  49 }
  50
  51 void FrameBuffer::Clear(float r, float g, float b, float a)
  52 {
  53         Bind();
  54         glClearColor(r,g,b,a);
  55         glClear(GL_COLOR_BUFFER_BIT);
  56 }
  57