using texture as framebuffer attachment so sampling in shaders is possible

include/scigl_render/buffer/frame_buffer.hpp

@@ -41,6 +41,9 @@ public:
   */
   void clear(float color = 0, float depth = 1, int stencil = 0) const;
 
+  /** returns the texture used for rendering */
+  GLuint get_texture() const;
+
   /** gets the maximum rbo size */
   static int get_max_size();
 
@@ -49,9 +52,9 @@ private:
   int width, height;
   // framebuffer object to render the texture into
   GLuint fbo;
-  // renderbuffer for renderng colors
-  GLuint color_rbo;
-  // renderbuffer object for the depth testing
+  // texture for renderng colors, can be sampled from
+  GLuint color_tex;
+  // renderbuffer object for the depth testing, does not allow sampling
   GLuint depth_stencil_rbo;
 };
 } // namespace scigl_render
\ No newline at end of file

src/buffer/frame_buffer.cpp

@@ -10,11 +10,11 @@ FrameBuffer::FrameBuffer(int width, int height, GLenum internal_format)
   // Create framebuffer with renderbuffer attachements
   glGenFramebuffers(1, &fbo);
   activate();
-  glGenRenderbuffers(1, &color_rbo);
-  glBindRenderbuffer(GL_RENDERBUFFER, color_rbo);
-  glRenderbufferStorage(GL_RENDERBUFFER, internal_format, width, height);
-  glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
-                            GL_RENDERBUFFER, color_rbo);
+  glGenTextures(1, &color_tex);
+  glBindTexture(GL_TEXTURE_2D, color_tex);
+  glTexStorage2D(GL_TEXTURE_2D, 1, internal_format, width, height);
+  glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+                         GL_TEXTURE_2D, color_tex, 0);
   glGenRenderbuffers(1, &depth_stencil_rbo);
   glBindRenderbuffer(GL_RENDERBUFFER, depth_stencil_rbo);
   glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, width, height);
@@ -33,7 +33,7 @@ FrameBuffer::~FrameBuffer()
 {
   glBindFramebuffer(GL_FRAMEBUFFER, 0);
   glDeleteRenderbuffers(1, &depth_stencil_rbo);
-  glDeleteRenderbuffers(1, &color_rbo);
+  glDeleteTextures(1, &color_tex);
 }
 
 void FrameBuffer::activate() const
@@ -56,6 +56,11 @@ void FrameBuffer::clear(float color, float depth, int stencil) const
   deactivate();
 }
 
+GLuint FrameBuffer::get_texture() const
+{
+  return color_tex;
+}
+
 int FrameBuffer::get_max_size()
 {
   int max_rbo_size;