add files removed from test path

1 files changed, 237 insertions, 0 deletions

diff --git a/src/fbo.cc b/src/fbo.cc
new file mode 100644
index 0000000..a6677c1
--- /dev/null
+++ b/src/fbo.cc
@@ -0,0 +1,237 @@
+#include "fbo.h"
+#include "system-gl.h"
+#include <stdio.h>
+#include <iostream>
+using namespace std;
+
+fbo_t *fbo_new()
+{
+  fbo_t *fbo = new fbo_t;
+  fbo->fbo_id = 0;
+  fbo->old_fbo_id = 0;
+  fbo->renderbuf_id = 0;
+  fbo->depthbuf_id = 0;
+
+  return fbo;
+}
+
+bool use_ext()
+{
+  // do we need to use the EXT or ARB version?
+  if (!glewIsSupported("GL_ARB_framebuffer_object") &&
+        glewIsSupported("GL_EXT_framebuffer_object")) {
+    return true;
+  } else {
+    return false;
+  }
+}
+
+bool check_fbo_status()
+{
+	/* This code is based on user V-man code from
+	http://www.opengl.org/wiki/GL_EXT_framebuffer_multisample
+	See also: http://www.songho.ca/opengl/gl_fbo.html */
+	GLenum status;
+	bool result = false;
+	if (use_ext())
+		status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
+	else
+		status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
+
+	if (report_glerror("checking framebuffer status")) return false;
+
+	if (status == GL_FRAMEBUFFER_COMPLETE)
+		result = true;
+	else if (status == GL_FRAMEBUFFER_UNSUPPORTED)
+		cerr << "GL_FRAMEBUFFER_UNSUPPORTED\n";
+	else if (status == GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT)
+		cerr << "GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT\n";
+	else if (status == GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT)
+		cerr << "GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT\n";
+	else if (status == GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT)
+		cerr << "GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT\n";
+	else if (status == GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT)
+		cerr << "GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT\n";
+	else if (status == GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT)
+		cerr << "GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT\n";
+	else if (status == GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT)
+		cerr << "GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT\n";
+	else if (status == GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE_EXT)
+		cerr << "GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE_EXT\n";
+	else
+		cerr << "Unknown Code: glCheckFramebufferStatusEXT returned %i\n",status;
+	return result;
+}
+
+bool fbo_ext_init(fbo_t *fbo, size_t width, size_t height)
+{
+  // Generate and bind FBO
+  glGenFramebuffersEXT(1, &fbo->fbo_id);
+  if (report_glerror("glGenFramebuffersEXT")) return false;
+  glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo->fbo_id);
+  if (report_glerror("glBindFramebufferEXT")) return false;
+
+  // Generate depth and render buffers
+  glGenRenderbuffersEXT(1, &fbo->depthbuf_id);
+  glGenRenderbuffersEXT(1, &fbo->renderbuf_id);
+
+  // Create buffers with correct size
+  if (!fbo_resize(fbo, width, height)) return false;
+
+  // Attach render and depth buffers
+  glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, 
+                               GL_RENDERBUFFER_EXT, fbo->renderbuf_id);
+  if (report_glerror("specifying color render buffer EXT")) return false;
+
+
+  if (!check_fbo_status()) {
+    cerr << "Problem with OpenGL EXT framebuffer after specifying color render buffer.\n";
+    return false;
+  }
+
+	if (glewIsSupported("GL_EXT_packed_depth_stencil")) {
+		glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT,
+																 GL_RENDERBUFFER_EXT, fbo->depthbuf_id);
+		if (report_glerror("specifying depth render buffer EXT")) return false;
+
+		glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT,
+																 GL_RENDERBUFFER_EXT, fbo->depthbuf_id);
+		if (report_glerror("specifying stencil render buffer EXT")) return false;
+		
+		if (!check_fbo_status()) {
+			cerr << "Problem with OpenGL EXT framebuffer after specifying depth render buffer.\n";
+			return false;
+		}
+	}
+	else {
+		cerr << "Warning: Cannot create stencil buffer (GL_EXT_packed_depth_stencil not supported)\n";
+		glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, 
+																 GL_RENDERBUFFER_EXT, fbo->depthbuf_id);
+		if (report_glerror("specifying depth render buffer EXT")) return false;
+		
+		if (!check_fbo_status()) {
+			cerr << "Problem with OpenGL EXT framebuffer after specifying depth stencil render buffer.\n";
+			return false;
+		}
+	}
+
+  return true;
+}
+
+bool fbo_arb_init(fbo_t *fbo, size_t width, size_t height)
+{
+  // Generate and bind FBO
+  glGenFramebuffers(1, &fbo->fbo_id);
+  if (report_glerror("glGenFramebuffers")) return false;
+  glBindFramebuffer(GL_FRAMEBUFFER, fbo->fbo_id);
+  if (report_glerror("glBindFramebuffer")) return false;
+
+  // Generate depth and render buffers
+  glGenRenderbuffers(1, &fbo->depthbuf_id);
+  glGenRenderbuffers(1, &fbo->renderbuf_id);
+
+  // Create buffers with correct size
+  if (!fbo_resize(fbo, width, height)) return false;
+
+  // Attach render and depth buffers
+  glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, 
+                               GL_RENDERBUFFER, fbo->renderbuf_id);
+  if (report_glerror("specifying color render buffer")) return false;
+
+  if (!check_fbo_status()) {
+    cerr << "Problem with OpenGL framebuffer after specifying color render buffer.\n";
+    return false;
+  }
+
+  //glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, 
+  // to prevent Mesa's software renderer from crashing, do this in two stages. 
+  // ie. instead of using GL_DEPTH_STENCIL_ATTACHMENT, do DEPTH then STENCIL. 
+  glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
+                               GL_RENDERBUFFER, fbo->depthbuf_id);
+  glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, 
+                               GL_RENDERBUFFER, fbo->depthbuf_id);
+  if (report_glerror("specifying depth stencil render buffer")) return false;
+
+  if (!check_fbo_status()) {
+    cerr << "Problem with OpenGL framebuffer after specifying depth render buffer.\n";
+    return false;
+  }
+
+  return true;
+}
+
+
+bool fbo_init(fbo_t *fbo, size_t width, size_t height)
+{
+  /*
+  Some OpenGL drivers include the framebuffer functions but not with
+  core or ARB names, only with the EXT name. This has been worked-around
+  by deciding at runtime, using GLEW, which version needs to be used. See also:
+  
+  http://www.opengl.org/wiki/Framebuffer_Object
+  http://stackoverflow.com/questions/6912988/glgenframebuffers-or-glgenframebuffersex
+  http://www.devmaster.net/forums/showthread.php?t=10967
+  */
+
+  bool result = false;
+  if (glewIsSupported("GL_ARB_framebuffer_object"))
+    result = fbo_arb_init(fbo, width, height);
+  else if (use_ext())
+    result = fbo_ext_init(fbo, width, height);
+  else
+    cerr << "Framebuffer Object extension not found by GLEW\n";
+  return result;
+}
+
+bool fbo_resize(fbo_t *fbo, size_t width, size_t height)
+{
+  if (use_ext()) {
+    glBindRenderbufferEXT(GL_RENDERBUFFER, fbo->depthbuf_id);
+		if (glewIsSupported("GL_EXT_packed_depth_stencil")) {
+			glRenderbufferStorageEXT(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, width, height);
+			if (report_glerror("creating EXT depth stencil render buffer")) return false;
+		}
+		else {
+			glRenderbufferStorageEXT(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, width, height);
+			if (report_glerror("creating EXT depth render buffer")) return false;
+		}
+
+    glBindRenderbufferEXT(GL_RENDERBUFFER, fbo->renderbuf_id);
+    glRenderbufferStorageEXT(GL_RENDERBUFFER, GL_RGBA8, width, height);
+    if (report_glerror("creating EXT color render buffer")) return false;
+  } else {
+    glBindRenderbuffer(GL_RENDERBUFFER, fbo->renderbuf_id);
+    glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA8, width, height);
+    if (report_glerror("creating color render buffer")) return false;
+
+    glBindRenderbuffer(GL_RENDERBUFFER, fbo->depthbuf_id);
+    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, width, height);
+    if (report_glerror("creating depth stencil render buffer")) return false;
+
+  }
+
+  return true;
+}
+
+void fbo_delete(fbo_t *fbo)
+{
+  delete fbo;
+}
+
+GLuint fbo_bind(fbo_t *fbo)
+{
+  glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint *)&fbo->old_fbo_id);
+  if (use_ext())
+    glBindFramebufferEXT(GL_FRAMEBUFFER, fbo->fbo_id);
+  else
+    glBindFramebuffer(GL_FRAMEBUFFER, fbo->fbo_id);
+  return fbo->old_fbo_id;
+}
+
+void fbo_unbind(fbo_t *fbo)
+{
+  if (use_ext())
+    glBindFramebufferEXT(GL_FRAMEBUFFER, fbo->old_fbo_id);
+  else
+    glBindFramebuffer(GL_FRAMEBUFFER, fbo->old_fbo_id);
+}