Geoff McLane wrote:
But do any native windows developers here know how to get
access to say glGenRenderbuffersEXT, glBindFramebufferEXT,
and some other GL extended functions, currently used in the
Atlas Map utility... exposed by the GL/glext.h header...
There still is support for it in SimGear, see simgear/screen/extensions.hxx
It works like this:
1. You need to add the extension support to extensions.hxx (see the
attached diff for EXT_framebuffer_object support, this has been
committed to CVS already by the way).
2. Define the function pointers like this:
glGenRenderbuffersProc pglGenRenderbuffers;
glBindFramebufferProc pglBindFramebuffer;
bool framebuffer_object_support = false;
3. in the code test if the extension is supported:
if (SGIsOpenGLExtensionSupported(GL_EXT_framebuffer_object))
{
pglGenRenderbuffers = SGGetGLProcAddress(glGenRenderbuffersEXT);
pglBindFramebuffer = SGGetGLProcAddress(glBindFramebufferEXT);
framebuffer_object_support = true;
}
4. When using the function:
if (framebuffer_object_support) {
pglGenRenderbuffers(1, color_rb)
// etc.
}
Erik
Index: extensions.hxx
===
RCS file: /var/cvs/SimGear-0.3/source/simgear/screen/extensions.hxx,v
retrieving revision 1.35
diff -p -u -r1.35 extensions.hxx
--- extensions.hxx 23 Jan 2010 11:41:04 - 1.35
+++ extensions.hxx 3 May 2010 06:48:13 -
@@ -202,7 +202,7 @@ typedef void (APIENTRY * glClientActiveT
#define GL_RGB_SCALE_ARB 0x8573
#define GL_ADD_SIGNED_ARB 0x8574
#define GL_INTERPOLATE_ARB 0x8575
-#define GL_SUBTRACT_ARB 0x84E7
+#define GL_SUBTRACT_ARB 0x84E7
#define GL_CONSTANT_ARB 0x8576
#define GL_PRIMARY_COLOR_ARB 0x8577
#define GL_PREVIOUS_ARB 0x8578
@@ -767,6 +767,62 @@ typedef void (APIENTRY * glGetVertexAttr
typedef GLboolean (APIENTRY * glIsProgramProc) (GLuint program);
/*
+ * EXT_framebuffer_objects
+ */
+#ifndef GL_EXT_framebuffer_object
+#define GL_EXT_framebuffer_object 1
+#define GL_NONE_EXT 0
+#define GL_FRAMEBUFFER_EXT 0x8D40
+#define GL_RENDERBUFFER_EXT 0x8D41
+#define GL_RGBA4_EXT 0x8056
+#define GL_RGB5_A1_EXT 0x8057
+#define GL_RGB565_EXT 0x8D62
+#define GL_DEPTH_COMPONENT16_EXT0x81A5
+#define GL_RENDERBUFFER_WIDTH_EXT0x8D42
+#define GL_RENDERBUFFER_HEIGHT_EXT0x8D43
+#define GL_RENDERBUFFER_INTERNAL_FORMAT_EXT 0x8D44
+#define GL_RENDERBUFFER_RED_SIZE_EXT0x8D50
+#define GL_RENDERBUFFER_GREEN_SIZE_EXT0x8D51
+#define GL_RENDERBUFFER_BLUE_SIZE_EXT0x8D52
+#define GL_RENDERBUFFER_ALPHA_SIZE_EXT0x8D53
+#define GL_RENDERBUFFER_DEPTH_SIZE_EXT0x8D54
+#define GL_RENDERBUFFER_STENCIL_SIZE_EXT 0x8D55
+#define GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE_EXT 0x8CD0
+#define GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME_EXT 0x8CD1
+#define GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL_EXT 0x8CD2
+#define GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE_EXT 0x8CD3
+#define GL_COLOR_ATTACHMENT0_EXT0x8CE0
+#define GL_DEPTH_ATTACHMENT_EXT 0x8D00
+#define GL_STENCIL_ATTACHMENT_EXT0x8D20
+#define GL_FRAMEBUFFER_COMPLETE_EXT0x8CD5
+#define GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT 0x8CD6
+#define GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT 0x8CD7
+#define GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT 0x8CD9
+#define GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT 0x8CDA
+#define GL_FRAMEBUFFER_UNSUPPORTED_EXT0x8CDD
+#define GL_FRAMEBUFFER_BINDING_EXT0x8CA6
+#define GL_RENDERBUFFER_BINDING_EXT0x8CA7
+#define GL_MAX_RENDERBUFFER_SIZE_EXT0x84E8
+#define GL_INVALID_FRAMEBUFFER_OPERATION_EXT 0x0506
+#endif
+
+typedef GLboolean (APIENTRY * glIsRenderbufferProc) (GLuint renderbuffer);
+typedef void (APIENTRY * glBindRenderbufferProc) (GLenum target, GLuint renderbuffer);
+typedef void (APIENTRY * glDeleteRenderbuffersProc) (GLsizei n, const GLuint* renderbuffers);
+typedef void (APIENTRY * glGenRenderbuffersProc) (GLsizei n, GLuint* renderbuffers);
+typedef void (APIENTRY * glRenderbufferStorageProc) (GLenum target, GLenum internalformat, GLsizei width, GLsizei height);
+typedef void (APIENTRY * glGetRenderbufferParameterivProc) (GLenum target, GLenum pname, GLint* params);
+typedef GLboolean (APIENTRY * glIsFramebufferProc) (GLuint framebuffer);
+typedef void (APIENTRY * glBindFramebufferProc) (GLenum target, GLuint framebuffer);
+typedef void (APIENTRY * glDeleteFramebuffersProc) (GLsizei n, const GLuint* framebuffers);
+typedef void (APIENTRY * glGenFramebuffersProc) (GLsizei n, GLuint* framebuffers);
+typedef GLenum (APIENTRY * glCheckFramebufferStatusProc) (GLenum target);
+typedef void (APIENTRY * glFramebufferRenderbufferProc) (GLenum target, GLenum attachment, GLenum renderbuffertarget, GLuint renderbuffer);
+typedef void (APIENTRY * glFramebufferTexture2DProc) (GLenum target, GLenum attachment, GLenum textarget, GLuint texture, GLint level);
+typedef void (APIENTRY *
