mutter/clutter/cogl/gl/cogl-context.h
Neil Roberts 82d43ffe64 Bug 1189 - Backface culling
* clutter/cogl/gl/cogl-texture.c (cogl_texture_polygon)
	(_cogl_texture_quad_sw, _cogl_texture_quad_hw):
	* clutter/cogl/gles/cogl-texture.c (cogl_texture_polygon)
	(_cogl_texture_quad_sw, _cogl_texture_quad_hw): Enable backface
	culling in GL if it is requested.

	* clutter/cogl/gles/cogl-texture.c (_cogl_texture_quad_sw)
	(_cogl_texture_quad_hw):
	* clutter/cogl/gl/cogl-texture.c (_cogl_texture_quad_sw)
	(_cogl_texture_quad_hw): Reorder the
	vertices so that they are counter-clockwise.

	* clutter/cogl/gles/cogl-context.h (CoglContext): 
	* clutter/cogl/gl/cogl-context.h (CoglContext): Added a flag to
	store whether backface culling is currently enabled.

	* clutter/cogl/gles/cogl.c (cogl_enable_backface_culling): 
	* clutter/cogl/gl/cogl.c (cogl_enable_backface_culling): New
	function

	* doc/reference/cogl/cogl-sections.txt: Add
	cogl_enable_backface_culling
2008-10-27 14:36:52 +00:00

111 lines
4.1 KiB
C

/*
* Clutter COGL
*
* A basic GL/GLES Abstraction/Utility Layer
*
* Authored By Matthew Allum <mallum@openedhand.com>
*
* Copyright (C) 2007 OpenedHand
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __COGL_CONTEXT_H
#define __COGL_CONTEXT_H
#include "cogl-primitives.h"
typedef struct
{
/* Features cache */
CoglFeatureFlags feature_flags;
gboolean features_cached;
GLint num_stencil_bits;
/* Enable cache */
gulong enable_flags;
guint8 color_alpha;
COGLenum blend_src_factor;
COGLenum blend_dst_factor;
gboolean enable_backface_culling;
/* Primitives */
CoglFixedVec2 path_start;
CoglFixedVec2 path_pen;
CoglFloatVec2 *path_nodes;
guint path_nodes_cap;
guint path_nodes_size;
CoglFixedVec2 path_nodes_min;
CoglFixedVec2 path_nodes_max;
/* Cache of inverse projection matrix */
GLfloat inverse_projection[16];
/* Textures */
GArray *texture_handles;
/* Framebuffer objects */
GArray *fbo_handles;
CoglBufferTarget draw_buffer;
/* Shaders */
GArray *shader_handles;
/* Programs */
GArray *program_handles;
/* Relying on glext.h to define these */
COGL_PFNGLGENRENDERBUFFERSEXTPROC pf_glGenRenderbuffersEXT;
COGL_PFNGLDELETERENDERBUFFERSEXTPROC pf_glDeleteRenderbuffersEXT;
COGL_PFNGLBINDRENDERBUFFEREXTPROC pf_glBindRenderbufferEXT;
COGL_PFNGLRENDERBUFFERSTORAGEEXTPROC pf_glRenderbufferStorageEXT;
COGL_PFNGLGENFRAMEBUFFERSEXTPROC pf_glGenFramebuffersEXT;
COGL_PFNGLBINDFRAMEBUFFEREXTPROC pf_glBindFramebufferEXT;
COGL_PFNGLFRAMEBUFFERTEXTURE2DEXTPROC pf_glFramebufferTexture2DEXT;
COGL_PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC pf_glFramebufferRenderbufferEXT;
COGL_PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC pf_glCheckFramebufferStatusEXT;
COGL_PFNGLDELETEFRAMEBUFFERSEXTPROC pf_glDeleteFramebuffersEXT;
COGL_PFNGLBLITFRAMEBUFFEREXTPROC pf_glBlitFramebufferEXT;
COGL_PFNGLRENDERBUFFERSTORAGEMULTISAMPLEEXTPROC pf_glRenderbufferStorageMultisampleEXT;
COGL_PFNGLCREATEPROGRAMOBJECTARBPROC pf_glCreateProgramObjectARB;
COGL_PFNGLCREATESHADEROBJECTARBPROC pf_glCreateShaderObjectARB;
COGL_PFNGLSHADERSOURCEARBPROC pf_glShaderSourceARB;
COGL_PFNGLCOMPILESHADERARBPROC pf_glCompileShaderARB;
COGL_PFNGLATTACHOBJECTARBPROC pf_glAttachObjectARB;
COGL_PFNGLLINKPROGRAMARBPROC pf_glLinkProgramARB;
COGL_PFNGLUSEPROGRAMOBJECTARBPROC pf_glUseProgramObjectARB;
COGL_PFNGLGETUNIFORMLOCATIONARBPROC pf_glGetUniformLocationARB;
COGL_PFNGLDELETEOBJECTARBPROC pf_glDeleteObjectARB;
COGL_PFNGLGETINFOLOGARBPROC pf_glGetInfoLogARB;
COGL_PFNGLGETOBJECTPARAMETERIVARBPROC pf_glGetObjectParameterivARB;
COGL_PFNGLUNIFORM1FARBPROC pf_glUniform1fARB;
} CoglContext;
CoglContext *
_cogl_context_get_default ();
/* Obtains the context and returns retval if NULL */
#define _COGL_GET_CONTEXT(ctxvar, retval) \
CoglContext *ctxvar = _cogl_context_get_default (); \
if (ctxvar == NULL) return retval;
#define NO_RETVAL
#endif /* __COGL_CONTEXT_H */