mirror of
https://github.com/brl/mutter.git
synced 2024-12-23 19:42:05 +00:00
992d5f7fb6
It should be quite acceptable to use a texture without defining any texture coords. For example a shader may be in use that is doing texture lookups without referencing the texture coordinates. Also it should be possible to replace the vertex colors using a texture layer without a texture but with a constant layer color. enable_state_for_drawing_buffer no longer sets any disabled layers in the overrides. Instead of counting the number of units with texture coordinates it now keeps them in a mask. This means there can now be gaps in the list of enabled texture coordinate arrays. To cope with this, the Cogl context now also stores a mask to track the enabled arrays. Instead of code manually iterating each enabled array to disable them, there is now an internal function called _cogl_disable_texcoord_arrays which disables a given mask. I think this could also fix potential bugs when a vertex buffer has gaps in the texture coordinate attributes that it provides. For example if the vertex buffer only had texture coordinates for layer 2 then the disabling code would not disable the coordinates for layers 0 and 1 even though they are not used. This could cause a crash if the previous data for those arrays is no longer valid. http://bugzilla.openedhand.com/show_bug.cgi?id=2132
143 lines
4.1 KiB
C
143 lines
4.1 KiB
C
/*
|
|
* Cogl
|
|
*
|
|
* An object oriented GL/GLES Abstraction/Utility Layer
|
|
*
|
|
* Copyright (C) 2007,2008,2009 Intel Corporation.
|
|
*
|
|
* 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, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
*
|
|
*/
|
|
|
|
#ifndef __COGL_CONTEXT_H
|
|
#define __COGL_CONTEXT_H
|
|
|
|
#include "cogl-internal.h"
|
|
#include "cogl-context-driver.h"
|
|
#include "cogl-primitives.h"
|
|
#include "cogl-clip-stack.h"
|
|
#include "cogl-matrix-stack.h"
|
|
#include "cogl-material-private.h"
|
|
#include "cogl-atlas.h"
|
|
#include "cogl-buffer-private.h"
|
|
|
|
typedef struct
|
|
{
|
|
GLfloat v[3];
|
|
GLfloat t[2];
|
|
GLubyte c[4];
|
|
} CoglTextureGLVertex;
|
|
|
|
typedef struct
|
|
{
|
|
/* Features cache */
|
|
CoglFeatureFlags feature_flags;
|
|
gboolean features_cached;
|
|
|
|
CoglHandle default_material;
|
|
|
|
/* Enable cache */
|
|
unsigned long enable_flags;
|
|
guint8 color_alpha;
|
|
|
|
gboolean enable_backface_culling;
|
|
CoglFrontWinding flushed_front_winding;
|
|
|
|
gboolean indirect;
|
|
|
|
/* A few handy matrix constants */
|
|
CoglMatrix identity_matrix;
|
|
CoglMatrix y_flip_matrix;
|
|
|
|
/* Client-side matrix stack or NULL if none */
|
|
CoglMatrixMode flushed_matrix_mode;
|
|
GList *texture_units;
|
|
|
|
/* Materials */
|
|
CoglHandle simple_material;
|
|
CoglHandle source_material;
|
|
|
|
/* Textures */
|
|
CoglHandle default_gl_texture_2d_tex;
|
|
CoglHandle default_gl_texture_rect_tex;
|
|
|
|
/* Batching geometry... */
|
|
/* We journal the texture rectangles we want to submit to OpenGL so
|
|
* we have an oppertunity to optimise the final order so that we
|
|
* can batch things together. */
|
|
GArray *journal;
|
|
GArray *logged_vertices;
|
|
GArray *polygon_vertices;
|
|
|
|
/* Some simple caching, to minimize state changes... */
|
|
CoglHandle current_material;
|
|
unsigned long current_material_flags;
|
|
CoglMaterialFlushOptions current_material_flush_options;
|
|
GArray *current_layers;
|
|
/* Bitmask of texture coordinates arrays that are enabled */
|
|
unsigned int texcoord_arrays_enabled;
|
|
|
|
/* PBOs */
|
|
/* This can be used to check if a pbo is bound */
|
|
CoglBuffer *current_pbo;
|
|
|
|
/* Framebuffers */
|
|
GSList *framebuffer_stack;
|
|
CoglHandle window_buffer;
|
|
gboolean dirty_bound_framebuffer;
|
|
gboolean dirty_gl_viewport;
|
|
|
|
/* Primitives */
|
|
CoglHandle current_path;
|
|
CoglHandle stencil_material;
|
|
|
|
/* Pre-generated VBOs containing indices to generate GL_TRIANGLES
|
|
out of a vertex array of quads */
|
|
CoglHandle quad_indices_byte;
|
|
unsigned int quad_indices_short_len;
|
|
CoglHandle quad_indices_short;
|
|
|
|
gboolean in_begin_gl_block;
|
|
|
|
CoglHandle texture_download_material;
|
|
|
|
CoglAtlas *atlas;
|
|
CoglHandle atlas_texture;
|
|
|
|
/* This debugging variable is used to pick a colour for visually
|
|
displaying the quad batches. It needs to be global so that it can
|
|
be reset by cogl_clear. It needs to be reset to increase the
|
|
chances of getting the same colour during an animation */
|
|
guint8 journal_rectangles_color;
|
|
|
|
/* Cached value for GL_MAX_TEXTURE_UNITS to avoid calling
|
|
glGetInteger too often */
|
|
GLint max_texture_units;
|
|
|
|
CoglContextDriver drv;
|
|
} 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 */
|