b2e735ff7f
The GL or GLES library is now dynamically loaded by the CoglRenderer so that it can choose between GL, GLES1 and GLES2 at runtime. The library is loaded by the renderer because it needs to be done before calling eglInitialize. There is a new environment variable called COGL_DRIVER to choose between gl, gles1 or gles2. The #ifdefs for HAVE_COGL_GL, HAVE_COGL_GLES and HAVE_COGL_GLES2 have been changed so that they don't assume the ifdefs are mutually exclusive. They haven't been removed entirely so that it's possible to compile the GLES backends without the the enums from the GL headers. When using GLX the winsys additionally dynamically loads libGL because that also contains the GLX API. It can't be linked in directly because that would probably conflict with the GLES API if the EGL is selected. When compiling with EGL support the library links directly to libEGL because it doesn't contain any GL API so it shouldn't have any conflicts. When building for WGL or OSX Cogl still directly links against the GL API so there is a #define in config.h so that Cogl won't try to dlopen the library. Cogl-pango previously had a #ifdef to detect when the GL backend is used so that it can sneakily pass GL_QUADS to cogl_vertex_buffer_draw. This is now changed so that it queries the CoglContext for the backend. However to get this to work Cogl now needs to export the _cogl_context_get_default symbol and cogl-pango needs some extra -I flags to so that it can include cogl-context-private.h
309 lines
10 KiB
C
309 lines
10 KiB
C
/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2007,2008,2009 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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*
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*/
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#ifndef __COGL_CONTEXT_PRIVATE_H
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#define __COGL_CONTEXT_PRIVATE_H
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#include "cogl-internal.h"
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#include "cogl-context.h"
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#include "cogl-winsys-private.h"
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#include "cogl-flags.h"
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#ifdef COGL_HAS_XLIB_SUPPORT
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#include "cogl-xlib-private.h"
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#endif
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#include "cogl-display-private.h"
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#include "cogl-primitives.h"
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#include "cogl-clip-stack.h"
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#include "cogl-matrix-stack.h"
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#include "cogl-pipeline-private.h"
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#include "cogl-buffer-private.h"
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#include "cogl-bitmask.h"
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#include "cogl-atlas.h"
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#include "cogl-texture-driver.h"
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typedef struct
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{
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GLfloat v[3];
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GLfloat t[2];
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GLubyte c[4];
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} CoglTextureGLVertex;
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struct _CoglContext
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{
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CoglObject _parent;
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CoglDisplay *display;
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CoglDriver driver;
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/* vtable for the texture driver functions */
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const CoglTextureDriver *texture_driver;
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/* Features cache */
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CoglFeatureFlags feature_flags;
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CoglPrivateFeatureFlags private_feature_flags;
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CoglHandle default_pipeline;
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CoglHandle default_layer_0;
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CoglHandle default_layer_n;
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CoglHandle dummy_layer_dependant;
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/* Enable cache */
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unsigned long enable_flags;
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gboolean enable_backface_culling;
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CoglFrontWinding flushed_front_winding;
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/* A few handy matrix constants */
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CoglMatrix identity_matrix;
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CoglMatrix y_flip_matrix;
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/* Client-side matrix stack or NULL if none */
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CoglMatrixMode flushed_matrix_mode;
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/* On GLES2 we need to track the matrices separately because the are
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stored in GLSL uniforms rather than using the fixed function
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API. We keep track of the matrix stack that Cogl is trying to
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flush so we can flush it later after the program is generated. A
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reference is taken on the stacks. */
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CoglMatrixStack *flushed_modelview_stack;
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CoglMatrixStack *flushed_projection_stack;
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GArray *texture_units;
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int active_texture_unit;
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CoglPipelineFogState legacy_fog_state;
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/* Pipelines */
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CoglPipeline *opaque_color_pipeline; /* used for set_source_color */
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CoglPipeline *blended_color_pipeline; /* used for set_source_color */
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CoglPipeline *texture_pipeline; /* used for set_source_texture */
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GString *codegen_header_buffer;
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GString *codegen_source_buffer;
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GList *source_stack;
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int legacy_state_set;
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#ifdef HAVE_COGL_GL
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GHashTable *arbfp_cache;
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#endif
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/* Textures */
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CoglHandle default_gl_texture_2d_tex;
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CoglHandle default_gl_texture_rect_tex;
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/* Central list of all framebuffers so all journals can be flushed
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* at any time. */
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GList *framebuffers;
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/* Global journal buffers */
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GArray *journal_flush_attributes_array;
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GArray *journal_clip_bounds;
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GArray *polygon_vertices;
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/* Some simple caching, to minimize state changes... */
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CoglPipeline *current_pipeline;
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unsigned long current_pipeline_changes_since_flush;
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gboolean current_pipeline_skip_gl_color;
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unsigned long current_pipeline_age;
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GArray *pipeline0_nodes;
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GArray *pipeline1_nodes;
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/* Bitmask of attributes enabled. On GLES2 these are the vertex
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attribute numbers and on regular GL these are only used for the
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texture coordinate arrays */
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CoglBitmask arrays_enabled;
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/* These are temporary bitmasks that are used when disabling
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texcoord arrays. They are here just to avoid allocating new ones
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each time */
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CoglBitmask arrays_to_change;
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CoglBitmask temp_bitmask;
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gboolean gl_blend_enable_cache;
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gboolean depth_test_enabled_cache;
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CoglDepthTestFunction depth_test_function_cache;
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gboolean depth_writing_enabled_cache;
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float depth_range_near_cache;
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float depth_range_far_cache;
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gboolean legacy_depth_test_enabled;
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float point_size_cache;
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CoglBuffer *current_buffer[COGL_BUFFER_BIND_TARGET_COUNT];
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/* Framebuffers */
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GSList *framebuffer_stack;
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CoglHandle window_buffer;
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gboolean dirty_bound_framebuffer;
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gboolean dirty_gl_viewport;
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/* Primitives */
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CoglPath *current_path;
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CoglPipeline *stencil_pipeline;
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/* Pre-generated VBOs containing indices to generate GL_TRIANGLES
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out of a vertex array of quads */
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CoglHandle quad_buffer_indices_byte;
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unsigned int quad_buffer_indices_len;
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CoglHandle quad_buffer_indices;
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CoglIndices *rectangle_byte_indices;
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CoglIndices *rectangle_short_indices;
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int rectangle_short_indices_len;
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gboolean in_begin_gl_block;
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CoglPipeline *texture_download_pipeline;
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CoglPipeline *blit_texture_pipeline;
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GSList *atlases;
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GHookList atlas_reorganize_callbacks;
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/* This debugging variable is used to pick a colour for visually
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displaying the quad batches. It needs to be global so that it can
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be reset by cogl_clear. It needs to be reset to increase the
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chances of getting the same colour during an animation */
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guint8 journal_rectangles_color;
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/* Cached values for GL_MAX_TEXTURE_[IMAGE_]UNITS to avoid calling
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glGetInteger too often */
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GLint max_texture_units;
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GLint max_texture_image_units;
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GLint max_activateable_texture_units;
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/* Fragment processing programs */
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CoglHandle current_program;
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CoglPipelineProgramType current_fragment_program_type;
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CoglPipelineProgramType current_vertex_program_type;
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GLuint current_gl_program;
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/* List of types that will be considered a subclass of CoglTexture in
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cogl_is_texture */
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GSList *texture_types;
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/* List of types that will be considered a subclass of CoglBuffer in
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cogl_is_buffer */
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GSList *buffer_types;
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/* Clipping */
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/* TRUE if we have a valid clipping stack flushed. In that case
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current_clip_stack will describe what the current state is. If
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this is FALSE then the current clip stack is completely unknown
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so it will need to be reflushed. In that case current_clip_stack
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doesn't need to be a valid pointer. We can't just use NULL in
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current_clip_stack to mark a dirty state because NULL is a valid
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stack (meaning no clipping) */
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gboolean current_clip_stack_valid;
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/* The clip state that was flushed. This isn't intended to be used
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as a stack to push and pop new entries. Instead the current stack
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that the user wants is part of the framebuffer state. This is
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just used to record the flush state so we can avoid flushing the
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same state multiple times. When the clip state is flushed this
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will hold a reference */
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CoglClipStack *current_clip_stack;
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/* Whether the stencil buffer was used as part of the current clip
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state. If TRUE then any further use of the stencil buffer (such
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as for drawing paths) would need to be merged with the existing
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stencil buffer */
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gboolean current_clip_stack_uses_stencil;
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/* This is used as a temporary buffer to fill a CoglBuffer when
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cogl_buffer_map fails and we only want to map to fill it with new
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data */
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GByteArray *buffer_map_fallback_array;
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gboolean buffer_map_fallback_in_use;
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CoglWinsysRectangleState rectangle_state;
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/* FIXME: remove these when we remove the last xlib based clutter
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* backend. they should be tracked as part of the renderer but e.g.
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* the eglx backend doesn't yet have a corresponding Cogl winsys
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* and so we wont have a renderer in that case. */
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#ifdef COGL_HAS_XLIB_SUPPORT
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int damage_base;
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/* List of callback functions that will be given every Xlib event */
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GSList *event_filters;
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/* Current top of the XError trap state stack. The actual memory for
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these is expected to be allocated on the stack by the caller */
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CoglXlibTrapState *trap_state;
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#endif
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unsigned int winsys_features
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[COGL_FLAGS_N_INTS_FOR_SIZE (COGL_WINSYS_FEATURE_N_FEATURES)];
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void *winsys;
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/* This defines a list of function pointers that Cogl uses from
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either GL or GLES. All functions are accessed indirectly through
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these pointers rather than linking to them directly */
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#ifndef APIENTRY
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#define APIENTRY
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#endif
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#define COGL_EXT_BEGIN(name, \
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min_gl_major, min_gl_minor, \
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gles_availability, \
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extension_suffixes, extension_names)
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#define COGL_EXT_FUNCTION(ret, name, args) \
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ret (APIENTRY * name) args;
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#define COGL_EXT_END()
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#include "cogl-ext-functions.h"
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#undef COGL_EXT_BEGIN
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#undef COGL_EXT_FUNCTION
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#undef COGL_EXT_END
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};
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CoglContext *
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_cogl_context_get_default ();
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const CoglWinsysVtable *
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_cogl_context_get_winsys (CoglContext *context);
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/* Check whether the current GL context is supported by Cogl */
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gboolean
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_cogl_context_check_gl_version (CoglContext *context,
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GError **error);
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/* Query the GL extensions and lookup the corresponding function
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* pointers. Theoretically the list of extensions can change for
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* different GL contexts so it is the winsys backend's responsiblity
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* to know when to re-query the GL extensions. */
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void
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_cogl_context_update_features (CoglContext *context);
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/* Obtains the context and returns retval if NULL */
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#define _COGL_GET_CONTEXT(ctxvar, retval) \
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CoglContext *ctxvar = _cogl_context_get_default (); \
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if (ctxvar == NULL) return retval;
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#define NO_RETVAL
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#endif /* __COGL_CONTEXT_PRIVATE_H */
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