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mutter/cogl/cogl-context.c
Neil Roberts b2e735ff7f Dynamically load the GL or GLES library 
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
2011-07-11 12:57:38 +01:00

558 lines
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/*
* 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/>.
*
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "cogl.h"
#include "cogl-object.h"
#include "cogl-internal.h"
#include "cogl-private.h"
#include "cogl-winsys-private.h"
#include "winsys/cogl-winsys-stub-private.h"
#include "cogl-profile.h"
#include "cogl-util.h"
#include "cogl-context-private.h"
#include "cogl-display-private.h"
#include "cogl-renderer-private.h"
#include "cogl-journal-private.h"
#include "cogl-texture-private.h"
#include "cogl-pipeline-private.h"
#include "cogl-pipeline-opengl-private.h"
#include "cogl-framebuffer-private.h"
#include "cogl2-path.h"
#include <string.h>
#ifdef HAVE_COGL_GL
#include "cogl-pipeline-fragend-arbfp-private.h"
#endif
/* This isn't defined in the GLES headers */
#ifndef GL_POINT_SPRITE
#define GL_POINT_SPRITE 0x8861
#endif
#ifdef HAVE_COGL_GL
extern const CoglTextureDriver _cogl_texture_driver_gl;
#endif
#if defined (HAVE_COGL_GLES) || defined (HAVE_COGL_GLES2)
extern const CoglTextureDriver _cogl_texture_driver_gles;
#endif
static void _cogl_context_free (CoglContext *context);
COGL_OBJECT_DEFINE (Context, context);
extern void
_cogl_create_context_driver (CoglContext *context);
static CoglContext *_context = NULL;
static void
_cogl_init_feature_overrides (CoglContext *ctx)
{
if (G_UNLIKELY (COGL_DEBUG_ENABLED (COGL_DEBUG_DISABLE_VBOS)))
ctx->feature_flags &= ~COGL_FEATURE_VBOS;
if (G_UNLIKELY (COGL_DEBUG_ENABLED (COGL_DEBUG_DISABLE_PBOS)))
ctx->feature_flags &= ~COGL_FEATURE_PBOS;
if (G_UNLIKELY (COGL_DEBUG_ENABLED (COGL_DEBUG_DISABLE_ARBFP)))
ctx->feature_flags &= ~COGL_FEATURE_SHADERS_ARBFP;
if (G_UNLIKELY (COGL_DEBUG_ENABLED (COGL_DEBUG_DISABLE_GLSL)))
ctx->feature_flags &= ~COGL_FEATURE_SHADERS_GLSL;
if (G_UNLIKELY (COGL_DEBUG_ENABLED (COGL_DEBUG_DISABLE_NPOT_TEXTURES)))
ctx->feature_flags &= ~(COGL_FEATURE_TEXTURE_NPOT |
COGL_FEATURE_TEXTURE_NPOT_BASIC |
COGL_FEATURE_TEXTURE_NPOT_MIPMAP |
COGL_FEATURE_TEXTURE_NPOT_REPEAT);
}
const CoglWinsysVtable *
_cogl_context_get_winsys (CoglContext *context)
{
return context->display->renderer->winsys_vtable;
}
/* For reference: There was some deliberation over whether to have a
* constructor that could throw an exception but looking at standard
* practices with several high level OO languages including python, C++,
* C# Java and Ruby they all support exceptions in constructors and the
* general consensus appears to be that throwing an exception is neater
* than successfully constructing with an internal error status that
* would then have to be explicitly checked via some form of ::is_ok()
* method.
*/
CoglContext *
cogl_context_new (CoglDisplay *display,
GError **error)
{
CoglContext *context;
GLubyte default_texture_data[] = { 0xff, 0xff, 0xff, 0x0 };
unsigned long enable_flags = 0;
const CoglWinsysVtable *winsys;
int i;
_cogl_init ();
#ifdef COGL_ENABLE_PROFILE
/* We need to be absolutely sure that uprof has been initialized
* before calling _cogl_uprof_init. uprof_init (NULL, NULL)
* will be a NOP if it has been initialized but it will also
* mean subsequent parsing of the UProf GOptionGroup will have no
* affect.
*
* Sadly GOptionGroup based library initialization is extremely
* fragile by design because GOptionGroups have no notion of
* dependencies and so the order things are initialized isn't
* currently under tight control.
*/
uprof_init (NULL, NULL);
_cogl_uprof_init ();
#endif
/* Allocate context memory */
context = g_malloc (sizeof (CoglContext));
/* XXX: Gross hack!
* Currently everything in Cogl just assumes there is a default
* context which it can access via _COGL_GET_CONTEXT() including
* code used to construct a CoglContext. Until all of that code
* has been updated to take an explicit context argument we have
* to immediately make our pointer the default context.
*/
_context = context;
/* Init default values */
context->feature_flags = 0;
context->private_feature_flags = 0;
context->texture_types = NULL;
context->buffer_types = NULL;
context->rectangle_state = COGL_WINSYS_RECTANGLE_STATE_UNKNOWN;
memset (context->winsys_features, 0, sizeof (context->winsys_features));
if (!display)
display = cogl_display_new (NULL, NULL);
else
cogl_object_ref (display);
if (!cogl_display_setup (display, error))
{
cogl_object_unref (display);
g_free (context);
return NULL;
}
context->display = display;
/* This is duplicated data, but it's much more convenient to have
the driver attached to the context and the value is accessed a
lot throughout Cogl */
context->driver = display->renderer->driver;
winsys = _cogl_context_get_winsys (context);
if (!winsys->context_init (context, error))
{
cogl_object_unref (display);
g_free (context);
return NULL;
}
switch (context->driver)
{
#ifdef HAVE_COGL_GL
case COGL_DRIVER_GL:
context->texture_driver = &_cogl_texture_driver_gl;
break;
#endif
#if defined (HAVE_COGL_GLES) || defined (HAVE_COGL_GLES2)
case COGL_DRIVER_GLES1:
case COGL_DRIVER_GLES2:
context->texture_driver = &_cogl_texture_driver_gles;
break;
#endif
default:
g_assert_not_reached ();
}
/* Initialise the driver specific state */
_cogl_init_feature_overrides (context);
_cogl_pipeline_init_default_pipeline ();
_cogl_pipeline_init_default_layers ();
_cogl_pipeline_init_state_hash_functions ();
_cogl_pipeline_init_layer_state_hash_functions ();
context->enable_flags = 0;
context->enable_backface_culling = FALSE;
context->flushed_front_winding = COGL_FRONT_WINDING_COUNTER_CLOCKWISE;
cogl_matrix_init_identity (&context->identity_matrix);
cogl_matrix_init_identity (&context->y_flip_matrix);
cogl_matrix_scale (&context->y_flip_matrix, 1, -1, 1);
context->flushed_matrix_mode = COGL_MATRIX_MODELVIEW;
context->texture_units =
g_array_new (FALSE, FALSE, sizeof (CoglTextureUnit));
/* See cogl-pipeline.c for more details about why we leave texture unit 1
* active by default... */
context->active_texture_unit = 1;
GE (context, glActiveTexture (GL_TEXTURE1));
context->legacy_fog_state.enabled = FALSE;
context->opaque_color_pipeline = cogl_pipeline_new ();
context->blended_color_pipeline = cogl_pipeline_new ();
context->texture_pipeline = cogl_pipeline_new ();
context->codegen_header_buffer = g_string_new ("");
context->codegen_source_buffer = g_string_new ("");
context->source_stack = NULL;
context->legacy_state_set = 0;
context->default_gl_texture_2d_tex = COGL_INVALID_HANDLE;
context->default_gl_texture_rect_tex = COGL_INVALID_HANDLE;
context->framebuffers = NULL;
context->journal_flush_attributes_array =
g_array_new (TRUE, FALSE, sizeof (CoglAttribute *));
context->journal_clip_bounds = NULL;
context->polygon_vertices = g_array_new (FALSE, FALSE, sizeof (float));
context->current_pipeline = NULL;
context->current_pipeline_changes_since_flush = 0;
context->current_pipeline_skip_gl_color = FALSE;
context->pipeline0_nodes =
g_array_sized_new (FALSE, FALSE, sizeof (CoglHandle), 20);
context->pipeline1_nodes =
g_array_sized_new (FALSE, FALSE, sizeof (CoglHandle), 20);
_cogl_bitmask_init (&context->arrays_enabled);
_cogl_bitmask_init (&context->temp_bitmask);
_cogl_bitmask_init (&context->arrays_to_change);
context->max_texture_units = -1;
context->max_texture_image_units = -1;
context->max_activateable_texture_units = -1;
context->current_program = COGL_INVALID_HANDLE;
context->current_fragment_program_type = COGL_PIPELINE_PROGRAM_TYPE_FIXED;
context->current_vertex_program_type = COGL_PIPELINE_PROGRAM_TYPE_FIXED;
context->current_gl_program = 0;
context->gl_blend_enable_cache = FALSE;
context->depth_test_enabled_cache = FALSE;
context->depth_test_function_cache = COGL_DEPTH_TEST_FUNCTION_LESS;
context->depth_writing_enabled_cache = TRUE;
context->depth_range_near_cache = 0;
context->depth_range_far_cache = 1;
context->point_size_cache = 1.0f;
context->legacy_depth_test_enabled = FALSE;
#ifdef HAVE_COGL_GL
_context->arbfp_cache = g_hash_table_new (_cogl_pipeline_fragend_arbfp_hash,
_cogl_pipeline_fragend_arbfp_equal);
#endif
for (i = 0; i < COGL_BUFFER_BIND_TARGET_COUNT; i++)
context->current_buffer[i] = NULL;
context->framebuffer_stack = _cogl_create_framebuffer_stack ();
/* XXX: In this case the Clutter backend is still responsible for
* the OpenGL binding API and for creating onscreen framebuffers and
* so we have to add a dummy framebuffer to represent the backend
* owned window... */
if (_cogl_context_get_winsys (context) == _cogl_winsys_stub_get_vtable ())
{
CoglOnscreen *window = _cogl_onscreen_new ();
cogl_set_framebuffer (COGL_FRAMEBUFFER (window));
cogl_object_unref (COGL_FRAMEBUFFER (window));
}
_context->current_clip_stack_valid = FALSE;
context->dirty_bound_framebuffer = TRUE;
context->dirty_gl_viewport = TRUE;
context->current_path = cogl2_path_new ();
context->stencil_pipeline = cogl_pipeline_new ();
context->in_begin_gl_block = FALSE;
context->quad_buffer_indices_byte = COGL_INVALID_HANDLE;
context->quad_buffer_indices = COGL_INVALID_HANDLE;
context->quad_buffer_indices_len = 0;
context->rectangle_byte_indices = NULL;
context->rectangle_short_indices = NULL;
context->rectangle_short_indices_len = 0;
context->texture_download_pipeline = COGL_INVALID_HANDLE;
context->blit_texture_pipeline = COGL_INVALID_HANDLE;
#if defined (HAVE_COGL_GL) || defined (HAVE_COGL_GLES)
if (context->driver != COGL_DRIVER_GLES2)
/* The default for GL_ALPHA_TEST is to always pass which is equivalent to
* the test being disabled therefore we assume that for all drivers there
* will be no performance impact if we always leave the test enabled which
* makes things a bit simpler for us. Under GLES2 the alpha test is
* implemented in the fragment shader so there is no enable for it
*/
GE (context, glEnable (GL_ALPHA_TEST));
#endif
#ifdef HAVE_COGL_GLES2
_context->flushed_modelview_stack = NULL;
_context->flushed_projection_stack = NULL;
#endif
/* Create default textures used for fall backs */
context->default_gl_texture_2d_tex =
cogl_texture_new_from_data (1, /* width */
1, /* height */
COGL_TEXTURE_NO_SLICING,
COGL_PIXEL_FORMAT_RGBA_8888_PRE, /* data format */
/* internal format */
COGL_PIXEL_FORMAT_RGBA_8888_PRE,
0, /* auto calc row stride */
default_texture_data);
context->default_gl_texture_rect_tex =
cogl_texture_new_from_data (1, /* width */
1, /* height */
COGL_TEXTURE_NO_SLICING,
COGL_PIXEL_FORMAT_RGBA_8888_PRE, /* data format */
/* internal format */
COGL_PIXEL_FORMAT_RGBA_8888_PRE,
0, /* auto calc row stride */
default_texture_data);
cogl_push_source (context->opaque_color_pipeline);
_cogl_pipeline_flush_gl_state (context->opaque_color_pipeline, FALSE, 0);
_cogl_enable (enable_flags);
_cogl_flush_face_winding ();
context->atlases = NULL;
g_hook_list_init (&context->atlas_reorganize_callbacks, sizeof (GHook));
_context->buffer_map_fallback_array = g_byte_array_new ();
_context->buffer_map_fallback_in_use = FALSE;
/* As far as I can tell, GL_POINT_SPRITE doesn't have any effect
unless GL_COORD_REPLACE is enabled for an individual
layer. Therefore it seems like it should be ok to just leave it
enabled all the time instead of having to have a set property on
each pipeline to track whether any layers have point sprite
coords enabled. We don't need to do this for GLES2 because point
sprites are handled using a builtin varying in the shader. */
if (_context->driver != COGL_DRIVER_GLES2 &&
cogl_features_available (COGL_FEATURE_POINT_SPRITE))
GE (context, glEnable (GL_POINT_SPRITE));
return _cogl_context_object_new (context);
}
static void
_cogl_context_free (CoglContext *context)
{
const CoglWinsysVtable *winsys = _cogl_context_get_winsys (context);
winsys->context_deinit (context);
_cogl_destroy_texture_units ();
_cogl_free_framebuffer_stack (context->framebuffer_stack);
if (context->current_path)
cogl_handle_unref (context->current_path);
if (context->default_gl_texture_2d_tex)
cogl_handle_unref (context->default_gl_texture_2d_tex);
if (context->default_gl_texture_rect_tex)
cogl_handle_unref (context->default_gl_texture_rect_tex);
if (context->opaque_color_pipeline)
cogl_handle_unref (context->opaque_color_pipeline);
if (context->blended_color_pipeline)
cogl_handle_unref (context->blended_color_pipeline);
if (context->texture_pipeline)
cogl_handle_unref (context->texture_pipeline);
if (context->blit_texture_pipeline)
cogl_handle_unref (context->blit_texture_pipeline);
if (context->journal_flush_attributes_array)
g_array_free (context->journal_flush_attributes_array, TRUE);
if (context->journal_clip_bounds)
g_array_free (context->journal_clip_bounds, TRUE);
if (context->polygon_vertices)
g_array_free (context->polygon_vertices, TRUE);
if (context->quad_buffer_indices_byte)
cogl_handle_unref (context->quad_buffer_indices_byte);
if (context->quad_buffer_indices)
cogl_handle_unref (context->quad_buffer_indices);
if (context->rectangle_byte_indices)
cogl_object_unref (context->rectangle_byte_indices);
if (context->rectangle_short_indices)
cogl_object_unref (context->rectangle_short_indices);
if (context->default_pipeline)
cogl_handle_unref (context->default_pipeline);
if (context->dummy_layer_dependant)
cogl_handle_unref (context->dummy_layer_dependant);
if (context->default_layer_n)
cogl_handle_unref (context->default_layer_n);
if (context->default_layer_0)
cogl_handle_unref (context->default_layer_0);
if (context->current_clip_stack_valid)
_cogl_clip_stack_unref (context->current_clip_stack);
g_slist_free (context->atlases);
g_hook_list_clear (&context->atlas_reorganize_callbacks);
_cogl_bitmask_destroy (&context->arrays_enabled);
_cogl_bitmask_destroy (&context->temp_bitmask);
_cogl_bitmask_destroy (&context->arrays_to_change);
g_slist_free (context->texture_types);
g_slist_free (context->buffer_types);
#ifdef HAVE_COGL_GLES2
if (_context->flushed_modelview_stack)
cogl_object_unref (_context->flushed_modelview_stack);
if (_context->flushed_projection_stack)
cogl_object_unref (_context->flushed_projection_stack);
#endif
#ifdef HAVE_COGL_GL
g_hash_table_unref (context->arbfp_cache);
#endif
g_byte_array_free (context->buffer_map_fallback_array, TRUE);
cogl_object_unref (context->display);
g_free (context);
}
CoglContext *
_cogl_context_get_default (void)
{
GError *error = NULL;
/* Create if doesn't exist yet */
if (_context == NULL)
{
_context = cogl_context_new (NULL, &error);
if (!_context)
{
g_warning ("Failed to create default context: %s",
error->message);
g_error_free (error);
}
}
return _context;
}
void
cogl_set_default_context (CoglContext *context)
{
cogl_object_ref (context);
if (_context)
cogl_object_unref (_context);
_context = context;
}
#ifdef COGL_HAS_EGL_SUPPORT
EGLDisplay
cogl_context_egl_get_egl_display (CoglContext *context)
{
const CoglWinsysVtable *winsys = _cogl_context_get_winsys (context);
/* This should only be called for EGL contexts */
g_return_val_if_fail (winsys->context_egl_get_egl_display != NULL, NULL);
return winsys->context_egl_get_egl_display (context);
}
#endif
gboolean
_cogl_context_check_gl_version (CoglContext *context,
GError **error)
{
#ifdef HAVE_COGL_GL
if (context->driver == COGL_DRIVER_GL)
return _cogl_gl_check_gl_version (context, error);
#endif
#if defined(HAVE_COGL_GLES) || defined(HAVE_COGL_GLES2)
return _cogl_gles_check_gl_version (context, error);
#endif
g_assert_not_reached ();
}
void
_cogl_context_update_features (CoglContext *context)
{
#ifdef HAVE_COGL_GL
if (context->driver == COGL_DRIVER_GL)
{
_cogl_gl_update_features (context);
return;
}
#endif
#if defined(HAVE_COGL_GLES) || defined(HAVE_COGL_GLES2)
_cogl_gles_update_features (context);
return;
#endif
g_assert_not_reached ();
}
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