75e6d734c1
So that we can dynamically select what winsys backend to use at runtime we need to have some indirection to how code accesses the winsys instead of simply calling _cogl_winsys* functions that would collide if we wanted to compile more than one backend into Cogl.
500 lines
16 KiB
C
500 lines
16 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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "cogl.h"
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#include "cogl-object.h"
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#include "cogl-internal.h"
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#include "cogl-private.h"
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#include "cogl-winsys-private.h"
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#include "cogl-profile.h"
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#include "cogl-util.h"
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#include "cogl-context-private.h"
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#include "cogl-display-private.h"
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#include "cogl-renderer-private.h"
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#include "cogl-journal-private.h"
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#include "cogl-texture-private.h"
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#include "cogl-pipeline-private.h"
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#include "cogl-pipeline-opengl-private.h"
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#include "cogl-framebuffer-private.h"
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#include "cogl2-path.h"
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#include <string.h>
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#ifdef HAVE_COGL_GL
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#include "cogl-pipeline-fragend-arbfp-private.h"
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#define glActiveTexture _context->drv.pf_glActiveTexture
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#endif
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/* This isn't defined in the GLES headers */
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#ifndef GL_POINT_SPRITE
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#define GL_POINT_SPRITE 0x8861
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#endif
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static void _cogl_context_free (CoglContext *context);
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COGL_OBJECT_DEFINE (Context, context);
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extern void
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_cogl_create_context_driver (CoglContext *context);
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static CoglContext *_context = NULL;
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static void
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_cogl_init_feature_overrides (CoglContext *ctx)
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{
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if (G_UNLIKELY (COGL_DEBUG_ENABLED (COGL_DEBUG_DISABLE_VBOS)))
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ctx->feature_flags &= ~COGL_FEATURE_VBOS;
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if (G_UNLIKELY (COGL_DEBUG_ENABLED (COGL_DEBUG_DISABLE_PBOS)))
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ctx->feature_flags &= ~COGL_FEATURE_PBOS;
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if (G_UNLIKELY (COGL_DEBUG_ENABLED (COGL_DEBUG_DISABLE_ARBFP)))
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ctx->feature_flags &= ~COGL_FEATURE_SHADERS_ARBFP;
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if (G_UNLIKELY (COGL_DEBUG_ENABLED (COGL_DEBUG_DISABLE_GLSL)))
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ctx->feature_flags &= ~COGL_FEATURE_SHADERS_GLSL;
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if (G_UNLIKELY (COGL_DEBUG_ENABLED (COGL_DEBUG_DISABLE_NPOT_TEXTURES)))
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ctx->feature_flags &= ~(COGL_FEATURE_TEXTURE_NPOT |
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COGL_FEATURE_TEXTURE_NPOT_BASIC |
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COGL_FEATURE_TEXTURE_NPOT_MIPMAP |
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COGL_FEATURE_TEXTURE_NPOT_REPEAT);
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}
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const CoglWinsysVtable *
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_cogl_context_get_winsys (CoglContext *context)
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{
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return context->display->renderer->winsys_vtable;
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}
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/* For reference: There was some deliberation over whether to have a
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* constructor that could throw an exception but looking at standard
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* practices with several high level OO languages including python, C++,
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* C# Java and Ruby they all support exceptions in constructors and the
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* general consensus appears to be that throwing an exception is neater
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* than successfully constructing with an internal error status that
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* would then have to be explicitly checked via some form of ::is_ok()
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* method.
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*/
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CoglContext *
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cogl_context_new (CoglDisplay *display,
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GError **error)
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{
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CoglContext *context;
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GLubyte default_texture_data[] = { 0xff, 0xff, 0xff, 0x0 };
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unsigned long enable_flags = 0;
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const CoglWinsysVtable *winsys;
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int i;
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#ifdef CLUTTER_ENABLE_PROFILE
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/* We need to be absolutely sure that uprof has been initialized
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* before calling _cogl_uprof_init. uprof_init (NULL, NULL)
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* will be a NOP if it has been initialized but it will also
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* mean subsequent parsing of the UProf GOptionGroup will have no
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* affect.
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*
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* Sadly GOptionGroup based library initialization is extremely
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* fragile by design because GOptionGroups have no notion of
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* dependencies and so the order things are initialized isn't
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* currently under tight control.
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*/
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uprof_init (NULL, NULL);
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_cogl_uprof_init ();
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#endif
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/* Allocate context memory */
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context = g_malloc (sizeof (CoglContext));
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/* XXX: Gross hack!
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* Currently everything in Cogl just assumes there is a default
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* context which it can access via _COGL_GET_CONTEXT() including
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* code used to construct a CoglContext. Until all of that code
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* has been updated to take an explicit context argument we have
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* to immediately make our pointer the default context.
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*/
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_context = context;
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/* Init default values */
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context->feature_flags = 0;
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context->texture_types = NULL;
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context->buffer_types = NULL;
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context->rectangle_state = COGL_WINSYS_RECTANGLE_STATE_UNKNOWN;
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memset (context->winsys_features, 0, sizeof (context->winsys_features));
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if (!display)
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display = cogl_display_new (NULL, NULL);
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else
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cogl_object_ref (display);
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if (!cogl_display_setup (display, error))
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{
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cogl_object_unref (display);
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g_free (context);
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return NULL;
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}
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context->display = display;
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#ifdef COGL_HAS_FULL_WINSYS
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context->stub_winsys = FALSE;
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winsys = _cogl_context_get_winsys (context);
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if (!winsys->context_init (context, error))
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{
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cogl_object_unref (display);
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g_free (context);
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return NULL;
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}
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#else
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/* In this case Clutter is still responsible for creating a GL
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* context. */
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context->stub_winsys = TRUE;
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if (!_cogl_gl_check_version (error))
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{
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g_free (context);
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return NULL;
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}
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_cogl_gl_update_features (context);
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#ifdef COGL_HAS_XLIB_SUPPORT
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_cogl_xlib_query_damage_extension ();
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#endif
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#endif
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/* Initialise the driver specific state */
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_cogl_init_feature_overrides (context);
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_cogl_pipeline_init_default_pipeline ();
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_cogl_pipeline_init_default_layers ();
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_cogl_pipeline_init_state_hash_functions ();
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_cogl_pipeline_init_layer_state_hash_functions ();
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context->enable_flags = 0;
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context->enable_backface_culling = FALSE;
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context->flushed_front_winding = COGL_FRONT_WINDING_COUNTER_CLOCKWISE;
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cogl_matrix_init_identity (&context->identity_matrix);
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cogl_matrix_init_identity (&context->y_flip_matrix);
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cogl_matrix_scale (&context->y_flip_matrix, 1, -1, 1);
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context->flushed_matrix_mode = COGL_MATRIX_MODELVIEW;
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context->texture_units =
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g_array_new (FALSE, FALSE, sizeof (CoglTextureUnit));
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/* See cogl-pipeline.c for more details about why we leave texture unit 1
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* active by default... */
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context->active_texture_unit = 1;
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GE (glActiveTexture (GL_TEXTURE1));
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context->legacy_fog_state.enabled = FALSE;
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context->opaque_color_pipeline = cogl_pipeline_new ();
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context->blended_color_pipeline = cogl_pipeline_new ();
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context->texture_pipeline = cogl_pipeline_new ();
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context->codegen_header_buffer = g_string_new ("");
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context->codegen_source_buffer = g_string_new ("");
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context->source_stack = NULL;
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context->legacy_state_set = 0;
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context->default_gl_texture_2d_tex = COGL_INVALID_HANDLE;
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context->default_gl_texture_rect_tex = COGL_INVALID_HANDLE;
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context->framebuffers = NULL;
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context->journal_flush_attributes_array =
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g_array_new (TRUE, FALSE, sizeof (CoglAttribute *));
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context->journal_clip_bounds = NULL;
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context->polygon_vertices = g_array_new (FALSE, FALSE, sizeof (float));
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context->current_pipeline = NULL;
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context->current_pipeline_changes_since_flush = 0;
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context->current_pipeline_skip_gl_color = FALSE;
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context->pipeline0_nodes =
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g_array_sized_new (FALSE, FALSE, sizeof (CoglHandle), 20);
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context->pipeline1_nodes =
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g_array_sized_new (FALSE, FALSE, sizeof (CoglHandle), 20);
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_cogl_bitmask_init (&context->arrays_enabled);
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_cogl_bitmask_init (&context->temp_bitmask);
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_cogl_bitmask_init (&context->arrays_to_change);
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context->max_texture_units = -1;
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context->max_texture_image_units = -1;
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context->max_activateable_texture_units = -1;
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context->current_program = COGL_INVALID_HANDLE;
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context->current_fragment_program_type = COGL_PIPELINE_PROGRAM_TYPE_FIXED;
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context->current_vertex_program_type = COGL_PIPELINE_PROGRAM_TYPE_FIXED;
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context->current_gl_program = 0;
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context->gl_blend_enable_cache = FALSE;
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context->depth_test_enabled_cache = FALSE;
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context->depth_test_function_cache = COGL_DEPTH_TEST_FUNCTION_LESS;
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context->depth_writing_enabled_cache = TRUE;
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context->depth_range_near_cache = 0;
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context->depth_range_far_cache = 1;
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context->point_size_cache = 1.0f;
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context->legacy_depth_test_enabled = FALSE;
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#ifdef HAVE_COGL_GL
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_context->arbfp_cache = g_hash_table_new (_cogl_pipeline_fragend_arbfp_hash,
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_cogl_pipeline_fragend_arbfp_equal);
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#endif
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for (i = 0; i < COGL_BUFFER_BIND_TARGET_COUNT; i++)
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context->current_buffer[i] = NULL;
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context->framebuffer_stack = _cogl_create_framebuffer_stack ();
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/* XXX: In this case the Clutter backend is still responsible for
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* the OpenGL binding API and for creating onscreen framebuffers and
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* so we have to add a dummy framebuffer to represent the backend
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* owned window... */
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if (context->stub_winsys)
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{
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CoglOnscreen *window = _cogl_onscreen_new ();
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cogl_set_framebuffer (COGL_FRAMEBUFFER (window));
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cogl_object_unref (COGL_FRAMEBUFFER (window));
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}
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_context->current_clip_stack_valid = FALSE;
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context->dirty_bound_framebuffer = TRUE;
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context->dirty_gl_viewport = TRUE;
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context->current_path = cogl2_path_new ();
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context->stencil_pipeline = cogl_pipeline_new ();
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context->in_begin_gl_block = FALSE;
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context->quad_buffer_indices_byte = COGL_INVALID_HANDLE;
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context->quad_buffer_indices = COGL_INVALID_HANDLE;
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context->quad_buffer_indices_len = 0;
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context->rectangle_byte_indices = NULL;
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context->rectangle_short_indices = NULL;
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context->rectangle_short_indices_len = 0;
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context->texture_download_pipeline = COGL_INVALID_HANDLE;
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context->blit_texture_pipeline = COGL_INVALID_HANDLE;
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#ifndef HAVE_COGL_GLES2
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/* The default for GL_ALPHA_TEST is to always pass which is equivalent to
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* the test being disabled therefore we assume that for all drivers there
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* will be no performance impact if we always leave the test enabled which
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* makes things a bit simpler for us. Under GLES2 the alpha test is
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* implemented in the fragment shader so there is no enable for it
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*/
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GE (glEnable (GL_ALPHA_TEST));
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#endif
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#ifdef HAVE_COGL_GLES2
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_context->flushed_modelview_stack = NULL;
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_context->flushed_projection_stack = NULL;
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#endif
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/* Create default textures used for fall backs */
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context->default_gl_texture_2d_tex =
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cogl_texture_new_from_data (1, /* width */
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1, /* height */
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COGL_TEXTURE_NO_SLICING,
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COGL_PIXEL_FORMAT_RGBA_8888_PRE, /* data format */
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/* internal format */
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COGL_PIXEL_FORMAT_RGBA_8888_PRE,
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0, /* auto calc row stride */
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default_texture_data);
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context->default_gl_texture_rect_tex =
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cogl_texture_new_from_data (1, /* width */
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1, /* height */
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COGL_TEXTURE_NO_SLICING,
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COGL_PIXEL_FORMAT_RGBA_8888_PRE, /* data format */
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/* internal format */
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COGL_PIXEL_FORMAT_RGBA_8888_PRE,
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0, /* auto calc row stride */
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default_texture_data);
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cogl_push_source (context->opaque_color_pipeline);
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_cogl_pipeline_flush_gl_state (context->opaque_color_pipeline, FALSE, 0);
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_cogl_enable (enable_flags);
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_cogl_flush_face_winding ();
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context->atlases = NULL;
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_context->buffer_map_fallback_array = g_byte_array_new ();
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_context->buffer_map_fallback_in_use = FALSE;
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/* As far as I can tell, GL_POINT_SPRITE doesn't have any effect
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unless GL_COORD_REPLACE is enabled for an individual
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layer. Therefore it seems like it should be ok to just leave it
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enabled all the time instead of having to have a set property on
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each pipeline to track whether any layers have point sprite
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coords enabled. We don't need to do this for GLES2 because point
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sprites are handled using a builtin varying in the shader. */
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#ifndef HAVE_COGL_GLES2
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if (cogl_features_available (COGL_FEATURE_POINT_SPRITE))
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GE (glEnable (GL_POINT_SPRITE));
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#endif
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return _cogl_context_object_new (context);
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}
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static void
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_cogl_context_free (CoglContext *context)
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{
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const CoglWinsysVtable *winsys = _cogl_context_get_winsys (context);
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winsys->context_deinit (context);
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_cogl_destroy_texture_units ();
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_cogl_free_framebuffer_stack (context->framebuffer_stack);
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if (context->current_path)
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cogl_handle_unref (context->current_path);
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if (context->default_gl_texture_2d_tex)
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cogl_handle_unref (context->default_gl_texture_2d_tex);
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if (context->default_gl_texture_rect_tex)
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cogl_handle_unref (context->default_gl_texture_rect_tex);
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if (context->opaque_color_pipeline)
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cogl_handle_unref (context->opaque_color_pipeline);
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if (context->blended_color_pipeline)
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cogl_handle_unref (context->blended_color_pipeline);
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if (context->texture_pipeline)
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cogl_handle_unref (context->texture_pipeline);
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if (context->blit_texture_pipeline)
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cogl_handle_unref (context->blit_texture_pipeline);
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if (context->journal_flush_attributes_array)
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g_array_free (context->journal_flush_attributes_array, TRUE);
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if (context->journal_clip_bounds)
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g_array_free (context->journal_clip_bounds, TRUE);
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if (context->polygon_vertices)
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g_array_free (context->polygon_vertices, TRUE);
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if (context->quad_buffer_indices_byte)
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cogl_handle_unref (context->quad_buffer_indices_byte);
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if (context->quad_buffer_indices)
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cogl_handle_unref (context->quad_buffer_indices);
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if (context->rectangle_byte_indices)
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cogl_object_unref (context->rectangle_byte_indices);
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if (context->rectangle_short_indices)
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cogl_object_unref (context->rectangle_short_indices);
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if (context->default_pipeline)
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cogl_handle_unref (context->default_pipeline);
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if (context->dummy_layer_dependant)
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cogl_handle_unref (context->dummy_layer_dependant);
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if (context->default_layer_n)
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cogl_handle_unref (context->default_layer_n);
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if (context->default_layer_0)
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cogl_handle_unref (context->default_layer_0);
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if (context->current_clip_stack_valid)
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_cogl_clip_stack_unref (context->current_clip_stack);
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g_slist_free (context->atlases);
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_cogl_bitmask_destroy (&context->arrays_enabled);
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_cogl_bitmask_destroy (&context->temp_bitmask);
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_cogl_bitmask_destroy (&context->arrays_to_change);
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g_slist_free (context->texture_types);
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g_slist_free (context->buffer_types);
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#ifdef HAVE_COGL_GLES2
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if (_context->flushed_modelview_stack)
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cogl_object_unref (_context->flushed_modelview_stack);
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if (_context->flushed_projection_stack)
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cogl_object_unref (_context->flushed_projection_stack);
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#endif
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#ifdef HAVE_COGL_GL
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g_hash_table_unref (context->arbfp_cache);
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#endif
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g_byte_array_free (context->buffer_map_fallback_array, TRUE);
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cogl_object_unref (context->display);
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g_free (context);
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}
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CoglContext *
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_cogl_context_get_default (void)
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{
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GError *error = NULL;
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/* Create if doesn't exist yet */
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if (_context == NULL)
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{
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_context = cogl_context_new (NULL, &error);
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if (!_context)
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{
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g_warning ("Failed to create default context: %s",
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error->message);
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g_error_free (error);
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}
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}
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return _context;
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}
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void
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cogl_set_default_context (CoglContext *context)
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{
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cogl_object_ref (context);
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if (_context)
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cogl_object_unref (_context);
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_context = context;
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}
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#ifdef COGL_HAS_EGL_SUPPORT
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EGLDisplay
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cogl_context_egl_get_egl_display (CoglContext *context)
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{
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const CoglWinsysVtable *winsys = _cogl_context_get_winsys (context);
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return winsys->context_egl_get_egl_display (context);
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}
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#endif
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