b4bc9eb458
Although we wouldn't recommend developers try and interleve OpenGL drawing with Cogl drawing - we would prefer patches that improve Cogl to avoid this if possible - we are providing a simple mechanism that will at least give developers a fighting chance if they find it necissary. Note: we aren't helping developers change OpenGL state to modify the behaviour of Cogl drawing functions - it's unlikley that can ever be reliably supported - but if they are trying to do something like: - setup some OpenGL state. - draw using OpenGL (e.g. glDrawArrays() ) - reset modified OpenGL state. - continue using Cogl to draw They should surround their blocks of raw OpenGL with cogl_begin_gl() and cogl_end_gl(): cogl_begin_gl (); - setup some OpenGL state. - draw using OpenGL (e.g. glDrawArrays() ) - reset modified OpenGL state. cogl_end_gl (); - continue using Cogl to draw Again; we aren't supporting code like this: - setup some OpenGL state. - use Cogl to draw - reset modified OpenGL state. When the internals of Cogl evolves, this is very liable to break. cogl_begin_gl() will flush all internally batched Cogl primitives, and emit all internal Cogl state to OpenGL as if it were going to draw something itself. The result is that the OpenGL modelview matrix will be setup; the state corresponding to the current source material will be setup and other world state such as backface culling, depth and fogging enabledness will be also be sent to OpenGL. Note: no special material state is flushed, so if developers want Cogl to setup a simplified material state it is the their responsibility to set a simple source material before calling cogl_begin_gl. E.g. by calling cogl_set_source_color4ub(). Note: It is the developers responsibility to restore any OpenGL state that they modify to how it was after calling cogl_begin_gl() if they don't do this then the result of further Cogl calls is undefined.
849 lines
21 KiB
C
849 lines
21 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, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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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 <string.h>
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#include <math.h>
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#include <stdlib.h>
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#ifdef HAVE_CLUTTER_GLX
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#include <dlfcn.h>
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#include <GL/glx.h>
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typedef CoglFuncPtr (*GLXGetProcAddressProc) (const guint8 *procName);
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#endif
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#include "cogl-debug.h"
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#include "cogl-internal.h"
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#include "cogl-util.h"
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#include "cogl-context.h"
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#include "cogl-material-private.h"
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#if defined (HAVE_COGL_GLES2) || defined (HAVE_COGL_GLES)
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#include "cogl-gles2-wrapper.h"
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#endif
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#ifdef COGL_GL_DEBUG
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/* GL error to string conversion */
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static const struct {
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GLuint error_code;
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const gchar *error_string;
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} gl_errors[] = {
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{ GL_NO_ERROR, "No error" },
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{ GL_INVALID_ENUM, "Invalid enumeration value" },
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{ GL_INVALID_VALUE, "Invalid value" },
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{ GL_INVALID_OPERATION, "Invalid operation" },
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{ GL_STACK_OVERFLOW, "Stack overflow" },
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{ GL_STACK_UNDERFLOW, "Stack underflow" },
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{ GL_OUT_OF_MEMORY, "Out of memory" },
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#ifdef GL_INVALID_FRAMEBUFFER_OPERATION_EXT
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{ GL_INVALID_FRAMEBUFFER_OPERATION_EXT, "Invalid framebuffer operation" }
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#endif
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};
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static const guint n_gl_errors = G_N_ELEMENTS (gl_errors);
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const gchar *
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cogl_gl_error_to_string (GLenum error_code)
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{
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gint i;
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for (i = 0; i < n_gl_errors; i++)
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{
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if (gl_errors[i].error_code == error_code)
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return gl_errors[i].error_string;
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}
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return "Unknown GL error";
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}
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#endif /* COGL_GL_DEBUG */
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void
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cogl_clear (const CoglColor *color, gulong buffers)
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{
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GLbitfield gl_buffers = 0;
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COGL_NOTE (DRAW, "Clear begin");
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cogl_clip_ensure ();
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if (buffers & COGL_BUFFER_BIT_COLOR)
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{
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GE( glClearColor (cogl_color_get_red_float (color),
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cogl_color_get_green_float (color),
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cogl_color_get_blue_float (color),
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0.0) );
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gl_buffers |= GL_COLOR_BUFFER_BIT;
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}
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if (buffers & COGL_BUFFER_BIT_DEPTH)
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gl_buffers |= GL_DEPTH_BUFFER_BIT;
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if (buffers & COGL_BUFFER_BIT_STENCIL)
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gl_buffers |= GL_STENCIL_BUFFER_BIT;
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if (!gl_buffers)
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{
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static gboolean shown = FALSE;
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if (!shown)
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{
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g_warning ("You should specify at least one auxiliary buffer "
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"when calling cogl_clear");
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}
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return;
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}
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glClear (gl_buffers);
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COGL_NOTE (DRAW, "Clear end");
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}
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static inline gboolean
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cogl_toggle_flag (CoglContext *ctx,
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gulong new_flags,
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gulong flag,
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GLenum gl_flag)
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{
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/* Toggles and caches a single enable flag on or off
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* by comparing to current state
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*/
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if (new_flags & flag)
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{
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if (!(ctx->enable_flags & flag))
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{
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GE( glEnable (gl_flag) );
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ctx->enable_flags |= flag;
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return TRUE;
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}
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}
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else if (ctx->enable_flags & flag)
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{
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GE( glDisable (gl_flag) );
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ctx->enable_flags &= ~flag;
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}
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return FALSE;
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}
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static inline gboolean
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cogl_toggle_client_flag (CoglContext *ctx,
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gulong new_flags,
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gulong flag,
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GLenum gl_flag)
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{
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/* Toggles and caches a single client-side enable flag
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* on or off by comparing to current state
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*/
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if (new_flags & flag)
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{
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if (!(ctx->enable_flags & flag))
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{
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GE( glEnableClientState (gl_flag) );
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ctx->enable_flags |= flag;
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return TRUE;
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}
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}
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else if (ctx->enable_flags & flag)
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{
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GE( glDisableClientState (gl_flag) );
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ctx->enable_flags &= ~flag;
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}
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return FALSE;
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}
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void
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cogl_enable (gulong flags)
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{
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/* This function essentially caches glEnable state() in the
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* hope of lessening number GL traffic.
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*/
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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cogl_toggle_flag (ctx, flags,
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COGL_ENABLE_BLEND,
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GL_BLEND);
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cogl_toggle_flag (ctx, flags,
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COGL_ENABLE_BACKFACE_CULLING,
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GL_CULL_FACE);
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cogl_toggle_client_flag (ctx, flags,
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COGL_ENABLE_VERTEX_ARRAY,
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GL_VERTEX_ARRAY);
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cogl_toggle_client_flag (ctx, flags,
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COGL_ENABLE_COLOR_ARRAY,
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GL_COLOR_ARRAY);
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}
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gulong
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cogl_get_enable ()
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{
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_COGL_GET_CONTEXT (ctx, 0);
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return ctx->enable_flags;
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}
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void
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cogl_set_depth_test_enabled (gboolean setting)
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{
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/* Currently the journal can't track changes to depth state... */
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_cogl_journal_flush ();
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if (setting)
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{
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glEnable (GL_DEPTH_TEST);
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glDepthFunc (GL_LEQUAL);
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}
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else
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glDisable (GL_DEPTH_TEST);
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}
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gboolean
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cogl_get_depth_test_enabled (void)
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{
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return glIsEnabled (GL_DEPTH_TEST) == GL_TRUE ? TRUE : FALSE;
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}
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void
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cogl_set_backface_culling_enabled (gboolean setting)
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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/* Currently the journal can't track changes to backface culling state... */
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_cogl_journal_flush ();
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ctx->enable_backface_culling = setting;
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}
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gboolean
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cogl_get_backface_culling_enabled (void)
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{
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_COGL_GET_CONTEXT (ctx, FALSE);
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return ctx->enable_backface_culling;
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}
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void
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cogl_set_source_color (const CoglColor *color)
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{
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CoglColor premultiplied;
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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/* In case cogl_set_source_texture was previously used... */
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cogl_material_remove_layer (ctx->default_material, 0);
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premultiplied = *color;
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cogl_color_premultiply (&premultiplied);
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cogl_material_set_color (ctx->default_material, &premultiplied);
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cogl_set_source (ctx->default_material);
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}
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static void
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project_vertex (const CoglMatrix *modelview_matrix,
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const CoglMatrix *projection_matrix,
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float *vertex)
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{
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int i;
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/* Apply the modelview matrix */
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cogl_matrix_transform_point (modelview_matrix,
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&vertex[0], &vertex[1],
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&vertex[2], &vertex[3]);
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/* Apply the projection matrix */
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cogl_matrix_transform_point (projection_matrix,
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&vertex[0], &vertex[1],
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&vertex[2], &vertex[3]);
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/* Convert from homogenized coordinates */
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for (i = 0; i < 4; i++)
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vertex[i] /= vertex[3];
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}
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static void
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set_clip_plane (GLint plane_num,
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const float *vertex_a,
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const float *vertex_b)
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{
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#if defined (HAVE_COGL_GLES2) || defined (HAVE_COGL_GLES)
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GLfloat plane[4];
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#else
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GLdouble plane[4];
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#endif
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GLfloat angle;
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CoglMatrix inverse_projection;
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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/* Calculate the angle between the axes and the line crossing the
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two points */
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angle = atan2f (vertex_b[1] - vertex_a[1],
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vertex_b[0] - vertex_a[0]) * (180.0/G_PI);
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_cogl_current_matrix_push ();
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/* Load the identity matrix and multiply by the reverse of the
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projection matrix so we can specify the plane in screen
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coordinates */
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_cogl_current_matrix_identity ();
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cogl_matrix_init_from_array (&inverse_projection,
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ctx->inverse_projection);
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_cogl_current_matrix_multiply (&inverse_projection);
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/* Rotate about point a */
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_cogl_current_matrix_translate (vertex_a[0], vertex_a[1], vertex_a[2]);
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/* Rotate the plane by the calculated angle so that it will connect
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the two points */
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_cogl_current_matrix_rotate (angle, 0.0f, 0.0f, 1.0f);
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_cogl_current_matrix_translate (-vertex_a[0], -vertex_a[1], -vertex_a[2]);
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_cogl_current_matrix_state_flush ();
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plane[0] = 0;
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plane[1] = -1.0;
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plane[2] = 0;
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plane[3] = vertex_a[1];
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#if defined (HAVE_COGL_GLES2) || defined (HAVE_COGL_GLES)
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GE( glClipPlanef (plane_num, plane) );
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#else
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GE( glClipPlane (plane_num, plane) );
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#endif
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_cogl_current_matrix_pop ();
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}
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void
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_cogl_set_clip_planes (float x_offset,
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float y_offset,
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float width,
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float height)
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{
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CoglMatrix modelview_matrix;
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CoglMatrix projection_matrix;
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float vertex_tl[4] = { x_offset, y_offset, 0, 1.0 };
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float vertex_tr[4] = { x_offset + width, y_offset, 0, 1.0 };
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float vertex_bl[4] = { x_offset, y_offset + height, 0, 1.0 };
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float vertex_br[4] = { x_offset + width, y_offset + height,
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0, 1.0 };
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_cogl_get_matrix (COGL_MATRIX_PROJECTION,
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&projection_matrix);
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_cogl_get_matrix (COGL_MATRIX_MODELVIEW,
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&modelview_matrix);
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project_vertex (&modelview_matrix, &projection_matrix, vertex_tl);
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project_vertex (&modelview_matrix, &projection_matrix, vertex_tr);
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project_vertex (&modelview_matrix, &projection_matrix, vertex_bl);
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project_vertex (&modelview_matrix, &projection_matrix, vertex_br);
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|
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/* If the order of the top and bottom lines is different from the
|
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order of the left and right lines then the clip rect must have
|
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been transformed so that the back is visible. We therefore need
|
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to swap one pair of vertices otherwise all of the planes will be
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the wrong way around */
|
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if ((vertex_tl[0] < vertex_tr[0] ? 1 : 0)
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!= (vertex_bl[1] < vertex_tl[1] ? 1 : 0))
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{
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float temp[4];
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memcpy (temp, vertex_tl, sizeof (temp));
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memcpy (vertex_tl, vertex_tr, sizeof (temp));
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memcpy (vertex_tr, temp, sizeof (temp));
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memcpy (temp, vertex_bl, sizeof (temp));
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memcpy (vertex_bl, vertex_br, sizeof (temp));
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memcpy (vertex_br, temp, sizeof (temp));
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}
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set_clip_plane (GL_CLIP_PLANE0, vertex_tl, vertex_tr);
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set_clip_plane (GL_CLIP_PLANE1, vertex_tr, vertex_br);
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set_clip_plane (GL_CLIP_PLANE2, vertex_br, vertex_bl);
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set_clip_plane (GL_CLIP_PLANE3, vertex_bl, vertex_tl);
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}
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void
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_cogl_add_stencil_clip (float x_offset,
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float y_offset,
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float width,
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float height,
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gboolean first)
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{
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CoglHandle current_source;
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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_cogl_journal_flush ();
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/* temporarily swap in our special stenciling material */
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current_source = cogl_handle_ref (ctx->source_material);
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cogl_set_source (ctx->stencil_material);
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if (first)
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{
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GE( glEnable (GL_STENCIL_TEST) );
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/* Initially disallow everything */
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GE( glClearStencil (0) );
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GE( glClear (GL_STENCIL_BUFFER_BIT) );
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|
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/* Punch out a hole to allow the rectangle */
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GE( glStencilFunc (GL_NEVER, 0x1, 0x1) );
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GE( glStencilOp (GL_REPLACE, GL_REPLACE, GL_REPLACE) );
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cogl_rectangle (x_offset, y_offset,
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x_offset + width, y_offset + height);
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}
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else
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{
|
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/* Add one to every pixel of the stencil buffer in the
|
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rectangle */
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GE( glStencilFunc (GL_NEVER, 0x1, 0x3) );
|
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GE( glStencilOp (GL_INCR, GL_INCR, GL_INCR) );
|
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cogl_rectangle (x_offset, y_offset,
|
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x_offset + width, y_offset + height);
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|
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/* Subtract one from all pixels in the stencil buffer so that
|
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only pixels where both the original stencil buffer and the
|
|
rectangle are set will be valid */
|
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GE( glStencilOp (GL_DECR, GL_DECR, GL_DECR) );
|
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|
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_cogl_set_current_matrix (COGL_MATRIX_PROJECTION);
|
|
_cogl_current_matrix_push ();
|
|
_cogl_current_matrix_identity ();
|
|
|
|
/* Cogl generally assumes the modelview matrix is current, so since
|
|
* cogl_rectangle will be flushing GL state and emitting geometry
|
|
* to OpenGL it will be confused if we leave the projection matrix
|
|
* active... */
|
|
_cogl_set_current_matrix (COGL_MATRIX_MODELVIEW);
|
|
_cogl_current_matrix_push ();
|
|
_cogl_current_matrix_identity ();
|
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|
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cogl_rectangle (-1.0, -1.0, 1.0, 1.0);
|
|
|
|
_cogl_current_matrix_pop ();
|
|
|
|
_cogl_set_current_matrix (COGL_MATRIX_PROJECTION);
|
|
_cogl_current_matrix_pop ();
|
|
|
|
_cogl_set_current_matrix (COGL_MATRIX_MODELVIEW);
|
|
}
|
|
|
|
/* make sure our rectangles hit the stencil buffer before we restore
|
|
* the stencil function / operation */
|
|
_cogl_journal_flush ();
|
|
|
|
/* Restore the stencil mode */
|
|
GE( glStencilFunc (GL_EQUAL, 0x1, 0x1) );
|
|
GE( glStencilOp (GL_KEEP, GL_KEEP, GL_KEEP) );
|
|
|
|
/* restore the original source material */
|
|
cogl_set_source (current_source);
|
|
cogl_handle_unref (current_source);
|
|
}
|
|
|
|
void
|
|
_cogl_disable_stencil_buffer (void)
|
|
{
|
|
GE( glDisable (GL_STENCIL_TEST) );
|
|
}
|
|
|
|
void
|
|
_cogl_enable_clip_planes (void)
|
|
{
|
|
GE( glEnable (GL_CLIP_PLANE0) );
|
|
GE( glEnable (GL_CLIP_PLANE1) );
|
|
GE( glEnable (GL_CLIP_PLANE2) );
|
|
GE( glEnable (GL_CLIP_PLANE3) );
|
|
}
|
|
|
|
void
|
|
_cogl_disable_clip_planes (void)
|
|
{
|
|
GE( glDisable (GL_CLIP_PLANE3) );
|
|
GE( glDisable (GL_CLIP_PLANE2) );
|
|
GE( glDisable (GL_CLIP_PLANE1) );
|
|
GE( glDisable (GL_CLIP_PLANE0) );
|
|
}
|
|
|
|
void
|
|
cogl_viewport (guint width,
|
|
guint height)
|
|
{
|
|
GE( glViewport (0, 0, width, height) );
|
|
}
|
|
|
|
void
|
|
_cogl_setup_viewport (guint width,
|
|
guint height,
|
|
float fovy,
|
|
float aspect,
|
|
float z_near,
|
|
float z_far)
|
|
{
|
|
float z_camera;
|
|
CoglMatrix projection_matrix;
|
|
|
|
GE( glViewport (0, 0, width, height) );
|
|
|
|
/* For Ortho projection.
|
|
* _cogl_current_matrix_ortho (0, width, 0, height, -1, 1);
|
|
*/
|
|
|
|
cogl_perspective (fovy, aspect, z_near, z_far);
|
|
|
|
/*
|
|
* In theory, we can compute the camera distance from screen as:
|
|
*
|
|
* 0.5 * tan (FOV)
|
|
*
|
|
* However, it's better to compute the z_camera from our projection
|
|
* matrix so that we get a 1:1 mapping at the screen distance. Consider
|
|
* the upper-left corner of the screen. It has object coordinates
|
|
* (0,0,0), so by the transform below, ends up with eye coordinate
|
|
*
|
|
* x_eye = x_object / width - 0.5 = - 0.5
|
|
* y_eye = (height - y_object) / width - 0.5 = 0.5
|
|
* z_eye = z_object / width - z_camera = - z_camera
|
|
*
|
|
* From cogl_perspective(), we know that the projection matrix has
|
|
* the form:
|
|
*
|
|
* (x, 0, 0, 0)
|
|
* (0, y, 0, 0)
|
|
* (0, 0, c, d)
|
|
* (0, 0, -1, 0)
|
|
*
|
|
* Applied to the above, we get clip coordinates of
|
|
*
|
|
* x_clip = x * (- 0.5)
|
|
* y_clip = y * 0.5
|
|
* w_clip = - 1 * (- z_camera) = z_camera
|
|
*
|
|
* Dividing through by w to get normalized device coordinates, we
|
|
* have, x_nd = x * 0.5 / z_camera, y_nd = - y * 0.5 / z_camera.
|
|
* The upper left corner of the screen has normalized device coordinates,
|
|
* (-1, 1), so to have the correct 1:1 mapping, we have to have:
|
|
*
|
|
* z_camera = 0.5 * x = 0.5 * y
|
|
*
|
|
* If x != y, then we have a non-uniform aspect ration, and a 1:1 mapping
|
|
* doesn't make sense.
|
|
*/
|
|
|
|
cogl_get_projection_matrix (&projection_matrix);
|
|
z_camera = 0.5 * projection_matrix.xx;
|
|
|
|
_cogl_current_matrix_identity ();
|
|
_cogl_current_matrix_translate (-0.5f, -0.5f, -z_camera);
|
|
_cogl_current_matrix_scale (1.0f / width, -1.0f / height, 1.0f / width);
|
|
_cogl_current_matrix_translate (0.0f, -1.0 * height, 0.0f);
|
|
}
|
|
|
|
CoglFeatureFlags
|
|
cogl_get_features (void)
|
|
{
|
|
_COGL_GET_CONTEXT (ctx, 0);
|
|
|
|
if (!ctx->features_cached)
|
|
_cogl_features_init ();
|
|
|
|
if (cogl_debug_flags & COGL_DEBUG_DISABLE_VBOS)
|
|
ctx->feature_flags &= ~COGL_FEATURE_VBOS;
|
|
|
|
return ctx->feature_flags;
|
|
}
|
|
|
|
gboolean
|
|
cogl_features_available (CoglFeatureFlags features)
|
|
{
|
|
_COGL_GET_CONTEXT (ctx, 0);
|
|
|
|
if (!ctx->features_cached)
|
|
_cogl_features_init ();
|
|
|
|
return (ctx->feature_flags & features) == features;
|
|
}
|
|
|
|
void
|
|
cogl_get_viewport (float v[4])
|
|
{
|
|
/* FIXME: cogl_get_viewport should return a gint vec */
|
|
/* FIXME: cogl_get_viewport should only return a width + height
|
|
* (I don't think we need to support offset viewports) */
|
|
#if defined (HAVE_COGL_GLES2) || defined (HAVE_COGL_GLES)
|
|
GLint viewport[4];
|
|
int i;
|
|
|
|
glGetIntegerv (GL_VIEWPORT, viewport);
|
|
|
|
for (i = 0; i < 4; i++)
|
|
v[i] = (float)(viewport[i]);
|
|
#else
|
|
glGetFloatv (GL_VIEWPORT, v);
|
|
#endif
|
|
}
|
|
|
|
void
|
|
cogl_get_bitmasks (gint *red,
|
|
gint *green,
|
|
gint *blue,
|
|
gint *alpha)
|
|
{
|
|
GLint value;
|
|
|
|
if (red)
|
|
{
|
|
GE( glGetIntegerv(GL_RED_BITS, &value) );
|
|
*red = value;
|
|
}
|
|
|
|
if (green)
|
|
{
|
|
GE( glGetIntegerv(GL_GREEN_BITS, &value) );
|
|
*green = value;
|
|
}
|
|
|
|
if (blue)
|
|
{
|
|
GE( glGetIntegerv(GL_BLUE_BITS, &value) );
|
|
*blue = value;
|
|
}
|
|
|
|
if (alpha)
|
|
{
|
|
GE( glGetIntegerv(GL_ALPHA_BITS, &value ) );
|
|
*alpha = value;
|
|
}
|
|
}
|
|
|
|
void
|
|
cogl_set_fog (const CoglColor *fog_color,
|
|
CoglFogMode mode,
|
|
float density,
|
|
float z_near,
|
|
float z_far)
|
|
{
|
|
GLfloat fogColor[4];
|
|
GLenum gl_mode = GL_LINEAR;
|
|
|
|
/* The cogl journal doesn't currently track fog state changes */
|
|
_cogl_journal_flush ();
|
|
|
|
fogColor[0] = cogl_color_get_red_float (fog_color);
|
|
fogColor[1] = cogl_color_get_green_float (fog_color);
|
|
fogColor[2] = cogl_color_get_blue_float (fog_color);
|
|
fogColor[3] = cogl_color_get_alpha_float (fog_color);
|
|
|
|
glEnable (GL_FOG);
|
|
|
|
glFogfv (GL_FOG_COLOR, fogColor);
|
|
|
|
#if HAVE_COGL_GLES
|
|
switch (mode)
|
|
{
|
|
case COGL_FOG_MODE_LINEAR:
|
|
gl_mode = GL_LINEAR;
|
|
break;
|
|
case COGL_FOG_MODE_EXPONENTIAL:
|
|
gl_mode = GL_EXP;
|
|
break;
|
|
case COGL_FOG_MODE_EXPONENTIAL_SQUARED:
|
|
gl_mode = GL_EXP2;
|
|
break;
|
|
}
|
|
#endif
|
|
/* TODO: support other modes for GLES2 */
|
|
|
|
/* NB: GLES doesn't have glFogi */
|
|
glFogf (GL_FOG_MODE, gl_mode);
|
|
glHint (GL_FOG_HINT, GL_NICEST);
|
|
|
|
glFogf (GL_FOG_DENSITY, (GLfloat) density);
|
|
glFogf (GL_FOG_START, (GLfloat) z_near);
|
|
glFogf (GL_FOG_END, (GLfloat) z_far);
|
|
}
|
|
|
|
void
|
|
cogl_disable_fog (void)
|
|
{
|
|
/* Currently the journal can't track changes to fog state... */
|
|
_cogl_journal_flush ();
|
|
|
|
glDisable (GL_FOG);
|
|
}
|
|
|
|
#if 0
|
|
void
|
|
cogl_flush_gl_state (int flags)
|
|
{
|
|
_cogl_current_matrix_state_flush ();
|
|
}
|
|
#endif
|
|
|
|
void
|
|
cogl_flush (void)
|
|
{
|
|
_cogl_journal_flush ();
|
|
}
|
|
|
|
void
|
|
cogl_read_pixels (int x,
|
|
int y,
|
|
int width,
|
|
int height,
|
|
CoglReadPixelsFlags source,
|
|
CoglPixelFormat format,
|
|
guint8 *pixels)
|
|
{
|
|
GLint viewport[4];
|
|
GLint viewport_height;
|
|
int rowstride = width * 4;
|
|
guint8 temprow[rowstride];
|
|
|
|
g_return_if_fail (format == COGL_PIXEL_FORMAT_RGBA_8888);
|
|
g_return_if_fail (source == COGL_READ_PIXELS_COLOR_BUFFER);
|
|
|
|
glGetIntegerv (GL_VIEWPORT, viewport);
|
|
viewport_height = viewport[3];
|
|
|
|
/* The y co-ordinate should be given in OpenGL's coordinate system
|
|
so 0 is the bottom row */
|
|
y = viewport_height - y - height;
|
|
|
|
/* Setup the pixel store parameters that may have been changed by
|
|
Cogl */
|
|
glPixelStorei (GL_PACK_ALIGNMENT, 4);
|
|
#ifdef HAVE_COGL_GL
|
|
glPixelStorei (GL_PACK_ROW_LENGTH, 0);
|
|
glPixelStorei (GL_PACK_SKIP_PIXELS, 0);
|
|
glPixelStorei (GL_PACK_SKIP_ROWS, 0);
|
|
#endif /* HAVE_COGL_GL */
|
|
|
|
/* make sure any batched primitives get emitted to the GL driver before
|
|
* issuing our read pixels... */
|
|
cogl_flush ();
|
|
|
|
glReadPixels (x, y, width, height, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
|
|
|
|
/* TODO: consider using the GL_MESA_pack_invert extension in the future
|
|
* to avoid this flip... */
|
|
|
|
/* vertically flip the buffer in-place */
|
|
for (y = 0; y < height / 2; y++)
|
|
{
|
|
if (y != height - y - 1) /* skip center row */
|
|
{
|
|
memcpy (temprow,
|
|
pixels + y * rowstride, rowstride);
|
|
memcpy (pixels + y * rowstride,
|
|
pixels + (height - y - 1) * rowstride, rowstride);
|
|
memcpy (pixels + (height - y - 1) * rowstride,
|
|
temprow,
|
|
rowstride);
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
cogl_begin_gl (void)
|
|
{
|
|
CoglMaterialFlushOptions options;
|
|
gulong enable_flags;
|
|
int i;
|
|
|
|
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
|
|
|
|
if (ctx->in_begin_gl_block)
|
|
{
|
|
static gboolean shown = FALSE;
|
|
if (!shown)
|
|
g_warning ("You should not nest cogl_begin_gl/cogl_end_gl blocks");
|
|
shown = TRUE;
|
|
return;
|
|
}
|
|
ctx->in_begin_gl_block = TRUE;
|
|
|
|
/* Flush all batched primitives */
|
|
cogl_flush ();
|
|
|
|
/* Flush our clipping state to GL */
|
|
cogl_clip_ensure ();
|
|
|
|
/* Flush any client side matrix state */
|
|
_cogl_current_matrix_state_flush ();
|
|
|
|
|
|
/* Setup the state for the current material */
|
|
|
|
/* We considered flushing a specific, minimal material here to try and
|
|
* simplify the GL state, but decided to avoid special cases and second
|
|
* guessing what would be actually helpful.
|
|
*
|
|
* A user should instead call cogl_set_source_color4ub() before
|
|
* cogl_begin_gl() to simplify the state flushed.
|
|
*/
|
|
options.flags = 0;
|
|
_cogl_material_flush_gl_state (ctx->source_material, &options);
|
|
|
|
/* FIXME: This api is a bit yukky, ideally it will be removed if we
|
|
* re-work the cogl_enable mechanism */
|
|
enable_flags |= _cogl_material_get_cogl_enable_flags (ctx->source_material);
|
|
|
|
if (ctx->enable_backface_culling)
|
|
enable_flags |= COGL_ENABLE_BACKFACE_CULLING;
|
|
|
|
cogl_enable (enable_flags);
|
|
|
|
/* Disable all client texture coordinate arrays */
|
|
for (i = 0; i < ctx->n_texcoord_arrays_enabled; i++)
|
|
{
|
|
GE (glClientActiveTexture (GL_TEXTURE0 + i));
|
|
GE (glDisableClientState (GL_TEXTURE_COORD_ARRAY));
|
|
}
|
|
ctx->n_texcoord_arrays_enabled = 0;
|
|
}
|
|
|
|
void
|
|
cogl_end_gl (void)
|
|
{
|
|
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
|
|
|
|
if (!ctx->in_begin_gl_block)
|
|
{
|
|
static gboolean shown = FALSE;
|
|
if (!shown)
|
|
g_warning ("cogl_end_gl is being called before cogl_begin_gl");
|
|
shown = TRUE;
|
|
return;
|
|
}
|
|
ctx->in_begin_gl_block = FALSE;
|
|
}
|
|
|