02faadae8b
This is being removed before we release Clutter 1.0 since the implementation wasn't complete, and so we assume no one is using this yet. Util we have someone with a good usecase, we can't pretend to support breaking out into raw OpenGL.
664 lines
16 KiB
C
664 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, 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_enable_depth_test (gboolean setting)
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{
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if (setting)
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{
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glEnable (GL_DEPTH_TEST);
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glEnable (GL_ALPHA_TEST);
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glDepthFunc (GL_LEQUAL);
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glAlphaFunc (GL_GREATER, 0.1);
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}
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else
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{
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glDisable (GL_DEPTH_TEST);
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glDisable (GL_ALPHA_TEST);
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}
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}
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void
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cogl_enable_backface_culling (gboolean setting)
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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ctx->enable_backface_culling = setting;
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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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_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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cogl_material_set_color (ctx->default_material, color);
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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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/* 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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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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_cogl_material_flush_gl_state (ctx->stencil_material, NULL);
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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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/* 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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/* 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
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rectangle are set will be valid */
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GE( glStencilOp (GL_DECR, GL_DECR, GL_DECR) );
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_cogl_set_current_matrix (COGL_MATRIX_PROJECTION);
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_cogl_current_matrix_push ();
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_cogl_current_matrix_identity ();
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/* Cogl generally assumes the modelview matrix is current, so since
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* cogl_rectangle will be flushing GL state and emitting geometry
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* to OpenGL it will be confused if we leave the projection matrix
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* active... */
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_cogl_set_current_matrix (COGL_MATRIX_MODELVIEW);
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_cogl_current_matrix_push ();
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_cogl_current_matrix_identity ();
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cogl_rectangle (-1.0, -1.0, 1.0, 1.0);
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_cogl_current_matrix_pop ();
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_cogl_set_current_matrix (COGL_MATRIX_PROJECTION);
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_cogl_current_matrix_pop ();
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_cogl_set_current_matrix (COGL_MATRIX_MODELVIEW);
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}
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/* Restore the stencil mode */
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GE( glStencilFunc (GL_EQUAL, 0x1, 0x1) );
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GE( glStencilOp (GL_KEEP, GL_KEEP, GL_KEEP) );
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}
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void
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_cogl_disable_stencil_buffer (void)
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{
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GE( glDisable (GL_STENCIL_TEST) );
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}
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void
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_cogl_enable_clip_planes (void)
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{
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GE( glEnable (GL_CLIP_PLANE0) );
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GE( glEnable (GL_CLIP_PLANE1) );
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GE( glEnable (GL_CLIP_PLANE2) );
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GE( glEnable (GL_CLIP_PLANE3) );
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}
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void
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_cogl_disable_clip_planes (void)
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{
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GE( glDisable (GL_CLIP_PLANE3) );
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GE( glDisable (GL_CLIP_PLANE2) );
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GE( glDisable (GL_CLIP_PLANE1) );
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GE( glDisable (GL_CLIP_PLANE0) );
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}
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void
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cogl_viewport (guint width,
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guint height)
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{
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GE( glViewport (0, 0, width, height) );
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}
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void
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cogl_setup_viewport (guint width,
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guint height,
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float fovy,
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float aspect,
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float z_near,
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float z_far)
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{
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float z_camera;
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CoglMatrix projection_matrix;
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GE( glViewport (0, 0, width, height) );
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/* For Ortho projection.
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* _cogl_current_matrix_ortho (0, width << 16, 0, height << 16, -1 << 16, 1 << 16);
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*/
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cogl_perspective (fovy, aspect, z_near, z_far);
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/*
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* In theory, we can compute the camera distance from screen as:
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*
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* 0.5 * tan (FOV)
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*
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* However, it's better to compute the z_camera from our projection
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* matrix so that we get a 1:1 mapping at the screen distance. Consider
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* the upper-left corner of the screen. It has object coordinates
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* (0,0,0), so by the transform below, ends up with eye coordinate
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*
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* x_eye = x_object / width - 0.5 = - 0.5
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* y_eye = (height - y_object) / width - 0.5 = 0.5
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* z_eye = z_object / width - z_camera = - z_camera
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*
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* From cogl_perspective(), we know that the projection matrix has
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* the form:
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*
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* (x, 0, 0, 0)
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* (0, y, 0, 0)
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* (0, 0, c, d)
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* (0, 0, -1, 0)
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*
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* Applied to the above, we get clip coordinates of
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*
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* x_clip = x * (- 0.5)
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* y_clip = y * 0.5
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* w_clip = - 1 * (- z_camera) = z_camera
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*
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* Dividing through by w to get normalized device coordinates, we
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* have, x_nd = x * 0.5 / z_camera, y_nd = - y * 0.5 / z_camera.
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* The upper left corner of the screen has normalized device coordinates,
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* (-1, 1), so to have the correct 1:1 mapping, we have to have:
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*
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* z_camera = 0.5 * x = 0.5 * y
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|
*
|
|
* 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 ()
|
|
{
|
|
_COGL_GET_CONTEXT (ctx, 0);
|
|
|
|
if (!ctx->features_cached)
|
|
_cogl_features_init ();
|
|
|
|
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 */
|
|
#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;
|
|
|
|
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)
|
|
{
|
|
glDisable (GL_FOG);
|
|
}
|
|
|
|
#if 0
|
|
void
|
|
cogl_flush_gl_state (int flags)
|
|
{
|
|
_cogl_current_matrix_state_flush ();
|
|
}
|
|
#endif
|
|
|