7b7787b050
Using cogl_rectangle (and thus the journal) in _cogl_add_path_to_stencil_buffer means we have to consider all the state that the journal may change in case it may interfer with the direct GL calls used. This has proven to be error prone and in this case the journal is an unnecissary overhead. We now simply call glRectf instead of using cogl_rectangle.
271 lines
7.9 KiB
C
271 lines
7.9 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 "cogl-internal.h"
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#include "cogl-context.h"
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#include "cogl-clip-stack.h"
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#include "cogl-material-private.h"
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#include <string.h>
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#include <gmodule.h>
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#include <math.h>
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#define _COGL_MAX_BEZ_RECURSE_DEPTH 16
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void
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_cogl_path_add_node (gboolean new_sub_path,
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float x,
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float y)
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{
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CoglPathNode new_node;
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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new_node.x = x;
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new_node.y = y;
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new_node.path_size = 0;
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if (new_sub_path || ctx->path_nodes->len == 0)
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ctx->last_path = ctx->path_nodes->len;
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g_array_append_val (ctx->path_nodes, new_node);
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g_array_index (ctx->path_nodes, CoglPathNode, ctx->last_path).path_size++;
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if (ctx->path_nodes->len == 1)
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{
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ctx->path_nodes_min.x = ctx->path_nodes_max.x = x;
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ctx->path_nodes_min.y = ctx->path_nodes_max.y = y;
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}
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else
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{
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if (x < ctx->path_nodes_min.x) ctx->path_nodes_min.x = x;
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if (x > ctx->path_nodes_max.x) ctx->path_nodes_max.x = x;
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if (y < ctx->path_nodes_min.y) ctx->path_nodes_min.y = y;
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if (y > ctx->path_nodes_max.y) ctx->path_nodes_max.y = y;
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}
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}
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void
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_cogl_path_stroke_nodes ()
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{
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guint path_start = 0;
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gulong enable_flags = COGL_ENABLE_VERTEX_ARRAY;
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CoglMaterialFlushOptions options;
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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enable_flags |= _cogl_material_get_cogl_enable_flags (ctx->source_material);
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cogl_enable (enable_flags);
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options.flags = COGL_MATERIAL_FLUSH_DISABLE_MASK;
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/* disable all texture layers */
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options.disable_layers = (guint32)~0;
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_cogl_material_flush_gl_state (ctx->source_material, &options);
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_cogl_current_matrix_state_flush ();
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while (path_start < ctx->path_nodes->len)
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{
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CoglPathNode *path = &g_array_index (ctx->path_nodes, CoglPathNode,
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path_start);
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GE( glVertexPointer (2, GL_FLOAT, sizeof (CoglPathNode),
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(guchar *) path
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+ G_STRUCT_OFFSET (CoglPathNode, x)) );
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GE( glDrawArrays (GL_LINE_STRIP, 0, path->path_size) );
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path_start += path->path_size;
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}
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}
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static void
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_cogl_path_get_bounds (floatVec2 nodes_min,
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floatVec2 nodes_max,
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float *bounds_x,
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float *bounds_y,
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float *bounds_w,
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float *bounds_h)
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{
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*bounds_x = nodes_min.x;
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*bounds_y = nodes_min.y;
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*bounds_w = nodes_max.x - *bounds_x;
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*bounds_h = nodes_max.y - *bounds_y;
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}
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void
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_cogl_add_path_to_stencil_buffer (floatVec2 nodes_min,
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floatVec2 nodes_max,
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guint path_size,
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CoglPathNode *path,
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gboolean merge)
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{
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guint path_start = 0;
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guint sub_path_num = 0;
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float bounds_x;
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float bounds_y;
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float bounds_w;
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float bounds_h;
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gulong enable_flags = COGL_ENABLE_VERTEX_ARRAY;
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CoglHandle prev_source;
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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_cogl_journal_flush ();
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/* Just setup a simple material that doesn't use texturing... */
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prev_source = cogl_handle_ref (ctx->source_material);
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cogl_set_source (ctx->stencil_material);
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_cogl_material_flush_gl_state (ctx->source_material, NULL);
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enable_flags |=
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_cogl_material_get_cogl_enable_flags (ctx->source_material);
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cogl_enable (enable_flags);
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_cogl_path_get_bounds (nodes_min, nodes_max,
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&bounds_x, &bounds_y, &bounds_w, &bounds_h);
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if (merge)
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{
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GE( glStencilMask (2) );
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GE( glStencilFunc (GL_LEQUAL, 0x2, 0x6) );
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}
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else
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{
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GE( glClear (GL_STENCIL_BUFFER_BIT) );
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GE( glStencilMask (1) );
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GE( glStencilFunc (GL_LEQUAL, 0x1, 0x3) );
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}
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GE( glEnable (GL_STENCIL_TEST) );
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GE( glStencilOp (GL_INVERT, GL_INVERT, GL_INVERT) );
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GE( glColorMask (FALSE, FALSE, FALSE, FALSE) );
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GE( glDepthMask (FALSE) );
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_cogl_current_matrix_state_flush ();
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while (path_start < path_size)
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{
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GE( glVertexPointer (2, GL_FLOAT, sizeof (CoglPathNode),
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(guchar *) path
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+ G_STRUCT_OFFSET (CoglPathNode, x)) );
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GE( glDrawArrays (GL_TRIANGLE_FAN, 0, path->path_size) );
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if (sub_path_num > 0)
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{
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/* Union the two stencil buffers bits into the least
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significant bit */
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GE( glStencilMask (merge ? 6 : 3) );
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GE( glStencilOp (GL_ZERO, GL_REPLACE, GL_REPLACE) );
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glRectf (bounds_x, bounds_y,
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bounds_x + bounds_w, bounds_y + bounds_h);
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GE( glStencilOp (GL_INVERT, GL_INVERT, GL_INVERT) );
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}
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GE( glStencilMask (merge ? 4 : 2) );
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path_start += path->path_size;
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path += path->path_size;
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sub_path_num++;
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}
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if (merge)
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{
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/* Now we have the new stencil buffer in bit 1 and the old
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stencil buffer in bit 0 so we need to intersect them */
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GE( glStencilMask (3) );
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GE( glStencilFunc (GL_NEVER, 0x2, 0x3) );
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GE( glStencilOp (GL_DECR, GL_DECR, GL_DECR) );
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/* Decrement all of the bits twice so that only pixels where the
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value is 3 will remain */
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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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glRectf (-1.0, -1.0, 1.0, 1.0);
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glRectf (-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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GE( glStencilMask (~(GLuint) 0) );
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GE( glDepthMask (TRUE) );
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GE( glColorMask (TRUE, TRUE, TRUE, TRUE) );
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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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/* restore the original material */
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cogl_set_source (prev_source);
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cogl_handle_unref (prev_source);
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}
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void
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_cogl_path_fill_nodes ()
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{
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float bounds_x;
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float bounds_y;
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float bounds_w;
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float bounds_h;
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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_cogl_path_get_bounds (ctx->path_nodes_min, ctx->path_nodes_max,
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&bounds_x, &bounds_y, &bounds_w, &bounds_h);
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_cogl_add_path_to_stencil_buffer (ctx->path_nodes_min,
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ctx->path_nodes_max,
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ctx->path_nodes->len,
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&g_array_index (ctx->path_nodes,
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CoglPathNode, 0),
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ctx->clip.stencil_used);
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cogl_rectangle (bounds_x, bounds_y,
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bounds_x + bounds_w, bounds_y + bounds_h);
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/* The stencil buffer now contains garbage so the clip area needs to
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be rebuilt */
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ctx->clip.stack_dirty = TRUE;
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}
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