273 lines
8.0 KiB
C
273 lines
8.0 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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_cogl_current_matrix_state_flush ();
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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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