1/************************************************************************** 2 * 3 * Copyright 2007 VMware, Inc. 4 * All Rights Reserved. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the 8 * "Software"), to deal in the Software without restriction, including 9 * without limitation the rights to use, copy, modify, merge, publish, 10 * distribute, sub license, and/or sell copies of the Software, and to 11 * permit persons to whom the Software is furnished to do so, subject to 12 * the following conditions: 13 * 14 * The above copyright notice and this permission notice (including the 15 * next paragraph) shall be included in all copies or substantial portions 16 * of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. 21 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR 22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 25 * 26 **************************************************************************/ 27 28 /* 29 * \brief polygon stipple state 30 * 31 * Authors: 32 * Brian Paul 33 */ 34 35 36#include <assert.h> 37 38#include "st_context.h" 39#include "st_atom.h" 40#include "pipe/p_context.h" 41#include "pipe/p_defines.h" 42 43 44/** 45 * OpenGL's polygon stipple is indexed with window coordinates in which 46 * the origin (0,0) is the lower-left corner of the window. 47 * With Gallium, the origin is the upper-left corner of the window. 48 * To convert GL's polygon stipple to what gallium expects we need to 49 * invert the pattern vertically and rotate the stipple rows according 50 * to the window height. 51 */ 52static void 53invert_stipple(GLuint dest[32], const GLuint src[32], GLuint winHeight) 54{ 55 GLuint i; 56 57 for (i = 0; i < 32; i++) { 58 dest[i] = src[(winHeight - 1 - i) & 0x1f]; 59 } 60} 61 62 63 64static void 65update_stipple( struct st_context *st ) 66{ 67 const struct gl_context *ctx = st->ctx; 68 const GLuint sz = sizeof(st->state.poly_stipple); 69 assert(sz == sizeof(ctx->PolygonStipple)); 70 71 if (memcmp(st->state.poly_stipple, ctx->PolygonStipple, sz)) { 72 /* state has changed */ 73 struct pipe_poly_stipple newStipple; 74 75 memcpy(st->state.poly_stipple, ctx->PolygonStipple, sz); 76 77 if (_mesa_is_user_fbo(ctx->DrawBuffer)) { 78 memcpy(newStipple.stipple, ctx->PolygonStipple, sizeof(newStipple.stipple)); 79 } else { 80 invert_stipple(newStipple.stipple, ctx->PolygonStipple, 81 ctx->DrawBuffer->Height); 82 } 83 84 st->pipe->set_polygon_stipple(st->pipe, &newStipple); 85 } 86} 87 88 89/** Update the stipple when the pattern or window height changes */ 90const struct st_tracked_state st_update_polygon_stipple = { 91 update_stipple /* update */ 92}; 93