1711af67fe4afa7d982649c101d68474be9294e07Brian/************************************************************************** 2711af67fe4afa7d982649c101d68474be9294e07Brian * 3711af67fe4afa7d982649c101d68474be9294e07Brian * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas. 4711af67fe4afa7d982649c101d68474be9294e07Brian * All Rights Reserved. 5711af67fe4afa7d982649c101d68474be9294e07Brian * 6711af67fe4afa7d982649c101d68474be9294e07Brian * Permission is hereby granted, free of charge, to any person obtaining a 7711af67fe4afa7d982649c101d68474be9294e07Brian * copy of this software and associated documentation files (the 8711af67fe4afa7d982649c101d68474be9294e07Brian * "Software"), to deal in the Software without restriction, including 9711af67fe4afa7d982649c101d68474be9294e07Brian * without limitation the rights to use, copy, modify, merge, publish, 10711af67fe4afa7d982649c101d68474be9294e07Brian * distribute, sub license, and/or sell copies of the Software, and to 11711af67fe4afa7d982649c101d68474be9294e07Brian * permit persons to whom the Software is furnished to do so, subject to 12711af67fe4afa7d982649c101d68474be9294e07Brian * the following conditions: 13711af67fe4afa7d982649c101d68474be9294e07Brian * 14711af67fe4afa7d982649c101d68474be9294e07Brian * The above copyright notice and this permission notice (including the 15711af67fe4afa7d982649c101d68474be9294e07Brian * next paragraph) shall be included in all copies or substantial portions 16711af67fe4afa7d982649c101d68474be9294e07Brian * of the Software. 17711af67fe4afa7d982649c101d68474be9294e07Brian * 18711af67fe4afa7d982649c101d68474be9294e07Brian * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 19711af67fe4afa7d982649c101d68474be9294e07Brian * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 20711af67fe4afa7d982649c101d68474be9294e07Brian * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. 21711af67fe4afa7d982649c101d68474be9294e07Brian * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR 22711af67fe4afa7d982649c101d68474be9294e07Brian * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 23711af67fe4afa7d982649c101d68474be9294e07Brian * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 24711af67fe4afa7d982649c101d68474be9294e07Brian * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 25711af67fe4afa7d982649c101d68474be9294e07Brian * 26711af67fe4afa7d982649c101d68474be9294e07Brian **************************************************************************/ 27711af67fe4afa7d982649c101d68474be9294e07Brian 28711af67fe4afa7d982649c101d68474be9294e07Brian /* 29711af67fe4afa7d982649c101d68474be9294e07Brian * Authors: 30711af67fe4afa7d982649c101d68474be9294e07Brian * Keith Whitwell <keith@tungstengraphics.com> 31711af67fe4afa7d982649c101d68474be9294e07Brian */ 32711af67fe4afa7d982649c101d68474be9294e07Brian 33711af67fe4afa7d982649c101d68474be9294e07Brian 3447d30b0c2c36f952cc14deefb9f937f1b0a9b531Brian Paul#include "main/macros.h" 35711af67fe4afa7d982649c101d68474be9294e07Brian#include "st_context.h" 36943964a1e5bad86bdceb0a06d60fb3b302ebce6aKeith Whitwell#include "pipe/p_context.h" 37711af67fe4afa7d982649c101d68474be9294e07Brian#include "st_atom.h" 38711af67fe4afa7d982649c101d68474be9294e07Brian 39711af67fe4afa7d982649c101d68474be9294e07Brian 409267341bd01900bc78700928e5836d0f52572e38Brian/** 419267341bd01900bc78700928e5836d0f52572e38Brian * Scissor depends on the scissor box, and the framebuffer dimensions. 42711af67fe4afa7d982649c101d68474be9294e07Brian */ 439267341bd01900bc78700928e5836d0f52572e38Brianstatic void 449267341bd01900bc78700928e5836d0f52572e38Brianupdate_scissor( struct st_context *st ) 45711af67fe4afa7d982649c101d68474be9294e07Brian{ 46ea92566ed9cabf5eb5d0993b39c4372d5bfcf3f1Brian struct pipe_scissor_state scissor; 4799feecc7d1d0a6efb2511859973d6029d9fed9fdBrian Paul const struct gl_context *ctx = st->ctx; 4899feecc7d1d0a6efb2511859973d6029d9fed9fdBrian Paul const struct gl_framebuffer *fb = ctx->DrawBuffer; 49717831ea712c07e18f2c2e797c49754bf2500e5eBrian GLint miny, maxy; 509267341bd01900bc78700928e5836d0f52572e38Brian 519267341bd01900bc78700928e5836d0f52572e38Brian scissor.minx = 0; 529267341bd01900bc78700928e5836d0f52572e38Brian scissor.miny = 0; 539267341bd01900bc78700928e5836d0f52572e38Brian scissor.maxx = fb->Width; 549267341bd01900bc78700928e5836d0f52572e38Brian scissor.maxy = fb->Height; 559267341bd01900bc78700928e5836d0f52572e38Brian 5699feecc7d1d0a6efb2511859973d6029d9fed9fdBrian Paul if (ctx->Scissor.Enabled) { 5747d30b0c2c36f952cc14deefb9f937f1b0a9b531Brian Paul /* need to be careful here with xmax or ymax < 0 */ 5899feecc7d1d0a6efb2511859973d6029d9fed9fdBrian Paul GLint xmax = MAX2(0, ctx->Scissor.X + ctx->Scissor.Width); 5999feecc7d1d0a6efb2511859973d6029d9fed9fdBrian Paul GLint ymax = MAX2(0, ctx->Scissor.Y + ctx->Scissor.Height); 6047d30b0c2c36f952cc14deefb9f937f1b0a9b531Brian Paul 6199feecc7d1d0a6efb2511859973d6029d9fed9fdBrian Paul if (ctx->Scissor.X > (GLint)scissor.minx) 6299feecc7d1d0a6efb2511859973d6029d9fed9fdBrian Paul scissor.minx = ctx->Scissor.X; 6399feecc7d1d0a6efb2511859973d6029d9fed9fdBrian Paul if (ctx->Scissor.Y > (GLint)scissor.miny) 6499feecc7d1d0a6efb2511859973d6029d9fed9fdBrian Paul scissor.miny = ctx->Scissor.Y; 659267341bd01900bc78700928e5836d0f52572e38Brian 6647d30b0c2c36f952cc14deefb9f937f1b0a9b531Brian Paul if (xmax < (GLint) scissor.maxx) 6747d30b0c2c36f952cc14deefb9f937f1b0a9b531Brian Paul scissor.maxx = xmax; 6847d30b0c2c36f952cc14deefb9f937f1b0a9b531Brian Paul if (ymax < (GLint) scissor.maxy) 6947d30b0c2c36f952cc14deefb9f937f1b0a9b531Brian Paul scissor.maxy = ymax; 709267341bd01900bc78700928e5836d0f52572e38Brian 719267341bd01900bc78700928e5836d0f52572e38Brian /* check for null space */ 729267341bd01900bc78700928e5836d0f52572e38Brian if (scissor.minx >= scissor.maxx || scissor.miny >= scissor.maxy) 739267341bd01900bc78700928e5836d0f52572e38Brian scissor.minx = scissor.miny = scissor.maxx = scissor.maxy = 0; 749267341bd01900bc78700928e5836d0f52572e38Brian } 75711af67fe4afa7d982649c101d68474be9294e07Brian 76c060265bdb953f0c9d73e60f08c53a2e3b1a1176Brian Paul /* Now invert Y if needed. 77c060265bdb953f0c9d73e60f08c53a2e3b1a1176Brian Paul * Gallium drivers use the convention Y=0=top for surfaces. 78717831ea712c07e18f2c2e797c49754bf2500e5eBrian */ 79c060265bdb953f0c9d73e60f08c53a2e3b1a1176Brian Paul if (st_fb_orientation(fb) == Y_0_TOP) { 80c060265bdb953f0c9d73e60f08c53a2e3b1a1176Brian Paul miny = fb->Height - scissor.maxy; 81c060265bdb953f0c9d73e60f08c53a2e3b1a1176Brian Paul maxy = fb->Height - scissor.miny; 82c060265bdb953f0c9d73e60f08c53a2e3b1a1176Brian Paul scissor.miny = miny; 83c060265bdb953f0c9d73e60f08c53a2e3b1a1176Brian Paul scissor.maxy = maxy; 84c060265bdb953f0c9d73e60f08c53a2e3b1a1176Brian Paul } 85717831ea712c07e18f2c2e797c49754bf2500e5eBrian 86711af67fe4afa7d982649c101d68474be9294e07Brian if (memcmp(&scissor, &st->state.scissor, sizeof(scissor)) != 0) { 87711af67fe4afa7d982649c101d68474be9294e07Brian /* state has changed */ 88711af67fe4afa7d982649c101d68474be9294e07Brian st->state.scissor = scissor; /* struct copy */ 89ea92566ed9cabf5eb5d0993b39c4372d5bfcf3f1Brian st->pipe->set_scissor_state(st->pipe, &scissor); /* activate */ 90711af67fe4afa7d982649c101d68474be9294e07Brian } 91711af67fe4afa7d982649c101d68474be9294e07Brian} 92711af67fe4afa7d982649c101d68474be9294e07Brian 93711af67fe4afa7d982649c101d68474be9294e07Brian 94711af67fe4afa7d982649c101d68474be9294e07Brianconst struct st_tracked_state st_update_scissor = { 9554507125e735ffa595e252282eaabf38095c21e1Alan Hourihane "st_update_scissor", /* name */ 9654507125e735ffa595e252282eaabf38095c21e1Alan Hourihane { /* dirty */ 9754507125e735ffa595e252282eaabf38095c21e1Alan Hourihane (_NEW_SCISSOR | _NEW_BUFFERS), /* mesa */ 9854507125e735ffa595e252282eaabf38095c21e1Alan Hourihane 0, /* st */ 99711af67fe4afa7d982649c101d68474be9294e07Brian }, 10054507125e735ffa595e252282eaabf38095c21e1Alan Hourihane update_scissor /* update */ 101711af67fe4afa7d982649c101d68474be9294e07Brian}; 102