1 /* 2 * Copyright 2009 Intel Corporation 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 21 * IN THE SOFTWARE. 22 * 23 * Authors: 24 * Eric Anholt <eric (at) anholt.net> 25 * 26 */ 27 28 #include "brw_context.h" 29 #include "brw_state.h" 30 #include "brw_defines.h" 31 #include "intel_batchbuffer.h" 32 #include "main/fbobject.h" 33 #include "main/framebuffer.h" 34 35 static void 36 gen6_upload_scissor_state(struct brw_context *brw) 37 { 38 struct gl_context *ctx = &brw->ctx; 39 const bool render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer); 40 struct gen6_scissor_rect *scissor; 41 uint32_t scissor_state_offset; 42 const unsigned int fb_width= _mesa_geometric_width(ctx->DrawBuffer); 43 const unsigned int fb_height = _mesa_geometric_height(ctx->DrawBuffer); 44 45 /* BRW_NEW_VIEWPORT_COUNT */ 46 const unsigned viewport_count = brw->clip.viewport_count; 47 48 scissor = brw_state_batch(brw, AUB_TRACE_SCISSOR_STATE, 49 sizeof(*scissor) * viewport_count, 32, 50 &scissor_state_offset); 51 52 /* _NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT */ 53 54 /* The scissor only needs to handle the intersection of drawable and 55 * scissor rect. Clipping to the boundaries of static shared buffers 56 * for front/back/depth is covered by looping over cliprects in brw_draw.c. 57 * 58 * Note that the hardware's coordinates are inclusive, while Mesa's min is 59 * inclusive but max is exclusive. 60 */ 61 for (unsigned i = 0; i < viewport_count; i++) { 62 int bbox[4]; 63 64 bbox[0] = MAX2(ctx->ViewportArray[i].X, 0); 65 bbox[1] = MIN2(bbox[0] + ctx->ViewportArray[i].Width, fb_width); 66 bbox[2] = MAX2(ctx->ViewportArray[i].Y, 0); 67 bbox[3] = MIN2(bbox[2] + ctx->ViewportArray[i].Height, fb_height); 68 _mesa_intersect_scissor_bounding_box(ctx, i, bbox); 69 70 if (bbox[0] == bbox[1] || bbox[2] == bbox[3]) { 71 /* If the scissor was out of bounds and got clamped to 0 width/height 72 * at the bounds, the subtraction of 1 from maximums could produce a 73 * negative number and thus not clip anything. Instead, just provide 74 * a min > max scissor inside the bounds, which produces the expected 75 * no rendering. 76 */ 77 scissor[i].xmin = 1; 78 scissor[i].xmax = 0; 79 scissor[i].ymin = 1; 80 scissor[i].ymax = 0; 81 } else if (render_to_fbo) { 82 /* texmemory: Y=0=bottom */ 83 scissor[i].xmin = bbox[0]; 84 scissor[i].xmax = bbox[1] - 1; 85 scissor[i].ymin = bbox[2]; 86 scissor[i].ymax = bbox[3] - 1; 87 } 88 else { 89 /* memory: Y=0=top */ 90 scissor[i].xmin = bbox[0]; 91 scissor[i].xmax = bbox[1] - 1; 92 scissor[i].ymin = fb_height - bbox[3]; 93 scissor[i].ymax = fb_height - bbox[2] - 1; 94 } 95 } 96 BEGIN_BATCH(2); 97 OUT_BATCH(_3DSTATE_SCISSOR_STATE_POINTERS << 16 | (2 - 2)); 98 OUT_BATCH(scissor_state_offset); 99 ADVANCE_BATCH(); 100 } 101 102 const struct brw_tracked_state gen6_scissor_state = { 103 .dirty = { 104 .mesa = _NEW_BUFFERS | 105 _NEW_SCISSOR | 106 _NEW_VIEWPORT, 107 .brw = BRW_NEW_BATCH | 108 BRW_NEW_BLORP | 109 BRW_NEW_VIEWPORT_COUNT, 110 }, 111 .emit = gen6_upload_scissor_state, 112 }; 113
