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 "brw_util.h" 32 #include "intel_batchbuffer.h" 33 34 static void 35 upload_clip_state(struct brw_context *brw) 36 { 37 struct intel_context *intel = &brw->intel; 38 struct gl_context *ctx = &intel->ctx; 39 uint32_t depth_clamp = 0; 40 uint32_t provoking, userclip; 41 uint32_t nonperspective_barycentric_enable_flag = 0; 42 43 /* CACHE_NEW_WM_PROG */ 44 if (brw->wm.prog_data->barycentric_interp_modes & 45 BRW_WM_NONPERSPECTIVE_BARYCENTRIC_BITS) { 46 nonperspective_barycentric_enable_flag = 47 GEN6_CLIP_NON_PERSPECTIVE_BARYCENTRIC_ENABLE; 48 } 49 50 if (!ctx->Transform.DepthClamp) 51 depth_clamp = GEN6_CLIP_Z_TEST; 52 53 /* _NEW_LIGHT */ 54 if (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION) { 55 provoking = 56 (0 << GEN6_CLIP_TRI_PROVOKE_SHIFT) | 57 (1 << GEN6_CLIP_TRIFAN_PROVOKE_SHIFT) | 58 (0 << GEN6_CLIP_LINE_PROVOKE_SHIFT); 59 } else { 60 provoking = 61 (2 << GEN6_CLIP_TRI_PROVOKE_SHIFT) | 62 (2 << GEN6_CLIP_TRIFAN_PROVOKE_SHIFT) | 63 (1 << GEN6_CLIP_LINE_PROVOKE_SHIFT); 64 } 65 66 /* _NEW_TRANSFORM */ 67 userclip = ctx->Transform.ClipPlanesEnabled; 68 69 BEGIN_BATCH(4); 70 OUT_BATCH(_3DSTATE_CLIP << 16 | (4 - 2)); 71 OUT_BATCH(GEN6_CLIP_STATISTICS_ENABLE); 72 OUT_BATCH(GEN6_CLIP_ENABLE | 73 GEN6_CLIP_API_OGL | 74 GEN6_CLIP_MODE_NORMAL | 75 nonperspective_barycentric_enable_flag | 76 GEN6_CLIP_XY_TEST | 77 userclip << GEN6_USER_CLIP_CLIP_DISTANCES_SHIFT | 78 depth_clamp | 79 provoking); 80 OUT_BATCH(U_FIXED(0.125, 3) << GEN6_CLIP_MIN_POINT_WIDTH_SHIFT | 81 U_FIXED(255.875, 3) << GEN6_CLIP_MAX_POINT_WIDTH_SHIFT | 82 GEN6_CLIP_FORCE_ZERO_RTAINDEX); 83 ADVANCE_BATCH(); 84 } 85 86 const struct brw_tracked_state gen6_clip_state = { 87 .dirty = { 88 .mesa = _NEW_TRANSFORM | _NEW_LIGHT, 89 .brw = (BRW_NEW_CONTEXT), 90 .cache = CACHE_NEW_WM_PROG 91 }, 92 .emit = upload_clip_state, 93 }; 94
