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 34 /* The clip VP defines the guardband region where expensive clipping is skipped 35 * and fragments are allowed to be generated and clipped out cheaply by the SF. 36 * 37 * By setting it to NDC bounds of [-1,1], we don't do GB clipping. It's 38 * supposed to cause seams to become visible in apps due to shared edges taking 39 * different clip/no clip paths depending on whether the rest of the prim ends 40 * up in the guardband or not. 41 */ 42 static void 43 gen6_upload_clip_vp(struct brw_context *brw) 44 { 45 struct brw_clipper_viewport *vp; 46 47 vp = brw_state_batch(brw, AUB_TRACE_CLIP_VP_STATE, 48 sizeof(*vp), 32, &brw->clip.vp_offset); 49 50 vp->xmin = -1.0; 51 vp->xmax = 1.0; 52 vp->ymin = -1.0; 53 vp->ymax = 1.0; 54 55 brw->state.dirty.cache |= CACHE_NEW_CLIP_VP; 56 } 57 58 const struct brw_tracked_state gen6_clip_vp = { 59 .dirty = { 60 .mesa = 0, 61 .brw = BRW_NEW_BATCH, 62 .cache = 0, 63 }, 64 .emit = gen6_upload_clip_vp, 65 }; 66 67 static void 68 gen6_upload_sf_vp(struct brw_context *brw) 69 { 70 struct gl_context *ctx = &brw->intel.ctx; 71 const GLfloat depth_scale = 1.0F / ctx->DrawBuffer->_DepthMaxF; 72 struct brw_sf_viewport *sfv; 73 GLfloat y_scale, y_bias; 74 const bool render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer); 75 const GLfloat *v = ctx->Viewport._WindowMap.m; 76 77 sfv = brw_state_batch(brw, AUB_TRACE_SF_VP_STATE, 78 sizeof(*sfv), 32, &brw->sf.vp_offset); 79 memset(sfv, 0, sizeof(*sfv)); 80 81 /* _NEW_BUFFERS */ 82 if (render_to_fbo) { 83 y_scale = 1.0; 84 y_bias = 0; 85 } else { 86 y_scale = -1.0; 87 y_bias = ctx->DrawBuffer->Height; 88 } 89 90 /* _NEW_VIEWPORT */ 91 sfv->viewport.m00 = v[MAT_SX]; 92 sfv->viewport.m11 = v[MAT_SY] * y_scale; 93 sfv->viewport.m22 = v[MAT_SZ] * depth_scale; 94 sfv->viewport.m30 = v[MAT_TX]; 95 sfv->viewport.m31 = v[MAT_TY] * y_scale + y_bias; 96 sfv->viewport.m32 = v[MAT_TZ] * depth_scale; 97 98 brw->state.dirty.cache |= CACHE_NEW_SF_VP; 99 } 100 101 const struct brw_tracked_state gen6_sf_vp = { 102 .dirty = { 103 .mesa = _NEW_VIEWPORT | _NEW_BUFFERS, 104 .brw = BRW_NEW_BATCH, 105 .cache = 0, 106 }, 107 .emit = gen6_upload_sf_vp, 108 }; 109 110 static void upload_viewport_state_pointers(struct brw_context *brw) 111 { 112 struct intel_context *intel = &brw->intel; 113 114 BEGIN_BATCH(4); 115 OUT_BATCH(_3DSTATE_VIEWPORT_STATE_POINTERS << 16 | (4 - 2) | 116 GEN6_CC_VIEWPORT_MODIFY | 117 GEN6_SF_VIEWPORT_MODIFY | 118 GEN6_CLIP_VIEWPORT_MODIFY); 119 OUT_BATCH(brw->clip.vp_offset); 120 OUT_BATCH(brw->sf.vp_offset); 121 OUT_BATCH(brw->cc.vp_offset); 122 ADVANCE_BATCH(); 123 } 124 125 const struct brw_tracked_state gen6_viewport_state = { 126 .dirty = { 127 .mesa = 0, 128 .brw = (BRW_NEW_BATCH | 129 BRW_NEW_STATE_BASE_ADDRESS), 130 .cache = (CACHE_NEW_CLIP_VP | 131 CACHE_NEW_SF_VP | 132 CACHE_NEW_CC_VP) 133 }, 134 .emit = upload_viewport_state_pointers, 135 }; 136