| /* |
| * Copyright © 2009 Intel Corporation |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice (including the next |
| * paragraph) shall be included in all copies or substantial portions of the |
| * Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| * IN THE SOFTWARE. |
| * |
| * Authors: |
| * Eric Anholt <eric@anholt.net> |
| * |
| */ |
| |
| #include "brw_context.h" |
| #include "brw_state.h" |
| #include "brw_defines.h" |
| #include "brw_util.h" |
| #include "intel_batchbuffer.h" |
| #include "main/fbobject.h" |
| #include "main/framebuffer.h" |
| |
| static void |
| upload_clip_state(struct brw_context *brw) |
| { |
| struct gl_context *ctx = &brw->ctx; |
| /* BRW_NEW_META_IN_PROGRESS */ |
| uint32_t dw1 = brw->meta_in_progress ? 0 : GEN6_CLIP_STATISTICS_ENABLE; |
| uint32_t dw2 = 0; |
| |
| /* _NEW_BUFFERS */ |
| struct gl_framebuffer *fb = ctx->DrawBuffer; |
| |
| /* BRW_NEW_FS_PROG_DATA */ |
| if (brw->wm.prog_data->barycentric_interp_modes & |
| BRW_WM_NONPERSPECTIVE_BARYCENTRIC_BITS) { |
| dw2 |= GEN6_CLIP_NON_PERSPECTIVE_BARYCENTRIC_ENABLE; |
| } |
| |
| dw1 |= brw->vs.prog_data->base.cull_distance_mask; |
| |
| if (brw->gen >= 7) |
| dw1 |= GEN7_CLIP_EARLY_CULL; |
| |
| if (brw->gen == 7) { |
| /* _NEW_POLYGON */ |
| if (ctx->Polygon._FrontBit == _mesa_is_user_fbo(fb)) |
| dw1 |= GEN7_CLIP_WINDING_CCW; |
| |
| if (ctx->Polygon.CullFlag) { |
| switch (ctx->Polygon.CullFaceMode) { |
| case GL_FRONT: |
| dw1 |= GEN7_CLIP_CULLMODE_FRONT; |
| break; |
| case GL_BACK: |
| dw1 |= GEN7_CLIP_CULLMODE_BACK; |
| break; |
| case GL_FRONT_AND_BACK: |
| dw1 |= GEN7_CLIP_CULLMODE_BOTH; |
| break; |
| default: |
| unreachable("Should not get here: invalid CullFlag"); |
| } |
| } else { |
| dw1 |= GEN7_CLIP_CULLMODE_NONE; |
| } |
| } |
| |
| if (brw->gen < 8 && !ctx->Transform.DepthClamp) |
| dw2 |= GEN6_CLIP_Z_TEST; |
| |
| /* _NEW_LIGHT */ |
| if (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION) { |
| dw2 |= |
| (0 << GEN6_CLIP_TRI_PROVOKE_SHIFT) | |
| (1 << GEN6_CLIP_TRIFAN_PROVOKE_SHIFT) | |
| (0 << GEN6_CLIP_LINE_PROVOKE_SHIFT); |
| } else { |
| dw2 |= |
| (2 << GEN6_CLIP_TRI_PROVOKE_SHIFT) | |
| (2 << GEN6_CLIP_TRIFAN_PROVOKE_SHIFT) | |
| (1 << GEN6_CLIP_LINE_PROVOKE_SHIFT); |
| } |
| |
| /* _NEW_TRANSFORM */ |
| dw2 |= (ctx->Transform.ClipPlanesEnabled << |
| GEN6_USER_CLIP_CLIP_DISTANCES_SHIFT); |
| if (ctx->Transform.ClipDepthMode == GL_ZERO_TO_ONE) |
| dw2 |= GEN6_CLIP_API_D3D; |
| else |
| dw2 |= GEN6_CLIP_API_OGL; |
| |
| dw2 |= GEN6_CLIP_GB_TEST; |
| |
| /* We need to disable guardband clipping if the guardband (which we always |
| * program to the maximum screen-space bounding box of 8K x 8K) will be |
| * smaller than the viewport. |
| * |
| * Closely examining the clip determination formulas in the documentation |
| * reveals that objects will be discarded entirely if they're outside the |
| * (small) guardband, even if they're within the (large) viewport: |
| * |
| * TR = TR_GB || TR_VPXY || TR_VPZ || TR_UC || TR_NEGW |
| * TA = !TR && TA_GB && TA_VPZ && TA_NEGW |
| * MC = !(TA || TR) |
| * |
| * (TA is "Trivial Accept", TR is "Trivial Reject", MC is "Must Clip".) |
| * |
| * Disabling guardband clipping removes the TR_GB condition, which means |
| * they'll be considered MC ("Must Clip") unless they're rejected for |
| * some other reason. |
| * |
| * Note that there is no TA_VPXY condition. If there were, objects entirely |
| * inside a 16384x16384 viewport would be trivially accepted, breaking the |
| * "objects must have a screenspace bounding box not exceeding 8K in the X |
| * or Y direction" restriction. Instead, they're clipped. |
| */ |
| for (unsigned i = 0; i < ctx->Const.MaxViewports; i++) { |
| if (ctx->ViewportArray[i].Width > 8192 || |
| ctx->ViewportArray[i].Height > 8192) { |
| dw2 &= ~GEN6_CLIP_GB_TEST; |
| break; |
| } |
| } |
| |
| /* If the viewport dimensions are smaller than the drawable dimensions, |
| * we have to disable guardband clipping prior to Gen8. We always program |
| * the guardband to a fixed size, which is almost always larger than the |
| * viewport. Any geometry which intersects the viewport but lies within |
| * the guardband would bypass the 3D clipping stage, so it wouldn't be |
| * clipped to the viewport. Rendering would happen beyond the viewport, |
| * but still inside the drawable. |
| * |
| * Gen8+ introduces a viewport extents test which restricts rendering to |
| * the viewport, so we can ignore this restriction. |
| */ |
| if (brw->gen < 8) { |
| const float fb_width = (float)_mesa_geometric_width(fb); |
| const float fb_height = (float)_mesa_geometric_height(fb); |
| |
| for (unsigned i = 0; i < ctx->Const.MaxViewports; i++) { |
| if (ctx->ViewportArray[i].X != 0 || |
| ctx->ViewportArray[i].Y != 0 || |
| ctx->ViewportArray[i].Width != fb_width || |
| ctx->ViewportArray[i].Height != fb_height) { |
| dw2 &= ~GEN6_CLIP_GB_TEST; |
| break; |
| } |
| } |
| } |
| |
| /* BRW_NEW_RASTERIZER_DISCARD */ |
| if (ctx->RasterDiscard) { |
| dw2 |= GEN6_CLIP_MODE_REJECT_ALL; |
| perf_debug("Rasterizer discard is currently implemented via the clipper; " |
| "%s be faster.\n", brw->gen >= 7 ? "using the SOL unit may" : |
| "having the GS not write primitives would likely"); |
| } |
| |
| uint32_t enable; |
| if (brw->primitive == _3DPRIM_RECTLIST) |
| enable = 0; |
| else |
| enable = GEN6_CLIP_ENABLE; |
| |
| if (!is_drawing_points(brw) && !is_drawing_lines(brw)) |
| dw2 |= GEN6_CLIP_XY_TEST; |
| |
| /* BRW_NEW_VUE_MAP_GEOM_OUT */ |
| const int max_vp_index = |
| (brw->vue_map_geom_out.slots_valid & VARYING_BIT_VIEWPORT) != 0 ? |
| ctx->Const.MaxViewports : 1; |
| |
| BEGIN_BATCH(4); |
| OUT_BATCH(_3DSTATE_CLIP << 16 | (4 - 2)); |
| OUT_BATCH(dw1); |
| OUT_BATCH(enable | |
| GEN6_CLIP_MODE_NORMAL | |
| dw2); |
| OUT_BATCH(U_FIXED(0.125, 3) << GEN6_CLIP_MIN_POINT_WIDTH_SHIFT | |
| U_FIXED(255.875, 3) << GEN6_CLIP_MAX_POINT_WIDTH_SHIFT | |
| (_mesa_geometric_layers(fb) > 0 ? 0 : GEN6_CLIP_FORCE_ZERO_RTAINDEX) | |
| ((max_vp_index - 1) & GEN6_CLIP_MAX_VP_INDEX_MASK)); |
| ADVANCE_BATCH(); |
| } |
| |
| const struct brw_tracked_state gen6_clip_state = { |
| .dirty = { |
| .mesa = _NEW_BUFFERS | |
| _NEW_LIGHT | |
| _NEW_TRANSFORM, |
| .brw = BRW_NEW_BLORP | |
| BRW_NEW_CONTEXT | |
| BRW_NEW_FS_PROG_DATA | |
| BRW_NEW_GEOMETRY_PROGRAM | |
| BRW_NEW_META_IN_PROGRESS | |
| BRW_NEW_PRIMITIVE | |
| BRW_NEW_RASTERIZER_DISCARD | |
| BRW_NEW_VUE_MAP_GEOM_OUT, |
| }, |
| .emit = upload_clip_state, |
| }; |
| |
| const struct brw_tracked_state gen7_clip_state = { |
| .dirty = { |
| .mesa = _NEW_BUFFERS | |
| _NEW_LIGHT | |
| _NEW_POLYGON | |
| _NEW_TRANSFORM, |
| .brw = BRW_NEW_BLORP | |
| BRW_NEW_CONTEXT | |
| BRW_NEW_FS_PROG_DATA | |
| BRW_NEW_GEOMETRY_PROGRAM | |
| BRW_NEW_META_IN_PROGRESS | |
| BRW_NEW_PRIMITIVE | |
| BRW_NEW_RASTERIZER_DISCARD | |
| BRW_NEW_VUE_MAP_GEOM_OUT, |
| }, |
| .emit = upload_clip_state, |
| }; |