/* * 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 * */ #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" bool brw_is_drawing_points(const struct brw_context *brw) { /* Determine if the primitives *reaching the SF* are points */ /* _NEW_POLYGON */ if (brw->ctx.Polygon.FrontMode == GL_POINT || brw->ctx.Polygon.BackMode == GL_POINT) { return true; } if (brw->gs.prog_data) { /* BRW_NEW_GS_PROG_DATA */ return brw->gs.prog_data->output_topology == _3DPRIM_POINTLIST; } else if (brw->tes.prog_data) { /* BRW_NEW_TES_PROG_DATA */ return brw->tes.prog_data->output_topology == BRW_TESS_OUTPUT_TOPOLOGY_POINT; } else { /* BRW_NEW_PRIMITIVE */ return brw->primitive == _3DPRIM_POINTLIST; } } bool brw_is_drawing_lines(const struct brw_context *brw) { /* Determine if the primitives *reaching the SF* are points */ /* _NEW_POLYGON */ if (brw->ctx.Polygon.FrontMode == GL_LINE || brw->ctx.Polygon.BackMode == GL_LINE) { return true; } if (brw->gs.prog_data) { /* BRW_NEW_GS_PROG_DATA */ return brw->gs.prog_data->output_topology == _3DPRIM_LINESTRIP; } else if (brw->tes.prog_data) { /* BRW_NEW_TES_PROG_DATA */ return brw->tes.prog_data->output_topology == BRW_TESS_OUTPUT_TOPOLOGY_LINE; } else { /* BRW_NEW_PRIMITIVE */ switch (brw->primitive) { case _3DPRIM_LINELIST: case _3DPRIM_LINESTRIP: case _3DPRIM_LINELOOP: return true; } } return false; } 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_BARYCENTRIC_NONPERSPECTIVE_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; if (brw->gen == 6) { perf_debug("Rasterizer discard is currently implemented via the " "clipper; having the GS not write primitives would " "likely be faster.\n"); } } uint32_t enable; if (brw->primitive == _3DPRIM_RECTLIST) enable = 0; else enable = GEN6_CLIP_ENABLE; /* _NEW_POLYGON, * BRW_NEW_GEOMETRY_PROGRAM | BRW_NEW_TES_PROG_DATA | BRW_NEW_PRIMITIVE */ if (!brw_is_drawing_points(brw) && !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_POLYGON | _NEW_TRANSFORM, .brw = BRW_NEW_BLORP | BRW_NEW_CONTEXT | BRW_NEW_FS_PROG_DATA | BRW_NEW_GS_PROG_DATA | BRW_NEW_META_IN_PROGRESS | BRW_NEW_PRIMITIVE | BRW_NEW_RASTERIZER_DISCARD | BRW_NEW_TES_PROG_DATA | BRW_NEW_VUE_MAP_GEOM_OUT, }, .emit = upload_clip_state, };