/* * Copyright © 2011 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. */ #include "brw_context.h" #include "brw_state.h" #include "brw_defines.h" #include "intel_batchbuffer.h" #include "main/fbobject.h" #include "main/viewport.h" static void gen7_upload_sf_clip_viewport(struct brw_context *brw) { struct gl_context *ctx = &brw->ctx; GLfloat y_scale, y_bias; const bool render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer); struct gen7_sf_clip_viewport *vp; vp = brw_state_batch(brw, AUB_TRACE_SF_VP_STATE, sizeof(*vp) * ctx->Const.MaxViewports, 64, &brw->sf.vp_offset); /* Also assign to clip.vp_offset in case something uses it. */ brw->clip.vp_offset = brw->sf.vp_offset; /* _NEW_BUFFERS */ if (render_to_fbo) { y_scale = 1.0; y_bias = 0; } else { y_scale = -1.0; y_bias = ctx->DrawBuffer->Height; } for (unsigned i = 0; i < ctx->Const.MaxViewports; i++) { double scale[3], translate[3]; _mesa_get_viewport_xform(ctx, i, scale, translate); /* According to the "Vertex X,Y Clamping and Quantization" section of * the Strips and Fans documentation, objects must not have a * screen-space extents of over 8192 pixels, or they may be * mis-rasterized. The maximum screen space coordinates of a small * object may larger, but we have no way to enforce the object size * other than through clipping. * * If you're surprised that we set clip to -gbx to +gbx and it seems * like we'll end up with 16384 wide, note that for a 8192-wide render * target, we'll end up with a normal (-1, 1) clip volume that just * covers the drawable. */ const float maximum_guardband_extent = 8192; const float gbx = maximum_guardband_extent / ctx->ViewportArray[i].Width; const float gby = maximum_guardband_extent / ctx->ViewportArray[i].Height; vp[i].guardband.xmin = -gbx; vp[i].guardband.xmax = gbx; vp[i].guardband.ymin = -gby; vp[i].guardband.ymax = gby; /* _NEW_VIEWPORT */ vp[i].viewport.m00 = scale[0]; vp[i].viewport.m11 = scale[1] * y_scale; vp[i].viewport.m22 = scale[2]; vp[i].viewport.m30 = translate[0]; vp[i].viewport.m31 = translate[1] * y_scale + y_bias; vp[i].viewport.m32 = translate[2]; } BEGIN_BATCH(2); OUT_BATCH(_3DSTATE_VIEWPORT_STATE_POINTERS_SF_CL << 16 | (2 - 2)); OUT_BATCH(brw->sf.vp_offset); ADVANCE_BATCH(); } const struct brw_tracked_state gen7_sf_clip_viewport = { .dirty = { .mesa = _NEW_BUFFERS | _NEW_VIEWPORT, .brw = BRW_NEW_BATCH, }, .emit = gen7_upload_sf_clip_viewport, };