| /* |
| * 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/framebuffer.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; |
| |
| /* BRW_NEW_VIEWPORT_COUNT */ |
| const unsigned viewport_count = brw->clip.viewport_count; |
| |
| vp = brw_state_batch(brw, AUB_TRACE_SF_VP_STATE, |
| sizeof(*vp) * viewport_count, 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 = 0.0; |
| } else { |
| y_scale = -1.0; |
| y_bias = (float)_mesa_geometric_height(ctx->DrawBuffer); |
| } |
| |
| for (unsigned i = 0; i < viewport_count; i++) { |
| float 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 | |
| BRW_NEW_BLORP | |
| BRW_NEW_VIEWPORT_COUNT, |
| }, |
| .emit = gen7_upload_sf_clip_viewport, |
| }; |