| /* |
| * 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 "intel_batchbuffer.h" |
| #include "main/fbobject.h" |
| #include "main/framebuffer.h" |
| |
| static void |
| gen6_upload_scissor_state(struct brw_context *brw) |
| { |
| struct gl_context *ctx = &brw->ctx; |
| const bool render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer); |
| struct gen6_scissor_rect *scissor; |
| uint32_t scissor_state_offset; |
| const unsigned int fb_width= _mesa_geometric_width(ctx->DrawBuffer); |
| const unsigned int fb_height = _mesa_geometric_height(ctx->DrawBuffer); |
| |
| scissor = brw_state_batch(brw, AUB_TRACE_SCISSOR_STATE, |
| sizeof(*scissor) * ctx->Const.MaxViewports, 32, |
| &scissor_state_offset); |
| |
| /* _NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT */ |
| |
| /* The scissor only needs to handle the intersection of drawable and |
| * scissor rect. Clipping to the boundaries of static shared buffers |
| * for front/back/depth is covered by looping over cliprects in brw_draw.c. |
| * |
| * Note that the hardware's coordinates are inclusive, while Mesa's min is |
| * inclusive but max is exclusive. |
| */ |
| for (unsigned i = 0; i < ctx->Const.MaxViewports; i++) { |
| int bbox[4]; |
| |
| bbox[0] = MAX2(ctx->ViewportArray[i].X, 0); |
| bbox[1] = MIN2(bbox[0] + ctx->ViewportArray[i].Width, fb_width); |
| bbox[2] = MAX2(ctx->ViewportArray[i].Y, 0); |
| bbox[3] = MIN2(bbox[2] + ctx->ViewportArray[i].Height, fb_height); |
| _mesa_intersect_scissor_bounding_box(ctx, i, bbox); |
| |
| if (bbox[0] == bbox[1] || bbox[2] == bbox[3]) { |
| /* If the scissor was out of bounds and got clamped to 0 width/height |
| * at the bounds, the subtraction of 1 from maximums could produce a |
| * negative number and thus not clip anything. Instead, just provide |
| * a min > max scissor inside the bounds, which produces the expected |
| * no rendering. |
| */ |
| scissor[i].xmin = 1; |
| scissor[i].xmax = 0; |
| scissor[i].ymin = 1; |
| scissor[i].ymax = 0; |
| } else if (render_to_fbo) { |
| /* texmemory: Y=0=bottom */ |
| scissor[i].xmin = bbox[0]; |
| scissor[i].xmax = bbox[1] - 1; |
| scissor[i].ymin = bbox[2]; |
| scissor[i].ymax = bbox[3] - 1; |
| } |
| else { |
| /* memory: Y=0=top */ |
| scissor[i].xmin = bbox[0]; |
| scissor[i].xmax = bbox[1] - 1; |
| scissor[i].ymin = fb_height - bbox[3]; |
| scissor[i].ymax = fb_height - bbox[2] - 1; |
| } |
| } |
| BEGIN_BATCH(2); |
| OUT_BATCH(_3DSTATE_SCISSOR_STATE_POINTERS << 16 | (2 - 2)); |
| OUT_BATCH(scissor_state_offset); |
| ADVANCE_BATCH(); |
| } |
| |
| const struct brw_tracked_state gen6_scissor_state = { |
| .dirty = { |
| .mesa = _NEW_BUFFERS | |
| _NEW_SCISSOR | |
| _NEW_VIEWPORT, |
| .brw = BRW_NEW_BATCH | |
| BRW_NEW_BLORP, |
| }, |
| .emit = gen6_upload_scissor_state, |
| }; |