--- /dev/null
+/*
+ * 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"
+
+static void
+gen8_upload_sf_clip_viewport(struct brw_context *brw)
+{
+ struct gl_context *ctx = &brw->ctx;
+ const GLfloat depth_scale = 1.0F / ctx->DrawBuffer->_DepthMaxF;
+ float y_scale, y_bias;
+ const bool render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
+
+ float *vp = brw_state_batch(brw, AUB_TRACE_SF_VP_STATE,
+ 16 * 4 * 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++) {
+ const GLfloat *const v = ctx->ViewportArray[i]._WindowMap.m;
+
+ /* _NEW_VIEWPORT: Viewport Matrix Elements */
+ vp[0] = v[MAT_SX]; /* m00 */
+ vp[1] = v[MAT_SY] * y_scale; /* m11 */
+ vp[2] = v[MAT_SZ] * depth_scale; /* m22 */
+ vp[3] = v[MAT_TX]; /* m30 */
+ vp[4] = v[MAT_TY] * y_scale + y_bias; /* m31 */
+ vp[5] = v[MAT_TZ] * depth_scale; /* m32 */
+
+ /* Reserved */
+ vp[6] = 0;
+ vp[7] = 0;
+
+ /* 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;
+ float gbx = maximum_guardband_extent / ctx->ViewportArray[i].Width;
+ float gby = maximum_guardband_extent / ctx->ViewportArray[i].Height;
+
+ /* _NEW_VIEWPORT: Guardband Clipping */
+ vp[8] = -gbx; /* x-min */
+ vp[9] = gbx; /* x-max */
+ vp[10] = -gby; /* y-min */
+ vp[11] = gby; /* y-max */
+
+ /* Screen Space Viewport */
+ if (render_to_fbo) {
+ vp[12] = ctx->DrawBuffer->_Xmin;
+ vp[13] = ctx->DrawBuffer->_Xmax - 1;
+ vp[14] = ctx->DrawBuffer->_Ymin;
+ vp[15] = ctx->DrawBuffer->_Ymax - 1;
+ } else {
+ vp[12] = ctx->DrawBuffer->_Xmin;
+ vp[13] = ctx->DrawBuffer->_Xmax - 1;
+ vp[14] = ctx->DrawBuffer->Height - ctx->DrawBuffer->_Ymax;
+ vp[15] = ctx->DrawBuffer->Height - ctx->DrawBuffer->_Ymin - 1;
+ }
+
+ vp += 16;
+ }
+
+ 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 gen8_sf_clip_viewport = {
+ .dirty = {
+ .mesa = _NEW_VIEWPORT | _NEW_BUFFERS,
+ .brw = BRW_NEW_BATCH,
+ .cache = 0,
+ },
+ .emit = gen8_upload_sf_clip_viewport,
+};
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