1 files changed, 350 insertions, 0 deletions

diff --git a/src/gallium/drivers/radeon/r600_viewport.c b/src/gallium/drivers/radeon/r600_viewport.c
new file mode 100644
index 00000000000..ea558cd22de
--- /dev/null
+++ b/src/gallium/drivers/radeon/r600_viewport.c
@@ -0,0 +1,350 @@
+/*
+ * Copyright 2012 Advanced Micro Devices, Inc.
+ *
+ * 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
+ * on the rights to use, copy, modify, merge, publish, distribute, sub
+ * license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHOR(S) AND/OR THEIR SUPPLIERS 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 "r600_cs.h"
+#include "tgsi/tgsi_scan.h"
+
+#define GET_MAX_SCISSOR(rctx) (rctx->chip_class >= EVERGREEN ? 16384 : 8192)
+
+static void r600_set_scissor_states(struct pipe_context *ctx,
+				    unsigned start_slot,
+				    unsigned num_scissors,
+				    const struct pipe_scissor_state *state)
+{
+	struct r600_common_context *rctx = (struct r600_common_context *)ctx;
+	int i;
+
+	for (i = 0; i < num_scissors; i++)
+		rctx->scissors.states[start_slot + i] = state[i];
+
+	if (!rctx->scissor_enabled)
+		return;
+
+	rctx->scissors.dirty_mask |= ((1 << num_scissors) - 1) << start_slot;
+	rctx->set_atom_dirty(rctx, &rctx->scissors.atom, true);
+}
+
+/* Since the guard band disables clipping, we have to clip per-pixel
+ * using a scissor.
+ */
+static void r600_get_scissor_from_viewport(struct r600_common_context *rctx,
+					   const struct pipe_viewport_state *vp,
+					   struct r600_signed_scissor *scissor)
+{
+	int tmp;
+
+	/* Convert (-1, -1) and (1, 1) from clip space into window space. */
+	scissor->minx = -vp->scale[0] + vp->translate[0];
+	scissor->miny = -vp->scale[1] + vp->translate[1];
+	scissor->maxx = vp->scale[0] + vp->translate[0];
+	scissor->maxy = vp->scale[1] + vp->translate[1];
+
+	/* r600_draw_rectangle sets this. Disable the scissor. */
+	if (scissor->minx == -1 && scissor->miny == -1 &&
+	    scissor->maxx == 1 && scissor->maxy == 1) {
+		scissor->minx = scissor->miny = 0;
+		scissor->maxx = scissor->maxy = GET_MAX_SCISSOR(rctx);
+	}
+
+	/* Handle inverted viewports. */
+	if (scissor->minx > scissor->maxx) {
+		tmp = scissor->minx;
+		scissor->minx = scissor->maxx;
+		scissor->maxx = tmp;
+	}
+	if (scissor->miny > scissor->maxy) {
+		tmp = scissor->miny;
+		scissor->miny = scissor->maxy;
+		scissor->maxy = tmp;
+	}
+}
+
+static void r600_clamp_scissor(struct r600_common_context *rctx,
+			       struct pipe_scissor_state *out,
+			       struct r600_signed_scissor *scissor)
+{
+	unsigned max_scissor = GET_MAX_SCISSOR(rctx);
+	out->minx = CLAMP(scissor->minx, 0, max_scissor);
+	out->miny = CLAMP(scissor->miny, 0, max_scissor);
+	out->maxx = CLAMP(scissor->maxx, 0, max_scissor);
+	out->maxy = CLAMP(scissor->maxy, 0, max_scissor);
+}
+
+static void r600_clip_scissor(struct pipe_scissor_state *out,
+			      struct pipe_scissor_state *clip)
+{
+	out->minx = MAX2(out->minx, clip->minx);
+	out->miny = MAX2(out->miny, clip->miny);
+	out->maxx = MIN2(out->maxx, clip->maxx);
+	out->maxy = MIN2(out->maxy, clip->maxy);
+}
+
+static void r600_scissor_make_union(struct r600_signed_scissor *out,
+				    struct r600_signed_scissor *in)
+{
+	out->minx = MIN2(out->minx, in->minx);
+	out->miny = MIN2(out->miny, in->miny);
+	out->maxx = MAX2(out->maxx, in->maxx);
+	out->maxy = MAX2(out->maxy, in->maxy);
+}
+
+void evergreen_apply_scissor_bug_workaround(struct r600_common_context *rctx,
+					    struct pipe_scissor_state *scissor)
+{
+	if (rctx->chip_class == EVERGREEN || rctx->chip_class == CAYMAN) {
+		if (scissor->maxx == 0)
+			scissor->minx = 1;
+		if (scissor->maxy == 0)
+			scissor->miny = 1;
+
+		if (rctx->chip_class == CAYMAN &&
+		    scissor->maxx == 1 && scissor->maxy == 1)
+			scissor->maxx = 2;
+	}
+}
+
+static void r600_emit_one_scissor(struct r600_common_context *rctx,
+				  struct radeon_winsys_cs *cs,
+				  struct r600_signed_scissor *vp_scissor,
+				  struct pipe_scissor_state *scissor)
+{
+	struct pipe_scissor_state final;
+
+	r600_clamp_scissor(rctx, &final, vp_scissor);
+
+	if (scissor)
+		r600_clip_scissor(&final, scissor);
+
+	evergreen_apply_scissor_bug_workaround(rctx, &final);
+
+	radeon_emit(cs, S_028250_TL_X(final.minx) |
+			S_028250_TL_Y(final.miny) |
+			S_028250_WINDOW_OFFSET_DISABLE(1));
+	radeon_emit(cs, S_028254_BR_X(final.maxx) |
+			S_028254_BR_Y(final.maxy));
+}
+
+/* the range is [-MAX, MAX] */
+#define GET_MAX_VIEWPORT_RANGE(rctx) (rctx->chip_class >= EVERGREEN ? 32768 : 16384)
+
+static void r600_emit_guardband(struct r600_common_context *rctx,
+				struct r600_signed_scissor *vp_as_scissor)
+{
+	struct radeon_winsys_cs *cs = rctx->gfx.cs;
+	struct pipe_viewport_state vp;
+	float left, top, right, bottom, max_range, guardband_x, guardband_y;
+
+	/* Reconstruct the viewport transformation from the scissor. */
+	vp.translate[0] = (vp_as_scissor->minx + vp_as_scissor->maxx) / 2.0;
+	vp.translate[1] = (vp_as_scissor->miny + vp_as_scissor->maxy) / 2.0;
+	vp.scale[0] = vp_as_scissor->maxx - vp.translate[0];
+	vp.scale[1] = vp_as_scissor->maxy - vp.translate[1];
+
+	/* Treat a 0x0 viewport as 1x1 to prevent division by zero. */
+	if (vp_as_scissor->minx == vp_as_scissor->maxx)
+		vp.scale[0] = 0.5;
+	if (vp_as_scissor->miny == vp_as_scissor->maxy)
+		vp.scale[1] = 0.5;
+
+	/* Find the biggest guard band that is inside the supported viewport
+	 * range. The guard band is specified as a horizontal and vertical
+	 * distance from (0,0) in clip space.
+	 *
+	 * This is done by applying the inverse viewport transformation
+	 * on the viewport limits to get those limits in clip space.
+	 *
+	 * Use a limit one pixel smaller to allow for some precision error.
+	 */
+	max_range = GET_MAX_VIEWPORT_RANGE(rctx) - 1;
+	left   = (-max_range - vp.translate[0]) / vp.scale[0];
+	right  = ( max_range - vp.translate[0]) / vp.scale[0];
+	top    = (-max_range - vp.translate[1]) / vp.scale[1];
+	bottom = ( max_range - vp.translate[1]) / vp.scale[1];
+
+	assert(left <= -1 && top <= -1 && right >= 1 && bottom >= 1);
+
+	guardband_x = MIN2(-left, right);
+	guardband_y = MIN2(-top, bottom);
+
+	/* If any of the GB registers is updated, all of them must be updated. */
+	if (rctx->chip_class >= CAYMAN)
+		radeon_set_context_reg_seq(cs, CM_R_028BE8_PA_CL_GB_VERT_CLIP_ADJ, 4);
+	else
+		radeon_set_context_reg_seq(cs, R600_R_028C0C_PA_CL_GB_VERT_CLIP_ADJ, 4);
+
+	radeon_emit(cs, fui(guardband_y)); /* R_028BE8_PA_CL_GB_VERT_CLIP_ADJ */
+	radeon_emit(cs, fui(1.0));         /* R_028BEC_PA_CL_GB_VERT_DISC_ADJ */
+	radeon_emit(cs, fui(guardband_x)); /* R_028BF0_PA_CL_GB_HORZ_CLIP_ADJ */
+	radeon_emit(cs, fui(1.0));         /* R_028BF4_PA_CL_GB_HORZ_DISC_ADJ */
+}
+
+static void r600_emit_scissors(struct r600_common_context *rctx, struct r600_atom *atom)
+{
+	struct radeon_winsys_cs *cs = rctx->gfx.cs;
+	struct pipe_scissor_state *states = rctx->scissors.states;
+	unsigned mask = rctx->scissors.dirty_mask;
+	bool scissor_enabled = rctx->scissor_enabled;
+	struct r600_signed_scissor max_vp_scissor;
+	int i;
+
+	/* The simple case: Only 1 viewport is active. */
+	if (!rctx->vs_writes_viewport_index) {
+		struct r600_signed_scissor *vp = &rctx->viewports.as_scissor[0];
+
+		if (!(mask & 1))
+			return;
+
+		radeon_set_context_reg_seq(cs, R_028250_PA_SC_VPORT_SCISSOR_0_TL, 2);
+		r600_emit_one_scissor(rctx, cs, vp, scissor_enabled ? &states[0] : NULL);
+		r600_emit_guardband(rctx, vp);
+		rctx->scissors.dirty_mask &= ~1; /* clear one bit */
+		return;
+	}
+
+	/* Shaders can draw to any viewport. Make a union of all viewports. */
+	max_vp_scissor = rctx->viewports.as_scissor[0];
+	for (i = 1; i < R600_MAX_VIEWPORTS; i++)
+		r600_scissor_make_union(&max_vp_scissor,
+				      &rctx->viewports.as_scissor[i]);
+
+	while (mask) {
+		int start, count, i;
+
+		u_bit_scan_consecutive_range(&mask, &start, &count);
+
+		radeon_set_context_reg_seq(cs, R_028250_PA_SC_VPORT_SCISSOR_0_TL +
+					       start * 4 * 2, count * 2);
+		for (i = start; i < start+count; i++) {
+			r600_emit_one_scissor(rctx, cs, &rctx->viewports.as_scissor[i],
+					      scissor_enabled ? &states[i] : NULL);
+		}
+	}
+	r600_emit_guardband(rctx, &max_vp_scissor);
+	rctx->scissors.dirty_mask = 0;
+}
+
+static void r600_set_viewport_states(struct pipe_context *ctx,
+				     unsigned start_slot,
+				     unsigned num_viewports,
+				     const struct pipe_viewport_state *state)
+{
+	struct r600_common_context *rctx = (struct r600_common_context *)ctx;
+	int i;
+
+	for (i = 0; i < num_viewports; i++) {
+		unsigned index = start_slot + i;
+
+		rctx->viewports.states[index] = state[i];
+		r600_get_scissor_from_viewport(rctx, &state[i],
+					       &rctx->viewports.as_scissor[index]);
+	}
+
+	rctx->viewports.dirty_mask |= ((1 << num_viewports) - 1) << start_slot;
+	rctx->scissors.dirty_mask |= ((1 << num_viewports) - 1) << start_slot;
+	rctx->set_atom_dirty(rctx, &rctx->viewports.atom, true);
+	rctx->set_atom_dirty(rctx, &rctx->scissors.atom, true);
+}
+
+static void r600_emit_viewports(struct r600_common_context *rctx, struct r600_atom *atom)
+{
+	struct radeon_winsys_cs *cs = rctx->gfx.cs;
+	struct pipe_viewport_state *states = rctx->viewports.states;
+	unsigned mask = rctx->viewports.dirty_mask;
+
+	/* The simple case: Only 1 viewport is active. */
+	if (!rctx->vs_writes_viewport_index) {
+		if (!(mask & 1))
+			return;
+
+		radeon_set_context_reg_seq(cs, R_02843C_PA_CL_VPORT_XSCALE, 6);
+		radeon_emit(cs, fui(states[0].scale[0]));
+		radeon_emit(cs, fui(states[0].translate[0]));
+		radeon_emit(cs, fui(states[0].scale[1]));
+		radeon_emit(cs, fui(states[0].translate[1]));
+		radeon_emit(cs, fui(states[0].scale[2]));
+		radeon_emit(cs, fui(states[0].translate[2]));
+		rctx->viewports.dirty_mask &= ~1; /* clear one bit */
+		return;
+	}
+
+	while (mask) {
+		int start, count, i;
+
+		u_bit_scan_consecutive_range(&mask, &start, &count);
+
+		radeon_set_context_reg_seq(cs, R_02843C_PA_CL_VPORT_XSCALE +
+					       start * 4 * 6, count * 6);
+		for (i = start; i < start+count; i++) {
+			radeon_emit(cs, fui(states[i].scale[0]));
+			radeon_emit(cs, fui(states[i].translate[0]));
+			radeon_emit(cs, fui(states[i].scale[1]));
+			radeon_emit(cs, fui(states[i].translate[1]));
+			radeon_emit(cs, fui(states[i].scale[2]));
+			radeon_emit(cs, fui(states[i].translate[2]));
+		}
+	}
+	rctx->viewports.dirty_mask = 0;
+}
+
+void r600_set_scissor_enable(struct r600_common_context *rctx, bool enable)
+{
+	if (rctx->scissor_enabled != enable) {
+		rctx->scissor_enabled = enable;
+		rctx->scissors.dirty_mask = (1 << R600_MAX_VIEWPORTS) - 1;
+		rctx->set_atom_dirty(rctx, &rctx->scissors.atom, true);
+	}
+}
+
+/**
+ * Normally, we only emit 1 viewport and 1 scissor if no shader is using
+ * the VIEWPORT_INDEX output, and emitting the other viewports and scissors
+ * is delayed. When a shader with VIEWPORT_INDEX appears, this should be
+ * called to emit the rest.
+ */
+void r600_update_vs_writes_viewport_index(struct r600_common_context *rctx,
+					  struct tgsi_shader_info *info)
+{
+	if (!info)
+		return;
+
+	rctx->vs_writes_viewport_index = info->writes_viewport_index;
+	if (!rctx->vs_writes_viewport_index)
+		return;
+
+	if (rctx->scissors.dirty_mask)
+	    rctx->set_atom_dirty(rctx, &rctx->scissors.atom, true);
+	if (rctx->viewports.dirty_mask)
+	    rctx->set_atom_dirty(rctx, &rctx->viewports.atom, true);
+}
+
+void r600_init_viewport_functions(struct r600_common_context *rctx)
+{
+	rctx->scissors.atom.emit = r600_emit_scissors;
+	rctx->viewports.atom.emit = r600_emit_viewports;
+
+	rctx->scissors.atom.num_dw = (2 + 16 * 2) + 6;
+	rctx->viewports.atom.num_dw = 2 + 16 * 6;
+
+	rctx->b.set_scissor_states = r600_set_scissor_states;
+	rctx->b.set_viewport_states = r600_set_viewport_states;
+}