/*
 * Copyright © 2012 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:
 *    Chris Wilson <chris@chris-wilson.co.uk>
 *
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "sna.h"
#include "sna_render.h"
#include "sna_render_inline.h"
#include "gen4_vertex.h"

void gen4_vertex_flush(struct sna *sna)
{
	DBG(("%s[%x] = %d\n", __FUNCTION__,
	     4*sna->render.vertex_offset,
	     sna->render.vertex_index - sna->render.vertex_start));

	assert(sna->render.vertex_offset);
	assert(sna->render.vertex_index > sna->render.vertex_start);

	sna->kgem.batch[sna->render.vertex_offset] =
		sna->render.vertex_index - sna->render.vertex_start;
	sna->render.vertex_offset = 0;
}

int gen4_vertex_finish(struct sna *sna)
{
	struct kgem_bo *bo;
	unsigned int i;
	unsigned hint, size;

	DBG(("%s: used=%d / %d\n", __FUNCTION__,
	     sna->render.vertex_used, sna->render.vertex_size));
	assert(sna->render.vertex_offset == 0);
	assert(sna->render.vertex_used);

	sna_vertex_wait__locked(&sna->render);

	/* Note: we only need dword alignment (currently) */

	bo = sna->render.vbo;
	if (bo) {
		for (i = 0; i < sna->render.nvertex_reloc; i++) {
			DBG(("%s: reloc[%d] = %d\n", __FUNCTION__,
			     i, sna->render.vertex_reloc[i]));

			sna->kgem.batch[sna->render.vertex_reloc[i]] =
				kgem_add_reloc(&sna->kgem,
					       sna->render.vertex_reloc[i], bo,
					       I915_GEM_DOMAIN_VERTEX << 16,
					       0);
		}

		assert(!sna->render.active);
		sna->render.nvertex_reloc = 0;
		sna->render.vertex_used = 0;
		sna->render.vertex_index = 0;
		sna->render.vbo = NULL;
		sna->render.vb_id = 0;

		kgem_bo_destroy(&sna->kgem, bo);
	}

	hint = CREATE_GTT_MAP;
	if (bo)
		hint |= CREATE_CACHED | CREATE_NO_THROTTLE;

	size = 256*1024;
	assert(!sna->render.active);
	sna->render.vertices = NULL;
	sna->render.vbo = kgem_create_linear(&sna->kgem, size, hint);
	while (sna->render.vbo == NULL && size > 16*1024) {
		size /= 2;
		sna->render.vbo = kgem_create_linear(&sna->kgem, size, hint);
	}
	if (sna->render.vbo == NULL)
		sna->render.vbo = kgem_create_linear(&sna->kgem,
						     256*1024, CREATE_GTT_MAP);
	if (sna->render.vbo)
		sna->render.vertices = kgem_bo_map(&sna->kgem, sna->render.vbo);
	if (sna->render.vertices == NULL) {
		if (sna->render.vbo) {
			kgem_bo_destroy(&sna->kgem, sna->render.vbo);
			sna->render.vbo = NULL;
		}
		sna->render.vertices = sna->render.vertex_data;
		sna->render.vertex_size = ARRAY_SIZE(sna->render.vertex_data);
		return 0;
	}

	if (sna->render.vertex_used) {
		DBG(("%s: copying initial buffer x %d to handle=%d\n",
		     __FUNCTION__,
		     sna->render.vertex_used,
		     sna->render.vbo->handle));
		assert(sizeof(float)*sna->render.vertex_used <=
		       __kgem_bo_size(sna->render.vbo));
		memcpy(sna->render.vertices,
		       sna->render.vertex_data,
		       sizeof(float)*sna->render.vertex_used);
	}

	size = __kgem_bo_size(sna->render.vbo)/4;
	if (size >= UINT16_MAX)
		size = UINT16_MAX - 1;

	DBG(("%s: create vbo handle=%d, size=%d\n",
	     __FUNCTION__, sna->render.vbo->handle, size));

	sna->render.vertex_size = size;
	return sna->render.vertex_size - sna->render.vertex_used;
}

void gen4_vertex_close(struct sna *sna)
{
	struct kgem_bo *bo, *free_bo = NULL;
	unsigned int i, delta = 0;

	assert(sna->render.vertex_offset == 0);
	if (!sna->render.vb_id)
		return;

	DBG(("%s: used=%d, vbo active? %d, vb=%x, nreloc=%d\n",
	     __FUNCTION__, sna->render.vertex_used, sna->render.vbo ? sna->render.vbo->handle : 0,
	     sna->render.vb_id, sna->render.nvertex_reloc));

	assert(!sna->render.active);

	bo = sna->render.vbo;
	if (bo) {
		if (sna->render.vertex_size - sna->render.vertex_used < 64) {
			DBG(("%s: discarding vbo (full), handle=%d\n", __FUNCTION__, sna->render.vbo->handle));
			sna->render.vbo = NULL;
			sna->render.vertices = sna->render.vertex_data;
			sna->render.vertex_size = ARRAY_SIZE(sna->render.vertex_data);
			free_bo = bo;
		} else if (IS_CPU_MAP(bo->map) && !sna->kgem.has_llc) {
			DBG(("%s: converting CPU map to GTT\n", __FUNCTION__));
			sna->render.vertices =
				kgem_bo_map__gtt(&sna->kgem, sna->render.vbo);
			if (sna->render.vertices == NULL) {
				sna->render.vbo = NULL;
				sna->render.vertices = sna->render.vertex_data;
				sna->render.vertex_size = ARRAY_SIZE(sna->render.vertex_data);
				free_bo = bo;
			}

		}
	} else {
		if (sna->kgem.nbatch + sna->render.vertex_used <= sna->kgem.surface) {
			DBG(("%s: copy to batch: %d @ %d\n", __FUNCTION__,
			     sna->render.vertex_used, sna->kgem.nbatch));
			memcpy(sna->kgem.batch + sna->kgem.nbatch,
			       sna->render.vertex_data,
			       sna->render.vertex_used * 4);
			delta = sna->kgem.nbatch * 4;
			bo = NULL;
			sna->kgem.nbatch += sna->render.vertex_used;
		} else {
			bo = kgem_create_linear(&sna->kgem,
						4*sna->render.vertex_used,
						CREATE_NO_THROTTLE);
			if (bo && !kgem_bo_write(&sna->kgem, bo,
						 sna->render.vertex_data,
						 4*sna->render.vertex_used)) {
				kgem_bo_destroy(&sna->kgem, bo);
				bo = NULL;
			}
			DBG(("%s: new vbo: %d\n", __FUNCTION__,
			     sna->render.vertex_used));
			free_bo = bo;
		}
	}

	assert(sna->render.nvertex_reloc);
	for (i = 0; i < sna->render.nvertex_reloc; i++) {
		DBG(("%s: reloc[%d] = %d\n", __FUNCTION__,
		     i, sna->render.vertex_reloc[i]));

		sna->kgem.batch[sna->render.vertex_reloc[i]] =
			kgem_add_reloc(&sna->kgem,
				       sna->render.vertex_reloc[i], bo,
				       I915_GEM_DOMAIN_VERTEX << 16,
				       delta);
	}
	sna->render.nvertex_reloc = 0;
	sna->render.vb_id = 0;

	if (sna->render.vbo == NULL) {
		assert(!sna->render.active);
		sna->render.vertex_used = 0;
		sna->render.vertex_index = 0;
		assert(sna->render.vertices == sna->render.vertex_data);
		assert(sna->render.vertex_size == ARRAY_SIZE(sna->render.vertex_data));
	}

	if (free_bo)
		kgem_bo_destroy(&sna->kgem, free_bo);
}

/* specialised vertex emission routines */

#define OUT_VERTEX(x,y) vertex_emit_2s(sna, x,y) /* XXX assert(!too_large(x, y)); */
#define OUT_VERTEX_F(v) vertex_emit(sna, v)

inline static float
compute_linear(const struct sna_composite_channel *channel,
	       int16_t x, int16_t y)
{
	return ((x+channel->offset[0]) * channel->u.linear.dx +
		(y+channel->offset[1]) * channel->u.linear.dy +
		channel->u.linear.offset);
}

inline static void
emit_texcoord(struct sna *sna,
	      const struct sna_composite_channel *channel,
	      int16_t x, int16_t y)
{
	if (channel->is_solid) {
		OUT_VERTEX_F(x);
		return;
	}

	x += channel->offset[0];
	y += channel->offset[1];

	if (channel->is_affine) {
		float s, t;

		sna_get_transformed_coordinates(x, y,
						channel->transform,
						&s, &t);
		OUT_VERTEX_F(s * channel->scale[0]);
		OUT_VERTEX_F(t * channel->scale[1]);
	} else {
		float s, t, w;

		sna_get_transformed_coordinates_3d(x, y,
						   channel->transform,
						   &s, &t, &w);
		OUT_VERTEX_F(s * channel->scale[0]);
		OUT_VERTEX_F(t * channel->scale[1]);
		OUT_VERTEX_F(w);
	}
}

inline static void
emit_vertex(struct sna *sna,
		      const struct sna_composite_op *op,
		      int16_t srcX, int16_t srcY,
		      int16_t mskX, int16_t mskY,
		      int16_t dstX, int16_t dstY)
{
	OUT_VERTEX(dstX, dstY);
	emit_texcoord(sna, &op->src, srcX, srcY);
}

fastcall static void
emit_primitive(struct sna *sna,
	       const struct sna_composite_op *op,
	       const struct sna_composite_rectangles *r)
{
	emit_vertex(sna, op,
		    r->src.x + r->width,  r->src.y + r->height,
		    r->mask.x + r->width, r->mask.y + r->height,
		    r->dst.x + r->width, r->dst.y + r->height);
	emit_vertex(sna, op,
		    r->src.x,  r->src.y + r->height,
		    r->mask.x, r->mask.y + r->height,
		    r->dst.x,  r->dst.y + r->height);
	emit_vertex(sna, op,
		    r->src.x,  r->src.y,
		    r->mask.x, r->mask.y,
		    r->dst.x,  r->dst.y);
}

inline static void
emit_vertex_mask(struct sna *sna,
		 const struct sna_composite_op *op,
		 int16_t srcX, int16_t srcY,
		 int16_t mskX, int16_t mskY,
		 int16_t dstX, int16_t dstY)
{
	OUT_VERTEX(dstX, dstY);
	emit_texcoord(sna, &op->src, srcX, srcY);
	emit_texcoord(sna, &op->mask, mskX, mskY);
}

fastcall static void
emit_primitive_mask(struct sna *sna,
		    const struct sna_composite_op *op,
		    const struct sna_composite_rectangles *r)
{
	emit_vertex_mask(sna, op,
			 r->src.x + r->width,  r->src.y + r->height,
			 r->mask.x + r->width, r->mask.y + r->height,
			 r->dst.x + r->width, r->dst.y + r->height);
	emit_vertex_mask(sna, op,
			 r->src.x,  r->src.y + r->height,
			 r->mask.x, r->mask.y + r->height,
			 r->dst.x,  r->dst.y + r->height);
	emit_vertex_mask(sna, op,
			 r->src.x,  r->src.y,
			 r->mask.x, r->mask.y,
			 r->dst.x,  r->dst.y);
}

fastcall static void
emit_primitive_solid(struct sna *sna,
		     const struct sna_composite_op *op,
		     const struct sna_composite_rectangles *r)
{
	float *v;
	union {
		struct sna_coordinate p;
		float f;
	} dst;

	assert(op->floats_per_rect == 6);
	assert((sna->render.vertex_used % 2) == 0);
	v = sna->render.vertices + sna->render.vertex_used;
	sna->render.vertex_used += 6;
	assert(sna->render.vertex_used <= sna->render.vertex_size);

	dst.p.x = r->dst.x + r->width;
	dst.p.y = r->dst.y + r->height;
	v[0] = dst.f;
	dst.p.x = r->dst.x;
	v[2] = dst.f;
	dst.p.y = r->dst.y;
	v[4] = dst.f;

	v[5] = v[3] = v[1] = .5;
}

fastcall static void
emit_boxes_solid(const struct sna_composite_op *op,
		 const BoxRec *box, int nbox,
		 float *v)
{
	do {
		union {
			struct sna_coordinate p;
			float f;
		} dst;

		dst.p.x = box->x2;
		dst.p.y = box->y2;
		v[0] = dst.f;
		dst.p.x = box->x1;
		v[2] = dst.f;
		dst.p.y = box->y1;
		v[4] = dst.f;

		v[5] = v[3] = v[1] = .5;
		box++;
		v += 6;
	} while (--nbox);
}

fastcall static void
emit_primitive_linear(struct sna *sna,
		      const struct sna_composite_op *op,
		      const struct sna_composite_rectangles *r)
{
	float *v;
	union {
		struct sna_coordinate p;
		float f;
	} dst;

	assert(op->floats_per_rect == 6);
	assert((sna->render.vertex_used % 2) == 0);
	v = sna->render.vertices + sna->render.vertex_used;
	sna->render.vertex_used += 6;
	assert(sna->render.vertex_used <= sna->render.vertex_size);

	dst.p.x = r->dst.x + r->width;
	dst.p.y = r->dst.y + r->height;
	v[0] = dst.f;
	dst.p.x = r->dst.x;
	v[2] = dst.f;
	dst.p.y = r->dst.y;
	v[4] = dst.f;

	v[1] = compute_linear(&op->src, r->src.x+r->width, r->src.y+r->height);
	v[3] = compute_linear(&op->src, r->src.x, r->src.y+r->height);
	v[5] = compute_linear(&op->src, r->src.x, r->src.y);
}

fastcall static void
emit_boxes_linear(const struct sna_composite_op *op,
		  const BoxRec *box, int nbox,
		  float *v)
{
	union {
		struct sna_coordinate p;
		float f;
	} dst;

	do {
		dst.p.x = box->x2;
		dst.p.y = box->y2;
		v[0] = dst.f;
		dst.p.x = box->x1;
		v[2] = dst.f;
		dst.p.y = box->y1;
		v[4] = dst.f;

		v[1] = compute_linear(&op->src, box->x2, box->y2);
		v[3] = compute_linear(&op->src, box->x1, box->y2);
		v[5] = compute_linear(&op->src, box->x1, box->y1);

		v += 6;
		box++;
	} while (--nbox);
}

fastcall static void
emit_primitive_identity_source(struct sna *sna,
			       const struct sna_composite_op *op,
			       const struct sna_composite_rectangles *r)
{
	union {
		struct sna_coordinate p;
		float f;
	} dst;
	float *v;

	assert(op->floats_per_rect == 9);
	assert((sna->render.vertex_used % 3) == 0);
	v = sna->render.vertices + sna->render.vertex_used;
	sna->render.vertex_used += 9;

	dst.p.x = r->dst.x + r->width;
	dst.p.y = r->dst.y + r->height;
	v[0] = dst.f;
	dst.p.x = r->dst.x;
	v[3] = dst.f;
	dst.p.y = r->dst.y;
	v[6] = dst.f;

	v[7] = v[4] = (r->src.x + op->src.offset[0]) * op->src.scale[0];
	v[1] = v[4] + r->width * op->src.scale[0];

	v[8] = (r->src.y + op->src.offset[1]) * op->src.scale[1];
	v[5] = v[2] = v[8] + r->height * op->src.scale[1];
}

fastcall static void
emit_boxes_identity_source(const struct sna_composite_op *op,
			   const BoxRec *box, int nbox,
			   float *v)
{
	do {
		union {
			struct sna_coordinate p;
			float f;
		} dst;

		dst.p.x = box->x2;
		dst.p.y = box->y2;
		v[0] = dst.f;
		dst.p.x = box->x1;
		v[3] = dst.f;
		dst.p.y = box->y1;
		v[6] = dst.f;

		v[7] = v[4] = (box->x1 + op->src.offset[0]) * op->src.scale[0];
		v[1] = (box->x2 + op->src.offset[0]) * op->src.scale[0];

		v[8] = (box->y1 + op->src.offset[1]) * op->src.scale[1];
		v[2] = v[5] = (box->y2 + op->src.offset[1]) * op->src.scale[1];

		v += 9;
		box++;
	} while (--nbox);
}

fastcall static void
emit_primitive_simple_source(struct sna *sna,
			     const struct sna_composite_op *op,
			     const struct sna_composite_rectangles *r)
{
	float *v;
	union {
		struct sna_coordinate p;
		float f;
	} dst;

	float xx = op->src.transform->matrix[0][0];
	float x0 = op->src.transform->matrix[0][2];
	float yy = op->src.transform->matrix[1][1];
	float y0 = op->src.transform->matrix[1][2];
	float sx = op->src.scale[0];
	float sy = op->src.scale[1];
	int16_t tx = op->src.offset[0];
	int16_t ty = op->src.offset[1];

	assert(op->floats_per_rect == 9);
	assert((sna->render.vertex_used % 3) == 0);
	v = sna->render.vertices + sna->render.vertex_used;
	sna->render.vertex_used += 3*3;

	dst.p.x = r->dst.x + r->width;
	dst.p.y = r->dst.y + r->height;
	v[0] = dst.f;
	v[1] = ((r->src.x + r->width + tx) * xx + x0) * sx;
	v[5] = v[2] = ((r->src.y + r->height + ty) * yy + y0) * sy;

	dst.p.x = r->dst.x;
	v[3] = dst.f;
	v[7] = v[4] = ((r->src.x + tx) * xx + x0) * sx;

	dst.p.y = r->dst.y;
	v[6] = dst.f;
	v[8] = ((r->src.y + ty) * yy + y0) * sy;
}

fastcall static void
emit_boxes_simple_source(const struct sna_composite_op *op,
			 const BoxRec *box, int nbox,
			 float *v)
{
	float xx = op->src.transform->matrix[0][0];
	float x0 = op->src.transform->matrix[0][2];
	float yy = op->src.transform->matrix[1][1];
	float y0 = op->src.transform->matrix[1][2];
	float sx = op->src.scale[0];
	float sy = op->src.scale[1];
	int16_t tx = op->src.offset[0];
	int16_t ty = op->src.offset[1];

	do {
		union {
			struct sna_coordinate p;
			float f;
		} dst;

		dst.p.x = box->x2;
		dst.p.y = box->y2;
		v[0] = dst.f;
		v[1] = ((box->x2 + tx) * xx + x0) * sx;
		v[5] = v[2] = ((box->y2 + ty) * yy + y0) * sy;

		dst.p.x = box->x1;
		v[3] = dst.f;
		v[7] = v[4] = ((box->x1 + tx) * xx + x0) * sx;

		dst.p.y = box->y1;
		v[6] = dst.f;
		v[8] = ((box->y1 + ty) * yy + y0) * sy;

		v += 9;
		box++;
	} while (--nbox);
}

fastcall static void
emit_primitive_affine_source(struct sna *sna,
			     const struct sna_composite_op *op,
			     const struct sna_composite_rectangles *r)
{
	union {
		struct sna_coordinate p;
		float f;
	} dst;
	float *v;

	assert(op->floats_per_rect == 9);
	assert((sna->render.vertex_used % 3) == 0);
	v = sna->render.vertices + sna->render.vertex_used;
	sna->render.vertex_used += 9;

	dst.p.x = r->dst.x + r->width;
	dst.p.y = r->dst.y + r->height;
	v[0] = dst.f;
	_sna_get_transformed_scaled(op->src.offset[0] + r->src.x + r->width,
				    op->src.offset[1] + r->src.y + r->height,
				    op->src.transform, op->src.scale,
				    &v[1], &v[2]);

	dst.p.x = r->dst.x;
	v[3] = dst.f;
	_sna_get_transformed_scaled(op->src.offset[0] + r->src.x,
				    op->src.offset[1] + r->src.y + r->height,
				    op->src.transform, op->src.scale,
				    &v[4], &v[5]);

	dst.p.y = r->dst.y;
	v[6] = dst.f;
	_sna_get_transformed_scaled(op->src.offset[0] + r->src.x,
				    op->src.offset[1] + r->src.y,
				    op->src.transform, op->src.scale,
				    &v[7], &v[8]);
}

fastcall static void
emit_boxes_affine_source(const struct sna_composite_op *op,
			 const BoxRec *box, int nbox,
			 float *v)
{
	do {
		union {
			struct sna_coordinate p;
			float f;
		} dst;

		dst.p.x = box->x2;
		dst.p.y = box->y2;
		v[0] = dst.f;
		_sna_get_transformed_scaled(op->src.offset[0] + box->x2,
					    op->src.offset[1] + box->y2,
					    op->src.transform, op->src.scale,
					    &v[1], &v[2]);

		dst.p.x = box->x1;
		v[3] = dst.f;
		_sna_get_transformed_scaled(op->src.offset[0] + box->x1,
					    op->src.offset[1] + box->y2,
					    op->src.transform, op->src.scale,
					    &v[4], &v[5]);

		dst.p.y = box->y1;
		v[6] = dst.f;
		_sna_get_transformed_scaled(op->src.offset[0] + box->x1,
					    op->src.offset[1] + box->y1,
					    op->src.transform, op->src.scale,
					    &v[7], &v[8]);
		box++;
		v += 9;
	} while (--nbox);
}

fastcall static void
emit_primitive_identity_mask(struct sna *sna,
			     const struct sna_composite_op *op,
			     const struct sna_composite_rectangles *r)
{
	union {
		struct sna_coordinate p;
		float f;
	} dst;
	float msk_x, msk_y;
	float w, h;
	float *v;

	msk_x = r->mask.x + op->mask.offset[0];
	msk_y = r->mask.y + op->mask.offset[1];
	w = r->width;
	h = r->height;

	DBG(("%s: dst=(%d, %d), mask=(%f, %f) x (%f, %f)\n",
	     __FUNCTION__, r->dst.x, r->dst.y, msk_x, msk_y, w, h));

	assert(op->floats_per_rect == 12);
	assert((sna->render.vertex_used % 4) == 0);
	v = sna->render.vertices + sna->render.vertex_used;
	sna->render.vertex_used += 12;

	dst.p.x = r->dst.x + r->width;
	dst.p.y = r->dst.y + r->height;
	v[0] = dst.f;
	v[2] = (msk_x + w) * op->mask.scale[0];
	v[7] = v[3] = (msk_y + h) * op->mask.scale[1];

	dst.p.x = r->dst.x;
	v[4] = dst.f;
	v[10] = v[6] = msk_x * op->mask.scale[0];

	dst.p.y = r->dst.y;
	v[8] = dst.f;
	v[11] = msk_y * op->mask.scale[1];

	v[9] = v[5] = v[1] = .5;
}

fastcall static void
emit_boxes_identity_mask(const struct sna_composite_op *op,
			 const BoxRec *box, int nbox,
			 float *v)
{
	float msk_x = op->mask.offset[0];
	float msk_y = op->mask.offset[1];

	do {
		union {
			struct sna_coordinate p;
			float f;
		} dst;

		dst.p.x = box->x2;
		dst.p.y = box->y2;
		v[0] = dst.f;
		v[2] = (msk_x + box->x2) * op->mask.scale[0];
		v[7] = v[3] = (msk_y + box->y2) * op->mask.scale[1];

		dst.p.x = box->x1;
		v[4] = dst.f;
		v[10] = v[6] = (msk_x + box->x1) * op->mask.scale[0];

		dst.p.y = box->y1;
		v[8] = dst.f;
		v[11] = (msk_y + box->y1) * op->mask.scale[1];

		v[9] = v[5] = v[1] = .5;
		v += 12;
		box++;
	} while (--nbox);
}

fastcall static void
emit_primitive_linear_identity_mask(struct sna *sna,
				    const struct sna_composite_op *op,
				    const struct sna_composite_rectangles *r)
{
	union {
		struct sna_coordinate p;
		float f;
	} dst;
	float msk_x, msk_y;
	float w, h;
	float *v;

	msk_x = r->mask.x + op->mask.offset[0];
	msk_y = r->mask.y + op->mask.offset[1];
	w = r->width;
	h = r->height;

	DBG(("%s: dst=(%d, %d), mask=(%f, %f) x (%f, %f)\n",
	     __FUNCTION__, r->dst.x, r->dst.y, msk_x, msk_y, w, h));

	assert(op->floats_per_rect == 12);
	assert((sna->render.vertex_used % 4) == 0);
	v = sna->render.vertices + sna->render.vertex_used;
	sna->render.vertex_used += 12;

	dst.p.x = r->dst.x + r->width;
	dst.p.y = r->dst.y + r->height;
	v[0] = dst.f;
	v[2] = (msk_x + w) * op->mask.scale[0];
	v[7] = v[3] = (msk_y + h) * op->mask.scale[1];

	dst.p.x = r->dst.x;
	v[4] = dst.f;
	v[10] = v[6] = msk_x * op->mask.scale[0];

	dst.p.y = r->dst.y;
	v[8] = dst.f;
	v[11] = msk_y * op->mask.scale[1];

	v[1] = compute_linear(&op->src, r->src.x+r->width, r->src.y+r->height);
	v[5] = compute_linear(&op->src, r->src.x, r->src.y+r->height);
	v[9] = compute_linear(&op->src, r->src.x, r->src.y);
}

fastcall static void
emit_boxes_linear_identity_mask(const struct sna_composite_op *op,
				const BoxRec *box, int nbox,
				float *v)
{
	float msk_x = op->mask.offset[0];
	float msk_y = op->mask.offset[1];

	do {
		union {
			struct sna_coordinate p;
			float f;
		} dst;

		dst.p.x = box->x2;
		dst.p.y = box->y2;
		v[0] = dst.f;
		v[2] = (msk_x + box->x2) * op->mask.scale[0];
		v[7] = v[3] = (msk_y + box->y2) * op->mask.scale[1];

		dst.p.x = box->x1;
		v[4] = dst.f;
		v[10] = v[6] = (msk_x + box->x1) * op->mask.scale[0];

		dst.p.y = box->y1;
		v[8] = dst.f;
		v[11] = (msk_y + box->y1) * op->mask.scale[1];

		v[1] = compute_linear(&op->src, box->x2, box->y2);
		v[5] = compute_linear(&op->src, box->x1, box->y2);
		v[9] = compute_linear(&op->src, box->x1, box->y1);

		v += 12;
		box++;
	} while (--nbox);
}

fastcall static void
emit_primitive_identity_source_mask(struct sna *sna,
				    const struct sna_composite_op *op,
				    const struct sna_composite_rectangles *r)
{
	union {
		struct sna_coordinate p;
		float f;
	} dst;
	float src_x, src_y;
	float msk_x, msk_y;
	float w, h;
	float *v;

	src_x = r->src.x + op->src.offset[0];
	src_y = r->src.y + op->src.offset[1];
	msk_x = r->mask.x + op->mask.offset[0];
	msk_y = r->mask.y + op->mask.offset[1];
	w = r->width;
	h = r->height;

	assert(op->floats_per_rect == 15);
	assert((sna->render.vertex_used % 5) == 0);
	v = sna->render.vertices + sna->render.vertex_used;
	sna->render.vertex_used += 15;

	dst.p.x = r->dst.x + r->width;
	dst.p.y = r->dst.y + r->height;
	v[0] = dst.f;
	v[1] = (src_x + w) * op->src.scale[0];
	v[2] = (src_y + h) * op->src.scale[1];
	v[3] = (msk_x + w) * op->mask.scale[0];
	v[4] = (msk_y + h) * op->mask.scale[1];

	dst.p.x = r->dst.x;
	v[5] = dst.f;
	v[6] = src_x * op->src.scale[0];
	v[7] = v[2];
	v[8] = msk_x * op->mask.scale[0];
	v[9] = v[4];

	dst.p.y = r->dst.y;
	v[10] = dst.f;
	v[11] = v[6];
	v[12] = src_y * op->src.scale[1];
	v[13] = v[8];
	v[14] = msk_y * op->mask.scale[1];
}

fastcall static void
emit_primitive_simple_source_identity(struct sna *sna,
				      const struct sna_composite_op *op,
				      const struct sna_composite_rectangles *r)
{
	float *v;
	union {
		struct sna_coordinate p;
		float f;
	} dst;

	float xx = op->src.transform->matrix[0][0];
	float x0 = op->src.transform->matrix[0][2];
	float yy = op->src.transform->matrix[1][1];
	float y0 = op->src.transform->matrix[1][2];
	float sx = op->src.scale[0];
	float sy = op->src.scale[1];
	int16_t tx = op->src.offset[0];
	int16_t ty = op->src.offset[1];
	float msk_x = r->mask.x + op->mask.offset[0];
	float msk_y = r->mask.y + op->mask.offset[1];
	float w = r->width, h = r->height;

	assert(op->floats_per_rect == 15);
	assert((sna->render.vertex_used % 5) == 0);
	v = sna->render.vertices + sna->render.vertex_used;
	sna->render.vertex_used += 3*5;

	dst.p.x = r->dst.x + r->width;
	dst.p.y = r->dst.y + r->height;
	v[0] = dst.f;
	v[1] = ((r->src.x + r->width + tx) * xx + x0) * sx;
	v[2] = ((r->src.y + r->height + ty) * yy + y0) * sy;
	v[3] = (msk_x + w) * op->mask.scale[0];
	v[4] = (msk_y + h) * op->mask.scale[1];

	dst.p.x = r->dst.x;
	v[5] = dst.f;
	v[6] = ((r->src.x + tx) * xx + x0) * sx;
	v[7] = v[2];
	v[8] = msk_x * op->mask.scale[0];
	v[9] = v[4];

	dst.p.y = r->dst.y;
	v[10] = dst.f;
	v[11] = v[6];
	v[12] = ((r->src.y + ty) * yy + y0) * sy;
	v[13] = v[8];
	v[14] = msk_y * op->mask.scale[1];
}

fastcall static void
emit_primitive_affine_source_identity(struct sna *sna,
				      const struct sna_composite_op *op,
				      const struct sna_composite_rectangles *r)
{
	float *v;
	union {
		struct sna_coordinate p;
		float f;
	} dst;
	float msk_x = r->mask.x + op->mask.offset[0];
	float msk_y = r->mask.y + op->mask.offset[1];
	float w = r->width, h = r->height;

	assert(op->floats_per_rect == 15);
	assert((sna->render.vertex_used % 5) == 0);
	v = sna->render.vertices + sna->render.vertex_used;
	sna->render.vertex_used += 3*5;

	dst.p.x = r->dst.x + r->width;
	dst.p.y = r->dst.y + r->height;
	v[0] = dst.f;
	_sna_get_transformed_scaled(op->src.offset[0] + r->src.x + r->width,
				    op->src.offset[1] + r->src.y + r->height,
				    op->src.transform, op->src.scale,
				    &v[1], &v[2]);
	v[3] = (msk_x + w) * op->mask.scale[0];
	v[4] = (msk_y + h) * op->mask.scale[1];

	dst.p.x = r->dst.x;
	v[5] = dst.f;
	_sna_get_transformed_scaled(op->src.offset[0] + r->src.x,
				    op->src.offset[1] + r->src.y + r->height,
				    op->src.transform, op->src.scale,
				    &v[6], &v[7]);
	v[8] = msk_x * op->mask.scale[0];
	v[9] = v[4];

	dst.p.y = r->dst.y;
	v[10] = dst.f;
	_sna_get_transformed_scaled(op->src.offset[0] + r->src.x,
				    op->src.offset[1] + r->src.y,
				    op->src.transform, op->src.scale,
				    &v[11], &v[12]);
	v[13] = v[8];
	v[14] = msk_y * op->mask.scale[1];
}

inline static void
emit_composite_texcoord_affine(struct sna *sna,
			       const struct sna_composite_channel *channel,
			       int16_t x, int16_t y)
{
	float t[2];

	sna_get_transformed_coordinates(x + channel->offset[0],
					y + channel->offset[1],
					channel->transform,
					&t[0], &t[1]);
	OUT_VERTEX_F(t[0] * channel->scale[0]);
	OUT_VERTEX_F(t[1] * channel->scale[1]);
}


unsigned gen4_choose_composite_emitter(struct sna_composite_op *tmp)
{
	unsigned vb;

	if (tmp->mask.bo) {
		if (tmp->mask.transform == NULL) {
			if (tmp->src.is_solid) {
				DBG(("%s: solid, identity mask\n", __FUNCTION__));
				tmp->prim_emit = emit_primitive_identity_mask;
				tmp->emit_boxes = emit_boxes_identity_mask;
				tmp->floats_per_vertex = 4;
				vb = 1 | 2 << 2;
			} else if (tmp->src.is_linear) {
				DBG(("%s: linear, identity mask\n", __FUNCTION__));
				tmp->prim_emit = emit_primitive_linear_identity_mask;
				tmp->emit_boxes = emit_boxes_linear_identity_mask;
				tmp->floats_per_vertex = 4;
				vb = 1 | 2 << 2;
			} else if (tmp->src.transform == NULL) {
				DBG(("%s: identity source, identity mask\n", __FUNCTION__));
				tmp->prim_emit = emit_primitive_identity_source_mask;
				tmp->floats_per_vertex = 5;
				vb = 2 << 2 | 2;
			} else if (tmp->src.is_affine) {
				tmp->src.scale[0] /= tmp->src.transform->matrix[2][2];
				tmp->src.scale[1] /= tmp->src.transform->matrix[2][2];
				if (!sna_affine_transform_is_rotation(tmp->src.transform)) {
					DBG(("%s: simple src, identity mask\n", __FUNCTION__));
					tmp->prim_emit = emit_primitive_simple_source_identity;
				} else {
					DBG(("%s: affine src, identity mask\n", __FUNCTION__));
					tmp->prim_emit = emit_primitive_affine_source_identity;
				}
				tmp->floats_per_vertex = 5;
				vb = 2 << 2 | 2;
			} else {
				DBG(("%s: projective source, identity mask\n", __FUNCTION__));
				tmp->prim_emit = emit_primitive_mask;
				tmp->floats_per_vertex = 6;
				vb = 2 << 2 | 3;
			}
		} else {
			tmp->prim_emit = emit_primitive_mask;
			tmp->floats_per_vertex = 1;
			vb = 0;
			if (tmp->mask.is_solid) {
				tmp->floats_per_vertex += 1;
				vb |= 1 << 2;
			} else if (tmp->mask.is_affine) {
				tmp->floats_per_vertex += 2;
				vb |= 2 << 2;
			}else {
				tmp->floats_per_vertex += 3;
				vb |= 3 << 2;
			}
			if (tmp->src.is_solid) {
				tmp->floats_per_vertex += 1;
				vb |= 1;
			} else if (tmp->src.is_affine) {
				tmp->floats_per_vertex += 2;
				vb |= 2 ;
			}else {
				tmp->floats_per_vertex += 3;
				vb |= 3;
			}
			DBG(("%s: general mask: floats-per-vertex=%d, vb=%x\n",
			     __FUNCTION__,tmp->floats_per_vertex, vb));
		}
	} else {
		if (tmp->src.is_solid) {
			DBG(("%s: solid, no mask\n", __FUNCTION__));
			tmp->prim_emit = emit_primitive_solid;
			tmp->emit_boxes = emit_boxes_solid;
			if (tmp->src.is_opaque && tmp->op == PictOpOver)
				tmp->op = PictOpSrc;
			tmp->floats_per_vertex = 2;
			vb = 1;
		} else if (tmp->src.is_linear) {
			DBG(("%s: linear, no mask\n", __FUNCTION__));
			tmp->prim_emit = emit_primitive_linear;
			tmp->emit_boxes = emit_boxes_linear;
			tmp->floats_per_vertex = 2;
			vb = 1;
		} else if (tmp->src.transform == NULL) {
			DBG(("%s: identity src, no mask\n", __FUNCTION__));
			tmp->prim_emit = emit_primitive_identity_source;
			tmp->emit_boxes = emit_boxes_identity_source;
			tmp->floats_per_vertex = 3;
			vb = 2;
		} else if (tmp->src.is_affine) {
			tmp->src.scale[0] /= tmp->src.transform->matrix[2][2];
			tmp->src.scale[1] /= tmp->src.transform->matrix[2][2];
			if (!sna_affine_transform_is_rotation(tmp->src.transform)) {
				DBG(("%s: simple src, no mask\n", __FUNCTION__));
				tmp->prim_emit = emit_primitive_simple_source;
				tmp->emit_boxes = emit_boxes_simple_source;
			} else {
				DBG(("%s: affine src, no mask\n", __FUNCTION__));
				tmp->prim_emit = emit_primitive_affine_source;
				tmp->emit_boxes = emit_boxes_affine_source;
			}
			tmp->floats_per_vertex = 3;
			vb = 2;
		} else {
			DBG(("%s: projective src, no mask\n", __FUNCTION__));
			assert(!tmp->src.is_solid);
			tmp->prim_emit = emit_primitive;
			tmp->floats_per_vertex = 4;
			vb = 3;
		}
	}
	tmp->floats_per_rect = 3 * tmp->floats_per_vertex;

	return vb;
}

inline static void
emit_span_vertex(struct sna *sna,
		  const struct sna_composite_spans_op *op,
		  int16_t x, int16_t y)
{
	OUT_VERTEX(x, y);
	emit_texcoord(sna, &op->base.src, x, y);
}

fastcall static void
emit_composite_spans_primitive(struct sna *sna,
			       const struct sna_composite_spans_op *op,
			       const BoxRec *box,
			       float opacity)
{
	emit_span_vertex(sna, op, box->x2, box->y2);
	OUT_VERTEX_F(opacity);

	emit_span_vertex(sna, op, box->x1, box->y2);
	OUT_VERTEX_F(opacity);

	emit_span_vertex(sna, op, box->x1, box->y1);
	OUT_VERTEX_F(opacity);
}

fastcall static void
emit_span_solid(struct sna *sna,
		 const struct sna_composite_spans_op *op,
		 const BoxRec *box,
		 float opacity)
{
	float *v;
	union {
		struct sna_coordinate p;
		float f;
	} dst;

	assert(op->base.floats_per_rect == 9);
	assert((sna->render.vertex_used % 3) == 0);
	v = sna->render.vertices + sna->render.vertex_used;
	sna->render.vertex_used += 3*3;

	dst.p.x = box->x2;
	dst.p.y = box->y2;
	v[0] = dst.f;

	dst.p.x = box->x1;
	v[3] = dst.f;

	dst.p.y = box->y1;
	v[6] = dst.f;

	v[7] = v[4] = v[1] = .5;
	v[8] = v[5] = v[2] = opacity;
}

fastcall static void
emit_span_boxes_solid(const struct sna_composite_spans_op *op,
		      const struct sna_opacity_box *b,
		      int nbox, float *v)
{
	do {
		union {
			struct sna_coordinate p;
			float f;
		} dst;

		dst.p.x = b->box.x2;
		dst.p.y = b->box.y2;
		v[0] = dst.f;

		dst.p.x = b->box.x1;
		v[3] = dst.f;

		dst.p.y = b->box.y1;
		v[6] = dst.f;

		v[7] = v[4] = v[1] = .5;
		v[8] = v[5] = v[2] = b->alpha;

		v += 9;
		b++;
	} while (--nbox);
}

fastcall static void
emit_span_identity(struct sna *sna,
		    const struct sna_composite_spans_op *op,
		    const BoxRec *box,
		    float opacity)
{
	float *v;
	union {
		struct sna_coordinate p;
		float f;
	} dst;

	float sx = op->base.src.scale[0];
	float sy = op->base.src.scale[1];
	int16_t tx = op->base.src.offset[0];
	int16_t ty = op->base.src.offset[1];

	assert(op->base.floats_per_rect == 12);
	assert((sna->render.vertex_used % 4) == 0);
	v = sna->render.vertices + sna->render.vertex_used;
	sna->render.vertex_used += 3*4;
	assert(sna->render.vertex_used <= sna->render.vertex_size);

	dst.p.x = box->x2;
	dst.p.y = box->y2;
	v[0] = dst.f;
	v[1] = (box->x2 + tx) * sx;
	v[6] = v[2] = (box->y2 + ty) * sy;

	dst.p.x = box->x1;
	v[4] = dst.f;
	v[9] = v[5] = (box->x1 + tx) * sx;

	dst.p.y = box->y1;
	v[8] = dst.f;
	v[10] = (box->y1 + ty) * sy;

	v[11] = v[7] = v[3] = opacity;
}

fastcall static void
emit_span_boxes_identity(const struct sna_composite_spans_op *op,
			 const struct sna_opacity_box *b, int nbox,
			 float *v)
{
	do {
		union {
			struct sna_coordinate p;
			float f;
		} dst;

		float sx = op->base.src.scale[0];
		float sy = op->base.src.scale[1];
		int16_t tx = op->base.src.offset[0];
		int16_t ty = op->base.src.offset[1];

		dst.p.x = b->box.x2;
		dst.p.y = b->box.y2;
		v[0] = dst.f;
		v[1] = (b->box.x2 + tx) * sx;
		v[6] = v[2] = (b->box.y2 + ty) * sy;

		dst.p.x = b->box.x1;
		v[4] = dst.f;
		v[9] = v[5] = (b->box.x1 + tx) * sx;

		dst.p.y = b->box.y1;
		v[8] = dst.f;
		v[10] = (b->box.y1 + ty) * sy;

		v[11] = v[7] = v[3] = b->alpha;

		v += 12;
		b++;
	} while (--nbox);
}

fastcall static void
emit_span_simple(struct sna *sna,
		  const struct sna_composite_spans_op *op,
		  const BoxRec *box,
		  float opacity)
{
	float *v;
	union {
		struct sna_coordinate p;
		float f;
	} dst;

	float xx = op->base.src.transform->matrix[0][0];
	float x0 = op->base.src.transform->matrix[0][2];
	float yy = op->base.src.transform->matrix[1][1];
	float y0 = op->base.src.transform->matrix[1][2];
	float sx = op->base.src.scale[0];
	float sy = op->base.src.scale[1];
	int16_t tx = op->base.src.offset[0];
	int16_t ty = op->base.src.offset[1];

	assert(op->base.floats_per_rect == 12);
	assert((sna->render.vertex_used % 4) == 0);
	v = sna->render.vertices + sna->render.vertex_used;
	sna->render.vertex_used += 3*4;
	assert(sna->render.vertex_used <= sna->render.vertex_size);

	dst.p.x = box->x2;
	dst.p.y = box->y2;
	v[0] = dst.f;
	v[1] = ((box->x2 + tx) * xx + x0) * sx;
	v[6] = v[2] = ((box->y2 + ty) * yy + y0) * sy;

	dst.p.x = box->x1;
	v[4] = dst.f;
	v[9] = v[5] = ((box->x1 + tx) * xx + x0) * sx;

	dst.p.y = box->y1;
	v[8] = dst.f;
	v[10] = ((box->y1 + ty) * yy + y0) * sy;

	v[11] = v[7] = v[3] = opacity;
}

fastcall static void
emit_span_boxes_simple(const struct sna_composite_spans_op *op,
		       const struct sna_opacity_box *b, int nbox,
		       float *v)
{
	float xx = op->base.src.transform->matrix[0][0];
	float x0 = op->base.src.transform->matrix[0][2];
	float yy = op->base.src.transform->matrix[1][1];
	float y0 = op->base.src.transform->matrix[1][2];
	float sx = op->base.src.scale[0];
	float sy = op->base.src.scale[1];
	int16_t tx = op->base.src.offset[0];
	int16_t ty = op->base.src.offset[1];

	do {
		union {
			struct sna_coordinate p;
			float f;
		} dst;

		dst.p.x = b->box.x2;
		dst.p.y = b->box.y2;
		v[0] = dst.f;
		v[1] = ((b->box.x2 + tx) * xx + x0) * sx;
		v[6] = v[2] = ((b->box.y2 + ty) * yy + y0) * sy;

		dst.p.x = b->box.x1;
		v[4] = dst.f;
		v[9] = v[5] = ((b->box.x1 + tx) * xx + x0) * sx;

		dst.p.y = b->box.y1;
		v[8] = dst.f;
		v[10] = ((b->box.y1 + ty) * yy + y0) * sy;

		v[11] = v[7] = v[3] = b->alpha;

		v += 12;
		b++;
	} while (--nbox);
}

fastcall static void
emit_span_affine(struct sna *sna,
		  const struct sna_composite_spans_op *op,
		  const BoxRec *box,
		  float opacity)
{
	union {
		struct sna_coordinate p;
		float f;
	} dst;
	float *v;

	assert(op->base.floats_per_rect == 12);
	assert((sna->render.vertex_used % 4) == 0);
	v = sna->render.vertices + sna->render.vertex_used;
	sna->render.vertex_used += 12;

	dst.p.x = box->x2;
	dst.p.y = box->y2;
	v[0] = dst.f;
	_sna_get_transformed_scaled(op->base.src.offset[0] + box->x2,
				    op->base.src.offset[1] + box->y2,
				    op->base.src.transform,
				    op->base.src.scale,
				    &v[1], &v[2]);

	dst.p.x = box->x1;
	v[4] = dst.f;
	_sna_get_transformed_scaled(op->base.src.offset[0] + box->x1,
				    op->base.src.offset[1] + box->y2,
				    op->base.src.transform,
				    op->base.src.scale,
				    &v[5], &v[6]);

	dst.p.y = box->y1;
	v[8] = dst.f;
	_sna_get_transformed_scaled(op->base.src.offset[0] + box->x1,
				    op->base.src.offset[1] + box->y1,
				    op->base.src.transform,
				    op->base.src.scale,
				    &v[9], &v[10]);

	v[11] = v[7] = v[3] = opacity;
}

fastcall static void
emit_span_boxes_affine(const struct sna_composite_spans_op *op,
		       const struct sna_opacity_box *b, int nbox,
		       float *v)
{
	do {
		union {
			struct sna_coordinate p;
			float f;
		} dst;

		dst.p.x = b->box.x2;
		dst.p.y = b->box.y2;
		v[0] = dst.f;
		_sna_get_transformed_scaled(op->base.src.offset[0] + b->box.x2,
					    op->base.src.offset[1] + b->box.y2,
					    op->base.src.transform,
					    op->base.src.scale,
					    &v[1], &v[2]);

		dst.p.x = b->box.x1;
		v[4] = dst.f;
		_sna_get_transformed_scaled(op->base.src.offset[0] + b->box.x1,
					    op->base.src.offset[1] + b->box.y2,
					    op->base.src.transform,
					    op->base.src.scale,
					    &v[5], &v[6]);

		dst.p.y = b->box.y1;
		v[8] = dst.f;
		_sna_get_transformed_scaled(op->base.src.offset[0] + b->box.x1,
					    op->base.src.offset[1] + b->box.y1,
					    op->base.src.transform,
					    op->base.src.scale,
					    &v[9], &v[10]);

		v[11] = v[7] = v[3] = b->alpha;

		v += 12;
		b++;
	} while (--nbox);
}

fastcall static void
emit_span_linear(struct sna *sna,
		  const struct sna_composite_spans_op *op,
		  const BoxRec *box,
		  float opacity)
{
	union {
		struct sna_coordinate p;
		float f;
	} dst;
	float *v;

	assert(op->base.floats_per_rect == 9);
	assert((sna->render.vertex_used % 3) == 0);
	v = sna->render.vertices + sna->render.vertex_used;
	sna->render.vertex_used += 9;

	dst.p.x = box->x2;
	dst.p.y = box->y2;
	v[0] = dst.f;
	dst.p.x = box->x1;
	v[3] = dst.f;
	dst.p.y = box->y1;
	v[6] = dst.f;

	v[1] = compute_linear(&op->base.src, box->x2, box->y2);
	v[4] = compute_linear(&op->base.src, box->x1, box->y2);
	v[7] = compute_linear(&op->base.src, box->x1, box->y1);

	v[8] = v[5] = v[2] = opacity;
}

fastcall static void
emit_span_boxes_linear(const struct sna_composite_spans_op *op,
		       const struct sna_opacity_box *b, int nbox,
		       float *v)
{
	do {
		union {
			struct sna_coordinate p;
			float f;
		} dst;

		dst.p.x = b->box.x2;
		dst.p.y = b->box.y2;
		v[0] = dst.f;
		dst.p.x = b->box.x1;
		v[3] = dst.f;
		dst.p.y = b->box.y1;
		v[6] = dst.f;

		v[1] = compute_linear(&op->base.src, b->box.x2, b->box.y2);
		v[4] = compute_linear(&op->base.src, b->box.x1, b->box.y2);
		v[7] = compute_linear(&op->base.src, b->box.x1, b->box.y1);

		v[8] = v[5] = v[2] = b->alpha;

		v += 9;
		b++;
	} while (--nbox);
}

inline inline static uint32_t
gen4_choose_spans_vertex_buffer(const struct sna_composite_op *op)
{
	int id = op->src.is_solid ? 1 : 2 + !op->src.is_affine;
	DBG(("%s: id=%x (%d, 1)\n", __FUNCTION__, 1 << 2 | id, id));
	return 1 << 2 | id;
}

unsigned gen4_choose_spans_emitter(struct sna_composite_spans_op *tmp)
{
	unsigned vb;

	if (tmp->base.src.is_solid) {
		tmp->prim_emit = emit_span_solid;
		tmp->emit_boxes = emit_span_boxes_solid;
		tmp->base.floats_per_vertex = 3;
		vb = 1 << 2 | 1;
	} else if (tmp->base.src.is_linear) {
		tmp->prim_emit = emit_span_linear;
		tmp->emit_boxes = emit_span_boxes_linear;
		tmp->base.floats_per_vertex = 3;
		vb = 1 << 2 | 1;
	} else if (tmp->base.src.transform == NULL) {
		tmp->prim_emit = emit_span_identity;
		tmp->emit_boxes = emit_span_boxes_identity;
		tmp->base.floats_per_vertex = 4;
		vb = 1 << 2 | 2;
	} else if (tmp->base.is_affine) {
		tmp->base.src.scale[0] /= tmp->base.src.transform->matrix[2][2];
		tmp->base.src.scale[1] /= tmp->base.src.transform->matrix[2][2];
		if (!sna_affine_transform_is_rotation(tmp->base.src.transform)) {
			tmp->prim_emit = emit_span_simple;
			tmp->emit_boxes = emit_span_boxes_simple;
		} else {
			tmp->prim_emit = emit_span_affine;
			tmp->emit_boxes = emit_span_boxes_affine;
		}
		tmp->base.floats_per_vertex = 4;
		vb = 1 << 2 | 2;
	} else {
		tmp->prim_emit = emit_composite_spans_primitive;
		tmp->base.floats_per_vertex = 5;
		vb = 1 << 2 | 3;
	}
	tmp->base.floats_per_rect = 3 * tmp->base.floats_per_vertex;
	return vb;
}