/*
 * Copyright (C) 2012-2013 Rob Clark <robclark@freedesktop.org>
 *
 * 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:
 *    Rob Clark <robclark@freedesktop.org>
 */

#include "pipe/p_state.h"
#include "util/u_string.h"
#include "util/u_memory.h"
#include "util/u_prim.h"

#include "freedreno_state.h"
#include "freedreno_resource.h"

#include "fd2_draw.h"
#include "fd2_context.h"
#include "fd2_emit.h"
#include "fd2_program.h"
#include "fd2_util.h"
#include "fd2_zsa.h"


static void
emit_cacheflush(struct fd_ringbuffer *ring)
{
	unsigned i;

	for (i = 0; i < 12; i++) {
		OUT_PKT3(ring, CP_EVENT_WRITE, 1);
		OUT_RING(ring, CACHE_FLUSH);
	}
}

static void
emit_vertexbufs(struct fd_context *ctx)
{
	struct fd_vertex_stateobj *vtx = ctx->vtx.vtx;
	struct fd_vertexbuf_stateobj *vertexbuf = &ctx->vtx.vertexbuf;
	struct fd2_vertex_buf bufs[PIPE_MAX_ATTRIBS];
	unsigned i;

	if (!vtx->num_elements)
		return;

	for (i = 0; i < vtx->num_elements; i++) {
		struct pipe_vertex_element *elem = &vtx->pipe[i];
		struct pipe_vertex_buffer *vb =
				&vertexbuf->vb[elem->vertex_buffer_index];
		bufs[i].offset = vb->buffer_offset;
		bufs[i].size = fd_bo_size(fd_resource(vb->buffer.resource)->bo);
		bufs[i].prsc = vb->buffer.resource;
	}

	// NOTE I believe the 0x78 (or 0x9c in solid_vp) relates to the
	// CONST(20,0) (or CONST(26,0) in soliv_vp)

	fd2_emit_vertex_bufs(ctx->batch->draw, 0x78, bufs, vtx->num_elements);
	fd2_emit_vertex_bufs(ctx->batch->binning, 0x78, bufs, vtx->num_elements);
}

static void
draw_impl(struct fd_context *ctx, const struct pipe_draw_info *info,
		   struct fd_ringbuffer *ring, unsigned index_offset, bool binning)
{
	OUT_PKT3(ring, CP_SET_CONSTANT, 2);
	OUT_RING(ring, CP_REG(REG_A2XX_VGT_INDX_OFFSET));
	OUT_RING(ring, info->index_size ? 0 : info->start);

	OUT_PKT0(ring, REG_A2XX_TC_CNTL_STATUS, 1);
	OUT_RING(ring, A2XX_TC_CNTL_STATUS_L2_INVALIDATE);

	if (is_a20x(ctx->screen)) {
		/* wait for DMA to finish and
		 * dummy draw one triangle with indexes 0,0,0.
		 * with PRE_FETCH_CULL_ENABLE | GRP_CULL_ENABLE.
		 *
		 * this workaround is for a HW bug related to DMA alignment:
		 * it is necessary for indexed draws and possibly also
		 * draws that read binning data
		 */
		OUT_PKT3(ring, CP_WAIT_REG_EQ, 4);
		OUT_RING(ring, 0x000005d0); /* RBBM_STATUS */
		OUT_RING(ring, 0x00000000);
		OUT_RING(ring, 0x00001000); /* bit: 12: VGT_BUSY_NO_DMA */
		OUT_RING(ring, 0x00000001);

		OUT_PKT3(ring, CP_DRAW_INDX_BIN, 6);
		OUT_RING(ring, 0x00000000);
		OUT_RING(ring, 0x0003c004);
		OUT_RING(ring, 0x00000000);
		OUT_RING(ring, 0x00000003);
		OUT_RELOC(ring, fd_resource(fd2_context(ctx)->solid_vertexbuf)->bo, 64, 0, 0);
		OUT_RING(ring, 0x00000006);
	} else {
		OUT_WFI (ring);

		OUT_PKT3(ring, CP_SET_CONSTANT, 3);
		OUT_RING(ring, CP_REG(REG_A2XX_VGT_MAX_VTX_INDX));
		OUT_RING(ring, info->max_index);        /* VGT_MAX_VTX_INDX */
		OUT_RING(ring, info->min_index);        /* VGT_MIN_VTX_INDX */
	}

	/* binning shader will take offset from C64 */
	if (binning && is_a20x(ctx->screen)) {
		OUT_PKT3(ring, CP_SET_CONSTANT, 5);
		OUT_RING(ring, 0x00000180);
		OUT_RING(ring, fui(ctx->batch->num_vertices));
		OUT_RING(ring, fui(0.0f));
		OUT_RING(ring, fui(0.0f));
		OUT_RING(ring, fui(0.0f));
	}

	enum pc_di_vis_cull_mode vismode = USE_VISIBILITY;
	if (binning || info->mode == PIPE_PRIM_POINTS)
		vismode = IGNORE_VISIBILITY;

	fd_draw_emit(ctx->batch, ring, ctx->primtypes[info->mode],
				 vismode, info, index_offset);

	if (is_a20x(ctx->screen)) {
		/* not sure why this is required, but it fixes some hangs */
		OUT_WFI(ring);
	} else {
		OUT_PKT3(ring, CP_SET_CONSTANT, 2);
		OUT_RING(ring, CP_REG(REG_A2XX_UNKNOWN_2010));
		OUT_RING(ring, 0x00000000);
	}

	emit_cacheflush(ring);
}


static bool
fd2_draw_vbo(struct fd_context *ctx, const struct pipe_draw_info *pinfo,
			 unsigned index_offset)
{
	if (!ctx->prog.fs || !ctx->prog.vs)
		return false;

	if (ctx->dirty & FD_DIRTY_VTXBUF)
		emit_vertexbufs(ctx);

	if (fd_binning_enabled)
		fd2_emit_state_binning(ctx, ctx->dirty);

	fd2_emit_state(ctx, ctx->dirty);

	/* a2xx can draw only 65535 vertices at once
	 * on a22x the field in the draw command is 32bits but seems limited too
	 * using a limit of 32k because it fixes an unexplained hang
	 * 32766 works for all primitives (multiple of 2 and 3)
	 */
	if (pinfo->count > 32766) {
		static const uint16_t step_tbl[PIPE_PRIM_MAX] = {
			[0 ... PIPE_PRIM_MAX - 1]  = 32766,
			[PIPE_PRIM_LINE_STRIP]     = 32765,
			[PIPE_PRIM_TRIANGLE_STRIP] = 32764,

			/* needs more work */
			[PIPE_PRIM_TRIANGLE_FAN]   = 0,
			[PIPE_PRIM_LINE_LOOP]      = 0,
		};

		struct pipe_draw_info info = *pinfo;
		unsigned count = info.count;
		unsigned step = step_tbl[info.mode];
		unsigned num_vertices = ctx->batch->num_vertices;

		if (!step)
			return false;

		for (; count + step > 32766; count -= step) {
			info.count = MIN2(count, 32766);
			draw_impl(ctx, &info, ctx->batch->draw, index_offset, false);
			draw_impl(ctx, &info, ctx->batch->binning, index_offset, true);
			info.start += step;
			ctx->batch->num_vertices += step;
		}
		/* changing this value is a hack, restore it */
		ctx->batch->num_vertices = num_vertices;
	} else {
		draw_impl(ctx, pinfo, ctx->batch->draw, index_offset, false);
		draw_impl(ctx, pinfo, ctx->batch->binning, index_offset, true);
	}

	fd_context_all_clean(ctx);

	return true;
}

static void
clear_state(struct fd_batch *batch, struct fd_ringbuffer *ring,
	unsigned buffers, bool fast_clear)
{
	struct fd_context *ctx = batch->ctx;
	struct fd2_context *fd2_ctx = fd2_context(ctx);
	uint32_t reg;

	fd2_emit_vertex_bufs(ring, 0x9c, (struct fd2_vertex_buf[]) {
			{ .prsc = fd2_ctx->solid_vertexbuf, .size = 36 },
		}, 1);

	OUT_PKT3(ring, CP_SET_CONSTANT, 2);
	OUT_RING(ring, CP_REG(REG_A2XX_VGT_INDX_OFFSET));
	OUT_RING(ring, 0);

	fd2_program_emit(ctx, ring, &ctx->solid_prog);

	OUT_PKT0(ring, REG_A2XX_TC_CNTL_STATUS, 1);
	OUT_RING(ring, A2XX_TC_CNTL_STATUS_L2_INVALIDATE);

	if (buffers & (PIPE_CLEAR_DEPTH | PIPE_CLEAR_STENCIL)) {
		OUT_PKT3(ring, CP_SET_CONSTANT, 2);
		OUT_RING(ring, CP_REG(REG_A2XX_RB_DEPTHCONTROL));
		reg = 0;
		if (buffers & PIPE_CLEAR_DEPTH) {
			reg |= A2XX_RB_DEPTHCONTROL_ZFUNC(FUNC_ALWAYS) |
				A2XX_RB_DEPTHCONTROL_Z_ENABLE |
				A2XX_RB_DEPTHCONTROL_Z_WRITE_ENABLE |
				A2XX_RB_DEPTHCONTROL_EARLY_Z_ENABLE;
		}
		if (buffers & PIPE_CLEAR_STENCIL) {
			reg |= A2XX_RB_DEPTHCONTROL_STENCILFUNC(FUNC_ALWAYS) |
					A2XX_RB_DEPTHCONTROL_STENCIL_ENABLE |
					A2XX_RB_DEPTHCONTROL_STENCILZPASS(STENCIL_REPLACE);
		}
		OUT_RING(ring, reg);
	}

	OUT_PKT3(ring, CP_SET_CONSTANT, 2);
	OUT_RING(ring, CP_REG(REG_A2XX_RB_COLORCONTROL));
	OUT_RING(ring, A2XX_RB_COLORCONTROL_ALPHA_FUNC(FUNC_ALWAYS) |
			A2XX_RB_COLORCONTROL_BLEND_DISABLE |
			A2XX_RB_COLORCONTROL_ROP_CODE(12) |
			A2XX_RB_COLORCONTROL_DITHER_MODE(DITHER_DISABLE) |
			A2XX_RB_COLORCONTROL_DITHER_TYPE(DITHER_PIXEL));

	OUT_PKT3(ring, CP_SET_CONSTANT, 3);
	OUT_RING(ring, CP_REG(REG_A2XX_PA_CL_CLIP_CNTL));
	OUT_RING(ring, 0x00000000);        /* PA_CL_CLIP_CNTL */
	OUT_RING(ring, A2XX_PA_SU_SC_MODE_CNTL_PROVOKING_VTX_LAST |  /* PA_SU_SC_MODE_CNTL */
			A2XX_PA_SU_SC_MODE_CNTL_FRONT_PTYPE(PC_DRAW_TRIANGLES) |
			A2XX_PA_SU_SC_MODE_CNTL_BACK_PTYPE(PC_DRAW_TRIANGLES) |
			(fast_clear ? A2XX_PA_SU_SC_MODE_CNTL_MSAA_ENABLE : 0));

	if (fast_clear) {
		OUT_PKT3(ring, CP_SET_CONSTANT, 2);
		OUT_RING(ring, CP_REG(REG_A2XX_PA_SC_AA_CONFIG));
		OUT_RING(ring, A2XX_PA_SC_AA_CONFIG_MSAA_NUM_SAMPLES(3));
	}

	OUT_PKT3(ring, CP_SET_CONSTANT, 2);
	OUT_RING(ring, CP_REG(REG_A2XX_PA_SC_AA_MASK));
	OUT_RING(ring, 0x0000ffff);

	OUT_PKT3(ring, CP_SET_CONSTANT, 2);
	OUT_RING(ring, CP_REG(REG_A2XX_RB_COLOR_MASK));
	if (buffers & PIPE_CLEAR_COLOR) {
		OUT_RING(ring, A2XX_RB_COLOR_MASK_WRITE_RED |
				A2XX_RB_COLOR_MASK_WRITE_GREEN |
				A2XX_RB_COLOR_MASK_WRITE_BLUE |
				A2XX_RB_COLOR_MASK_WRITE_ALPHA);
	} else {
		OUT_RING(ring, 0x0);
	}

	OUT_PKT3(ring, CP_SET_CONSTANT, 2);
	OUT_RING(ring, CP_REG(REG_A2XX_RB_BLEND_CONTROL));
	OUT_RING(ring, 0);

	if (is_a20x(batch->ctx->screen))
		return;

	OUT_PKT3(ring, CP_SET_CONSTANT, 3);
	OUT_RING(ring, CP_REG(REG_A2XX_VGT_MAX_VTX_INDX));
	OUT_RING(ring, 3);                 /* VGT_MAX_VTX_INDX */
	OUT_RING(ring, 0);                 /* VGT_MIN_VTX_INDX */

	OUT_PKT3(ring, CP_SET_CONSTANT, 3);
	OUT_RING(ring, CP_REG(REG_A2XX_RB_STENCILREFMASK_BF));
	OUT_RING(ring, 0xff000000 | A2XX_RB_STENCILREFMASK_BF_STENCILWRITEMASK(0xff));
	OUT_RING(ring, 0xff000000 | A2XX_RB_STENCILREFMASK_STENCILWRITEMASK(0xff));

	OUT_PKT3(ring, CP_SET_CONSTANT, 2);
	OUT_RING(ring, CP_REG(REG_A2XX_A220_RB_LRZ_VSC_CONTROL));
	OUT_RING(ring, 0x00000084);

	OUT_PKT3(ring, CP_SET_CONSTANT, 2);
	OUT_RING(ring, CP_REG(REG_A2XX_VGT_VERTEX_REUSE_BLOCK_CNTL));
	OUT_RING(ring, 0x0000028f);
}

static void
clear_state_restore(struct fd_context *ctx, struct fd_ringbuffer *ring)
{
	if (is_a20x(ctx->screen))
		return;

	OUT_PKT3(ring, CP_SET_CONSTANT, 2);
	OUT_RING(ring, CP_REG(REG_A2XX_RB_COPY_CONTROL));
	OUT_RING(ring, 0x00000000);

	OUT_PKT3(ring, CP_SET_CONSTANT, 2);
	OUT_RING(ring, CP_REG(REG_A2XX_A220_RB_LRZ_VSC_CONTROL));
	OUT_RING(ring, 0x00000000);

	OUT_PKT3(ring, CP_SET_CONSTANT, 2);
	OUT_RING(ring, CP_REG(REG_A2XX_VGT_VERTEX_REUSE_BLOCK_CNTL));
	OUT_RING(ring, 0x0000003b);
}

static void
clear_fast(struct fd_batch *batch, struct fd_ringbuffer *ring,
	uint32_t color_clear, uint32_t depth_clear, unsigned patch_type)
{
	BEGIN_RING(ring, 8); /* preallocate next 2 packets (for patching) */

	/* zero values are patched in */
	OUT_PKT3(ring, CP_SET_CONSTANT, 2);
	OUT_RING(ring, CP_REG(REG_A2XX_PA_SC_SCREEN_SCISSOR_BR));
	OUT_RINGP(ring, patch_type, &batch->gmem_patches);

	OUT_PKT3(ring, CP_SET_CONSTANT, 4);
	OUT_RING(ring, CP_REG(REG_A2XX_RB_SURFACE_INFO));
	OUT_RING(ring, 0x8000 | 32);
	OUT_RING(ring, 0);
	OUT_RING(ring, 0);

	/* set fill values */
	if (!is_a20x(batch->ctx->screen)) {
		OUT_PKT3(ring, CP_SET_CONSTANT, 2);
		OUT_RING(ring, CP_REG(REG_A2XX_CLEAR_COLOR));
		OUT_RING(ring, color_clear);

		OUT_PKT3(ring, CP_SET_CONSTANT, 2);
		OUT_RING(ring, CP_REG(REG_A2XX_RB_COPY_CONTROL));
		OUT_RING(ring, A2XX_RB_COPY_CONTROL_DEPTH_CLEAR_ENABLE |
			A2XX_RB_COPY_CONTROL_CLEAR_MASK(0xf));

		OUT_PKT3(ring, CP_SET_CONSTANT, 2);
		OUT_RING(ring, CP_REG(REG_A2XX_RB_DEPTH_CLEAR));
		OUT_RING(ring, depth_clear);
	} else {
		const float sc = 1.0f / 255.0f;

		OUT_PKT3(ring, CP_SET_CONSTANT, 5);
		OUT_RING(ring, 0x00000480);
		OUT_RING(ring, fui((float) (color_clear >>  0 & 0xff) * sc));
		OUT_RING(ring, fui((float) (color_clear >>  8 & 0xff) * sc));
		OUT_RING(ring, fui((float) (color_clear >> 16 & 0xff) * sc));
		OUT_RING(ring, fui((float) (color_clear >> 24 & 0xff) * sc));

		// XXX if using float the rounding error breaks it..
		float depth = ((double) (depth_clear >> 8)) * (1.0/(double) 0xffffff);
		assert((unsigned) (((double) depth * (double) 0xffffff)) ==
			(depth_clear >> 8));

		OUT_PKT3(ring, CP_SET_CONSTANT, 3);
		OUT_RING(ring, CP_REG(REG_A2XX_PA_CL_VPORT_ZSCALE));
		OUT_RING(ring, fui(0.0f));
		OUT_RING(ring, fui(depth));

		OUT_PKT3(ring, CP_SET_CONSTANT, 3);
		OUT_RING(ring, CP_REG(REG_A2XX_RB_STENCILREFMASK_BF));
		OUT_RING(ring, 0xff000000 |
			A2XX_RB_STENCILREFMASK_BF_STENCILREF(depth_clear & 0xff) |
			A2XX_RB_STENCILREFMASK_BF_STENCILWRITEMASK(0xff));
		OUT_RING(ring, 0xff000000 |
			A2XX_RB_STENCILREFMASK_STENCILREF(depth_clear & 0xff) |
			A2XX_RB_STENCILREFMASK_STENCILWRITEMASK(0xff));
	}

	fd_draw(batch, ring, DI_PT_RECTLIST, IGNORE_VISIBILITY,
			DI_SRC_SEL_AUTO_INDEX, 3, 0, INDEX_SIZE_IGN, 0, 0, NULL);
}

static bool
fd2_clear_fast(struct fd_context *ctx, unsigned buffers,
		const union pipe_color_union *color, double depth, unsigned stencil)
{
	/* using 4x MSAA allows clearing ~2x faster
	 * then we can use higher bpp clearing to clear lower bpp
	 * 1 "pixel" can clear 64 bits (rgba8+depth24+stencil8)
	 * note: its possible to clear with 32_32_32_32 format but its not faster
	 * note: fast clear doesn't work with sysmem rendering
	 * (sysmem rendering is disabled when clear is used)
	 *
	 * we only have 16-bit / 32-bit color formats
	 * and 16-bit / 32-bit depth formats
	 * so there are only a few possible combinations
	 *
	 * if the bpp of the color/depth doesn't match
	 * we clear with depth/color individually
	 */
	struct fd2_context *fd2_ctx = fd2_context(ctx);
	struct fd_batch *batch = ctx->batch;
	struct fd_ringbuffer *ring = batch->draw;
	struct pipe_framebuffer_state *pfb = &batch->framebuffer;
	uint32_t color_clear = 0, depth_clear = 0;
	enum pipe_format format = pipe_surface_format(pfb->cbufs[0]);
	int depth_size = -1; /* -1: no clear, 0: clear 16-bit, 1: clear 32-bit */
	int color_size = -1;

	/* TODO: need to test performance on a22x */
	if (!is_a20x(ctx->screen))
		return false;

	if (buffers & PIPE_CLEAR_COLOR)
		color_size = util_format_get_blocksizebits(format) == 32;

	if (buffers & (PIPE_CLEAR_DEPTH | PIPE_CLEAR_STENCIL)) {
		/* no fast clear when clearing only one component of depth+stencil buffer */
		if (!(buffers & PIPE_CLEAR_DEPTH))
			return false;

		if ((pfb->zsbuf->format == PIPE_FORMAT_Z24_UNORM_S8_UINT ||
			 pfb->zsbuf->format == PIPE_FORMAT_S8_UINT_Z24_UNORM) &&
			 !(buffers & PIPE_CLEAR_STENCIL))
			return false;

		depth_size = fd_pipe2depth(pfb->zsbuf->format) == DEPTHX_24_8;
	}

	assert(color_size >= 0 || depth_size >= 0);

	if (color_size == 0) {
		color_clear = pack_rgba(format, color->f);
		color_clear = (color_clear << 16) | (color_clear & 0xffff);
	} else if (color_size == 1) {
		color_clear = pack_rgba(format, color->f);
	}

	if (depth_size == 0) {
		depth_clear = (uint32_t)(0xffff * depth);
		depth_clear |= depth_clear << 16;
	} else if (depth_size == 1) {
		depth_clear = (((uint32_t)(0xffffff * depth)) << 8);
		depth_clear |= (stencil & 0xff);
	}

	/* disable "window" scissor.. */
	OUT_PKT3(ring, CP_SET_CONSTANT, 3);
	OUT_RING(ring, CP_REG(REG_A2XX_PA_SC_WINDOW_SCISSOR_TL));
	OUT_RING(ring, xy2d(0, 0));
	OUT_RING(ring, xy2d(0x7fff, 0x7fff));

	/* make sure we fill all "pixels" (in SCREEN_SCISSOR) */
	OUT_PKT3(ring, CP_SET_CONSTANT, 5);
	OUT_RING(ring, CP_REG(REG_A2XX_PA_CL_VPORT_XSCALE));
	OUT_RING(ring, fui(4096.0));
	OUT_RING(ring, fui(4096.0));
	OUT_RING(ring, fui(4096.0));
	OUT_RING(ring, fui(4096.0));

	clear_state(batch, ring, ~0u, true);

	if (color_size >= 0 && depth_size != color_size)
		clear_fast(batch, ring, color_clear, color_clear, GMEM_PATCH_FASTCLEAR_COLOR);

	if (depth_size >= 0 && depth_size != color_size)
		clear_fast(batch, ring, depth_clear, depth_clear, GMEM_PATCH_FASTCLEAR_DEPTH);

	if (depth_size == color_size)
		clear_fast(batch, ring, color_clear, depth_clear, GMEM_PATCH_FASTCLEAR_COLOR_DEPTH);

	clear_state_restore(ctx, ring);

	OUT_PKT3(ring, CP_SET_CONSTANT, 2);
	OUT_RING(ring, CP_REG(REG_A2XX_PA_SC_AA_CONFIG));
	OUT_RING(ring, 0);

	/* can't patch in SCREEN_SCISSOR_BR as it can be different for each tile.
	 * MEM_WRITE the value in tile_renderprep, and use CP_LOAD_CONSTANT_CONTEXT
	 * the value is read from byte offset 60 in the given bo
	 */
	OUT_PKT3(ring, CP_LOAD_CONSTANT_CONTEXT, 3);
	OUT_RELOC(ring, fd_resource(fd2_ctx->solid_vertexbuf)->bo, 0, 0, 0);
	OUT_RING(ring, CP_REG(REG_A2XX_PA_SC_SCREEN_SCISSOR_BR));
	OUT_RING(ring, 1);

	OUT_PKT3(ring, CP_SET_CONSTANT, 4);
	OUT_RING(ring, CP_REG(REG_A2XX_RB_SURFACE_INFO));
	OUT_RINGP(ring, GMEM_PATCH_RESTORE_INFO, &batch->gmem_patches);
	OUT_RING(ring, 0);
	OUT_RING(ring, 0);
	return true;
}

static bool
fd2_clear(struct fd_context *ctx, unsigned buffers,
		const union pipe_color_union *color, double depth, unsigned stencil)
{
	struct fd_ringbuffer *ring = ctx->batch->draw;
	struct pipe_framebuffer_state *fb = &ctx->batch->framebuffer;

	if (fd2_clear_fast(ctx, buffers, color, depth, stencil))
		goto dirty;

	/* set clear value */
	if (is_a20x(ctx->screen)) {
		if (buffers & PIPE_CLEAR_COLOR) {
			/* C0 used by fragment shader */
			OUT_PKT3(ring, CP_SET_CONSTANT, 5);
			OUT_RING(ring, 0x00000480);
			OUT_RING(ring, color->ui[0]);
			OUT_RING(ring, color->ui[1]);
			OUT_RING(ring, color->ui[2]);
			OUT_RING(ring, color->ui[3]);
		}

		if (buffers & PIPE_CLEAR_DEPTH) {
			/* use viewport to set depth value */
			OUT_PKT3(ring, CP_SET_CONSTANT, 3);
			OUT_RING(ring, CP_REG(REG_A2XX_PA_CL_VPORT_ZSCALE));
			OUT_RING(ring, fui(0.0f));
			OUT_RING(ring, fui(depth));
		}

		if (buffers & PIPE_CLEAR_STENCIL) {
			OUT_PKT3(ring, CP_SET_CONSTANT, 3);
			OUT_RING(ring, CP_REG(REG_A2XX_RB_STENCILREFMASK_BF));
			OUT_RING(ring, 0xff000000 |
				A2XX_RB_STENCILREFMASK_BF_STENCILREF(stencil) |
				A2XX_RB_STENCILREFMASK_BF_STENCILWRITEMASK(0xff));
			OUT_RING(ring, 0xff000000 |
				A2XX_RB_STENCILREFMASK_STENCILREF(stencil) |
				A2XX_RB_STENCILREFMASK_STENCILWRITEMASK(0xff));
		}
	} else {
		if (buffers & PIPE_CLEAR_COLOR) {
			OUT_PKT3(ring, CP_SET_CONSTANT, 2);
			OUT_RING(ring, CP_REG(REG_A2XX_CLEAR_COLOR));
			OUT_RING(ring, pack_rgba(PIPE_FORMAT_R8G8B8A8_UNORM, color->f));
		}

		if (buffers & (PIPE_CLEAR_DEPTH | PIPE_CLEAR_STENCIL)) {
			uint32_t clear_mask, depth_clear;
			switch (fd_pipe2depth(fb->zsbuf->format)) {
			case DEPTHX_24_8:
				clear_mask = ((buffers & PIPE_CLEAR_DEPTH) ? 0xe : 0) |
					((buffers & PIPE_CLEAR_STENCIL) ? 0x1 : 0);
				depth_clear = (((uint32_t)(0xffffff * depth)) << 8) |
					(stencil & 0xff);
				break;
			case DEPTHX_16:
				clear_mask = 0xf;
				depth_clear = (uint32_t)(0xffffffff * depth);
				break;
			default:
				unreachable("invalid depth");
				break;
			}

			OUT_PKT3(ring, CP_SET_CONSTANT, 2);
			OUT_RING(ring, CP_REG(REG_A2XX_RB_COPY_CONTROL));
			OUT_RING(ring, A2XX_RB_COPY_CONTROL_DEPTH_CLEAR_ENABLE |
				A2XX_RB_COPY_CONTROL_CLEAR_MASK(clear_mask));

			OUT_PKT3(ring, CP_SET_CONSTANT, 2);
			OUT_RING(ring, CP_REG(REG_A2XX_RB_DEPTH_CLEAR));
			OUT_RING(ring, depth_clear);
		}
	}

	/* scissor state */
	OUT_PKT3(ring, CP_SET_CONSTANT, 3);
	OUT_RING(ring, CP_REG(REG_A2XX_PA_SC_WINDOW_SCISSOR_TL));
	OUT_RING(ring, xy2d(0, 0));
	OUT_RING(ring, xy2d(fb->width, fb->height));

	/* viewport state */
	OUT_PKT3(ring, CP_SET_CONSTANT, 5);
	OUT_RING(ring, CP_REG(REG_A2XX_PA_CL_VPORT_XSCALE));
	OUT_RING(ring, fui((float) fb->width / 2.0));
	OUT_RING(ring, fui((float) fb->width / 2.0));
	OUT_RING(ring, fui((float) fb->height / 2.0));
	OUT_RING(ring, fui((float) fb->height / 2.0));

	/* common state */
	clear_state(ctx->batch, ring, buffers, false);

	fd_draw(ctx->batch, ring, DI_PT_RECTLIST, IGNORE_VISIBILITY,
			DI_SRC_SEL_AUTO_INDEX, 3, 0, INDEX_SIZE_IGN, 0, 0, NULL);

	clear_state_restore(ctx, ring);

dirty:
	ctx->dirty |= FD_DIRTY_ZSA |
			FD_DIRTY_VIEWPORT |
			FD_DIRTY_RASTERIZER |
			FD_DIRTY_SAMPLE_MASK |
			FD_DIRTY_PROG |
			FD_DIRTY_CONST |
			FD_DIRTY_BLEND |
			FD_DIRTY_FRAMEBUFFER |
			FD_DIRTY_SCISSOR;

	ctx->dirty_shader[PIPE_SHADER_VERTEX]   |= FD_DIRTY_SHADER_PROG;
	ctx->dirty_shader[PIPE_SHADER_FRAGMENT] |= FD_DIRTY_SHADER_PROG | FD_DIRTY_SHADER_CONST;

	return true;
}

void
fd2_draw_init(struct pipe_context *pctx)
{
	struct fd_context *ctx = fd_context(pctx);
	ctx->draw_vbo = fd2_draw_vbo;
	ctx->clear = fd2_clear;
}