/*
 * Copyright 2010 Jerome Glisse <glisse@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
 * 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 <stdio.h>
#include <errno.h>
#include "pipe/p_defines.h"
#include "pipe/p_state.h"
#include "pipe/p_context.h"
#include "tgsi/tgsi_scan.h"
#include "tgsi/tgsi_parse.h"
#include "tgsi/tgsi_util.h"
#include "util/u_blitter.h"
#include "util/u_double_list.h"
#include "util/u_format.h"
#include "util/u_format_s3tc.h"
#include "util/u_transfer.h"
#include "util/u_surface.h"
#include "util/u_pack_color.h"
#include "util/u_memory.h"
#include "util/u_inlines.h"
#include "util/u_upload_mgr.h"
#include "vl/vl_decoder.h"
#include "vl/vl_video_buffer.h"
#include "os/os_time.h"
#include "pipebuffer/pb_buffer.h"
#include "r600.h"
#include "sid.h"
#include "r600_resource.h"
#include "radeonsi_pipe.h"
#include "r600_hw_context_priv.h"

/*
 * pipe_context
 */
static struct r600_fence *r600_create_fence(struct r600_context *rctx)
{
	struct r600_screen *rscreen = rctx->screen;
	struct r600_fence *fence = NULL;

	pipe_mutex_lock(rscreen->fences.mutex);

	if (!rscreen->fences.bo) {
		/* Create the shared buffer object */
		rscreen->fences.bo = (struct r600_resource*)
			pipe_buffer_create(&rscreen->screen, PIPE_BIND_CUSTOM,
					   PIPE_USAGE_STAGING, 4096);
		if (!rscreen->fences.bo) {
			R600_ERR("r600: failed to create bo for fence objects\n");
			goto out;
		}
		rscreen->fences.data = rctx->ws->buffer_map(rscreen->fences.bo->cs_buf,
							   rctx->cs,
							   PIPE_TRANSFER_READ_WRITE);
	}

	if (!LIST_IS_EMPTY(&rscreen->fences.pool)) {
		struct r600_fence *entry;

		/* Try to find a freed fence that has been signalled */
		LIST_FOR_EACH_ENTRY(entry, &rscreen->fences.pool, head) {
			if (rscreen->fences.data[entry->index] != 0) {
				LIST_DELINIT(&entry->head);
				fence = entry;
				break;
			}
		}
	}

	if (!fence) {
		/* Allocate a new fence */
		struct r600_fence_block *block;
		unsigned index;

		if ((rscreen->fences.next_index + 1) >= 1024) {
			R600_ERR("r600: too many concurrent fences\n");
			goto out;
		}

		index = rscreen->fences.next_index++;

		if (!(index % FENCE_BLOCK_SIZE)) {
			/* Allocate a new block */
			block = CALLOC_STRUCT(r600_fence_block);
			if (block == NULL)
				goto out;

			LIST_ADD(&block->head, &rscreen->fences.blocks);
		} else {
			block = LIST_ENTRY(struct r600_fence_block, rscreen->fences.blocks.next, head);
		}

		fence = &block->fences[index % FENCE_BLOCK_SIZE];
		fence->index = index;
	}

	pipe_reference_init(&fence->reference, 1);

	rscreen->fences.data[fence->index] = 0;
	r600_context_emit_fence(rctx, rscreen->fences.bo, fence->index, 1);

	/* Create a dummy BO so that fence_finish without a timeout can sleep waiting for completion */
	fence->sleep_bo = (struct r600_resource*)
			pipe_buffer_create(&rctx->screen->screen, PIPE_BIND_CUSTOM,
					   PIPE_USAGE_STAGING, 1);
	/* Add the fence as a dummy relocation. */
	r600_context_bo_reloc(rctx, fence->sleep_bo, RADEON_USAGE_READWRITE);

out:
	pipe_mutex_unlock(rscreen->fences.mutex);
	return fence;
}


void radeonsi_flush(struct pipe_context *ctx, struct pipe_fence_handle **fence,
		    unsigned flags)
{
	struct r600_context *rctx = (struct r600_context *)ctx;
	struct r600_fence **rfence = (struct r600_fence**)fence;
	struct pipe_query *render_cond = NULL;
	unsigned render_cond_mode = 0;

	if (rfence)
		*rfence = r600_create_fence(rctx);

	/* Disable render condition. */
	if (rctx->current_render_cond) {
		render_cond = rctx->current_render_cond;
		render_cond_mode = rctx->current_render_cond_mode;
		ctx->render_condition(ctx, NULL, 0);
	}

	r600_context_flush(rctx, flags);

	/* Re-enable render condition. */
	if (render_cond) {
		ctx->render_condition(ctx, render_cond, render_cond_mode);
	}
}

static void r600_flush_from_st(struct pipe_context *ctx,
			       struct pipe_fence_handle **fence)
{
	radeonsi_flush(ctx, fence, 0);
}

static void r600_flush_from_winsys(void *ctx, unsigned flags)
{
	radeonsi_flush((struct pipe_context*)ctx, NULL, flags);
}

static void r600_destroy_context(struct pipe_context *context)
{
	struct r600_context *rctx = (struct r600_context *)context;

	rctx->context.delete_depth_stencil_alpha_state(&rctx->context, rctx->custom_dsa_flush);
	util_unreference_framebuffer_state(&rctx->framebuffer);

	r600_context_fini(rctx);

	util_blitter_destroy(rctx->blitter);

	for (int i = 0; i < R600_PIPE_NSTATES; i++) {
		free(rctx->states[i]);
	}

	if (rctx->uploader) {
		u_upload_destroy(rctx->uploader);
	}
	util_slab_destroy(&rctx->pool_transfers);
	FREE(rctx);
}

static struct pipe_context *r600_create_context(struct pipe_screen *screen, void *priv)
{
	struct r600_context *rctx = CALLOC_STRUCT(r600_context);
	struct r600_screen* rscreen = (struct r600_screen *)screen;

	if (rctx == NULL)
		return NULL;

	rctx->context.screen = screen;
	rctx->context.priv = priv;
	rctx->context.destroy = r600_destroy_context;
	rctx->context.flush = r600_flush_from_st;

	/* Easy accessing of screen/winsys. */
	rctx->screen = rscreen;
	rctx->ws = rscreen->ws;
	rctx->family = rscreen->family;
	rctx->chip_class = rscreen->chip_class;

	r600_init_blit_functions(rctx);
	r600_init_query_functions(rctx);
	r600_init_context_resource_functions(rctx);
	r600_init_surface_functions(rctx);
	rctx->context.draw_vbo = r600_draw_vbo;

	rctx->context.create_video_decoder = vl_create_decoder;
	rctx->context.create_video_buffer = vl_video_buffer_create;

	r600_init_common_atoms(rctx);

	switch (rctx->chip_class) {
	case TAHITI:
		cayman_init_state_functions(rctx);
		if (si_context_init(rctx)) {
			r600_destroy_context(&rctx->context);
			return NULL;
		}
		si_init_config(rctx);
		rctx->custom_dsa_flush = cayman_create_db_flush_dsa(rctx);
		break;
	default:
		R600_ERR("Unsupported chip class %d.\n", rctx->chip_class);
		r600_destroy_context(&rctx->context);
		return NULL;
	}

	rctx->ws->cs_set_flush_callback(rctx->cs, r600_flush_from_winsys, rctx);

	util_slab_create(&rctx->pool_transfers,
			 sizeof(struct pipe_transfer), 64,
			 UTIL_SLAB_SINGLETHREADED);

        rctx->uploader = u_upload_create(&rctx->context, 1024 * 1024, 256,
                                         PIPE_BIND_INDEX_BUFFER |
                                         PIPE_BIND_CONSTANT_BUFFER);
        if (!rctx->uploader) {
		r600_destroy_context(&rctx->context);
		return NULL;
	}

	rctx->blitter = util_blitter_create(&rctx->context);
	if (rctx->blitter == NULL) {
		r600_destroy_context(&rctx->context);
		return NULL;
	}

	LIST_INITHEAD(&rctx->dirty_states);

	r600_get_backend_mask(rctx); /* this emits commands and must be last */

	return &rctx->context;
}

/*
 * pipe_screen
 */
static const char* r600_get_vendor(struct pipe_screen* pscreen)
{
	return "X.Org";
}

static const char *r600_get_family_name(enum radeon_family family)
{
	switch(family) {
	case CHIP_TAHITI: return "AMD TAHITI";
	case CHIP_PITCAIRN: return "AMD PITCAIRN";
	case CHIP_VERDE: return "AMD CAPE VERDE";
	default: return "AMD unknown";
	}
}

static const char* r600_get_name(struct pipe_screen* pscreen)
{
	struct r600_screen *rscreen = (struct r600_screen *)pscreen;

	return r600_get_family_name(rscreen->family);
}

static int r600_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
{
	struct r600_screen *rscreen = (struct r600_screen *)pscreen;
	enum radeon_family family = rscreen->family;

	switch (param) {
	/* Supported features (boolean caps). */
	case PIPE_CAP_NPOT_TEXTURES:
	case PIPE_CAP_TWO_SIDED_STENCIL:
	case PIPE_CAP_MAX_DUAL_SOURCE_RENDER_TARGETS:
	case PIPE_CAP_ANISOTROPIC_FILTER:
	case PIPE_CAP_POINT_SPRITE:
	case PIPE_CAP_OCCLUSION_QUERY:
	case PIPE_CAP_TEXTURE_SHADOW_MAP:
	case PIPE_CAP_TEXTURE_MIRROR_CLAMP:
	case PIPE_CAP_BLEND_EQUATION_SEPARATE:
	case PIPE_CAP_TEXTURE_SWIZZLE:
	case PIPE_CAP_DEPTHSTENCIL_CLEAR_SEPARATE:
	case PIPE_CAP_DEPTH_CLIP_DISABLE:
	case PIPE_CAP_SHADER_STENCIL_EXPORT:
	case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
	case PIPE_CAP_MIXED_COLORBUFFER_FORMATS:
	case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
	case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
	case PIPE_CAP_SM3:
	case PIPE_CAP_SEAMLESS_CUBE_MAP:
	case PIPE_CAP_PRIMITIVE_RESTART:
	case PIPE_CAP_CONDITIONAL_RENDER:
	case PIPE_CAP_TEXTURE_BARRIER:
	case PIPE_CAP_INDEP_BLEND_ENABLE:
	case PIPE_CAP_INDEP_BLEND_FUNC:
	case PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE:
	case PIPE_CAP_VERTEX_COLOR_UNCLAMPED:
	case PIPE_CAP_VERTEX_BUFFER_OFFSET_4BYTE_ALIGNED_ONLY:
	case PIPE_CAP_VERTEX_BUFFER_STRIDE_4BYTE_ALIGNED_ONLY:
	case PIPE_CAP_VERTEX_ELEMENT_SRC_OFFSET_4BYTE_ALIGNED_ONLY:
	case PIPE_CAP_USER_INDEX_BUFFERS:
	case PIPE_CAP_USER_CONSTANT_BUFFERS:
		return 1;

	case PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT:
		return 256;

	case PIPE_CAP_GLSL_FEATURE_LEVEL:
		return debug_get_bool_option("R600_GLSL130", FALSE) ? 130 : 120;

	/* Unsupported features. */
	case PIPE_CAP_TGSI_INSTANCEID:
	case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
	case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
	case PIPE_CAP_SCALED_RESOLVE:
	case PIPE_CAP_TGSI_CAN_COMPACT_VARYINGS:
	case PIPE_CAP_TGSI_CAN_COMPACT_CONSTANTS:
	case PIPE_CAP_FRAGMENT_COLOR_CLAMPED:
	case PIPE_CAP_VERTEX_COLOR_CLAMPED:
	case PIPE_CAP_QUADS_FOLLOW_PROVOKING_VERTEX_CONVENTION:
	case PIPE_CAP_USER_VERTEX_BUFFERS:
		return 0;

	/* Stream output. */
	case PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS:
		return debug_get_bool_option("R600_STREAMOUT", FALSE) ? 4 : 0;
	case PIPE_CAP_STREAM_OUTPUT_PAUSE_RESUME:
		return debug_get_bool_option("R600_STREAMOUT", FALSE) ? 1 : 0;
	case PIPE_CAP_MAX_STREAM_OUTPUT_SEPARATE_COMPONENTS:
	case PIPE_CAP_MAX_STREAM_OUTPUT_INTERLEAVED_COMPONENTS:
		return 16*4;

	/* Texturing. */
	case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
	case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
	case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
			return 15;
	case PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS:
		return rscreen->info.drm_minor >= 9 ? 16384 : 0;
	case PIPE_CAP_MAX_COMBINED_SAMPLERS:
		return 32;

	/* Render targets. */
	case PIPE_CAP_MAX_RENDER_TARGETS:
		/* FIXME some r6xx are buggy and can only do 4 */
		return 8;

	/* Timer queries, present when the clock frequency is non zero. */
	case PIPE_CAP_TIMER_QUERY:
		return rscreen->info.r600_clock_crystal_freq != 0;

	case PIPE_CAP_MIN_TEXEL_OFFSET:
		return -8;

	case PIPE_CAP_MAX_TEXEL_OFFSET:
		return 7;
	}
	return 0;
}

static float r600_get_paramf(struct pipe_screen* pscreen,
			     enum pipe_capf param)
{
	struct r600_screen *rscreen = (struct r600_screen *)pscreen;
	enum radeon_family family = rscreen->family;

	switch (param) {
	case PIPE_CAPF_MAX_LINE_WIDTH:
	case PIPE_CAPF_MAX_LINE_WIDTH_AA:
	case PIPE_CAPF_MAX_POINT_WIDTH:
	case PIPE_CAPF_MAX_POINT_WIDTH_AA:
		return 16384.0f;
	case PIPE_CAPF_MAX_TEXTURE_ANISOTROPY:
		return 16.0f;
	case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
		return 16.0f;
	case PIPE_CAPF_GUARD_BAND_LEFT:
	case PIPE_CAPF_GUARD_BAND_TOP:
	case PIPE_CAPF_GUARD_BAND_RIGHT:
	case PIPE_CAPF_GUARD_BAND_BOTTOM:
		return 0.0f;
	}
	return 0.0f;
}

static int r600_get_shader_param(struct pipe_screen* pscreen, unsigned shader, enum pipe_shader_cap param)
{
	struct r600_screen *rscreen = (struct r600_screen *)pscreen;
	switch(shader)
	{
	case PIPE_SHADER_FRAGMENT:
	case PIPE_SHADER_VERTEX:
		break;
	case PIPE_SHADER_GEOMETRY:
		/* TODO: support and enable geometry programs */
		return 0;
	default:
		/* TODO: support tessellation */
		return 0;
	}

	/* TODO: all these should be fixed, since r600 surely supports much more! */
	switch (param) {
	case PIPE_SHADER_CAP_MAX_INSTRUCTIONS:
	case PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS:
	case PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS:
	case PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS:
		return 16384;
	case PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH:
		return 8; /* FIXME */
	case PIPE_SHADER_CAP_MAX_INPUTS:
		if(shader == PIPE_SHADER_FRAGMENT)
			return 34;
		else
			return 32;
	case PIPE_SHADER_CAP_MAX_TEMPS:
		return 256; /* Max native temporaries. */
	case PIPE_SHADER_CAP_MAX_ADDRS:
		/* FIXME Isn't this equal to TEMPS? */
		return 1; /* Max native address registers */
	case PIPE_SHADER_CAP_MAX_CONSTS:
		return R600_MAX_CONST_BUFFER_SIZE;
	case PIPE_SHADER_CAP_MAX_CONST_BUFFERS:
		return R600_MAX_CONST_BUFFERS;
	case PIPE_SHADER_CAP_MAX_PREDS:
		return 0; /* FIXME */
	case PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED:
		return 1;
	case PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR:
	case PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR:
	case PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR:
	case PIPE_SHADER_CAP_INDIRECT_CONST_ADDR:
	case PIPE_SHADER_CAP_INTEGERS:
		return 0;
	case PIPE_SHADER_CAP_SUBROUTINES:
		return 0;
	case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
		return 16;
	}
	return 0;
}

static int r600_get_video_param(struct pipe_screen *screen,
				enum pipe_video_profile profile,
				enum pipe_video_cap param)
{
	switch (param) {
	case PIPE_VIDEO_CAP_SUPPORTED:
		return vl_profile_supported(screen, profile);
	case PIPE_VIDEO_CAP_NPOT_TEXTURES:
		return 1;
	case PIPE_VIDEO_CAP_MAX_WIDTH:
	case PIPE_VIDEO_CAP_MAX_HEIGHT:
		return vl_video_buffer_max_size(screen);
	case PIPE_VIDEO_CAP_PREFERED_FORMAT:
		return PIPE_FORMAT_NV12;
	default:
		return 0;
	}
}

static void r600_destroy_screen(struct pipe_screen* pscreen)
{
	struct r600_screen *rscreen = (struct r600_screen *)pscreen;

	if (rscreen == NULL)
		return;

	if (rscreen->fences.bo) {
		struct r600_fence_block *entry, *tmp;

		LIST_FOR_EACH_ENTRY_SAFE(entry, tmp, &rscreen->fences.blocks, head) {
			LIST_DEL(&entry->head);
			FREE(entry);
		}

		rscreen->ws->buffer_unmap(rscreen->fences.bo->cs_buf);
		pipe_resource_reference((struct pipe_resource**)&rscreen->fences.bo, NULL);
	}
	pipe_mutex_destroy(rscreen->fences.mutex);

	rscreen->ws->destroy(rscreen->ws);
	FREE(rscreen);
}

static void r600_fence_reference(struct pipe_screen *pscreen,
                                 struct pipe_fence_handle **ptr,
                                 struct pipe_fence_handle *fence)
{
	struct r600_fence **oldf = (struct r600_fence**)ptr;
	struct r600_fence *newf = (struct r600_fence*)fence;

	if (pipe_reference(&(*oldf)->reference, &newf->reference)) {
		struct r600_screen *rscreen = (struct r600_screen *)pscreen;
		pipe_mutex_lock(rscreen->fences.mutex);
		pipe_resource_reference((struct pipe_resource**)&(*oldf)->sleep_bo, NULL);
		LIST_ADDTAIL(&(*oldf)->head, &rscreen->fences.pool);
		pipe_mutex_unlock(rscreen->fences.mutex);
	}

	*ptr = fence;
}

static boolean r600_fence_signalled(struct pipe_screen *pscreen,
                                    struct pipe_fence_handle *fence)
{
	struct r600_screen *rscreen = (struct r600_screen *)pscreen;
	struct r600_fence *rfence = (struct r600_fence*)fence;

	return rscreen->fences.data[rfence->index];
}

static boolean r600_fence_finish(struct pipe_screen *pscreen,
                                 struct pipe_fence_handle *fence,
                                 uint64_t timeout)
{
	struct r600_screen *rscreen = (struct r600_screen *)pscreen;
	struct r600_fence *rfence = (struct r600_fence*)fence;
	int64_t start_time = 0;
	unsigned spins = 0;

	if (timeout != PIPE_TIMEOUT_INFINITE) {
		start_time = os_time_get();

		/* Convert to microseconds. */
		timeout /= 1000;
	}

	while (rscreen->fences.data[rfence->index] == 0) {
		/* Special-case infinite timeout - wait for the dummy BO to become idle */
		if (timeout == PIPE_TIMEOUT_INFINITE) {
			rscreen->ws->buffer_wait(rfence->sleep_bo->buf, RADEON_USAGE_READWRITE);
			break;
		}

		/* The dummy BO will be busy until the CS including the fence has completed, or
		 * the GPU is reset. Don't bother continuing to spin when the BO is idle. */
		if (!rscreen->ws->buffer_is_busy(rfence->sleep_bo->buf, RADEON_USAGE_READWRITE))
			break;

		if (++spins % 256)
			continue;
#ifdef PIPE_OS_UNIX
		sched_yield();
#else
		os_time_sleep(10);
#endif
		if (timeout != PIPE_TIMEOUT_INFINITE &&
		    os_time_get() - start_time >= timeout) {
			break;
		}
	}

	return rscreen->fences.data[rfence->index] != 0;
}

static int evergreen_interpret_tiling(struct r600_screen *rscreen, uint32_t tiling_config)
{
	switch (tiling_config & 0xf) {
	case 0:
		rscreen->tiling_info.num_channels = 1;
		break;
	case 1:
		rscreen->tiling_info.num_channels = 2;
		break;
	case 2:
		rscreen->tiling_info.num_channels = 4;
		break;
	case 3:
		rscreen->tiling_info.num_channels = 8;
		break;
	default:
		return -EINVAL;
	}

	switch ((tiling_config & 0xf0) >> 4) {
	case 0:
		rscreen->tiling_info.num_banks = 4;
		break;
	case 1:
		rscreen->tiling_info.num_banks = 8;
		break;
	case 2:
		rscreen->tiling_info.num_banks = 16;
		break;
	default:
		return -EINVAL;
	}

	switch ((tiling_config & 0xf00) >> 8) {
	case 0:
		rscreen->tiling_info.group_bytes = 256;
		break;
	case 1:
		rscreen->tiling_info.group_bytes = 512;
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static int r600_init_tiling(struct r600_screen *rscreen)
{
	uint32_t tiling_config = rscreen->info.r600_tiling_config;

	/* set default group bytes, overridden by tiling info ioctl */
	rscreen->tiling_info.group_bytes = 512;

	if (!tiling_config)
		return 0;

	return evergreen_interpret_tiling(rscreen, tiling_config);
}

static unsigned radeon_family_from_device(unsigned device)
{
	switch (device) {
#define CHIPSET(pciid, name, family) case pciid: return CHIP_##family;
#include "pci_ids/radeonsi_pci_ids.h"
#undef CHIPSET
	default:
		return CHIP_UNKNOWN;
	}
}

struct pipe_screen *radeonsi_screen_create(struct radeon_winsys *ws)
{
	struct r600_screen *rscreen = CALLOC_STRUCT(r600_screen);
	if (rscreen == NULL) {
		return NULL;
	}

	rscreen->ws = ws;
	ws->query_info(ws, &rscreen->info);

	rscreen->family = radeon_family_from_device(rscreen->info.pci_id);
	if (rscreen->family == CHIP_UNKNOWN) {
		fprintf(stderr, "r600: Unknown chipset 0x%04X\n", rscreen->info.pci_id);
		FREE(rscreen);
		return NULL;
	}

	/* setup class */
	if (rscreen->family >= CHIP_TAHITI) {
		rscreen->chip_class = TAHITI;
	} else {
		fprintf(stderr, "r600: Unsupported family %d\n", rscreen->family);
		FREE(rscreen);
		return NULL;
	}

	if (r600_init_tiling(rscreen)) {
		FREE(rscreen);
		return NULL;
	}

	rscreen->screen.destroy = r600_destroy_screen;
	rscreen->screen.get_name = r600_get_name;
	rscreen->screen.get_vendor = r600_get_vendor;
	rscreen->screen.get_param = r600_get_param;
	rscreen->screen.get_shader_param = r600_get_shader_param;
	rscreen->screen.get_paramf = r600_get_paramf;
	rscreen->screen.get_video_param = r600_get_video_param;
	rscreen->screen.is_format_supported = si_is_format_supported;
	rscreen->screen.is_video_format_supported = vl_video_buffer_is_format_supported;
	rscreen->screen.context_create = r600_create_context;
	rscreen->screen.fence_reference = r600_fence_reference;
	rscreen->screen.fence_signalled = r600_fence_signalled;
	rscreen->screen.fence_finish = r600_fence_finish;
	r600_init_screen_resource_functions(&rscreen->screen);

	util_format_s3tc_init();

	rscreen->fences.bo = NULL;
	rscreen->fences.data = NULL;
	rscreen->fences.next_index = 0;
	LIST_INITHEAD(&rscreen->fences.pool);
	LIST_INITHEAD(&rscreen->fences.blocks);
	pipe_mutex_init(rscreen->fences.mutex);

	return &rscreen->screen;
}