src/gallium/drivers/llvmpipe/lp_screen.c - platform/external/mesa3d - Git at Google

 /**************************************************************************
  *
  * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
  * All Rights Reserved.
  *
  * 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, 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 TUNGSTEN GRAPHICS AND/OR ITS 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 "util/u_memory.h"
 #include "util/u_math.h"
 #include "util/u_cpu_detect.h"
 #include "util/u_format.h"
 #include "util/u_string.h"
 #include "util/u_format_s3tc.h"
 #include "pipe/p_defines.h"
 #include "pipe/p_screen.h"
 #include "draw/draw_context.h"

 #include "lp_texture.h"
 #include "lp_fence.h"
 #include "lp_jit.h"
 #include "lp_screen.h"
 #include "lp_context.h"
 #include "lp_debug.h"
 #include "lp_public.h"
 #include "lp_limits.h"
 #include "lp_rast.h"

 #include "state_tracker/sw_winsys.h"

 #ifdef DEBUG
 int LP_DEBUG = 0;

 static const struct debug_named_value lp_debug_flags[] = {
    { "pipe",   DEBUG_PIPE, NULL },
    { "tgsi",   DEBUG_TGSI, NULL },
    { "tex",    DEBUG_TEX, NULL },
    { "setup",  DEBUG_SETUP, NULL },
    { "rast",   DEBUG_RAST, NULL },
    { "query",  DEBUG_QUERY, NULL },
    { "screen", DEBUG_SCREEN, NULL },
    { "show_tiles",    DEBUG_SHOW_TILES, NULL },
    { "show_subtiles", DEBUG_SHOW_SUBTILES, NULL },
    { "counters", DEBUG_COUNTERS, NULL },
    { "scene", DEBUG_SCENE, NULL },
    { "fence", DEBUG_FENCE, NULL },
    { "mem", DEBUG_MEM, NULL },
    { "fs", DEBUG_FS, NULL },
    DEBUG_NAMED_VALUE_END
 };
 #endif

 int LP_PERF = 0;
 static const struct debug_named_value lp_perf_flags[] = {
    { "texmem",         PERF_TEX_MEM, NULL },
    { "no_mipmap",      PERF_NO_MIPMAPS, NULL },
    { "no_linear",      PERF_NO_LINEAR, NULL },
    { "no_mip_linear",  PERF_NO_MIP_LINEAR, NULL },
    { "no_tex",         PERF_NO_TEX, NULL },
    { "no_blend",       PERF_NO_BLEND, NULL },
    { "no_depth",       PERF_NO_DEPTH, NULL },
    { "no_alphatest",   PERF_NO_ALPHATEST, NULL },
    DEBUG_NAMED_VALUE_END
 };


 static const char *
 llvmpipe_get_vendor(struct pipe_screen *screen)
 {
    return "VMware, Inc.";
 }


 static const char *
 llvmpipe_get_name(struct pipe_screen *screen)
 {
    static char buf[100];
    util_snprintf(buf, sizeof(buf), "llvmpipe (LLVM 0x%x)", HAVE_LLVM);
    return buf;
 }


 static int
 llvmpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
 {
    switch (param) {
    case PIPE_CAP_MAX_COMBINED_SAMPLERS:
       return 2 * PIPE_MAX_SAMPLERS;  /* VS + FS samplers */
    case PIPE_CAP_NPOT_TEXTURES:
       return 1;
    case PIPE_CAP_TWO_SIDED_STENCIL:
       return 1;
    case PIPE_CAP_SM3:
       return 1;
    case PIPE_CAP_MAX_DUAL_SOURCE_RENDER_TARGETS:
       return 0;
    case PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS:
       return 0;
    case PIPE_CAP_ANISOTROPIC_FILTER:
       return 0;
    case PIPE_CAP_POINT_SPRITE:
       return 1;
    case PIPE_CAP_MAX_RENDER_TARGETS:
       return PIPE_MAX_COLOR_BUFS;
    case PIPE_CAP_OCCLUSION_QUERY:
       return 1;
    case PIPE_CAP_TIMER_QUERY:
       return 0;
    case PIPE_CAP_TEXTURE_MIRROR_CLAMP:
       return 1;
    case PIPE_CAP_TEXTURE_SHADOW_MAP:
       return 1;
    case PIPE_CAP_TEXTURE_SWIZZLE:
       return 1;
    case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
       return LP_MAX_TEXTURE_2D_LEVELS;
    case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
       return LP_MAX_TEXTURE_3D_LEVELS;
    case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
       return LP_MAX_TEXTURE_2D_LEVELS;
    case PIPE_CAP_BLEND_EQUATION_SEPARATE:
       return 1;
    case PIPE_CAP_INDEP_BLEND_ENABLE:
       return 1;
    case PIPE_CAP_INDEP_BLEND_FUNC:
       return 1;
    case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
    case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
       return 1;
    case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
    case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
       return 0;
    case PIPE_CAP_PRIMITIVE_RESTART:
       return 1;
    case PIPE_CAP_DEPTHSTENCIL_CLEAR_SEPARATE:
       return 1;
    case PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS:
       return 0;
    case PIPE_CAP_DEPTH_CLIP_DISABLE:
       return 0;
    case PIPE_CAP_SHADER_STENCIL_EXPORT:
       return 0;
    case PIPE_CAP_TGSI_INSTANCEID:
    case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
       return 1;
    case PIPE_CAP_FRAGMENT_COLOR_CLAMPED:
       return 0;
    case PIPE_CAP_MIXED_COLORBUFFER_FORMATS:
       return 1;
    case PIPE_CAP_SEAMLESS_CUBE_MAP:
    case PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE:
       return 0;
    case PIPE_CAP_SCALED_RESOLVE:
       return 0;
    case PIPE_CAP_MIN_TEXEL_OFFSET:
    case PIPE_CAP_MAX_TEXEL_OFFSET:
       return 0;
    case PIPE_CAP_CONDITIONAL_RENDER:
       return 1;
    case PIPE_CAP_TEXTURE_BARRIER:
       return 0;
    case PIPE_CAP_MAX_STREAM_OUTPUT_SEPARATE_COMPONENTS:
    case PIPE_CAP_MAX_STREAM_OUTPUT_INTERLEAVED_COMPONENTS:
    case PIPE_CAP_STREAM_OUTPUT_PAUSE_RESUME:
       return 0;
    case PIPE_CAP_TGSI_CAN_COMPACT_VARYINGS:
    case PIPE_CAP_TGSI_CAN_COMPACT_CONSTANTS:
       return 0;
    case PIPE_CAP_VERTEX_COLOR_UNCLAMPED:
    case PIPE_CAP_VERTEX_COLOR_CLAMPED:
       return 0;
    case PIPE_CAP_GLSL_FEATURE_LEVEL:
       return 120;
    case PIPE_CAP_QUADS_FOLLOW_PROVOKING_VERTEX_CONVENTION:
       return 0;
    case PIPE_CAP_COMPUTE:
       return 0;
    case PIPE_CAP_USER_VERTEX_BUFFERS:
    case PIPE_CAP_USER_INDEX_BUFFERS:
    case PIPE_CAP_USER_CONSTANT_BUFFERS:
       return 1;
    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:
       return 0;

    case PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT:
       return 16;
    case PIPE_CAP_START_INSTANCE:
    case PIPE_CAP_QUERY_TIMESTAMP:
       return 0;
    }
    /* should only get here on unhandled cases */
    debug_printf("Unexpected PIPE_CAP %d query\n", param);
    return 0;
 }

 static int
 llvmpipe_get_shader_param(struct pipe_screen *screen, unsigned shader, enum pipe_shader_cap param)
 {
    switch(shader)
    {
    case PIPE_SHADER_FRAGMENT:
       switch (param) {
       default:
          return gallivm_get_shader_param(param);
       }
    case PIPE_SHADER_VERTEX:
    case PIPE_SHADER_GEOMETRY:
       switch (param) {
       case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
          /* At this time, the draw module and llvmpipe driver only
           * support vertex shader texture lookups when LLVM is enabled in
           * the draw module.
           */
          if (debug_get_bool_option("DRAW_USE_LLVM", TRUE))
             return PIPE_MAX_SAMPLERS;
          else
             return 0;
       default:
          return draw_get_shader_param(shader, param);
       }
    default:
       return 0;
    }
 }

 static float
 llvmpipe_get_paramf(struct pipe_screen *screen, enum pipe_capf param)
 {
    switch (param) {
    case PIPE_CAPF_MAX_LINE_WIDTH:
       /* fall-through */
    case PIPE_CAPF_MAX_LINE_WIDTH_AA:
       return 255.0; /* arbitrary */
    case PIPE_CAPF_MAX_POINT_WIDTH:
       /* fall-through */
    case PIPE_CAPF_MAX_POINT_WIDTH_AA:
       return 255.0; /* arbitrary */
    case PIPE_CAPF_MAX_TEXTURE_ANISOTROPY:
       return 16.0; /* not actually signficant at this time */
    case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
       return 16.0; /* arbitrary */
    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 0.0;
    }
    /* should only get here on unhandled cases */
    debug_printf("Unexpected PIPE_CAP %d query\n", param);
    return 0.0;
 }


 /**
  * Query format support for creating a texture, drawing surface, etc.
  * \param format  the format to test
  * \param type  one of PIPE_TEXTURE, PIPE_SURFACE
  */
 static boolean
 llvmpipe_is_format_supported( struct pipe_screen *_screen,
                               enum pipe_format format,
                               enum pipe_texture_target target,
                               unsigned sample_count,
                               unsigned bind)
 {
    struct llvmpipe_screen *screen = llvmpipe_screen(_screen);
    struct sw_winsys *winsys = screen->winsys;
    const struct util_format_description *format_desc;

    format_desc = util_format_description(format);
    if (!format_desc)
       return FALSE;

    assert(target == PIPE_BUFFER ||
           target == PIPE_TEXTURE_1D ||
           target == PIPE_TEXTURE_2D ||
           target == PIPE_TEXTURE_RECT ||
           target == PIPE_TEXTURE_3D ||
           target == PIPE_TEXTURE_CUBE);

    if (sample_count > 1)
       return FALSE;

    if (format_desc->format == PIPE_FORMAT_R11G11B10_FLOAT ||
        format_desc->format == PIPE_FORMAT_R9G9B9E5_FLOAT)
      return TRUE;

    if (bind & PIPE_BIND_RENDER_TARGET) {
       if (format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS ||
           format_desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB)
          return FALSE;

       if (format_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN)
          return FALSE;

       if (format_desc->block.width != 1 ||
           format_desc->block.height != 1)
          return FALSE;
    }

    if (bind & PIPE_BIND_DISPLAY_TARGET) {
       if(!winsys->is_displaytarget_format_supported(winsys, bind, format))
          return FALSE;
    }

    if (bind & PIPE_BIND_DEPTH_STENCIL) {
       if (format_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN)
          return FALSE;

       if (format_desc->colorspace != UTIL_FORMAT_COLORSPACE_ZS)
          return FALSE;

       /* FIXME: Temporary restriction. See lp_state_fs.c. */
       if (format_desc->block.bits != 32)
          return FALSE;
    }

    if (format_desc->layout == UTIL_FORMAT_LAYOUT_S3TC) {
       return util_format_s3tc_enabled;
    }

    /*
     * Everything can be supported by u_format.
     */

    if (format_desc->colorspace != UTIL_FORMAT_COLORSPACE_ZS &&
        !format_desc->fetch_rgba_float) {
       return FALSE;
    }

    return TRUE;
 }


 static void
 llvmpipe_flush_frontbuffer(struct pipe_screen *_screen,
                            struct pipe_resource *resource,
                            unsigned level, unsigned layer,
                            void *context_private)
 {
    struct llvmpipe_screen *screen = llvmpipe_screen(_screen);
    struct sw_winsys *winsys = screen->winsys;
    struct llvmpipe_resource *texture = llvmpipe_resource(resource);

    assert(texture->dt);
    if (texture->dt)
       winsys->displaytarget_display(winsys, texture->dt, context_private);
 }


 static void
 llvmpipe_destroy_screen( struct pipe_screen *_screen )
 {
    struct llvmpipe_screen *screen = llvmpipe_screen(_screen);
    struct sw_winsys *winsys = screen->winsys;

    if (screen->rast)
       lp_rast_destroy(screen->rast);

    lp_jit_screen_cleanup(screen);

    if(winsys->destroy)
       winsys->destroy(winsys);

    pipe_mutex_destroy(screen->rast_mutex);

    FREE(screen);
 }


 /**
  * Fence reference counting.
  */
 static void
 llvmpipe_fence_reference(struct pipe_screen *screen,
                          struct pipe_fence_handle **ptr,
                          struct pipe_fence_handle *fence)
 {
    struct lp_fence **old = (struct lp_fence **) ptr;
    struct lp_fence *f = (struct lp_fence *) fence;

    lp_fence_reference(old, f);
 }


 /**
  * Has the fence been executed/finished?
  */
 static boolean
 llvmpipe_fence_signalled(struct pipe_screen *screen,
                          struct pipe_fence_handle *fence)
 {
    struct lp_fence *f = (struct lp_fence *) fence;
    return lp_fence_signalled(f);
 }


 /**
  * Wait for the fence to finish.
  */
 static boolean
 llvmpipe_fence_finish(struct pipe_screen *screen,
                       struct pipe_fence_handle *fence_handle,
                       uint64_t timeout)
 {
    struct lp_fence *f = (struct lp_fence *) fence_handle;

    lp_fence_wait(f);
    return TRUE;
 }


 /**
  * Create a new pipe_screen object
  * Note: we're not presently subclassing pipe_screen (no llvmpipe_screen).
  */
 struct pipe_screen *
 llvmpipe_create_screen(struct sw_winsys *winsys)
 {
    struct llvmpipe_screen *screen;

 #ifdef PIPE_ARCH_X86
    /* require SSE2 due to LLVM PR6960. */
    util_cpu_detect();
    if (!util_cpu_caps.has_sse2)
        return NULL;
 #endif

 #ifdef DEBUG
    LP_DEBUG = debug_get_flags_option("LP_DEBUG", lp_debug_flags, 0 );
 #endif

    LP_PERF = debug_get_flags_option("LP_PERF", lp_perf_flags, 0 );

    screen = CALLOC_STRUCT(llvmpipe_screen);
    if (!screen)
       return NULL;

    screen->winsys = winsys;

    screen->base.destroy = llvmpipe_destroy_screen;

    screen->base.get_name = llvmpipe_get_name;
    screen->base.get_vendor = llvmpipe_get_vendor;
    screen->base.get_param = llvmpipe_get_param;
    screen->base.get_shader_param = llvmpipe_get_shader_param;
    screen->base.get_paramf = llvmpipe_get_paramf;
    screen->base.is_format_supported = llvmpipe_is_format_supported;

    screen->base.context_create = llvmpipe_create_context;
    screen->base.flush_frontbuffer = llvmpipe_flush_frontbuffer;
    screen->base.fence_reference = llvmpipe_fence_reference;
    screen->base.fence_signalled = llvmpipe_fence_signalled;
    screen->base.fence_finish = llvmpipe_fence_finish;

    llvmpipe_init_screen_resource_funcs(&screen->base);

    lp_jit_screen_init(screen);

    screen->num_threads = util_cpu_caps.nr_cpus > 1 ? util_cpu_caps.nr_cpus : 0;
 #ifdef PIPE_SUBSYSTEM_EMBEDDED
    screen->num_threads = 0;
 #endif
    screen->num_threads = debug_get_num_option("LP_NUM_THREADS", screen->num_threads);
    screen->num_threads = MIN2(screen->num_threads, LP_MAX_THREADS);

    screen->rast = lp_rast_create(screen->num_threads);
    if (!screen->rast) {
       lp_jit_screen_cleanup(screen);
       FREE(screen);
       return NULL;
    }
    pipe_mutex_init(screen->rast_mutex);

    util_format_s3tc_init();

    return &screen->base;
 }
	/**************************************************************************
	*
	* Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
	* All Rights Reserved.
	*
	* 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, 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 TUNGSTEN GRAPHICS AND/OR ITS 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 "util/u_memory.h"
	#include "util/u_math.h"
	#include "util/u_cpu_detect.h"
	#include "util/u_format.h"
	#include "util/u_string.h"
	#include "util/u_format_s3tc.h"
	#include "pipe/p_defines.h"
	#include "pipe/p_screen.h"
	#include "draw/draw_context.h"

	#include "lp_texture.h"
	#include "lp_fence.h"
	#include "lp_jit.h"
	#include "lp_screen.h"
	#include "lp_context.h"
	#include "lp_debug.h"
	#include "lp_public.h"
	#include "lp_limits.h"
	#include "lp_rast.h"

	#include "state_tracker/sw_winsys.h"

	#ifdef DEBUG
	int LP_DEBUG = 0;

	static const struct debug_named_value lp_debug_flags[] = {
	{ "pipe", DEBUG_PIPE, NULL },
	{ "tgsi", DEBUG_TGSI, NULL },
	{ "tex", DEBUG_TEX, NULL },
	{ "setup", DEBUG_SETUP, NULL },
	{ "rast", DEBUG_RAST, NULL },
	{ "query", DEBUG_QUERY, NULL },
	{ "screen", DEBUG_SCREEN, NULL },
	{ "show_tiles", DEBUG_SHOW_TILES, NULL },
	{ "show_subtiles", DEBUG_SHOW_SUBTILES, NULL },
	{ "counters", DEBUG_COUNTERS, NULL },
	{ "scene", DEBUG_SCENE, NULL },
	{ "fence", DEBUG_FENCE, NULL },
	{ "mem", DEBUG_MEM, NULL },
	{ "fs", DEBUG_FS, NULL },
	DEBUG_NAMED_VALUE_END
	};
	#endif

	int LP_PERF = 0;
	static const struct debug_named_value lp_perf_flags[] = {
	{ "texmem", PERF_TEX_MEM, NULL },
	{ "no_mipmap", PERF_NO_MIPMAPS, NULL },
	{ "no_linear", PERF_NO_LINEAR, NULL },
	{ "no_mip_linear", PERF_NO_MIP_LINEAR, NULL },
	{ "no_tex", PERF_NO_TEX, NULL },
	{ "no_blend", PERF_NO_BLEND, NULL },
	{ "no_depth", PERF_NO_DEPTH, NULL },
	{ "no_alphatest", PERF_NO_ALPHATEST, NULL },
	DEBUG_NAMED_VALUE_END
	};


	static const char *
	llvmpipe_get_vendor(struct pipe_screen *screen)
	{
	return "VMware, Inc.";
	}


	static const char *
	llvmpipe_get_name(struct pipe_screen *screen)
	{
	static char buf[100];
	util_snprintf(buf, sizeof(buf), "llvmpipe (LLVM 0x%x)", HAVE_LLVM);
	return buf;
	}


	static int
	llvmpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
	{
	switch (param) {
	case PIPE_CAP_MAX_COMBINED_SAMPLERS:
	return 2 * PIPE_MAX_SAMPLERS; /* VS + FS samplers */
	case PIPE_CAP_NPOT_TEXTURES:
	return 1;
	case PIPE_CAP_TWO_SIDED_STENCIL:
	return 1;
	case PIPE_CAP_SM3:
	return 1;
	case PIPE_CAP_MAX_DUAL_SOURCE_RENDER_TARGETS:
	return 0;
	case PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS:
	return 0;
	case PIPE_CAP_ANISOTROPIC_FILTER:
	return 0;
	case PIPE_CAP_POINT_SPRITE:
	return 1;
	case PIPE_CAP_MAX_RENDER_TARGETS:
	return PIPE_MAX_COLOR_BUFS;
	case PIPE_CAP_OCCLUSION_QUERY:
	return 1;
	case PIPE_CAP_TIMER_QUERY:
	return 0;
	case PIPE_CAP_TEXTURE_MIRROR_CLAMP:
	return 1;
	case PIPE_CAP_TEXTURE_SHADOW_MAP:
	return 1;
	case PIPE_CAP_TEXTURE_SWIZZLE:
	return 1;
	case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
	return LP_MAX_TEXTURE_2D_LEVELS;
	case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
	return LP_MAX_TEXTURE_3D_LEVELS;
	case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
	return LP_MAX_TEXTURE_2D_LEVELS;
	case PIPE_CAP_BLEND_EQUATION_SEPARATE:
	return 1;
	case PIPE_CAP_INDEP_BLEND_ENABLE:
	return 1;
	case PIPE_CAP_INDEP_BLEND_FUNC:
	return 1;
	case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
	case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
	return 1;
	case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
	case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
	return 0;
	case PIPE_CAP_PRIMITIVE_RESTART:
	return 1;
	case PIPE_CAP_DEPTHSTENCIL_CLEAR_SEPARATE:
	return 1;
	case PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS:
	return 0;
	case PIPE_CAP_DEPTH_CLIP_DISABLE:
	return 0;
	case PIPE_CAP_SHADER_STENCIL_EXPORT:
	return 0;
	case PIPE_CAP_TGSI_INSTANCEID:
	case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
	return 1;
	case PIPE_CAP_FRAGMENT_COLOR_CLAMPED:
	return 0;
	case PIPE_CAP_MIXED_COLORBUFFER_FORMATS:
	return 1;
	case PIPE_CAP_SEAMLESS_CUBE_MAP:
	case PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE:
	return 0;
	case PIPE_CAP_SCALED_RESOLVE:
	return 0;
	case PIPE_CAP_MIN_TEXEL_OFFSET:
	case PIPE_CAP_MAX_TEXEL_OFFSET:
	return 0;
	case PIPE_CAP_CONDITIONAL_RENDER:
	return 1;
	case PIPE_CAP_TEXTURE_BARRIER:
	return 0;
	case PIPE_CAP_MAX_STREAM_OUTPUT_SEPARATE_COMPONENTS:
	case PIPE_CAP_MAX_STREAM_OUTPUT_INTERLEAVED_COMPONENTS:
	case PIPE_CAP_STREAM_OUTPUT_PAUSE_RESUME:
	return 0;
	case PIPE_CAP_TGSI_CAN_COMPACT_VARYINGS:
	case PIPE_CAP_TGSI_CAN_COMPACT_CONSTANTS:
	return 0;
	case PIPE_CAP_VERTEX_COLOR_UNCLAMPED:
	case PIPE_CAP_VERTEX_COLOR_CLAMPED:
	return 0;
	case PIPE_CAP_GLSL_FEATURE_LEVEL:
	return 120;
	case PIPE_CAP_QUADS_FOLLOW_PROVOKING_VERTEX_CONVENTION:
	return 0;
	case PIPE_CAP_COMPUTE:
	return 0;
	case PIPE_CAP_USER_VERTEX_BUFFERS:
	case PIPE_CAP_USER_INDEX_BUFFERS:
	case PIPE_CAP_USER_CONSTANT_BUFFERS:
	return 1;
	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:
	return 0;

	case PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT:
	return 16;
	case PIPE_CAP_START_INSTANCE:
	case PIPE_CAP_QUERY_TIMESTAMP:
	return 0;
	}
	/* should only get here on unhandled cases */
	debug_printf("Unexpected PIPE_CAP %d query\n", param);
	return 0;
	}

	static int
	llvmpipe_get_shader_param(struct pipe_screen *screen, unsigned shader, enum pipe_shader_cap param)
	{
	switch(shader)
	{
	case PIPE_SHADER_FRAGMENT:
	switch (param) {
	default:
	return gallivm_get_shader_param(param);
	}
	case PIPE_SHADER_VERTEX:
	case PIPE_SHADER_GEOMETRY:
	switch (param) {
	case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
	/* At this time, the draw module and llvmpipe driver only
	* support vertex shader texture lookups when LLVM is enabled in
	* the draw module.
	*/
	if (debug_get_bool_option("DRAW_USE_LLVM", TRUE))
	return PIPE_MAX_SAMPLERS;
	else
	return 0;
	default:
	return draw_get_shader_param(shader, param);
	}
	default:
	return 0;
	}
	}

	static float
	llvmpipe_get_paramf(struct pipe_screen *screen, enum pipe_capf param)
	{
	switch (param) {
	case PIPE_CAPF_MAX_LINE_WIDTH:
	/* fall-through */
	case PIPE_CAPF_MAX_LINE_WIDTH_AA:
	return 255.0; /* arbitrary */
	case PIPE_CAPF_MAX_POINT_WIDTH:
	/* fall-through */
	case PIPE_CAPF_MAX_POINT_WIDTH_AA:
	return 255.0; /* arbitrary */
	case PIPE_CAPF_MAX_TEXTURE_ANISOTROPY:
	return 16.0; /* not actually signficant at this time */
	case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
	return 16.0; /* arbitrary */
	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 0.0;
	}
	/* should only get here on unhandled cases */
	debug_printf("Unexpected PIPE_CAP %d query\n", param);
	return 0.0;
	}


	/**
	* Query format support for creating a texture, drawing surface, etc.
	* \param format the format to test
	* \param type one of PIPE_TEXTURE, PIPE_SURFACE
	*/
	static boolean
	llvmpipe_is_format_supported( struct pipe_screen *_screen,
	enum pipe_format format,
	enum pipe_texture_target target,
	unsigned sample_count,
	unsigned bind)
	{
	struct llvmpipe_screen *screen = llvmpipe_screen(_screen);
	struct sw_winsys *winsys = screen->winsys;
	const struct util_format_description *format_desc;

	format_desc = util_format_description(format);
	if (!format_desc)
	return FALSE;

	assert(target == PIPE_BUFFER \|\|
	target == PIPE_TEXTURE_1D \|\|
	target == PIPE_TEXTURE_2D \|\|
	target == PIPE_TEXTURE_RECT \|\|
	target == PIPE_TEXTURE_3D \|\|
	target == PIPE_TEXTURE_CUBE);

	if (sample_count > 1)
	return FALSE;

	if (format_desc->format == PIPE_FORMAT_R11G11B10_FLOAT \|\|
	format_desc->format == PIPE_FORMAT_R9G9B9E5_FLOAT)
	return TRUE;

	if (bind & PIPE_BIND_RENDER_TARGET) {
	if (format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS \|\|
	format_desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB)
	return FALSE;

	if (format_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN)
	return FALSE;

	if (format_desc->block.width != 1 \|\|
	format_desc->block.height != 1)
	return FALSE;
	}

	if (bind & PIPE_BIND_DISPLAY_TARGET) {
	if(!winsys->is_displaytarget_format_supported(winsys, bind, format))
	return FALSE;
	}

	if (bind & PIPE_BIND_DEPTH_STENCIL) {
	if (format_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN)
	return FALSE;

	if (format_desc->colorspace != UTIL_FORMAT_COLORSPACE_ZS)
	return FALSE;

	/* FIXME: Temporary restriction. See lp_state_fs.c. */
	if (format_desc->block.bits != 32)
	return FALSE;
	}

	if (format_desc->layout == UTIL_FORMAT_LAYOUT_S3TC) {
	return util_format_s3tc_enabled;
	}

	/*
	* Everything can be supported by u_format.
	*/

	if (format_desc->colorspace != UTIL_FORMAT_COLORSPACE_ZS &&
	!format_desc->fetch_rgba_float) {
	return FALSE;
	}

	return TRUE;
	}




	static void
	llvmpipe_flush_frontbuffer(struct pipe_screen *_screen,
	struct pipe_resource *resource,
	unsigned level, unsigned layer,
	void *context_private)
	{
	struct llvmpipe_screen *screen = llvmpipe_screen(_screen);
	struct sw_winsys *winsys = screen->winsys;
	struct llvmpipe_resource *texture = llvmpipe_resource(resource);

	assert(texture->dt);
	if (texture->dt)
	winsys->displaytarget_display(winsys, texture->dt, context_private);
	}


	static void
	llvmpipe_destroy_screen( struct pipe_screen *_screen )
	{
	struct llvmpipe_screen *screen = llvmpipe_screen(_screen);
	struct sw_winsys *winsys = screen->winsys;

	if (screen->rast)
	lp_rast_destroy(screen->rast);

	lp_jit_screen_cleanup(screen);

	if(winsys->destroy)
	winsys->destroy(winsys);

	pipe_mutex_destroy(screen->rast_mutex);

	FREE(screen);
	}




	/**
	* Fence reference counting.
	*/
	static void
	llvmpipe_fence_reference(struct pipe_screen *screen,
	struct pipe_fence_handle **ptr,
	struct pipe_fence_handle *fence)
	{
	struct lp_fence old = (struct lp_fence ) ptr;
	struct lp_fence f = (struct lp_fence ) fence;

	lp_fence_reference(old, f);
	}


	/**
	* Has the fence been executed/finished?
	*/
	static boolean
	llvmpipe_fence_signalled(struct pipe_screen *screen,
	struct pipe_fence_handle *fence)
	{
	struct lp_fence f = (struct lp_fence ) fence;
	return lp_fence_signalled(f);
	}


	/**
	* Wait for the fence to finish.
	*/
	static boolean
	llvmpipe_fence_finish(struct pipe_screen *screen,
	struct pipe_fence_handle *fence_handle,
	uint64_t timeout)
	{
	struct lp_fence f = (struct lp_fence ) fence_handle;

	lp_fence_wait(f);
	return TRUE;
	}



	/**
	* Create a new pipe_screen object
	* Note: we're not presently subclassing pipe_screen (no llvmpipe_screen).
	*/
	struct pipe_screen *
	llvmpipe_create_screen(struct sw_winsys *winsys)
	{
	struct llvmpipe_screen *screen;

	#ifdef PIPE_ARCH_X86
	/* require SSE2 due to LLVM PR6960. */
	util_cpu_detect();
	if (!util_cpu_caps.has_sse2)
	return NULL;
	#endif

	#ifdef DEBUG
	LP_DEBUG = debug_get_flags_option("LP_DEBUG", lp_debug_flags, 0 );
	#endif

	LP_PERF = debug_get_flags_option("LP_PERF", lp_perf_flags, 0 );

	screen = CALLOC_STRUCT(llvmpipe_screen);
	if (!screen)
	return NULL;

	screen->winsys = winsys;

	screen->base.destroy = llvmpipe_destroy_screen;

	screen->base.get_name = llvmpipe_get_name;
	screen->base.get_vendor = llvmpipe_get_vendor;
	screen->base.get_param = llvmpipe_get_param;
	screen->base.get_shader_param = llvmpipe_get_shader_param;
	screen->base.get_paramf = llvmpipe_get_paramf;
	screen->base.is_format_supported = llvmpipe_is_format_supported;

	screen->base.context_create = llvmpipe_create_context;
	screen->base.flush_frontbuffer = llvmpipe_flush_frontbuffer;
	screen->base.fence_reference = llvmpipe_fence_reference;
	screen->base.fence_signalled = llvmpipe_fence_signalled;
	screen->base.fence_finish = llvmpipe_fence_finish;

	llvmpipe_init_screen_resource_funcs(&screen->base);

	lp_jit_screen_init(screen);

	screen->num_threads = util_cpu_caps.nr_cpus > 1 ? util_cpu_caps.nr_cpus : 0;
	#ifdef PIPE_SUBSYSTEM_EMBEDDED
	screen->num_threads = 0;
	#endif
	screen->num_threads = debug_get_num_option("LP_NUM_THREADS", screen->num_threads);
	screen->num_threads = MIN2(screen->num_threads, LP_MAX_THREADS);

	screen->rast = lp_rast_create(screen->num_threads);
	if (!screen->rast) {
	lp_jit_screen_cleanup(screen);
	FREE(screen);
	return NULL;
	}
	pipe_mutex_init(screen->rast_mutex);

	util_format_s3tc_init();

	return &screen->base;
	}