src/mesa/drivers/dri/i965/gen7_sampler_state.c - platform/external/mesa3d - Git at Google

 /*
  * Copyright © 2011 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.
  */

 #include "brw_context.h"
 #include "brw_state.h"
 #include "brw_defines.h"
 #include "intel_batchbuffer.h"

 #include "main/macros.h"
 #include "main/samplerobj.h"

 /**
  * Sets the sampler state for a single unit.
  */
 static void
 gen7_update_sampler_state(struct brw_context *brw, int unit, int ss_index,
 			  struct gen7_sampler_state *sampler)
 {
    struct intel_context *intel = &brw->intel;
    struct gl_context *ctx = &intel->ctx;
    struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
    struct gl_texture_object *texObj = texUnit->_Current;
    struct gl_sampler_object *gl_sampler = _mesa_get_samplerobj(ctx, unit);
    bool using_nearest = false;

    /* These don't use samplers at all. */
    if (texObj->Target == GL_TEXTURE_BUFFER)
       return;

    switch (gl_sampler->MinFilter) {
    case GL_NEAREST:
       sampler->ss0.min_filter = BRW_MAPFILTER_NEAREST;
       sampler->ss0.mip_filter = BRW_MIPFILTER_NONE;
       using_nearest = true;
       break;
    case GL_LINEAR:
       sampler->ss0.min_filter = BRW_MAPFILTER_LINEAR;
       sampler->ss0.mip_filter = BRW_MIPFILTER_NONE;
       break;
    case GL_NEAREST_MIPMAP_NEAREST:
       sampler->ss0.min_filter = BRW_MAPFILTER_NEAREST;
       sampler->ss0.mip_filter = BRW_MIPFILTER_NEAREST;
       break;
    case GL_LINEAR_MIPMAP_NEAREST:
       sampler->ss0.min_filter = BRW_MAPFILTER_LINEAR;
       sampler->ss0.mip_filter = BRW_MIPFILTER_NEAREST;
       break;
    case GL_NEAREST_MIPMAP_LINEAR:
       sampler->ss0.min_filter = BRW_MAPFILTER_NEAREST;
       sampler->ss0.mip_filter = BRW_MIPFILTER_LINEAR;
       break;
    case GL_LINEAR_MIPMAP_LINEAR:
       sampler->ss0.min_filter = BRW_MAPFILTER_LINEAR;
       sampler->ss0.mip_filter = BRW_MIPFILTER_LINEAR;
       break;
    default:
       break;
    }

    /* Set Anisotropy: */
    if (gl_sampler->MaxAnisotropy > 1.0) {
       sampler->ss0.min_filter = BRW_MAPFILTER_ANISOTROPIC;
       sampler->ss0.mag_filter = BRW_MAPFILTER_ANISOTROPIC;

       if (gl_sampler->MaxAnisotropy > 2.0) {
 	 sampler->ss3.max_aniso = MIN2((gl_sampler->MaxAnisotropy - 2) / 2,
 				       BRW_ANISORATIO_16);
       }
    }
    else {
       switch (gl_sampler->MagFilter) {
       case GL_NEAREST:
 	 sampler->ss0.mag_filter = BRW_MAPFILTER_NEAREST;
 	 using_nearest = true;
 	 break;
       case GL_LINEAR:
 	 sampler->ss0.mag_filter = BRW_MAPFILTER_LINEAR;
 	 break;
       default:
 	 break;
       }
    }

    sampler->ss3.r_wrap_mode = translate_wrap_mode(gl_sampler->WrapR,
 						  using_nearest);
    sampler->ss3.s_wrap_mode = translate_wrap_mode(gl_sampler->WrapS,
 						  using_nearest);
    sampler->ss3.t_wrap_mode = translate_wrap_mode(gl_sampler->WrapT,
 						  using_nearest);

    /* Cube-maps on 965 and later must use the same wrap mode for all 3
     * coordinate dimensions.  Futher, only CUBE and CLAMP are valid.
     */
    if (texObj->Target == GL_TEXTURE_CUBE_MAP) {
       if (ctx->Texture.CubeMapSeamless &&
 	  (gl_sampler->MinFilter != GL_NEAREST ||
 	   gl_sampler->MagFilter != GL_NEAREST)) {
 	 sampler->ss3.r_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 	 sampler->ss3.s_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 	 sampler->ss3.t_wrap_mode = BRW_TEXCOORDMODE_CUBE;
       } else {
 	 sampler->ss3.r_wrap_mode = BRW_TEXCOORDMODE_CLAMP;
 	 sampler->ss3.s_wrap_mode = BRW_TEXCOORDMODE_CLAMP;
 	 sampler->ss3.t_wrap_mode = BRW_TEXCOORDMODE_CLAMP;
       }
    } else if (texObj->Target == GL_TEXTURE_1D) {
       /* There's a bug in 1D texture sampling - it actually pays
        * attention to the wrap_t value, though it should not.
        * Override the wrap_t value here to GL_REPEAT to keep
        * any nonexistent border pixels from floating in.
        */
       sampler->ss3.t_wrap_mode = BRW_TEXCOORDMODE_WRAP;
    }

    /* Set shadow function: */
    if (gl_sampler->CompareMode == GL_COMPARE_R_TO_TEXTURE_ARB) {
       /* Shadowing is "enabled" by emitting a particular sampler
        * message (sample_c).  So need to recompile WM program when
        * shadow comparison is enabled on each/any texture unit.
        */
       sampler->ss1.shadow_function =
 	 intel_translate_shadow_compare_func(gl_sampler->CompareFunc);
    }

    /* Set LOD bias: */
    sampler->ss0.lod_bias = S_FIXED(CLAMP(texUnit->LodBias +
 					 gl_sampler->LodBias, -16, 15), 8);

    sampler->ss0.lod_preclamp = 1; /* OpenGL mode */
    sampler->ss0.default_color_mode = 0; /* OpenGL/DX10 mode */

    /* Set BaseMipLevel, MaxLOD, MinLOD:
     *
     * XXX: I don't think that using firstLevel, lastLevel works,
     * because we always setup the surface state as if firstLevel ==
     * level zero.  Probably have to subtract firstLevel from each of
     * these:
     */
    sampler->ss0.base_level = U_FIXED(0, 1);

    sampler->ss1.max_lod = U_FIXED(CLAMP(gl_sampler->MaxLod, 0, 13), 8);
    sampler->ss1.min_lod = U_FIXED(CLAMP(gl_sampler->MinLod, 0, 13), 8);

    /* The sampler can handle non-normalized texture rectangle coordinates
     * natively
     */
    if (texObj->Target == GL_TEXTURE_RECTANGLE) {
       sampler->ss3.non_normalized_coord = 1;
    }

    upload_default_color(brw, gl_sampler, unit, ss_index);

    sampler->ss2.default_color_pointer = brw->wm.sdc_offset[ss_index] >> 5;

    if (sampler->ss0.min_filter != BRW_MAPFILTER_NEAREST)
       sampler->ss3.address_round |= BRW_ADDRESS_ROUNDING_ENABLE_U_MIN |
                                     BRW_ADDRESS_ROUNDING_ENABLE_V_MIN |
                                     BRW_ADDRESS_ROUNDING_ENABLE_R_MIN;
    if (sampler->ss0.mag_filter != BRW_MAPFILTER_NEAREST)
       sampler->ss3.address_round |= BRW_ADDRESS_ROUNDING_ENABLE_U_MAG |
                                     BRW_ADDRESS_ROUNDING_ENABLE_V_MAG |
                                     BRW_ADDRESS_ROUNDING_ENABLE_R_MAG;
 }


 static void
 gen7_upload_samplers(struct brw_context *brw)
 {
    struct gl_context *ctx = &brw->intel.ctx;
    struct gen7_sampler_state *samplers;

    /* BRW_NEW_VERTEX_PROGRAM and BRW_NEW_FRAGMENT_PROGRAM */
    struct gl_program *vs = (struct gl_program *) brw->vertex_program;
    struct gl_program *fs = (struct gl_program *) brw->fragment_program;

    GLbitfield SamplersUsed = vs->SamplersUsed | fs->SamplersUsed;

    brw->sampler.count = _mesa_fls(SamplersUsed);

    if (brw->sampler.count == 0)
       return;

    samplers = brw_state_batch(brw, AUB_TRACE_SAMPLER_STATE,
 			      brw->sampler.count * sizeof(*samplers),
 			      32, &brw->sampler.offset);
    memset(samplers, 0, brw->sampler.count * sizeof(*samplers));

    for (unsigned s = 0; s < brw->sampler.count; s++) {
       if (SamplersUsed & (1 << s)) {
          const unsigned unit = (fs->SamplersUsed & (1 << s)) ?
             fs->SamplerUnits[s] : vs->SamplerUnits[s];
          if (ctx->Texture.Unit[unit]._ReallyEnabled)
             gen7_update_sampler_state(brw, unit, s, &samplers[s]);
       }
    }

    brw->state.dirty.cache |= CACHE_NEW_SAMPLER;
 }

 const struct brw_tracked_state gen7_samplers = {
    .dirty = {
       .mesa = _NEW_TEXTURE,
       .brw = BRW_NEW_BATCH |
              BRW_NEW_VERTEX_PROGRAM |
              BRW_NEW_FRAGMENT_PROGRAM,
       .cache = 0
    },
    .emit = gen7_upload_samplers,
 };
	/*
	* Copyright © 2011 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.
	*/

	#include "brw_context.h"
	#include "brw_state.h"
	#include "brw_defines.h"
	#include "intel_batchbuffer.h"

	#include "main/macros.h"
	#include "main/samplerobj.h"

	/**
	* Sets the sampler state for a single unit.
	*/
	static void
	gen7_update_sampler_state(struct brw_context *brw, int unit, int ss_index,
	struct gen7_sampler_state *sampler)
	{
	struct intel_context *intel = &brw->intel;
	struct gl_context *ctx = &intel->ctx;
	struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
	struct gl_texture_object *texObj = texUnit->_Current;
	struct gl_sampler_object *gl_sampler = _mesa_get_samplerobj(ctx, unit);
	bool using_nearest = false;

	/* These don't use samplers at all. */
	if (texObj->Target == GL_TEXTURE_BUFFER)
	return;

	switch (gl_sampler->MinFilter) {
	case GL_NEAREST:
	sampler->ss0.min_filter = BRW_MAPFILTER_NEAREST;
	sampler->ss0.mip_filter = BRW_MIPFILTER_NONE;
	using_nearest = true;
	break;
	case GL_LINEAR:
	sampler->ss0.min_filter = BRW_MAPFILTER_LINEAR;
	sampler->ss0.mip_filter = BRW_MIPFILTER_NONE;
	break;
	case GL_NEAREST_MIPMAP_NEAREST:
	sampler->ss0.min_filter = BRW_MAPFILTER_NEAREST;
	sampler->ss0.mip_filter = BRW_MIPFILTER_NEAREST;
	break;
	case GL_LINEAR_MIPMAP_NEAREST:
	sampler->ss0.min_filter = BRW_MAPFILTER_LINEAR;
	sampler->ss0.mip_filter = BRW_MIPFILTER_NEAREST;
	break;
	case GL_NEAREST_MIPMAP_LINEAR:
	sampler->ss0.min_filter = BRW_MAPFILTER_NEAREST;
	sampler->ss0.mip_filter = BRW_MIPFILTER_LINEAR;
	break;
	case GL_LINEAR_MIPMAP_LINEAR:
	sampler->ss0.min_filter = BRW_MAPFILTER_LINEAR;
	sampler->ss0.mip_filter = BRW_MIPFILTER_LINEAR;
	break;
	default:
	break;
	}

	/* Set Anisotropy: */
	if (gl_sampler->MaxAnisotropy > 1.0) {
	sampler->ss0.min_filter = BRW_MAPFILTER_ANISOTROPIC;
	sampler->ss0.mag_filter = BRW_MAPFILTER_ANISOTROPIC;

	if (gl_sampler->MaxAnisotropy > 2.0) {
	sampler->ss3.max_aniso = MIN2((gl_sampler->MaxAnisotropy - 2) / 2,
	BRW_ANISORATIO_16);
	}
	}
	else {
	switch (gl_sampler->MagFilter) {
	case GL_NEAREST:
	sampler->ss0.mag_filter = BRW_MAPFILTER_NEAREST;
	using_nearest = true;
	break;
	case GL_LINEAR:
	sampler->ss0.mag_filter = BRW_MAPFILTER_LINEAR;
	break;
	default:
	break;
	}
	}

	sampler->ss3.r_wrap_mode = translate_wrap_mode(gl_sampler->WrapR,
	using_nearest);
	sampler->ss3.s_wrap_mode = translate_wrap_mode(gl_sampler->WrapS,
	using_nearest);
	sampler->ss3.t_wrap_mode = translate_wrap_mode(gl_sampler->WrapT,
	using_nearest);

	/* Cube-maps on 965 and later must use the same wrap mode for all 3
	* coordinate dimensions. Futher, only CUBE and CLAMP are valid.
	*/
	if (texObj->Target == GL_TEXTURE_CUBE_MAP) {
	if (ctx->Texture.CubeMapSeamless &&
	(gl_sampler->MinFilter != GL_NEAREST \|\|
	gl_sampler->MagFilter != GL_NEAREST)) {
	sampler->ss3.r_wrap_mode = BRW_TEXCOORDMODE_CUBE;
	sampler->ss3.s_wrap_mode = BRW_TEXCOORDMODE_CUBE;
	sampler->ss3.t_wrap_mode = BRW_TEXCOORDMODE_CUBE;
	} else {
	sampler->ss3.r_wrap_mode = BRW_TEXCOORDMODE_CLAMP;
	sampler->ss3.s_wrap_mode = BRW_TEXCOORDMODE_CLAMP;
	sampler->ss3.t_wrap_mode = BRW_TEXCOORDMODE_CLAMP;
	}
	} else if (texObj->Target == GL_TEXTURE_1D) {
	/* There's a bug in 1D texture sampling - it actually pays
	* attention to the wrap_t value, though it should not.
	* Override the wrap_t value here to GL_REPEAT to keep
	* any nonexistent border pixels from floating in.
	*/
	sampler->ss3.t_wrap_mode = BRW_TEXCOORDMODE_WRAP;
	}

	/* Set shadow function: */
	if (gl_sampler->CompareMode == GL_COMPARE_R_TO_TEXTURE_ARB) {
	/* Shadowing is "enabled" by emitting a particular sampler
	* message (sample_c). So need to recompile WM program when
	* shadow comparison is enabled on each/any texture unit.
	*/
	sampler->ss1.shadow_function =
	intel_translate_shadow_compare_func(gl_sampler->CompareFunc);
	}

	/* Set LOD bias: */
	sampler->ss0.lod_bias = S_FIXED(CLAMP(texUnit->LodBias +
	gl_sampler->LodBias, -16, 15), 8);

	sampler->ss0.lod_preclamp = 1; /* OpenGL mode */
	sampler->ss0.default_color_mode = 0; /* OpenGL/DX10 mode */

	/* Set BaseMipLevel, MaxLOD, MinLOD:
	*
	* XXX: I don't think that using firstLevel, lastLevel works,
	* because we always setup the surface state as if firstLevel ==
	* level zero. Probably have to subtract firstLevel from each of
	* these:
	*/
	sampler->ss0.base_level = U_FIXED(0, 1);

	sampler->ss1.max_lod = U_FIXED(CLAMP(gl_sampler->MaxLod, 0, 13), 8);
	sampler->ss1.min_lod = U_FIXED(CLAMP(gl_sampler->MinLod, 0, 13), 8);

	/* The sampler can handle non-normalized texture rectangle coordinates
	* natively
	*/
	if (texObj->Target == GL_TEXTURE_RECTANGLE) {
	sampler->ss3.non_normalized_coord = 1;
	}

	upload_default_color(brw, gl_sampler, unit, ss_index);

	sampler->ss2.default_color_pointer = brw->wm.sdc_offset[ss_index] >> 5;

	if (sampler->ss0.min_filter != BRW_MAPFILTER_NEAREST)
	sampler->ss3.address_round \|= BRW_ADDRESS_ROUNDING_ENABLE_U_MIN \|
	BRW_ADDRESS_ROUNDING_ENABLE_V_MIN \|
	BRW_ADDRESS_ROUNDING_ENABLE_R_MIN;
	if (sampler->ss0.mag_filter != BRW_MAPFILTER_NEAREST)
	sampler->ss3.address_round \|= BRW_ADDRESS_ROUNDING_ENABLE_U_MAG \|
	BRW_ADDRESS_ROUNDING_ENABLE_V_MAG \|
	BRW_ADDRESS_ROUNDING_ENABLE_R_MAG;
	}


	static void
	gen7_upload_samplers(struct brw_context *brw)
	{
	struct gl_context *ctx = &brw->intel.ctx;
	struct gen7_sampler_state *samplers;

	/* BRW_NEW_VERTEX_PROGRAM and BRW_NEW_FRAGMENT_PROGRAM */
	struct gl_program vs = (struct gl_program ) brw->vertex_program;
	struct gl_program fs = (struct gl_program ) brw->fragment_program;

	GLbitfield SamplersUsed = vs->SamplersUsed \| fs->SamplersUsed;

	brw->sampler.count = _mesa_fls(SamplersUsed);

	if (brw->sampler.count == 0)
	return;

	samplers = brw_state_batch(brw, AUB_TRACE_SAMPLER_STATE,
	brw->sampler.count * sizeof(*samplers),
	32, &brw->sampler.offset);
	memset(samplers, 0, brw->sampler.count * sizeof(*samplers));

	for (unsigned s = 0; s < brw->sampler.count; s++) {
	if (SamplersUsed & (1 << s)) {
	const unsigned unit = (fs->SamplersUsed & (1 << s)) ?
	fs->SamplerUnits[s] : vs->SamplerUnits[s];
	if (ctx->Texture.Unit[unit]._ReallyEnabled)
	gen7_update_sampler_state(brw, unit, s, &samplers[s]);
	}
	}

	brw->state.dirty.cache \|= CACHE_NEW_SAMPLER;
	}

	const struct brw_tracked_state gen7_samplers = {
	.dirty = {
	.mesa = _NEW_TEXTURE,
	.brw = BRW_NEW_BATCH \|
	BRW_NEW_VERTEX_PROGRAM \|
	BRW_NEW_FRAGMENT_PROGRAM,
	.cache = 0
	},
	.emit = gen7_upload_samplers,
	};