--- /dev/null
+/**************************************************************************
+ *
+ * Copyright 2009 VMware, Inc.
+ * 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 VMWARE 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.
+ *
+ **************************************************************************/
+
+/**
+ * @file
+ * Texture sampling.
+ *
+ * @author Jose Fonseca <jfonseca@vmware.com>
+ */
+
+#ifndef LP_BLD_SAMPLE_H
+#define LP_BLD_SAMPLE_H
+
+
+#include <llvm-c/Core.h>
+
+struct pipe_texture;
+struct pipe_sampler_state;
+union lp_type;
+
+
+/**
+ * Sampler static state.
+ *
+ * These are the bits of state from pipe_texture and pipe_sampler_state that
+ * are embedded in the generated code.
+ */
+struct lp_sampler_static_state
+{
+ /* pipe_texture's state */
+ enum pipe_format format;
+ unsigned pot_width:1;
+ unsigned pot_height:1;
+ unsigned pot_depth:1;
+
+ /* pipe_sampler_state's state */
+ unsigned wrap_s:3;
+ unsigned wrap_t:3;
+ unsigned wrap_r:3;
+ unsigned min_img_filter:2;
+ unsigned min_mip_filter:2;
+ unsigned mag_img_filter:2;
+ unsigned compare_mode:1;
+ unsigned compare_func:3;
+ unsigned normalized_coords:1;
+ unsigned prefilter:4;
+};
+
+
+/**
+ * Sampler dynamic state.
+ *
+ * These are the bits of state from pipe_texture and pipe_sampler_state that
+ * are computed in runtime.
+ *
+ * There are obtained through callbacks, as we don't want to tie the texture
+ * sampling code generation logic to any particular texture layout or pipe
+ * driver.
+ */
+struct lp_sampler_dynamic_state
+{
+
+ /** Obtain the base texture width. */
+ LLVMValueRef
+ (*width)( struct lp_sampler_dynamic_state *state,
+ LLVMBuilderRef builder,
+ unsigned unit);
+
+ /** Obtain the base texture height. */
+ LLVMValueRef
+ (*height)( struct lp_sampler_dynamic_state *state,
+ LLVMBuilderRef builder,
+ unsigned unit);
+
+ LLVMValueRef
+ (*stride)( struct lp_sampler_dynamic_state *state,
+ LLVMBuilderRef builder,
+ unsigned unit);
+
+ LLVMValueRef
+ (*data_ptr)( struct lp_sampler_dynamic_state *state,
+ LLVMBuilderRef builder,
+ unsigned unit);
+
+};
+
+
+/**
+ * Derive the sampler static state.
+ */
+void
+lp_sampler_static_state(struct lp_sampler_static_state *state,
+ const struct pipe_texture *texture,
+ const struct pipe_sampler_state *sampler);
+
+
+void
+lp_build_sample_soa(LLVMBuilderRef builder,
+ const struct lp_sampler_static_state *static_state,
+ struct lp_sampler_dynamic_state *dynamic_state,
+ union lp_type fp_type,
+ unsigned unit,
+ unsigned num_coords,
+ const LLVMValueRef *coords,
+ LLVMValueRef lodbias,
+ LLVMValueRef *texel);
+
+
+
+#endif /* LP_BLD_SAMPLE_H */
--- /dev/null
+/**************************************************************************
+ *
+ * Copyright 2009 VMware, Inc.
+ * 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 VMWARE 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.
+ *
+ **************************************************************************/
+
+/**
+ * @file
+ * Texture sampling.
+ *
+ * @author Jose Fonseca <jfonseca@vmware.com>
+ */
+
+#include "pipe/p_defines.h"
+#include "pipe/p_state.h"
+#include "util/u_debug.h"
+#include "util/u_memory.h"
+#include "util/u_math.h"
+#include "util/u_format.h"
+#include "lp_bld_debug.h"
+#include "lp_bld_type.h"
+#include "lp_bld_const.h"
+#include "lp_bld_arit.h"
+#include "lp_bld_swizzle.h"
+#include "lp_bld_format.h"
+#include "lp_bld_sample.h"
+
+
+void
+lp_sampler_static_state(struct lp_sampler_static_state *state,
+ const struct pipe_texture *texture,
+ const struct pipe_sampler_state *sampler)
+{
+ memset(state, 0, sizeof *state);
+
+ if(!texture)
+ return;
+
+ if(!sampler)
+ return;
+
+ state->format = texture->format;
+ state->pot_width = util_is_pot(texture->width[0]);
+ state->pot_height = util_is_pot(texture->height[0]);
+ state->pot_depth = util_is_pot(texture->depth[0]);
+
+ state->wrap_s = sampler->wrap_s;
+ state->wrap_t = sampler->wrap_t;
+ state->wrap_r = sampler->wrap_r;
+ state->min_img_filter = sampler->min_img_filter;
+ state->min_mip_filter = sampler->min_mip_filter;
+ state->mag_img_filter = sampler->mag_img_filter;
+ state->compare_mode = sampler->compare_mode;
+ state->compare_func = sampler->compare_func;
+ state->normalized_coords = sampler->normalized_coords;
+ state->prefilter = sampler->prefilter;
+}
+
+
+
+/**
+ * Keep all information for sampling code generation in a single place.
+ */
+struct lp_build_sample_context
+{
+ LLVMBuilderRef builder;
+
+ const struct lp_sampler_static_state *static_state;
+
+ struct lp_sampler_dynamic_state *dynamic_state;
+
+ const struct util_format_description *format_desc;
+
+ /** Incoming coordinates type and build context */
+ union lp_type coord_type;
+ struct lp_build_context coord_bld;
+
+ /** Integer coordinates */
+ union lp_type int_coord_type;
+ struct lp_build_context int_coord_bld;
+
+ /** Output texels type and build context */
+ union lp_type texel_type;
+ struct lp_build_context texel_bld;
+};
+
+
+static void
+lp_build_sample_texel(struct lp_build_sample_context *bld,
+ LLVMValueRef x,
+ LLVMValueRef y,
+ LLVMValueRef y_stride,
+ LLVMValueRef data_ptr,
+ LLVMValueRef *texel)
+{
+ LLVMValueRef x_stride;
+ LLVMValueRef x_offset;
+ LLVMValueRef y_offset;
+ LLVMValueRef offset;
+
+ x_stride = lp_build_const_scalar(bld->int_coord_type, bld->format_desc->block.bits/8);
+
+ x_offset = lp_build_mul(&bld->int_coord_bld, x, x_stride);
+ y_offset = lp_build_mul(&bld->int_coord_bld, y, y_stride);
+
+ offset = lp_build_add(&bld->int_coord_bld, x_offset, y_offset);
+
+ lp_build_load_rgba_soa(bld->builder,
+ bld->format_desc,
+ bld->texel_type,
+ data_ptr,
+ offset,
+ texel);
+}
+
+
+static LLVMValueRef
+lp_build_sample_wrap(struct lp_build_sample_context *bld,
+ LLVMValueRef coord,
+ LLVMValueRef length,
+ boolean is_pot,
+ unsigned wrap_mode)
+{
+ struct lp_build_context *int_coord_bld = &bld->int_coord_bld;
+ LLVMValueRef length_minus_one;
+
+ length_minus_one = lp_build_sub(int_coord_bld, length, int_coord_bld->one);
+
+ switch(wrap_mode) {
+ case PIPE_TEX_WRAP_REPEAT:
+ if(is_pot)
+ coord = LLVMBuildAnd(bld->builder, coord, length_minus_one, "");
+ else
+ /* Signed remainder won't give the right results for negative
+ * dividends but unsigned remainder does.*/
+ coord = LLVMBuildURem(bld->builder, coord, length, "");
+ break;
+
+ case PIPE_TEX_WRAP_CLAMP:
+ coord = lp_build_max(int_coord_bld, coord, int_coord_bld->zero);
+ coord = lp_build_min(int_coord_bld, coord, length_minus_one);
+ break;
+
+ case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
+ case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
+ case PIPE_TEX_WRAP_MIRROR_REPEAT:
+ case PIPE_TEX_WRAP_MIRROR_CLAMP:
+ case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE:
+ case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER:
+ default:
+ assert(0);
+ }
+
+ return coord;
+}
+
+
+static void
+lp_build_sample_2d_nearest_soa(struct lp_build_sample_context *bld,
+ LLVMValueRef s,
+ LLVMValueRef t,
+ LLVMValueRef width,
+ LLVMValueRef height,
+ LLVMValueRef stride,
+ LLVMValueRef data_ptr,
+ LLVMValueRef *texel)
+{
+ LLVMValueRef x;
+ LLVMValueRef y;
+
+ x = lp_build_ifloor(&bld->coord_bld, s);
+ y = lp_build_ifloor(&bld->coord_bld, t);
+
+ x = lp_build_sample_wrap(bld, x, width, bld->static_state->pot_width, bld->static_state->wrap_s);
+ y = lp_build_sample_wrap(bld, y, height, bld->static_state->pot_height, bld->static_state->wrap_t);
+
+ lp_build_sample_texel(bld, x, y, stride, data_ptr, texel);
+}
+
+
+static void
+lp_build_sample_2d_linear_soa(struct lp_build_sample_context *bld,
+ LLVMValueRef s,
+ LLVMValueRef t,
+ LLVMValueRef width,
+ LLVMValueRef height,
+ LLVMValueRef stride,
+ LLVMValueRef data_ptr,
+ LLVMValueRef *texel)
+{
+ LLVMValueRef half;
+ LLVMValueRef s_ipart;
+ LLVMValueRef t_ipart;
+ LLVMValueRef s_fpart;
+ LLVMValueRef t_fpart;
+ LLVMValueRef x0, x1;
+ LLVMValueRef y0, y1;
+ LLVMValueRef neighbors[2][2][4];
+ unsigned chan;
+
+ half = lp_build_const_scalar(bld->coord_type, 0.5);
+ s = lp_build_sub(&bld->coord_bld, s, half);
+ t = lp_build_sub(&bld->coord_bld, t, half);
+
+ s_ipart = lp_build_floor(&bld->coord_bld, s);
+ t_ipart = lp_build_floor(&bld->coord_bld, t);
+
+ s_fpart = lp_build_sub(&bld->coord_bld, s, s_ipart);
+ t_fpart = lp_build_sub(&bld->coord_bld, t, t_ipart);
+
+ x0 = lp_build_int(&bld->coord_bld, s_ipart);
+ y0 = lp_build_int(&bld->coord_bld, t_ipart);
+
+ x0 = lp_build_sample_wrap(bld, x0, width, bld->static_state->pot_width, bld->static_state->wrap_s);
+ y0 = lp_build_sample_wrap(bld, y0, height, bld->static_state->pot_height, bld->static_state->wrap_t);
+
+ x1 = lp_build_add(&bld->int_coord_bld, x0, bld->int_coord_bld.one);
+ y1 = lp_build_add(&bld->int_coord_bld, y0, bld->int_coord_bld.one);
+
+ x1 = lp_build_sample_wrap(bld, x1, width, bld->static_state->pot_width, bld->static_state->wrap_s);
+ y1 = lp_build_sample_wrap(bld, y1, height, bld->static_state->pot_height, bld->static_state->wrap_t);
+
+ lp_build_sample_texel(bld, x0, y0, stride, data_ptr, neighbors[0][0]);
+ lp_build_sample_texel(bld, x1, y0, stride, data_ptr, neighbors[0][1]);
+ lp_build_sample_texel(bld, x0, y1, stride, data_ptr, neighbors[1][0]);
+ lp_build_sample_texel(bld, x1, y1, stride, data_ptr, neighbors[1][1]);
+
+ /* TODO: Don't interpolate missing channels */
+ for(chan = 0; chan < 4; ++chan) {
+ switch(bld->format_desc->swizzle[chan]) {
+ case UTIL_FORMAT_SWIZZLE_X:
+ case UTIL_FORMAT_SWIZZLE_Y:
+ case UTIL_FORMAT_SWIZZLE_Z:
+ case UTIL_FORMAT_SWIZZLE_W:
+ texel[chan] = lp_build_lerp_2d(&bld->texel_bld,
+ s_fpart, t_fpart,
+ neighbors[0][0][chan],
+ neighbors[0][1][chan],
+ neighbors[1][0][chan],
+ neighbors[1][1][chan]);
+ break;
+ case UTIL_FORMAT_SWIZZLE_0:
+ texel[chan] = bld->texel_bld.zero;
+ break;
+ case UTIL_FORMAT_SWIZZLE_1:
+ texel[chan] = bld->texel_bld.one;
+ break;
+ default:
+ assert(0);
+ texel[chan] = bld->texel_bld.undef;
+ break;
+ }
+ }
+}
+
+
+void
+lp_build_sample_soa(LLVMBuilderRef builder,
+ const struct lp_sampler_static_state *static_state,
+ struct lp_sampler_dynamic_state *dynamic_state,
+ union lp_type type,
+ unsigned unit,
+ unsigned num_coords,
+ const LLVMValueRef *coords,
+ LLVMValueRef lodbias,
+ LLVMValueRef *texel)
+{
+ struct lp_build_sample_context bld;
+ LLVMValueRef width;
+ LLVMValueRef height;
+ LLVMValueRef stride;
+ LLVMValueRef data_ptr;
+ LLVMValueRef s;
+ LLVMValueRef t;
+ LLVMValueRef p;
+
+ /* Setup our build context */
+ memset(&bld, 0, sizeof bld);
+ bld.builder = builder;
+ bld.static_state = static_state;
+ bld.dynamic_state = dynamic_state;
+ bld.format_desc = util_format_description(static_state->format);
+ bld.coord_type = type;
+ bld.int_coord_type = lp_int_type(type);
+ bld.texel_type = type;
+ lp_build_context_init(&bld.coord_bld, builder, bld.coord_type);
+ lp_build_context_init(&bld.int_coord_bld, builder, bld.int_coord_type);
+ lp_build_context_init(&bld.texel_bld, builder, bld.texel_type);
+
+ /* Get the dynamic state */
+ width = dynamic_state->width(dynamic_state, builder, unit);
+ height = dynamic_state->height(dynamic_state, builder, unit);
+ stride = dynamic_state->stride(dynamic_state, builder, unit);
+ data_ptr = dynamic_state->data_ptr(dynamic_state, builder, unit);
+
+ s = coords[0];
+ t = coords[1];
+ p = coords[2];
+
+ width = lp_build_broadcast_scalar(&bld.int_coord_bld, width);
+ height = lp_build_broadcast_scalar(&bld.int_coord_bld, height);
+ stride = lp_build_broadcast_scalar(&bld.int_coord_bld, stride);
+
+ if(static_state->normalized_coords) {
+ LLVMTypeRef coord_vec_type = lp_build_vec_type(bld.coord_type);
+ LLVMValueRef fp_width = LLVMBuildSIToFP(builder, width, coord_vec_type, "");
+ LLVMValueRef fp_height = LLVMBuildSIToFP(builder, height, coord_vec_type, "");
+ s = lp_build_mul(&bld.coord_bld, s, fp_width);
+ t = lp_build_mul(&bld.coord_bld, t, fp_height);
+ }
+
+ switch (static_state->min_img_filter) {
+ case PIPE_TEX_FILTER_NEAREST:
+ lp_build_sample_2d_nearest_soa(&bld, s, t, width, height, stride, data_ptr, texel);
+ break;
+ case PIPE_TEX_FILTER_LINEAR:
+ case PIPE_TEX_FILTER_ANISO:
+ lp_build_sample_2d_linear_soa(&bld, s, t, width, height, stride, data_ptr, texel);
+ break;
+ }
+}
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