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Diffstat (limited to 'src/gallium/drivers/llvmpipe/lp_bld_sample.c')
-rw-r--r--src/gallium/drivers/llvmpipe/lp_bld_sample.c190
1 files changed, 190 insertions, 0 deletions
diff --git a/src/gallium/drivers/llvmpipe/lp_bld_sample.c b/src/gallium/drivers/llvmpipe/lp_bld_sample.c
new file mode 100644
index 00000000000..4d272bea87e
--- /dev/null
+++ b/src/gallium/drivers/llvmpipe/lp_bld_sample.c
@@ -0,0 +1,190 @@
+/**************************************************************************
+ *
+ * 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 -- common code.
+ *
+ * @author Jose Fonseca <jfonseca@vmware.com>
+ */
+
+#include "pipe/p_defines.h"
+#include "pipe/p_state.h"
+#include "util/u_format.h"
+#include "util/u_math.h"
+#include "lp_bld_debug.h"
+#include "lp_bld_const.h"
+#include "lp_bld_arit.h"
+#include "lp_bld_type.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->target = texture->target;
+ 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;
+ if(sampler->compare_mode) {
+ state->compare_mode = sampler->compare_mode;
+ state->compare_func = sampler->compare_func;
+ }
+ state->normalized_coords = sampler->normalized_coords;
+ state->prefilter = sampler->prefilter;
+}
+
+
+/**
+ * Gather elements from scatter positions in memory into a single vector.
+ *
+ * @param src_width src element width
+ * @param dst_width result element width (source will be expanded to fit)
+ * @param length length of the offsets,
+ * @param base_ptr base pointer, should be a i8 pointer type.
+ * @param offsets vector with offsets
+ */
+LLVMValueRef
+lp_build_gather(LLVMBuilderRef builder,
+ unsigned length,
+ unsigned src_width,
+ unsigned dst_width,
+ LLVMValueRef base_ptr,
+ LLVMValueRef offsets)
+{
+ LLVMTypeRef src_type = LLVMIntType(src_width);
+ LLVMTypeRef src_ptr_type = LLVMPointerType(src_type, 0);
+ LLVMTypeRef dst_elem_type = LLVMIntType(dst_width);
+ LLVMTypeRef dst_vec_type = LLVMVectorType(dst_elem_type, length);
+ LLVMValueRef res;
+ unsigned i;
+
+ res = LLVMGetUndef(dst_vec_type);
+ for(i = 0; i < length; ++i) {
+ LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), i, 0);
+ LLVMValueRef elem_offset;
+ LLVMValueRef elem_ptr;
+ LLVMValueRef elem;
+
+ elem_offset = LLVMBuildExtractElement(builder, offsets, index, "");
+ elem_ptr = LLVMBuildGEP(builder, base_ptr, &elem_offset, 1, "");
+ elem_ptr = LLVMBuildBitCast(builder, elem_ptr, src_ptr_type, "");
+ elem = LLVMBuildLoad(builder, elem_ptr, "");
+
+ assert(src_width <= dst_width);
+ if(src_width > dst_width)
+ elem = LLVMBuildTrunc(builder, elem, dst_elem_type, "");
+ if(src_width < dst_width)
+ elem = LLVMBuildZExt(builder, elem, dst_elem_type, "");
+
+ res = LLVMBuildInsertElement(builder, res, elem, index, "");
+ }
+
+ return res;
+}
+
+
+/**
+ * Compute the offset of a pixel.
+ *
+ * x, y, y_stride are vectors
+ */
+LLVMValueRef
+lp_build_sample_offset(struct lp_build_context *bld,
+ const struct util_format_description *format_desc,
+ LLVMValueRef x,
+ LLVMValueRef y,
+ LLVMValueRef y_stride,
+ LLVMValueRef data_ptr)
+{
+ LLVMValueRef x_stride;
+ LLVMValueRef offset;
+
+ x_stride = lp_build_const_scalar(bld->type, format_desc->block.bits/8);
+
+ if(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS) {
+ LLVMValueRef x_lo, x_hi;
+ LLVMValueRef y_lo, y_hi;
+ LLVMValueRef x_stride_lo, x_stride_hi;
+ LLVMValueRef y_stride_lo, y_stride_hi;
+ LLVMValueRef x_offset_lo, x_offset_hi;
+ LLVMValueRef y_offset_lo, y_offset_hi;
+ LLVMValueRef offset_lo, offset_hi;
+
+ x_lo = LLVMBuildAnd(bld->builder, x, bld->one, "");
+ y_lo = LLVMBuildAnd(bld->builder, y, bld->one, "");
+
+ x_hi = LLVMBuildLShr(bld->builder, x, bld->one, "");
+ y_hi = LLVMBuildLShr(bld->builder, y, bld->one, "");
+
+ x_stride_lo = x_stride;
+ y_stride_lo = lp_build_const_scalar(bld->type, 2*format_desc->block.bits/8);
+
+ x_stride_hi = lp_build_const_scalar(bld->type, 4*format_desc->block.bits/8);
+ y_stride_hi = LLVMBuildShl(bld->builder, y_stride, bld->one, "");
+
+ x_offset_lo = lp_build_mul(bld, x_lo, x_stride_lo);
+ y_offset_lo = lp_build_mul(bld, y_lo, y_stride_lo);
+ offset_lo = lp_build_add(bld, x_offset_lo, y_offset_lo);
+
+ x_offset_hi = lp_build_mul(bld, x_hi, x_stride_hi);
+ y_offset_hi = lp_build_mul(bld, y_hi, y_stride_hi);
+ offset_hi = lp_build_add(bld, x_offset_hi, y_offset_hi);
+
+ offset = lp_build_add(bld, offset_hi, offset_lo);
+ }
+ else {
+ LLVMValueRef x_offset;
+ LLVMValueRef y_offset;
+
+ x_offset = lp_build_mul(bld, x, x_stride);
+ y_offset = lp_build_mul(bld, y, y_stride);
+
+ offset = lp_build_add(bld, x_offset, y_offset);
+ }
+
+ return offset;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-24 12:12:40 +0000