#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_const.h"
+#include "lp_bld_debug.h"
+#include "lp_bld_flow.h"
#include "lp_bld_sample.h"
+#include "lp_bld_swizzle.h"
+#include "lp_bld_type.h"
/**
*/
state->format = view->format;
+ state->swizzle_r = view->swizzle_r;
+ state->swizzle_g = view->swizzle_g;
+ state->swizzle_b = view->swizzle_b;
+ state->swizzle_a = view->swizzle_a;
+
state->target = texture->target;
- state->pot_width = util_is_pot(texture->width0);
- state->pot_height = util_is_pot(texture->height0);
- state->pot_depth = util_is_pot(texture->depth0);
+ state->pot_width = util_is_power_of_two(texture->width0);
+ state->pot_height = util_is_power_of_two(texture->height0);
+ state->pot_depth = util_is_power_of_two(texture->depth0);
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->mag_img_filter = sampler->mag_img_filter;
- if (texture->last_level) {
+ if (view->last_level) {
state->min_mip_filter = sampler->min_mip_filter;
} else {
state->min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
}
+ /* If min_lod == max_lod we can greatly simplify mipmap selection.
+ * This is a case that occurs during automatic mipmap generation.
+ */
+ if (sampler->min_lod == sampler->max_lod) {
+ state->min_max_lod_equal = 1;
+ }
+
state->compare_mode = sampler->compare_mode;
if (sampler->compare_mode != PIPE_TEX_COMPARE_NONE) {
state->compare_func = sampler->compare_func;
}
state->normalized_coords = sampler->normalized_coords;
- state->lod_bias = sampler->lod_bias;
- state->min_lod = sampler->min_lod;
- state->max_lod = sampler->max_lod;
- state->border_color[0] = sampler->border_color[0];
- state->border_color[1] = sampler->border_color[1];
- state->border_color[2] = sampler->border_color[2];
- state->border_color[3] = sampler->border_color[3];
/*
* FIXME: Handle the remainder of pipe_sampler_view.
/**
- * Gather elements from scatter positions in memory into a single vector.
+ * Generate code to compute texture level of detail (lambda).
+ * \param ddx partial derivatives of (s, t, r, q) with respect to X
+ * \param ddy partial derivatives of (s, t, r, q) with respect to Y
+ * \param lod_bias optional float vector with the shader lod bias
+ * \param explicit_lod optional float vector with the explicit lod
+ * \param width scalar int texture width
+ * \param height scalar int texture height
+ * \param depth scalar int texture depth
*
- * @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
+ * XXX: The resulting lod is scalar, so ignore all but the first element of
+ * derivatives, lod_bias, etc that are passed by the shader.
*/
LLVMValueRef
-lp_build_gather(LLVMBuilderRef builder,
- unsigned length,
- unsigned src_width,
- unsigned dst_width,
- LLVMValueRef base_ptr,
- LLVMValueRef offsets)
+lp_build_lod_selector(struct lp_build_sample_context *bld,
+ unsigned unit,
+ const LLVMValueRef ddx[4],
+ const LLVMValueRef ddy[4],
+ LLVMValueRef lod_bias, /* optional */
+ LLVMValueRef explicit_lod, /* optional */
+ LLVMValueRef width,
+ LLVMValueRef height,
+ LLVMValueRef depth)
+
+{
+ LLVMValueRef min_lod =
+ bld->dynamic_state->min_lod(bld->dynamic_state, bld->builder, unit);
+
+ if (bld->static_state->min_max_lod_equal) {
+ /* User is forcing sampling from a particular mipmap level.
+ * This is hit during mipmap generation.
+ */
+ return min_lod;
+ }
+ else {
+ struct lp_build_context *float_bld = &bld->float_bld;
+ LLVMValueRef sampler_lod_bias =
+ bld->dynamic_state->lod_bias(bld->dynamic_state, bld->builder, unit);
+ LLVMValueRef max_lod =
+ bld->dynamic_state->max_lod(bld->dynamic_state, bld->builder, unit);
+ LLVMValueRef index0 = LLVMConstInt(LLVMInt32Type(), 0, 0);
+ LLVMValueRef lod;
+
+ if (explicit_lod) {
+ lod = LLVMBuildExtractElement(bld->builder, explicit_lod,
+ index0, "");
+ }
+ else {
+ const int dims = texture_dims(bld->static_state->target);
+ LLVMValueRef dsdx, dsdy;
+ LLVMValueRef dtdx = NULL, dtdy = NULL, drdx = NULL, drdy = NULL;
+ LLVMValueRef rho;
+
+ dsdx = LLVMBuildExtractElement(bld->builder, ddx[0], index0, "dsdx");
+ dsdx = lp_build_abs(float_bld, dsdx);
+ dsdy = LLVMBuildExtractElement(bld->builder, ddy[0], index0, "dsdy");
+ dsdy = lp_build_abs(float_bld, dsdy);
+ if (dims > 1) {
+ dtdx = LLVMBuildExtractElement(bld->builder, ddx[1], index0, "dtdx");
+ dtdx = lp_build_abs(float_bld, dtdx);
+ dtdy = LLVMBuildExtractElement(bld->builder, ddy[1], index0, "dtdy");
+ dtdy = lp_build_abs(float_bld, dtdy);
+ if (dims > 2) {
+ drdx = LLVMBuildExtractElement(bld->builder, ddx[2], index0, "drdx");
+ drdx = lp_build_abs(float_bld, drdx);
+ drdy = LLVMBuildExtractElement(bld->builder, ddy[2], index0, "drdy");
+ drdy = lp_build_abs(float_bld, drdy);
+ }
+ }
+
+ /* Compute rho = max of all partial derivatives scaled by texture size.
+ * XXX this could be vectorized somewhat
+ */
+ rho = LLVMBuildFMul(bld->builder,
+ lp_build_max(float_bld, dsdx, dsdy),
+ lp_build_int_to_float(float_bld, width), "");
+ if (dims > 1) {
+ LLVMValueRef max;
+ max = LLVMBuildFMul(bld->builder,
+ lp_build_max(float_bld, dtdx, dtdy),
+ lp_build_int_to_float(float_bld, height), "");
+ rho = lp_build_max(float_bld, rho, max);
+ if (dims > 2) {
+ max = LLVMBuildFMul(bld->builder,
+ lp_build_max(float_bld, drdx, drdy),
+ lp_build_int_to_float(float_bld, depth), "");
+ rho = lp_build_max(float_bld, rho, max);
+ }
+ }
+
+ /* compute lod = log2(rho) */
+ lod = lp_build_log2(float_bld, rho);
+
+ /* add shader lod bias */
+ if (lod_bias) {
+ lod_bias = LLVMBuildExtractElement(bld->builder, lod_bias,
+ index0, "");
+ lod = LLVMBuildFAdd(bld->builder, lod, lod_bias, "shader_lod_bias");
+ }
+ }
+
+ /* add sampler lod bias */
+ lod = LLVMBuildFAdd(bld->builder, lod, sampler_lod_bias, "sampler_lod_bias");
+
+ /* clamp lod */
+ lod = lp_build_clamp(float_bld, lod, min_lod, max_lod);
+
+ return lod;
+ }
+}
+
+
+/**
+ * For PIPE_TEX_MIPFILTER_NEAREST, convert float LOD to integer
+ * mipmap level index.
+ * Note: this is all scalar code.
+ * \param lod scalar float texture level of detail
+ * \param level_out returns integer
+ */
+void
+lp_build_nearest_mip_level(struct lp_build_sample_context *bld,
+ unsigned unit,
+ LLVMValueRef lod,
+ LLVMValueRef *level_out)
+{
+ struct lp_build_context *float_bld = &bld->float_bld;
+ struct lp_build_context *int_bld = &bld->int_bld;
+ LLVMValueRef last_level, level;
+
+ LLVMValueRef zero = LLVMConstInt(LLVMInt32Type(), 0, 0);
+
+ last_level = bld->dynamic_state->last_level(bld->dynamic_state,
+ bld->builder, unit);
+
+ /* convert float lod to integer */
+ level = lp_build_iround(float_bld, lod);
+
+ /* clamp level to legal range of levels */
+ *level_out = lp_build_clamp(int_bld, level, zero, last_level);
+}
+
+
+/**
+ * For PIPE_TEX_MIPFILTER_LINEAR, convert float LOD to integer to
+ * two (adjacent) mipmap level indexes. Later, we'll sample from those
+ * two mipmap levels and interpolate between them.
+ */
+void
+lp_build_linear_mip_levels(struct lp_build_sample_context *bld,
+ unsigned unit,
+ LLVMValueRef lod,
+ LLVMValueRef *level0_out,
+ LLVMValueRef *level1_out,
+ LLVMValueRef *weight_out)
{
- 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);
+ struct lp_build_context *float_bld = &bld->float_bld;
+ struct lp_build_context *int_bld = &bld->int_bld;
+ LLVMValueRef last_level, level;
+
+ last_level = bld->dynamic_state->last_level(bld->dynamic_state,
+ bld->builder, unit);
+
+ /* convert float lod to integer */
+ level = lp_build_ifloor(float_bld, lod);
+
+ /* compute level 0 and clamp to legal range of levels */
+ *level0_out = lp_build_clamp(int_bld, level,
+ int_bld->zero,
+ last_level);
+ /* compute level 1 and clamp to legal range of levels */
+ level = lp_build_add(int_bld, level, int_bld->one);
+ *level1_out = lp_build_clamp(int_bld, level,
+ int_bld->zero,
+ last_level);
+
+ *weight_out = lp_build_fract(float_bld, lod);
+}
+
+
+LLVMValueRef
+lp_build_get_mipmap_level(struct lp_build_sample_context *bld,
+ LLVMValueRef data_array, LLVMValueRef level)
+{
+ LLVMValueRef indexes[2], data_ptr;
+ indexes[0] = LLVMConstInt(LLVMInt32Type(), 0, 0);
+ indexes[1] = level;
+ data_ptr = LLVMBuildGEP(bld->builder, data_array, indexes, 2, "");
+ data_ptr = LLVMBuildLoad(bld->builder, data_ptr, "");
+ return data_ptr;
+}
+
+
+LLVMValueRef
+lp_build_get_const_mipmap_level(struct lp_build_sample_context *bld,
+ LLVMValueRef data_array, int level)
+{
+ LLVMValueRef lvl = LLVMConstInt(LLVMInt32Type(), level, 0);
+ return lp_build_get_mipmap_level(bld, data_array, lvl);
+}
+
+
+/**
+ * Codegen equivalent for u_minify().
+ * Return max(1, base_size >> level);
+ */
+static LLVMValueRef
+lp_build_minify(struct lp_build_sample_context *bld,
+ LLVMValueRef base_size,
+ LLVMValueRef level)
+{
+ LLVMValueRef size = LLVMBuildLShr(bld->builder, base_size, level, "minify");
+ size = lp_build_max(&bld->int_coord_bld, size, bld->int_coord_bld.one);
+ return size;
+}
+
+
+/**
+ * Dereference stride_array[mipmap_level] array to get a stride.
+ * Return stride as a vector.
+ */
+static LLVMValueRef
+lp_build_get_level_stride_vec(struct lp_build_sample_context *bld,
+ LLVMValueRef stride_array, LLVMValueRef level)
+{
+ LLVMValueRef indexes[2], stride;
+ indexes[0] = LLVMConstInt(LLVMInt32Type(), 0, 0);
+ indexes[1] = level;
+ stride = LLVMBuildGEP(bld->builder, stride_array, indexes, 2, "");
+ stride = LLVMBuildLoad(bld->builder, stride, "");
+ stride = lp_build_broadcast_scalar(&bld->int_coord_bld, stride);
+ return stride;
+}
+
+
+/**
+ * When sampling a mipmap, we need to compute the width, height, depth
+ * of the source levels from the level indexes. This helper function
+ * does that.
+ */
+void
+lp_build_mipmap_level_sizes(struct lp_build_sample_context *bld,
+ unsigned dims,
+ LLVMValueRef width_vec,
+ LLVMValueRef height_vec,
+ LLVMValueRef depth_vec,
+ LLVMValueRef ilevel0,
+ LLVMValueRef ilevel1,
+ LLVMValueRef row_stride_array,
+ LLVMValueRef img_stride_array,
+ LLVMValueRef *width0_vec,
+ LLVMValueRef *width1_vec,
+ LLVMValueRef *height0_vec,
+ LLVMValueRef *height1_vec,
+ LLVMValueRef *depth0_vec,
+ LLVMValueRef *depth1_vec,
+ LLVMValueRef *row_stride0_vec,
+ LLVMValueRef *row_stride1_vec,
+ LLVMValueRef *img_stride0_vec,
+ LLVMValueRef *img_stride1_vec)
+{
+ const unsigned mip_filter = bld->static_state->min_mip_filter;
+ LLVMValueRef ilevel0_vec, ilevel1_vec;
+
+ ilevel0_vec = lp_build_broadcast_scalar(&bld->int_coord_bld, ilevel0);
+ if (mip_filter == PIPE_TEX_MIPFILTER_LINEAR)
+ ilevel1_vec = lp_build_broadcast_scalar(&bld->int_coord_bld, ilevel1);
+
+ /*
+ * Compute width, height, depth at mipmap level 'ilevel0'
+ */
+ *width0_vec = lp_build_minify(bld, width_vec, ilevel0_vec);
+ if (dims >= 2) {
+ *height0_vec = lp_build_minify(bld, height_vec, ilevel0_vec);
+ *row_stride0_vec = lp_build_get_level_stride_vec(bld,
+ row_stride_array,
+ ilevel0);
+ if (dims == 3 || bld->static_state->target == PIPE_TEXTURE_CUBE) {
+ *img_stride0_vec = lp_build_get_level_stride_vec(bld,
+ img_stride_array,
+ ilevel0);
+ if (dims == 3) {
+ *depth0_vec = lp_build_minify(bld, depth_vec, ilevel0_vec);
+ }
+ }
+ }
+ if (mip_filter == PIPE_TEX_MIPFILTER_LINEAR) {
+ /* compute width, height, depth for second mipmap level at 'ilevel1' */
+ *width1_vec = lp_build_minify(bld, width_vec, ilevel1_vec);
+ if (dims >= 2) {
+ *height1_vec = lp_build_minify(bld, height_vec, ilevel1_vec);
+ *row_stride1_vec = lp_build_get_level_stride_vec(bld,
+ row_stride_array,
+ ilevel1);
+ if (dims == 3 || bld->static_state->target == PIPE_TEXTURE_CUBE) {
+ *img_stride1_vec = lp_build_get_level_stride_vec(bld,
+ img_stride_array,
+ ilevel1);
+ if (dims == 3) {
+ *depth1_vec = lp_build_minify(bld, depth_vec, ilevel1_vec);
+ }
+ }
+ }
+ }
+}
+
+
+
+/** Helper used by lp_build_cube_lookup() */
+static LLVMValueRef
+lp_build_cube_ima(struct lp_build_context *coord_bld, LLVMValueRef coord)
+{
+ /* ima = -0.5 / abs(coord); */
+ LLVMValueRef negHalf = lp_build_const_vec(coord_bld->type, -0.5);
+ LLVMValueRef absCoord = lp_build_abs(coord_bld, coord);
+ LLVMValueRef ima = lp_build_div(coord_bld, negHalf, absCoord);
+ return ima;
+}
+
+
+/**
+ * Helper used by lp_build_cube_lookup()
+ * \param sign scalar +1 or -1
+ * \param coord float vector
+ * \param ima float vector
+ */
+static LLVMValueRef
+lp_build_cube_coord(struct lp_build_context *coord_bld,
+ LLVMValueRef sign, int negate_coord,
+ LLVMValueRef coord, LLVMValueRef ima)
+{
+ /* return negate(coord) * ima * sign + 0.5; */
+ LLVMValueRef half = lp_build_const_vec(coord_bld->type, 0.5);
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, "");
+
+ assert(negate_coord == +1 || negate_coord == -1);
+
+ if (negate_coord == -1) {
+ coord = lp_build_negate(coord_bld, coord);
}
+ res = lp_build_mul(coord_bld, coord, ima);
+ if (sign) {
+ sign = lp_build_broadcast_scalar(coord_bld, sign);
+ res = lp_build_mul(coord_bld, res, sign);
+ }
+ res = lp_build_add(coord_bld, res, half);
+
+ return res;
+}
+
+
+/** Helper used by lp_build_cube_lookup()
+ * Return (major_coord >= 0) ? pos_face : neg_face;
+ */
+static LLVMValueRef
+lp_build_cube_face(struct lp_build_sample_context *bld,
+ LLVMValueRef major_coord,
+ unsigned pos_face, unsigned neg_face)
+{
+ LLVMValueRef cmp = LLVMBuildFCmp(bld->builder, LLVMRealUGE,
+ major_coord,
+ bld->float_bld.zero, "");
+ LLVMValueRef pos = LLVMConstInt(LLVMInt32Type(), pos_face, 0);
+ LLVMValueRef neg = LLVMConstInt(LLVMInt32Type(), neg_face, 0);
+ LLVMValueRef res = LLVMBuildSelect(bld->builder, cmp, pos, neg, "");
return res;
}
+
+/**
+ * Generate code to do cube face selection and compute per-face texcoords.
+ */
+void
+lp_build_cube_lookup(struct lp_build_sample_context *bld,
+ LLVMValueRef s,
+ LLVMValueRef t,
+ LLVMValueRef r,
+ LLVMValueRef *face,
+ LLVMValueRef *face_s,
+ LLVMValueRef *face_t)
+{
+ struct lp_build_context *float_bld = &bld->float_bld;
+ struct lp_build_context *coord_bld = &bld->coord_bld;
+ LLVMValueRef rx, ry, rz;
+ LLVMValueRef arx, ary, arz;
+ LLVMValueRef c25 = LLVMConstReal(LLVMFloatType(), 0.25);
+ LLVMValueRef arx_ge_ary, arx_ge_arz;
+ LLVMValueRef ary_ge_arx, ary_ge_arz;
+ LLVMValueRef arx_ge_ary_arz, ary_ge_arx_arz;
+ LLVMValueRef rx_pos, ry_pos, rz_pos;
+
+ assert(bld->coord_bld.type.length == 4);
+
+ /*
+ * Use the average of the four pixel's texcoords to choose the face.
+ */
+ rx = lp_build_mul(float_bld, c25,
+ lp_build_sum_vector(&bld->coord_bld, s));
+ ry = lp_build_mul(float_bld, c25,
+ lp_build_sum_vector(&bld->coord_bld, t));
+ rz = lp_build_mul(float_bld, c25,
+ lp_build_sum_vector(&bld->coord_bld, r));
+
+ arx = lp_build_abs(float_bld, rx);
+ ary = lp_build_abs(float_bld, ry);
+ arz = lp_build_abs(float_bld, rz);
+
+ /*
+ * Compare sign/magnitude of rx,ry,rz to determine face
+ */
+ arx_ge_ary = LLVMBuildFCmp(bld->builder, LLVMRealUGE, arx, ary, "");
+ arx_ge_arz = LLVMBuildFCmp(bld->builder, LLVMRealUGE, arx, arz, "");
+ ary_ge_arx = LLVMBuildFCmp(bld->builder, LLVMRealUGE, ary, arx, "");
+ ary_ge_arz = LLVMBuildFCmp(bld->builder, LLVMRealUGE, ary, arz, "");
+
+ arx_ge_ary_arz = LLVMBuildAnd(bld->builder, arx_ge_ary, arx_ge_arz, "");
+ ary_ge_arx_arz = LLVMBuildAnd(bld->builder, ary_ge_arx, ary_ge_arz, "");
+
+ rx_pos = LLVMBuildFCmp(bld->builder, LLVMRealUGE, rx, float_bld->zero, "");
+ ry_pos = LLVMBuildFCmp(bld->builder, LLVMRealUGE, ry, float_bld->zero, "");
+ rz_pos = LLVMBuildFCmp(bld->builder, LLVMRealUGE, rz, float_bld->zero, "");
+
+ {
+ struct lp_build_flow_context *flow_ctx;
+ struct lp_build_if_state if_ctx;
+
+ flow_ctx = lp_build_flow_create(bld->builder);
+ lp_build_flow_scope_begin(flow_ctx);
+
+ *face_s = bld->coord_bld.undef;
+ *face_t = bld->coord_bld.undef;
+ *face = bld->int_bld.undef;
+
+ lp_build_name(*face_s, "face_s");
+ lp_build_name(*face_t, "face_t");
+ lp_build_name(*face, "face");
+
+ lp_build_flow_scope_declare(flow_ctx, face_s);
+ lp_build_flow_scope_declare(flow_ctx, face_t);
+ lp_build_flow_scope_declare(flow_ctx, face);
+
+ lp_build_if(&if_ctx, flow_ctx, bld->builder, arx_ge_ary_arz);
+ {
+ /* +/- X face */
+ LLVMValueRef sign = lp_build_sgn(float_bld, rx);
+ LLVMValueRef ima = lp_build_cube_ima(coord_bld, s);
+ *face_s = lp_build_cube_coord(coord_bld, sign, +1, r, ima);
+ *face_t = lp_build_cube_coord(coord_bld, NULL, +1, t, ima);
+ *face = lp_build_cube_face(bld, rx,
+ PIPE_TEX_FACE_POS_X,
+ PIPE_TEX_FACE_NEG_X);
+ }
+ lp_build_else(&if_ctx);
+ {
+ struct lp_build_flow_context *flow_ctx2;
+ struct lp_build_if_state if_ctx2;
+
+ LLVMValueRef face_s2 = bld->coord_bld.undef;
+ LLVMValueRef face_t2 = bld->coord_bld.undef;
+ LLVMValueRef face2 = bld->int_bld.undef;
+
+ flow_ctx2 = lp_build_flow_create(bld->builder);
+ lp_build_flow_scope_begin(flow_ctx2);
+ lp_build_flow_scope_declare(flow_ctx2, &face_s2);
+ lp_build_flow_scope_declare(flow_ctx2, &face_t2);
+ lp_build_flow_scope_declare(flow_ctx2, &face2);
+
+ ary_ge_arx_arz = LLVMBuildAnd(bld->builder, ary_ge_arx, ary_ge_arz, "");
+
+ lp_build_if(&if_ctx2, flow_ctx2, bld->builder, ary_ge_arx_arz);
+ {
+ /* +/- Y face */
+ LLVMValueRef sign = lp_build_sgn(float_bld, ry);
+ LLVMValueRef ima = lp_build_cube_ima(coord_bld, t);
+ face_s2 = lp_build_cube_coord(coord_bld, NULL, -1, s, ima);
+ face_t2 = lp_build_cube_coord(coord_bld, sign, -1, r, ima);
+ face2 = lp_build_cube_face(bld, ry,
+ PIPE_TEX_FACE_POS_Y,
+ PIPE_TEX_FACE_NEG_Y);
+ }
+ lp_build_else(&if_ctx2);
+ {
+ /* +/- Z face */
+ LLVMValueRef sign = lp_build_sgn(float_bld, rz);
+ LLVMValueRef ima = lp_build_cube_ima(coord_bld, r);
+ face_s2 = lp_build_cube_coord(coord_bld, sign, -1, s, ima);
+ face_t2 = lp_build_cube_coord(coord_bld, NULL, +1, t, ima);
+ face2 = lp_build_cube_face(bld, rz,
+ PIPE_TEX_FACE_POS_Z,
+ PIPE_TEX_FACE_NEG_Z);
+ }
+ lp_build_endif(&if_ctx2);
+ lp_build_flow_scope_end(flow_ctx2);
+ lp_build_flow_destroy(flow_ctx2);
+ *face_s = face_s2;
+ *face_t = face_t2;
+ *face = face2;
+ }
+
+ lp_build_endif(&if_ctx);
+ lp_build_flow_scope_end(flow_ctx);
+ lp_build_flow_destroy(flow_ctx);
+ }
+}
+
+
+/**
+ * Compute the partial offset of a pixel block along an arbitrary axis.
+ *
+ * @param coord coordinate in pixels
+ * @param stride number of bytes between rows of successive pixel blocks
+ * @param block_length number of pixels in a pixels block along the coordinate
+ * axis
+ * @param out_offset resulting relative offset of the pixel block in bytes
+ * @param out_subcoord resulting sub-block pixel coordinate
+ */
+void
+lp_build_sample_partial_offset(struct lp_build_context *bld,
+ unsigned block_length,
+ LLVMValueRef coord,
+ LLVMValueRef stride,
+ LLVMValueRef *out_offset,
+ LLVMValueRef *out_subcoord)
+{
+ LLVMValueRef offset;
+ LLVMValueRef subcoord;
+
+ if (block_length == 1) {
+ subcoord = bld->zero;
+ }
+ else {
+ /*
+ * Pixel blocks have power of two dimensions. LLVM should convert the
+ * rem/div to bit arithmetic.
+ * TODO: Verify this.
+ * It does indeed BUT it does transform it to scalar (and back) when doing so
+ * (using roughly extract, shift/and, mov, unpack) (llvm 2.7).
+ * The generated code looks seriously unfunny and is quite expensive.
+ */
+#if 0
+ LLVMValueRef block_width = lp_build_const_int_vec(bld->type, block_length);
+ subcoord = LLVMBuildURem(bld->builder, coord, block_width, "");
+ coord = LLVMBuildUDiv(bld->builder, coord, block_width, "");
+#else
+ unsigned logbase2 = util_unsigned_logbase2(block_length);
+ LLVMValueRef block_shift = lp_build_const_int_vec(bld->type, logbase2);
+ LLVMValueRef block_mask = lp_build_const_int_vec(bld->type, block_length - 1);
+ subcoord = LLVMBuildAnd(bld->builder, coord, block_mask, "");
+ coord = LLVMBuildLShr(bld->builder, coord, block_shift, "");
+#endif
+ }
+
+ offset = lp_build_mul(bld, coord, stride);
+
+ assert(out_offset);
+ assert(out_subcoord);
+
+ *out_offset = offset;
+ *out_subcoord = subcoord;
+}
+
+
/**
* Compute the offset of a pixel block.
*
- * x, y, z, y_stride, z_stride are vectors, and they refer to pixel blocks, as
- * per format description, and not individual pixels.
+ * x, y, z, y_stride, z_stride are vectors, and they refer to pixels.
+ *
+ * Returns the relative offset and i,j sub-block coordinates
*/
-LLVMValueRef
+void
lp_build_sample_offset(struct lp_build_context *bld,
const struct util_format_description *format_desc,
LLVMValueRef x,
LLVMValueRef y,
LLVMValueRef z,
LLVMValueRef y_stride,
- LLVMValueRef z_stride)
+ LLVMValueRef z_stride,
+ LLVMValueRef *out_offset,
+ LLVMValueRef *out_i,
+ LLVMValueRef *out_j)
{
LLVMValueRef x_stride;
LLVMValueRef offset;
x_stride = lp_build_const_vec(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;
-
- /* XXX 1D & 3D addressing not done yet */
- assert(!z);
- assert(!z_stride);
-
- 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_vec(bld->type, 2*format_desc->block.bits/8);
-
- x_stride_hi = lp_build_const_vec(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);
+ lp_build_sample_partial_offset(bld,
+ format_desc->block.width,
+ x, x_stride,
+ &offset, out_i);
+
+ if (y && y_stride) {
+ LLVMValueRef y_offset;
+ lp_build_sample_partial_offset(bld,
+ format_desc->block.height,
+ y, y_stride,
+ &y_offset, out_j);
+ offset = lp_build_add(bld, offset, y_offset);
}
else {
- offset = lp_build_mul(bld, x, x_stride);
-
- if (y && y_stride) {
- LLVMValueRef y_offset = lp_build_mul(bld, y, y_stride);
- offset = lp_build_add(bld, offset, y_offset);
- }
+ *out_j = bld->zero;
+ }
- if (z && z_stride) {
- LLVMValueRef z_offset = lp_build_mul(bld, z, z_stride);
- offset = lp_build_add(bld, offset, z_offset);
- }
+ if (z && z_stride) {
+ LLVMValueRef z_offset;
+ LLVMValueRef k;
+ lp_build_sample_partial_offset(bld,
+ 1, /* pixel blocks are always 2D */
+ z, z_stride,
+ &z_offset, &k);
+ offset = lp_build_add(bld, offset, z_offset);
}
- return offset;
+ *out_offset = offset;
}
projects / mesa.git / blobdiff