#include "lp_bld_gather.h"
#include "lp_bld_format.h"
#include "lp_bld_sample.h"
+#include "lp_bld_quad.h"
/**
/**
* Generate code to compute texture level of detail (lambda).
- * \param s vector of texcoord s values
- * \param t vector of texcoord t values
- * \param r vector of texcoord r values
+ * \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
*/
static LLVMValueRef
lp_build_lod_selector(struct lp_build_sample_context *bld,
- LLVMValueRef s,
- LLVMValueRef t,
- LLVMValueRef r,
- const LLVMValueRef *ddx,
- const LLVMValueRef *ddy,
+ const LLVMValueRef ddx[4],
+ const LLVMValueRef ddy[4],
LLVMValueRef lod_bias, /* optional */
LLVMValueRef explicit_lod, /* optional */
LLVMValueRef width,
LLVMValueRef dtdx = NULL, dtdy = NULL, drdx = NULL, drdy = NULL;
LLVMValueRef rho;
- /*
- * dsdx = abs(s[1] - s[0]);
- * dsdy = abs(s[2] - s[0]);
- * dtdx = abs(t[1] - t[0]);
- * dtdy = abs(t[2] - t[0]);
- * drdx = abs(r[1] - r[0]);
- * drdy = abs(r[2] - r[0]);
- */
dsdx = LLVMBuildExtractElement(bld->builder, ddx[0], index0, "dsdx");
dsdx = lp_build_abs(float_bld, dsdx);
dsdy = LLVMBuildExtractElement(bld->builder, ddy[0], index0, "dsdy");
bld->builder, unit);
/* convert float lod to integer */
- level = lp_build_itrunc(float_bld, lod);
+ 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);
/**
- * Generate code to do cube face selection and per-face texcoords.
+ * Generate code to do cube face selection and compute per-face texcoords.
*/
static void
lp_build_cube_lookup(struct lp_build_sample_context *bld,
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;
int chan;
if (img_filter == PIPE_TEX_FILTER_NEAREST) {
+ /* sample the first mipmap level */
lp_build_sample_image_nearest(bld,
width0_vec, height0_vec, depth0_vec,
row_stride0_vec, img_stride0_vec,
data_ptr0, s, t, r, colors0);
if (mip_filter == PIPE_TEX_MIPFILTER_LINEAR) {
- /* sample the second mipmap level, and interp */
+ /* sample the second mipmap level */
lp_build_sample_image_nearest(bld,
width1_vec, height1_vec, depth1_vec,
row_stride1_vec, img_stride1_vec,
else {
assert(img_filter == PIPE_TEX_FILTER_LINEAR);
+ /* sample the first mipmap level */
lp_build_sample_image_linear(bld,
width0_vec, height0_vec, depth0_vec,
row_stride0_vec, img_stride0_vec,
data_ptr0, s, t, r, colors0);
if (mip_filter == PIPE_TEX_MIPFILTER_LINEAR) {
- /* sample the second mipmap level, and interp */
+ /* sample the second mipmap level */
lp_build_sample_image_linear(bld,
width1_vec, height1_vec, depth1_vec,
row_stride1_vec, img_stride1_vec,
LLVMValueRef *colors_out)
{
struct lp_build_context *float_bld = &bld->float_bld;
- const unsigned mip_filter = bld->static_state->min_mip_filter;
+ /*const*/ unsigned mip_filter = bld->static_state->min_mip_filter;
const unsigned min_filter = bld->static_state->min_img_filter;
const unsigned mag_filter = bld->static_state->mag_img_filter;
const int dims = texture_dims(bld->static_state->target);
LLVMValueRef row_stride0_vec = NULL, row_stride1_vec = NULL;
LLVMValueRef img_stride0_vec = NULL, img_stride1_vec = NULL;
LLVMValueRef data_ptr0, data_ptr1 = NULL;
+ LLVMValueRef face_ddx[4], face_ddy[4];
/*
printf("%s mip %d min %d mag %d\n", __FUNCTION__,
mip_filter, min_filter, mag_filter);
*/
+ /*
+ * Choose cube face, recompute texcoords and derivatives for the chosen face.
+ */
+ if (bld->static_state->target == PIPE_TEXTURE_CUBE) {
+ LLVMValueRef face, face_s, face_t;
+ lp_build_cube_lookup(bld, s, t, r, &face, &face_s, &face_t);
+ s = face_s; /* vec */
+ t = face_t; /* vec */
+ /* use 'r' to indicate cube face */
+ r = lp_build_broadcast_scalar(&bld->int_coord_bld, face); /* vec */
+
+ /* recompute ddx, ddy using the new (s,t) face texcoords */
+ face_ddx[0] = lp_build_ddx(&bld->coord_bld, s);
+ face_ddx[1] = lp_build_ddx(&bld->coord_bld, t);
+ face_ddx[2] = NULL;
+ face_ddx[3] = NULL;
+ face_ddy[0] = lp_build_ddy(&bld->coord_bld, s);
+ face_ddy[1] = lp_build_ddy(&bld->coord_bld, t);
+ face_ddy[2] = NULL;
+ face_ddy[3] = NULL;
+ ddx = face_ddx;
+ ddy = face_ddy;
+ }
+
/*
* Compute the level of detail (float).
*/
/* Need to compute lod either to choose mipmap levels or to
* distinguish between minification/magnification with one mipmap level.
*/
- lod = lp_build_lod_selector(bld, s, t, r, ddx, ddy,
+ lod = lp_build_lod_selector(bld, ddx, ddy,
lod_bias, explicit_lod,
width, height, depth);
}
*/
if (mip_filter == PIPE_TEX_MIPFILTER_NONE) {
/* always use mip level 0 */
- ilevel0 = LLVMConstInt(LLVMInt32Type(), 0, 0);
+ if (bld->static_state->target == PIPE_TEXTURE_CUBE) {
+ /* XXX this is a work-around for an apparent bug in LLVM 2.7.
+ * We should be able to set ilevel0 = const(0) but that causes
+ * bad x86 code to be emitted.
+ */
+ lod = lp_build_const_elem(bld->coord_bld.type, 0.0);
+ lp_build_nearest_mip_level(bld, unit, lod, &ilevel0);
+ }
+ else {
+ ilevel0 = LLVMConstInt(LLVMInt32Type(), 0, 0);
+ }
}
else {
+ assert(lod);
if (mip_filter == PIPE_TEX_MIPFILTER_NEAREST) {
lp_build_nearest_mip_level(bld, unit, lod, &ilevel0);
}
}
}
- /*
- * Choose cube face, recompute per-face texcoords.
- */
- if (bld->static_state->target == PIPE_TEXTURE_CUBE) {
- LLVMValueRef face, face_s, face_t;
- lp_build_cube_lookup(bld, s, t, r, &face, &face_s, &face_t);
- s = face_s; /* vec */
- t = face_t; /* vec */
- /* use 'r' to indicate cube face */
- r = lp_build_broadcast_scalar(&bld->int_coord_bld, face); /* vec */
- }
-
/*
* Get pointer(s) to image data for mipmap level(s).
*/
* 'texel' will return a vector of four LLVMValueRefs corresponding to
* R, G, B, A.
* \param type vector float type to use for coords, etc.
+ * \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
*/
void
lp_build_sample_soa(LLVMBuilderRef builder,
unsigned unit,
unsigned num_coords,
const LLVMValueRef *coords,
- const LLVMValueRef *ddx,
- const LLVMValueRef *ddy,
+ const LLVMValueRef ddx[4],
+ const LLVMValueRef ddy[4],
LLVMValueRef lod_bias, /* optional */
LLVMValueRef explicit_lod, /* optional */
LLVMValueRef texel_out[4])
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