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// Copyright 2009 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
#include "Texture2D.ih"
#include "Texture2DUtil.ih"
OSPRAY_BEGIN_ISPC_NAMESPACE
// TODO tiling
// Texture coordinate utilities
//////////////////////////////////////////////////////////////////////////////
inline float wrap_coord(
const uniform uint32 wrapMode, const float halfTexel, const float p)
{
float tc = 0.f;
switch (wrapMode) {
case OSP_TEXTURE_WRAP_REPEAT:
tc = frac(p - halfTexel) + halfTexel;
tc = max(tc, 0.f); // filter out inf/NaN
break;
case OSP_TEXTURE_WRAP_MIRRORED_REPEAT: {
tc = 2.f * frac(p * 0.5f);
if (tc >= 1.f)
tc = 2.f - tc;
tc = clamp(tc, halfTexel, 1.f - halfTexel);
break;
}
case OSP_TEXTURE_WRAP_CLAMP_TO_EDGE:
tc = clamp(p, halfTexel, 1.f - halfTexel);
}
return tc;
}
inline vec2i nearest_coords(
const vec2f p, const uniform vec2ui wrapMode, const vec2i size)
{
vec2f tc;
tc.x = wrap_coord(wrapMode.x, 0.f, p.x);
tc.y = wrap_coord(wrapMode.y, 0.f, p.y);
// scale by texture size and clamp
const vec2i tci = min(make_vec2i(tc * make_vec2f(size.x, size.y)), size - 1);
return tci;
}
struct BilinCoords
{
vec2i st0;
vec2i st1;
vec2f frac;
};
inline BilinCoords bilinear_coords(
const vec2f p, const uniform vec2ui wrapMode, const vec2i size)
{
BilinCoords coords;
vec2f tc;
const vec2f sizef = make_vec2f(size.x, size.y);
const vec2f halfTexel = rcp(sizef) * 0.5f;
tc.x = wrap_coord(wrapMode.x, halfTexel.x, p.x);
tc.y = wrap_coord(wrapMode.y, halfTexel.y, p.y);
tc = tc - halfTexel; // lower sample shifted by half a texel
tc = tc * sizef;
coords.frac = frac(tc);
coords.st0 = min(make_vec2i(tc), size - 1);
coords.st1 = coords.st0 + 1;
// handle border cases as REPEAT
if (coords.st1.x >= size.x)
coords.st1.x = 0;
if (coords.st1.y >= size.y)
coords.st1.y = 0;
return coords;
}
inline vec4f bilerp(const vec2f frac,
const vec4f c00,
const vec4f c01,
const vec4f c10,
const vec4f c11)
{
return lerp(frac.y, lerp(frac.x, c00, c01), lerp(frac.x, c10, c11));
}
inline vec2i sizeAtLevel(const vec2i size, const int level)
{
return make_vec2i(max(size.x >> level, 1), max(size.y >> level, 1));
}
#define __define_tex_get(FMT) \
\
static vec4f Texture2D_nearest_l_##FMT(const Texture2D *uniform self, \
const DifferentialGeometry &dg, \
const int level) \
{ \
const vec2i size = sizeAtLevel(self->size, level); \
const vec2i i = nearest_coords(dg.st, self->wrapMode, size); \
const uint32 idx = i.y * size.x + i.x; \
return getTexel_##FMT(self->data[level], idx); \
} \
\
static vec4f Texture2D_bilinear_l_##FMT(const Texture2D *uniform self, \
const DifferentialGeometry &dg, \
const int level) \
{ \
const vec2i size = sizeAtLevel(self->size, level); \
const BilinCoords cs = bilinear_coords(dg.st, self->wrapMode, size); \
const void *data = self->data[level]; \
\
const vec4f c00 = getTexel_##FMT(data, cs.st0.y * size.x + cs.st0.x); \
const vec4f c01 = getTexel_##FMT(data, cs.st0.y * size.x + cs.st1.x); \
const vec4f c10 = getTexel_##FMT(data, cs.st1.y * size.x + cs.st0.x); \
const vec4f c11 = getTexel_##FMT(data, cs.st1.y * size.x + cs.st1.x); \
\
return bilerp(cs.frac, c00, c01, c10, c11); \
} \
\
static vec4f Texture2D_##FMT(const Texture2D *uniform self, \
const DifferentialGeometry &dg, \
const int level, \
const float frac, \
const bool filter_nearest) \
{ \
vec4f t0 = filter_nearest ? Texture2D_nearest_l_##FMT(self, dg, level) \
: Texture2D_bilinear_l_##FMT(self, dg, level); \
if (frac == 0.f) \
return t0; \
\
vec4f t1 = filter_nearest \
? Texture2D_nearest_l_##FMT(self, dg, level + 1) \
: Texture2D_bilinear_l_##FMT(self, dg, level + 1); \
return lerp(frac, t0, t1); \
} \
struct swallow_semicolon
__foreach_fetcher(__define_tex_get);
#define __define_tex_getN(FMT, C) \
static vec3f Texture2D_N_##FMT(const Texture2D *uniform self, \
const DifferentialGeometry &dg, \
const int level, \
const float frac, \
const bool filter_nearest) \
{ \
return make_vec3f(Texture2D_##FMT(self, dg, level, frac, filter_nearest)) \
* C \
- 1.f; \
} \
struct swallow_semicolon
#define __define_tex_case(NAME, FMT) \
case OSP_TEXTURE_##FMT: \
return (void *uniform) & NAME##_##FMT
#define __define_tex_call_tex_case(FMT) __define_call_tex_case(Texture2D, FMT)
#define __define_tex_callN_tex_case(FMT) \
__define_call_tex_case(Texture2D_N, FMT)
#define __define_tex_get_case(FMT) __define_tex_case(Texture2D, FMT)
#define __define_tex_getN_case(FMT) __define_tex_case(Texture2D_N, FMT)
#define __define_call_tex_case(NAME, FMT) \
case OSP_TEXTURE_##FMT: \
return NAME##_##FMT(self, dg, mipLevel, frac, filter_nearest)
export void *uniform Texture2D_get_addr(const uniform uint32 type)
{
switch (type) {
__foreach_fetcher(__define_tex_get_case);
default:
break;
}
return NULL;
};
inline float calcLambda(const float pixelFootprint,
const vec2i size,
const uniform bool filter_nearest)
{
float t0 = pixelFootprint * max(size.x, size.y);
if (!filter_nearest)
t0 *= 0.5f; // bilinear filtering increases filter width by 2: compensate
return log(t0) / log(2.f);
}
SYCL_EXTERNAL vec4f Texture2D_get(
const Texture *uniform _self, const DifferentialGeometry &dg)
{
const Texture2D *uniform self = (const Texture2D *uniform)_self;
int mipLevel = 0;
float frac = 0.f;
const uniform bool filter_nearest = self->filter & OSP_TEXTURE_FILTER_NEAREST;
if (self->maxLevel) {
const float lambda =
max(0.f, calcLambda(dg.pixelFootprint, self->size, filter_nearest));
mipLevel = min((int)lambda, self->maxLevel - 1);
frac = min(lambda - mipLevel, 1.f);
}
switch (self->format) {
__foreach_fetcher(__define_tex_call_tex_case);
default:
break;
}
return make_vec4f(0.f, 0.f, 0.f, 1.f);
}
static vec3f Texture2D_Normal_neutral(
const Texture2D *uniform, const DifferentialGeometry &)
{
return make_vec3f(0.f, 0.f, 1.f);
}
__define_tex_getN(RGB8, (255.f / 127.f));
__define_tex_getN(RGBA8, (255.f / 127.f));
__define_tex_getN(RGB32F, 2.f);
__define_tex_getN(RGBA32F, 2.f);
__define_tex_getN(RGB16F, 2.f);
__define_tex_getN(RGBA16F, 2.f);
__define_tex_getN(RGB16, (65535.f / 32767.f));
__define_tex_getN(RGBA16, (65535.f / 32767.f));
export void *uniform Texture2D_getN_addr(const uniform uint32 type)
{
switch (type) {
case OSP_TEXTURE_SRGBA: /* fallthrough, sRGB ignored for normals */
__define_tex_getN_case(RGBA8);
case OSP_TEXTURE_SRGB: /* fallthrough, sRGB ignored for normals */
__define_tex_getN_case(RGB8);
__define_tex_getN_case(RGBA32F);
__define_tex_getN_case(RGB32F);
__define_tex_getN_case(RGBA16F);
__define_tex_getN_case(RGB16F);
__define_tex_getN_case(RGBA16);
__define_tex_getN_case(RGB16);
default:
break;
}
return (void *uniform) & Texture2D_Normal_neutral;
};
SYCL_EXTERNAL vec3f Texture2D_getNormal(
const Texture *uniform _self, const DifferentialGeometry &dg)
{
const Texture2D *uniform self = (const Texture2D *uniform)_self;
int mipLevel = 0;
float frac = 0.f;
const uniform bool filter_nearest = self->filter & OSP_TEXTURE_FILTER_NEAREST;
if (self->maxLevel) {
const float lambda =
max(0.f, calcLambda(dg.pixelFootprint, self->size, filter_nearest));
mipLevel = min((int)lambda, self->maxLevel - 1);
frac = min(lambda - mipLevel, 1.f);
}
switch (self->format) {
case OSP_TEXTURE_SRGBA: /* fallthrough, sRGB ignored for normals */
__define_tex_callN_tex_case(RGBA8);
case OSP_TEXTURE_SRGB: /* fallthrough, sRGB ignored for normals */
__define_tex_callN_tex_case(RGB8);
__define_tex_callN_tex_case(RGBA32F);
__define_tex_callN_tex_case(RGB32F);
__define_tex_callN_tex_case(RGBA16F);
__define_tex_callN_tex_case(RGB16F);
__define_tex_callN_tex_case(RGBA16);
__define_tex_callN_tex_case(RGB16);
default:
break;
}
return Texture2D_Normal_neutral(self, dg);
}
// Poor mans unit tests
//////////////////////////////////////////////////////////////////////////////
#ifdef OSPRAY_UNITTEST
uniform size_t channels(OSPTextureFormat format)
{
switch (format) {
case OSP_TEXTURE_RGBA8:
case OSP_TEXTURE_SRGBA:
case OSP_TEXTURE_RGBA32F:
case OSP_TEXTURE_RGBA16:
case OSP_TEXTURE_RGBA16F:
return 4;
case OSP_TEXTURE_RGB8:
case OSP_TEXTURE_SRGB:
case OSP_TEXTURE_RGB32F:
case OSP_TEXTURE_RGB16:
case OSP_TEXTURE_RGB16F:
return 3;
case OSP_TEXTURE_RA32F:
case OSP_TEXTURE_RA8:
case OSP_TEXTURE_LA8:
case OSP_TEXTURE_RA16:
case OSP_TEXTURE_RA16F:
return 2;
case OSP_TEXTURE_R8:
case OSP_TEXTURE_L8:
case OSP_TEXTURE_R32F:
case OSP_TEXTURE_R16:
case OSP_TEXTURE_R16F:
return 1;
default:
return 0;
}
}
uniform bool hdr(OSPTextureFormat format)
{
switch (format) {
case OSP_TEXTURE_RGBA32F:
case OSP_TEXTURE_RGBA16F:
case OSP_TEXTURE_RGB32F:
case OSP_TEXTURE_RGB16F:
case OSP_TEXTURE_RA32F:
case OSP_TEXTURE_RA16F:
case OSP_TEXTURE_R32F:
case OSP_TEXTURE_R16F:
return true;
default:
return false;
}
}
#define define_texAccessor_consistency(FMT) \
{ \
setTexel_##FMT(&data, programIndex, testIn); \
const vec4f testOut = getTexel_##FMT(&data, programIndex); \
const uniform int ch = channels(OSP_TEXTURE_##FMT); \
const uniform bool alpha = ch == 2 || ch == 4; \
const uniform bool hd = hdr(OSP_TEXTURE_##FMT); \
const uniform bool lm = OSP_TEXTURE_##FMT == OSP_TEXTURE_LA8 \
|| OSP_TEXTURE_##FMT == OSP_TEXTURE_L8; \
if (ch == 0) \
print("Invalid format " #FMT "\n"); \
if (abs(testIn.x - testOut.x) > 1e-2f && (hd || testOut.x != 1.0f)) { \
print("Failed ch 1 and format " #FMT " % %\n", testIn.x, testOut.x); \
success = false; \
} \
if (abs(testIn.y - testOut.y) > 1e-2f && (hd || testOut.y != 1.0f) \
&& (ch > 2 || testOut.y != 0.0f) && (!lm || testOut.y != testOut.x)) { \
print("Failed ch 2 and format " #FMT " % %\n", testIn.y, testOut.y); \
success = false; \
} \
if (abs(testIn.z - testOut.z) > 1e-2f && (hd || testOut.z != 1.0f) \
&& (ch > 2 || testOut.z != 0.0f) && (!lm || testOut.z != testOut.x)) { \
print("Failed ch 3 and format " #FMT " % %\n", testIn.z, testOut.z); \
success = false; \
} \
if (abs(testIn.w - testOut.w) > 1e-2f \
&& (hd && alpha || testOut.w != 1.0f)) { \
print("Failed ch 4 and format " #FMT " % %\n", testIn.w, testOut.w); \
success = false; \
} \
} \
struct swallow_semicolon
bool checkTexAcc(const vec4f testIn)
{
bool success = true;
vec4f data; // largest format
__foreach_fetcher(define_texAccessor_consistency);
return success;
}
export uniform bool checkTextureAccessorConsistency()
{
bool success = true;
success &= checkTexAcc(make_vec4f(programIndex * 0.15f));
success &= checkTexAcc(make_vec4f(0.4f + programIndex * 0.027f));
success &= checkTexAcc(make_vec4f(0.01f, 0.91f, 0.37f, 0.5f));
return all(success);
}
#endif
OSPRAY_END_ISPC_NAMESPACE
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