static INLINE float
frac(float f)
{
- return f - util_ifloor(f);
+ return f - floorf(f);
}
const float max = 1.0F - min;
for (ch = 0; ch < 4; ch++) {
const int flr = util_ifloor(s[ch]);
- float u;
+ float u = frac(s[ch]);
if (flr & 1)
- u = 1.0F - (s[ch] - (float) flr);
- else
- u = s[ch] - (float) flr;
+ u = 1.0F - u;
if (u < min)
icoord[ch] = 0;
else if (u > max)
uint ch;
for (ch = 0; ch < 4; ch++) {
const int flr = util_ifloor(s[ch]);
- float u;
+ float u = frac(s[ch]);
if (flr & 1)
- u = 1.0F - (s[ch] - (float) flr);
- else
- u = s[ch] - (float) flr;
+ u = 1.0F - u;
u = u * size - 0.5F;
icoord0[ch] = util_ifloor(u);
icoord1[ch] = icoord0[ch] + 1;
/**
- * For RECT textures / unnormalized texcoords
- * Only a subset of wrap modes supported.
+ * PIPE_TEX_WRAP_CLAMP for nearest sampling, unnormalized coords.
*/
static void
wrap_nearest_unorm_clamp(const float s[4], unsigned size, int icoord[4])
/**
- * Handles clamp_to_edge and clamp_to_border:
+ * PIPE_TEX_WRAP_CLAMP_TO_BORDER for nearest sampling, unnormalized coords.
*/
static void
wrap_nearest_unorm_clamp_to_border(const float s[4], unsigned size,
int icoord[4])
+{
+ uint ch;
+ for (ch = 0; ch < 4; ch++) {
+ icoord[ch]= util_ifloor( CLAMP(s[ch], -0.5F, (float) size + 0.5F) );
+ }
+}
+
+
+/**
+ * PIPE_TEX_WRAP_CLAMP_TO_EDGE for nearest sampling, unnormalized coords.
+ */
+static void
+wrap_nearest_unorm_clamp_to_edge(const float s[4], unsigned size,
+ int icoord[4])
{
uint ch;
for (ch = 0; ch < 4; ch++) {
/**
- * For RECT textures / unnormalized texcoords.
- * Only a subset of wrap modes supported.
+ * PIPE_TEX_WRAP_CLAMP for linear sampling, unnormalized coords.
*/
static void
wrap_linear_unorm_clamp(const float s[4], unsigned size,
}
+/**
+ * PIPE_TEX_WRAP_CLAMP_TO_BORDER for linear sampling, unnormalized coords.
+ */
static void
wrap_linear_unorm_clamp_to_border(const float s[4], unsigned size,
int icoord0[4], int icoord1[4], float w[4])
{
uint ch;
for (ch = 0; ch < 4; ch++) {
- float u = CLAMP(s[ch], 0.5F, (float) size - 0.5F);
+ float u = CLAMP(s[ch], -0.5F, (float) size + 0.5F);
+ u -= 0.5F;
+ icoord0[ch] = util_ifloor(u);
+ icoord1[ch] = icoord0[ch] + 1;
+ if (icoord1[ch] > (int) size - 1)
+ icoord1[ch] = size - 1;
+ w[ch] = frac(u);
+ }
+}
+
+
+/**
+ * PIPE_TEX_WRAP_CLAMP_TO_EDGE for linear sampling, unnormalized coords.
+ */
+static void
+wrap_linear_unorm_clamp_to_edge(const float s[4], unsigned size,
+ int icoord0[4], int icoord1[4], float w[4])
+{
+ uint ch;
+ for (ch = 0; ch < 4; ch++) {
+ float u = CLAMP(s[ch], +0.5F, (float) size - 0.5F);
u -= 0.5F;
icoord0[ch] = util_ifloor(u);
icoord1[ch] = icoord0[ch] + 1;
const float p[QUAD_SIZE])
{
const struct pipe_texture *texture = samp->texture;
- const struct pipe_sampler_state *sampler = samp->sampler;
float dsdx = fabsf(s[QUAD_BOTTOM_RIGHT] - s[QUAD_BOTTOM_LEFT]);
float dsdy = fabsf(s[QUAD_TOP_LEFT] - s[QUAD_BOTTOM_LEFT]);
float rho = MAX2(dsdx, dsdy) * texture->width0;
const float p[QUAD_SIZE])
{
const struct pipe_texture *texture = samp->texture;
- const struct pipe_sampler_state *sampler = samp->sampler;
float dsdx = fabsf(s[QUAD_BOTTOM_RIGHT] - s[QUAD_BOTTOM_LEFT]);
float dsdy = fabsf(s[QUAD_TOP_LEFT] - s[QUAD_BOTTOM_LEFT]);
float dtdx = fabsf(t[QUAD_BOTTOM_RIGHT] - t[QUAD_BOTTOM_LEFT]);
const float p[QUAD_SIZE])
{
const struct pipe_texture *texture = samp->texture;
- const struct pipe_sampler_state *sampler = samp->sampler;
float dsdx = fabsf(s[QUAD_BOTTOM_RIGHT] - s[QUAD_BOTTOM_LEFT]);
float dsdy = fabsf(s[QUAD_TOP_LEFT] - s[QUAD_BOTTOM_LEFT]);
float dtdx = fabsf(t[QUAD_BOTTOM_RIGHT] - t[QUAD_BOTTOM_LEFT]);
}
+/**
+ * Compute nearest mipmap level from texcoords.
+ * Then sample the texture level for four elements of a quad.
+ * \param c0 the LOD bias factors, or absolute LODs (depending on control)
+ */
static void
mip_filter_nearest(struct tgsi_sampler *tgsi_sampler,
const float s[QUAD_SIZE],
/**
- * Compute which cube face is referenced by each texcoord and put that
- * info into the sampler faces[] array. Then sample the cube faces
+ * Use 3D texcoords to choose a cube face, then sample the 2D cube faces.
+ * Put face info into the sampler faces[] array.
*/
static void
sample_cube(struct tgsi_sampler *tgsi_sampler,
/*
major axis
- direction target sc tc ma
- ---------- ------------------------------- --- --- ---
+ direction target sc tc ma
+ ---------- ------------------------------- --- --- ---
+rx TEXTURE_CUBE_MAP_POSITIVE_X_EXT -rz -ry rx
-rx TEXTURE_CUBE_MAP_NEGATIVE_X_EXT +rz -ry rx
+ry TEXTURE_CUBE_MAP_POSITIVE_Y_EXT +rx +rz ry
+rz TEXTURE_CUBE_MAP_POSITIVE_Z_EXT +rx -ry rz
-rz TEXTURE_CUBE_MAP_NEGATIVE_Z_EXT -rx -ry rz
*/
- for (j = 0; j < QUAD_SIZE; j++) {
- float rx = s[j];
- float ry = t[j];
- float rz = p[j];
+
+ /* Choose the cube face and compute new s/t coords for the 2D face.
+ *
+ * Use the same cube face for all four pixels in the quad.
+ *
+ * This isn't ideal, but if we want to use a different cube face
+ * per pixel in the quad, we'd have to also compute the per-face
+ * LOD here too. That's because the four post-face-selection
+ * texcoords are no longer related to each other (they're
+ * per-face!) so we can't use subtraction to compute the partial
+ * deriviates to compute the LOD. Doing so (near cube edges
+ * anyway) gives us pretty much random values.
+ */
+ {
+ /* use the average of the four pixel's texcoords to choose the face */
+ const float rx = 0.25 * (s[0] + s[1] + s[2] + s[3]);
+ const float ry = 0.25 * (t[0] + t[1] + t[2] + t[3]);
+ const float rz = 0.25 * (p[0] + p[1] + p[2] + p[3]);
const float arx = fabsf(rx), ary = fabsf(ry), arz = fabsf(rz);
- unsigned face;
- float sc, tc, ma;
if (arx >= ary && arx >= arz) {
- if (rx >= 0.0F) {
- face = PIPE_TEX_FACE_POS_X;
- sc = -rz;
- tc = -ry;
- ma = arx;
- }
- else {
- face = PIPE_TEX_FACE_NEG_X;
- sc = rz;
- tc = -ry;
- ma = arx;
+ float sign = (rx >= 0.0F) ? 1.0F : -1.0F;
+ uint face = (rx >= 0.0F) ? PIPE_TEX_FACE_POS_X : PIPE_TEX_FACE_NEG_X;
+ for (j = 0; j < QUAD_SIZE; j++) {
+ const float ima = -0.5F / fabsf(s[j]);
+ ssss[j] = sign * p[j] * ima + 0.5F;
+ tttt[j] = t[j] * ima + 0.5F;
+ samp->faces[j] = face;
}
}
else if (ary >= arx && ary >= arz) {
- if (ry >= 0.0F) {
- face = PIPE_TEX_FACE_POS_Y;
- sc = rx;
- tc = rz;
- ma = ary;
- }
- else {
- face = PIPE_TEX_FACE_NEG_Y;
- sc = rx;
- tc = -rz;
- ma = ary;
+ float sign = (ry >= 0.0F) ? 1.0F : -1.0F;
+ uint face = (ry >= 0.0F) ? PIPE_TEX_FACE_POS_Y : PIPE_TEX_FACE_NEG_Y;
+ for (j = 0; j < QUAD_SIZE; j++) {
+ const float ima = -0.5F / fabsf(t[j]);
+ ssss[j] = -s[j] * ima + 0.5F;
+ tttt[j] = sign * -p[j] * ima + 0.5F;
+ samp->faces[j] = face;
}
}
else {
- if (rz > 0.0F) {
- face = PIPE_TEX_FACE_POS_Z;
- sc = rx;
- tc = -ry;
- ma = arz;
- }
- else {
- face = PIPE_TEX_FACE_NEG_Z;
- sc = -rx;
- tc = -ry;
- ma = arz;
+ float sign = (rz >= 0.0F) ? 1.0F : -1.0F;
+ uint face = (rz >= 0.0F) ? PIPE_TEX_FACE_POS_Z : PIPE_TEX_FACE_NEG_Z;
+ for (j = 0; j < QUAD_SIZE; j++) {
+ const float ima = -0.5 / fabsf(p[j]);
+ ssss[j] = sign * -s[j] * ima + 0.5F;
+ tttt[j] = t[j] * ima + 0.5F;
+ samp->faces[j] = face;
}
}
-
- {
- const float ima = 1.0 / ma;
- ssss[j] = ( sc * ima + 1.0F ) * 0.5F;
- tttt[j] = ( tc * ima + 1.0F ) * 0.5F;
- samp->faces[j] = face;
- }
}
/* In our little pipeline, the compare stage is next. If compare
case PIPE_TEX_WRAP_CLAMP:
return wrap_nearest_unorm_clamp;
case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
+ return wrap_nearest_unorm_clamp_to_edge;
case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
return wrap_nearest_unorm_clamp_to_border;
default:
case PIPE_TEX_WRAP_CLAMP:
return wrap_linear_unorm_clamp;
case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
+ return wrap_linear_unorm_clamp_to_edge;
case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
return wrap_linear_unorm_clamp_to_border;
default:
projects / mesa.git / blobdiff