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cell: trilinear mipmap interpolation

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This commit is contained in:
Brian Paul
2008-10-16 11:19:22 -06:00
parent f0c70f9aab
commit 5191429b15
1 changed files with 46 additions and 9 deletions
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src/gallium/drivers/cell/spu/spu_texture.c
+46 -9
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@@ -415,7 +415,7 @@ sample_texture_2d_bilinear_int(vector float s, vector float t,
* Compute level of detail factor from texcoords.
*/
static float
compute_lambda(uint unit, vector float s, vector float t)
compute_lambda_2d(uint unit, vector float s, vector float t)
{
uint baseLevel = 0;
float width = spu.texture[unit].level[baseLevel].width;
@@ -433,9 +433,27 @@ compute_lambda(uint unit, vector float s, vector float t)
}
/**
* Blend two sets of colors according to weight.
*/
static void
blend_colors(vector float c0[4], const vector float c1[4], float weight)
{
vector float t = spu_splats(weight);
vector float dc0 = spu_sub(c1[0], c0[0]);
vector float dc1 = spu_sub(c1[1], c0[1]);
vector float dc2 = spu_sub(c1[2], c0[2]);
vector float dc3 = spu_sub(c1[3], c0[3]);
c0[0] = spu_madd(dc0, t, c0[0]);
c0[1] = spu_madd(dc1, t, c0[1]);
c0[2] = spu_madd(dc2, t, c0[2]);
c0[3] = spu_madd(dc3, t, c0[3]);
}
/**
* Texture sampling with level of detail selection.
* Texture sampling with level of detail selection and possibly mipmap
* interpolation.
*/
void
sample_texture_2d_lod(vector float s, vector float t,
@@ -446,7 +464,7 @@ sample_texture_2d_lod(vector float s, vector float t,
* Note that we're computing a lambda/lod here that's used for all
* four pixels in the quad.
*/
float lambda = compute_lambda(unit, s, t);
float lambda = compute_lambda_2d(unit, s, t);
(void) face;
(void) level_ignored;
@@ -462,15 +480,34 @@ sample_texture_2d_lod(vector float s, vector float t,
if (lambda <= 0.0f) {
/* magnify */
spu.mag_sample_texture_2d[unit](s, t, unit, 0, 0, colors);
spu.mag_sample_texture_2d[unit](s, t, unit, 0, face, colors);
}
else {
/* minify */
int level = (int) (lambda + 0.5f);
if (level > (int) spu.texture[unit].max_level)
level = spu.texture[unit].max_level;
spu.min_sample_texture_2d[unit](s, t, unit, level, 0, colors);
/* XXX to do: mipmap level interpolation */
if (spu.sampler[unit].min_img_filter == PIPE_TEX_FILTER_LINEAR) {
/* sample two mipmap levels and interpolate */
int level = (int) lambda;
if (level > (int) spu.texture[unit].max_level)
level = spu.texture[unit].max_level;
spu.min_sample_texture_2d[unit](s, t, unit, level, face, colors);
if (spu.sampler[unit].min_img_filter == PIPE_TEX_FILTER_LINEAR) {
/* sample second mipmap level */
float weight = lambda - (float) level;
level++;
if (level <= (int) spu.texture[unit].max_level) {
vector float colors2[4];
spu.min_sample_texture_2d[unit](s, t, unit, level, face, colors2);
blend_colors(colors, colors2, weight);
}
}
}
else {
/* sample one mipmap level */
int level = (int) (lambda + 0.5f);
if (level > (int) spu.texture[unit].max_level)
level = spu.texture[unit].max_level;
spu.min_sample_texture_2d[unit](s, t, unit, level, face, colors);
}
}
}