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Bake API: calculating differentials

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Code with contribution from Brecht Van Lommel (he wrote the
bake_differentials actually ;)

Reviewers: brecht

Differential Revision: https://developer.blender.org/D510
This commit is contained in:
Dalai Felinto
2014-05-07 19:23:38 -03:00
parent 732bc8fcae
commit 31cb7e395e
1 changed files with 31 additions and 5 deletions
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36
source/blender/render/intern/source/bake_api.c
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@@ -95,6 +95,8 @@ typedef struct BakeDataZSpan {
int primitive_id;
BakeImage *bk_image;
ZSpan *zspan;
float du_dx, du_dy;
float dv_dx, dv_dy;
} BakeDataZSpan;
/**
@@ -126,11 +128,10 @@ static void store_bake_pixel(void *handle, int x, int y, float u, float v)
copy_v2_fl2(pixel->uv, u, v);
pixel->du_dx =
pixel->du_dy =
pixel->dv_dx =
pixel->dv_dy =
0.0f;
pixel->du_dx = bd->du_dx;
pixel->du_dy = bd->du_dy;
pixel->dv_dx = bd->dv_dx;
pixel->dv_dy = bd->dv_dy;
}
void RE_bake_mask_fill(const BakePixel pixel_array[], const int num_pixels, char *mask)
@@ -441,6 +442,28 @@ cleanup:
MEM_freeN(dm_highpoly);
}
static void bake_differentials(BakeDataZSpan *bd, const float *uv1, const float *uv2, const float *uv3)
{
float A;
/* assumes dPdu = P1 - P3 and dPdv = P2 - P3 */
A = (uv2[0] - uv1[0]) * (uv3[1] - uv1[1]) - (uv3[0] - uv1[0]) * (uv2[1] - uv1[1]);
if (fabsf(A) > FLT_EPSILON) {
A = 0.5f / A;
bd->du_dx = (uv2[1] - uv3[1]) * A;
bd->dv_dx = (uv3[1] - uv1[1]) * A;
bd->du_dy = (uv3[0] - uv2[0]) * A;
bd->dv_dy = (uv1[0] - uv3[0]) * A;
}
else {
bd->du_dx = bd->dv_dx = 0.0f;
bd->dv_dx = bd->dv_dy = 0.0f;
}
}
void RE_bake_pixels_populate(
Mesh *me, BakePixel pixel_array[],
const int num_pixels, const BakeImages *bake_images)
@@ -494,11 +517,14 @@ void RE_bake_pixels_populate(
vec[a][1] = mtf->uv[a][1] * (float)bd.bk_image->height - (0.5f + 0.002f);
}
bake_differentials(&bd, vec[0], vec[1], vec[2]);
zspan_scanconvert(&bd.zspan[image_id], (void *)&bd, vec[0], vec[1], vec[2], store_bake_pixel);
/* 4 vertices in the face */
if (mf->v4 != 0) {
bd.primitive_id = ++p_id;
bake_differentials(&bd, vec[0], vec[2], vec[3]);
zspan_scanconvert(&bd.zspan[image_id], (void *)&bd, vec[0], vec[2], vec[3], store_bake_pixel);
}
}