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texture sampling optimization

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This commit is contained in:
Bigfoot71 2025-03-13 22:54:05 +01:00
parent 9be90fd5e6
commit d3fe48fa7d
1 changed files with 18 additions and 18 deletions
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38
src/external/rlsw.h vendored
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@ -922,26 +922,25 @@ static inline void sw_texture_sample(float* color, const sw_texture_t* tex, floa
// at the wrong moment during rasterization. It would be worth reviewing
// this, although the scanline method complicates things.
// Calculate the derivatives for each axis
float du = sqrtf(xDu * xDu + yDu * yDu);
float dv = sqrtf(xDv * xDv + yDv * yDv);
float L = (du > dv) ? du : dv;
// Previous method: There is no need to compute the square root
// because using the squared value, the comparison remains `L2 > 1.0f * 1.0f`
//float du = sqrtf(xDu * xDu + yDu * yDu);
//float dv = sqrtf(xDv * xDv + yDv * yDv);
//float L = (du > dv) ? du : dv;
// Select the filter based on the size of the footprint
if (L > 1.0f) {
// Minification
if (tex->minFilter == SW_NEAREST) {
sw_texture_sample_nearest(color, tex, u, v);
} else if (tex->minFilter == SW_LINEAR) {
sw_texture_sample_linear(color, tex, u, v);
}
} else {
// Magnification
if (tex->magFilter == SW_NEAREST) {
sw_texture_sample_nearest(color, tex, u, v);
} else if (tex->magFilter == SW_LINEAR) {
sw_texture_sample_linear(color, tex, u, v);
}
// Calculate the derivatives for each axis
float du2 = xDu * xDu + yDu * yDu;
float dv2 = xDv * xDv + yDv * yDv;
float L2 = (du2 > dv2) ? du2 : dv2;
bool useMinFilter = (L2 > 1.0f);
int filter = useMinFilter ? tex->minFilter : tex->magFilter;
if (filter == SW_NEAREST) {
sw_texture_sample_nearest(color, tex, u, v);
}
else /* SW_LINEAR */ {
sw_texture_sample_linear(color, tex, u, v);
}
}
@ -1949,6 +1948,7 @@ void swInit(int w, int h)
RLSW.currentMatrixMode = SW_MODELVIEW;
RLSW.currentMatrix = &RLSW.matView;
RLSW.needToUpdateMVP = true;
sw_matrix_id(RLSW.matProjection);
sw_matrix_id(RLSW.matTexture);