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affine interpolation per blocks

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This commit is contained in:
Bigfoot71 2026-03-18 17:42:53 +01:00
parent 23efe6decf
commit a31fecf0b9
1 changed files with 113 additions and 66 deletions
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113
src/external/rlsw.h vendored
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@ -5259,16 +5259,11 @@ void swGetFramebufferAttachmentParameteriv(SWattachment attachment, SWattachget
static void SW_RASTER_TRIANGLE_SPAN(const sw_vertex_t *start, const sw_vertex_t *end, float dUdy, float dVdy)
{
// Gets the start and end coordinates
// Gets the start/end coordinates and skip empty lines
int xStart = (int)start->coord[0];
int xEnd = (int)end->coord[0];
// Avoid empty lines
if (xStart == xEnd) return;
// Compute the subpixel distance to traverse before the first pixel
float xSubstep = 1.0f - sw_fract(start->coord[0]);
// Compute the inverse horizontal distance along the X axis
float dxRcp = 1.0f/(end->coord[0] - start->coord[0]);
@ -5288,6 +5283,9 @@ static void SW_RASTER_TRIANGLE_SPAN(const sw_vertex_t *start, const sw_vertex_t
float dVdx = (end->texcoord[1] - start->texcoord[1])*dxRcp;
#endif
// Compute the subpixel distance to traverse before the first pixel
float xSubstep = 1.0f - sw_fract(start->coord[0]);
// Initializing the interpolation starting values
float w = start->coord[3] + dWdx*xSubstep;
float color[4] = {
@ -5312,24 +5310,51 @@ static void SW_RASTER_TRIANGLE_SPAN(const sw_vertex_t *start, const sw_vertex_t
uint8_t *dPtr = (uint8_t *)(RLSW.depthBuffer->pixels) + baseOffset*SW_FRAMEBUFFER_DEPTH_SIZE;
#endif
// Scanline rasterization
for (int x = xStart; x < xEnd; x++)
#define SW_AFFINE_BLOCK 16
int x = xStart;
while (x < xEnd)
{
float wRcp = 1.0f/w;
// Clamp last block to remaining pixels
int blockEnd = x + SW_AFFINE_BLOCK;
if (blockEnd > xEnd) blockEnd = xEnd;
float blockLenF = (float)(blockEnd - x);
float blockLenRcp = 1.0f / blockLenF;
// Only 2 '1/w' here; none inside the pixel loop
float wRcpA = 1.0f / w;
float wB = w + dWdx*blockLenF;
float wRcpB = 1.0f / wB;
// Perspective-correct color at both block endpoints, then affine gradient
float srcColor[4] = {
color[0]*wRcp,
color[1]*wRcp,
color[2]*wRcp,
color[3]*wRcp
color[0]*wRcpA,
color[1]*wRcpA,
color[2]*wRcpA,
color[3]*wRcpA
};
float dSrcColordx[4] = {
((color[0] + dCdx[0]*blockLenF)*wRcpB - srcColor[0])*blockLenRcp,
((color[1] + dCdx[1]*blockLenF)*wRcpB - srcColor[1])*blockLenRcp,
((color[2] + dCdx[2]*blockLenF)*wRcpB - srcColor[2])*blockLenRcp,
((color[3] + dCdx[3]*blockLenF)*wRcpB - srcColor[3])*blockLenRcp
};
#ifdef SW_ENABLE_TEXTURE
// Perspective-correct UVs at both endpoints, then affine gradient
float uAffine = u*wRcpA;
float vAffine = v*wRcpA;
float dUaffine = ((u + dUdx*blockLenF)*wRcpB - uAffine)*blockLenRcp;
float dVaffine = ((v + dVdx*blockLenF)*wRcpB - vAffine)*blockLenRcp;
#endif
// Inner span pixel loop
for (; x < blockEnd; x++)
{
#ifdef SW_ENABLE_DEPTH_TEST
{
/* TODO: Implement different depth funcs? */
float depth = SW_FRAMEBUFFER_DEPTH_GET(dPtr, 0);
if (z > depth) goto discard;
/* TODO: Implement depth mask */
SW_FRAMEBUFFER_DEPTH_SET(dPtr, z, 0);
}
#endif
@ -5337,16 +5362,26 @@ static void SW_RASTER_TRIANGLE_SPAN(const sw_vertex_t *start, const sw_vertex_t
#ifdef SW_ENABLE_TEXTURE
{
float texColor[4];
float s = u*wRcp;
float t = v*wRcp;
sw_texture_sample(texColor, RLSW.boundTexture, s, t, dUdx, dUdy, dVdx, dVdy);
srcColor[0] *= texColor[0];
srcColor[1] *= texColor[1];
srcColor[2] *= texColor[2];
srcColor[3] *= texColor[3];
sw_texture_sample(texColor, RLSW.boundTexture, uAffine, vAffine, dUdx, dUdy, dVdx, dVdy);
float finalColor[4] = {
srcColor[0]*texColor[0],
srcColor[1]*texColor[1],
srcColor[2]*texColor[2],
srcColor[3]*texColor[3]
};
#ifdef SW_ENABLE_BLEND
{
float dstColor[4];
SW_FRAMEBUFFER_COLOR_GET(dstColor, cPtr, 0);
RLSW.blendFunc(dstColor, finalColor);
SW_FRAMEBUFFER_COLOR_SET(cPtr, dstColor, 0);
}
#else
SW_FRAMEBUFFER_COLOR_SET(cPtr, finalColor, 0);
#endif
}
#else
{
#ifdef SW_ENABLE_BLEND
{
float dstColor[4];
@ -5355,18 +5390,16 @@ static void SW_RASTER_TRIANGLE_SPAN(const sw_vertex_t *start, const sw_vertex_t
SW_FRAMEBUFFER_COLOR_SET(cPtr, dstColor, 0);
}
#else
{
SW_FRAMEBUFFER_COLOR_SET(cPtr, srcColor, 0);
#endif
}
#endif
// Increment the interpolation parameter, UVs, and pointers
discard:
w += dWdx;
color[0] += dCdx[0];
color[1] += dCdx[1];
color[2] += dCdx[2];
color[3] += dCdx[3];
srcColor[0] += dSrcColordx[0];
srcColor[1] += dSrcColordx[1];
srcColor[2] += dSrcColordx[2];
srcColor[3] += dSrcColordx[3];
cPtr += SW_FRAMEBUFFER_COLOR_SIZE;
#ifdef SW_ENABLE_DEPTH_TEST
@ -5378,11 +5411,25 @@ static void SW_RASTER_TRIANGLE_SPAN(const sw_vertex_t *start, const sw_vertex_t
#ifdef SW_ENABLE_TEXTURE
{
u += dUdx;
v += dVdx;
uAffine += dUaffine;
vAffine += dVaffine;
}
#endif
}
// Advance perspective-space accumulators by the full block width
w = wB;
color[0] += dCdx[0]*blockLenF;
color[1] += dCdx[1]*blockLenF;
color[2] += dCdx[2]*blockLenF;
color[3] += dCdx[3]*blockLenF;
#ifdef SW_ENABLE_TEXTURE
u += dUdx*blockLenF;
v += dVdx*blockLenF;
#endif
}
#undef SW_AFFINE_BLOCK
}
static void SW_RASTER_TRIANGLE(const sw_vertex_t *v0, const sw_vertex_t *v1, const sw_vertex_t *v2)