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TINYGL: Implemented alpha interpolation in triangle rasterization routine.

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This commit is contained in:
Stefano Musumeci 2014-06-19 17:30:28 +02:00
parent 03072c4b7b
commit 63fd685589
13 changed files with 320 additions and 163 deletions
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41
graphics/tinygl/zline.cpp
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@ -6,30 +6,31 @@ namespace TinyGL {
#define ZCMP(z,zpix) ((z) >= (zpix))
template <bool interpRGB, bool interpZ>
FORCEINLINE static void putPixel(FrameBuffer *buffer, int pixelOffset, const Graphics::PixelFormat &cmode, unsigned int *pz, unsigned int &z, int &color, unsigned int &r, unsigned int &g, unsigned int &b) {
FORCEINLINE static void putPixel(FrameBuffer *buffer, int pixelOffset,
const Graphics::PixelFormat &cmode, unsigned int *pz, unsigned int &z, int &color, unsigned int &r,
unsigned int &g, unsigned int &b) {
if (interpZ) {
if (ZCMP(z, *pz)) {
if (interpRGB) {
buffer->writePixel(pixelOffset,RGB_TO_PIXEL(r >> 8,g >> 8,b >> 8));
}
else {
buffer->writePixel(pixelOffset,color);
buffer->writePixel(pixelOffset, RGB_TO_PIXEL(r >> 8, g >> 8, b >> 8));
} else {
buffer->writePixel(pixelOffset, color);
}
*pz = z;
}
}
else {
} else {
if (interpRGB) {
buffer->writePixel(pixelOffset,RGB_TO_PIXEL(r >> 8,g >> 8,b >> 8));
}
else {
buffer->writePixel(pixelOffset,color);
buffer->writePixel(pixelOffset, RGB_TO_PIXEL(r >> 8, g >> 8, b >> 8));
} else {
buffer->writePixel(pixelOffset, color);
}
}
}
template <bool interpRGB, bool interpZ>
FORCEINLINE static void drawLine(FrameBuffer *buffer, ZBufferPoint *p1, ZBufferPoint *p2, int &pixelOffset, const Graphics::PixelFormat &cmode, unsigned int *pz, unsigned int &z, int &color, unsigned int &r, unsigned int &g, unsigned int &b, int dx, int dy, int inc_1, int inc_2) {
FORCEINLINE static void drawLine(FrameBuffer *buffer, ZBufferPoint *p1, ZBufferPoint *p2,
int &pixelOffset, const Graphics::PixelFormat &cmode, unsigned int *pz, unsigned int &z, int &color,
unsigned int &r, unsigned int &g, unsigned int &b, int dx, int dy, int inc_1, int inc_2) {
int n = dx;
int rinc, ginc, binc;
int zinc;
@ -47,7 +48,7 @@ FORCEINLINE static void drawLine(FrameBuffer *buffer, ZBufferPoint *p1, ZBufferP
int pp_inc_1 = (inc_1);
int pp_inc_2 = (inc_2);
do {
putPixel<interpRGB,interpZ>(buffer, pixelOffset, cmode, pz, z, color, r, g, b);
putPixel<interpRGB, interpZ>(buffer, pixelOffset, cmode, pz, z, color, r, g, b);
if (interpZ) {
z += zinc;
}
@ -101,19 +102,23 @@ void FrameBuffer::fillLine(ZBufferPoint *p1, ZBufferPoint *p2, int color) {
}
if (dx == 0 && dy == 0) {
putPixel<interpRGB,interpZ>(this, pixelOffset, cmode, pz, z, color, r, g, b);
putPixel<interpRGB, interpZ>(this, pixelOffset, cmode, pz, z, color, r, g, b);
} else if (dx > 0) {
if (dx >= dy) {
drawLine<interpRGB,interpZ>(this, p1, p2, pixelOffset, cmode, pz, z, color, r, g, b, dx, dy, sx + 1, 1);
drawLine<interpRGB, interpZ>(this, p1, p2, pixelOffset, cmode, pz, z, color, r, g, b, dx, dy, sx + 1,
1);
} else {
drawLine<interpRGB,interpZ>(this, p1, p2, pixelOffset, cmode, pz, z, color, r, g, b, dx, dy, sx + 1, sx);
drawLine<interpRGB, interpZ>(this, p1, p2, pixelOffset, cmode, pz, z, color, r, g, b, dx, dy, sx + 1,
sx);
}
} else {
dx = -dx;
if (dx >= dy) {
drawLine<interpRGB,interpZ>(this, p1, p2, pixelOffset, cmode, pz, z, color, r, g, b, dx, dy, sx - 1, -1);
drawLine<interpRGB, interpZ>(this, p1, p2, pixelOffset, cmode, pz, z, color, r, g, b, dx, dy, sx - 1,
-1);
} else {
drawLine<interpRGB,interpZ>(this, p1, p2, pixelOffset, cmode, pz, z, color, r, g, b, dx, dy, sx - 1, sx);
drawLine<interpRGB,interpZ>(this, p1, p2, pixelOffset, cmode, pz, z, color, r, g, b, dx, dy, sx - 1,
sx);
}
}
}