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softgpu: Implement alpha blending.

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This commit is contained in:
Tony Wasserka 2013-07-03 21:05:18 +02:00 committed by neobrain
parent df40c76da9
commit 247ea278c8
1 changed files with 106 additions and 20 deletions
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126
GPU/Software/Rasterizer.cpp
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@ -275,26 +275,112 @@ void DrawTriangle(VertexData vertexdata[3])
// TODO: Fogging
// TODO: Finish alpha blending support
// if (!gstate.isAlphaBlendEnabled())
SetPixelColor(p.x, p.y, Vec4<int>(prim_color_rgb.r(), prim_color_rgb.g(), prim_color_rgb.b(), prim_color_a).ToRGBA());
/* else {
u32 dst = GetPixelColor(p.x, p.y);
u32 A, B;
SET_R(A, GET_A(prim_color));
SET_G(A, GET_A(prim_color));
SET_B(A, GET_A(prim_color));
SET_A(A, GET_A(prim_color));
SET_R(B, 255 - GET_A(prim_color));
SET_G(B, 255 - GET_A(prim_color));
SET_B(B, 255 - GET_A(prim_color));
SET_A(B, 255 - GET_A(prim_color));
SET_R(prim_color, (GET_R(prim_color)*GET_R(A)+GET_R(dst)*GET_R(B))/255);
SET_G(prim_color, (GET_G(prim_color)*GET_G(A)+GET_G(dst)*GET_G(B))/255);
SET_B(prim_color, (GET_B(prim_color)*GET_B(A)+GET_B(dst)*GET_B(B))/255);
SET_A(prim_color, (GET_A(prim_color)*GET_A(A)+GET_A(dst)*GET_A(B))/255);
SetPixelColor(p.x, p.y, prim_color.Compactify());
}*/
if (gstate.isAlphaBlendEnabled()) {
Vec4<int> dst = Vec4<int>::FromRGBA(GetPixelColor(p.x, p.y));
Vec3<int> srccol(0, 0, 0);
Vec3<int> dstcol(0, 0, 0);
switch (gstate.getBlendFuncA()) {
case GE_SRCBLEND_DSTCOLOR:
srccol = dst.rgb();
break;
case GE_SRCBLEND_INVDSTCOLOR:
srccol = Vec3<int>::AssignToAll(255) - dst.rgb();
break;
case GE_SRCBLEND_SRCALPHA:
srccol = Vec3<int>::AssignToAll(prim_color_a);
break;
case GE_SRCBLEND_INVSRCALPHA:
srccol = Vec3<int>::AssignToAll(255 - prim_color_a);
break;
case GE_SRCBLEND_DSTALPHA:
srccol = Vec3<int>::AssignToAll(dst.a());
break;
case GE_SRCBLEND_INVDSTALPHA:
srccol = Vec3<int>::AssignToAll(255 - dst.a());
break;
case GE_SRCBLEND_DOUBLESRCALPHA:
srccol = 2 * Vec3<int>::AssignToAll(prim_color_a);
break;
case GE_SRCBLEND_DOUBLEINVSRCALPHA:
srccol = 2 * Vec3<int>::AssignToAll(255 - prim_color_a);
break;
case GE_SRCBLEND_DOUBLEDSTALPHA:
srccol = 2 * Vec3<int>::AssignToAll(dst.a());
break;
case GE_SRCBLEND_DOUBLEINVDSTALPHA:
srccol = 2 * Vec3<int>::AssignToAll(255 - dst.a());
break;
case GE_SRCBLEND_FIXA:
srccol = Vec4<int>::FromRGBA(gstate.getFixA()).rgb();
break;
}
switch (gstate.getBlendFuncB()) {
GE_DSTBLEND_SRCCOLOR:
dstcol = prim_color_rgb;
break;
GE_DSTBLEND_INVSRCCOLOR:
dstcol = Vec3<int>::AssignToAll(255) - prim_color_rgb;
break;
GE_DSTBLEND_SRCALPHA:
dstcol = Vec3<int>::AssignToAll(prim_color_a);
break;
GE_DSTBLEND_INVSRCALPHA:
dstcol = Vec3<int>::AssignToAll(255 - prim_color_a);
break;
GE_DSTBLEND_DSTALPHA:
dstcol = Vec3<int>::AssignToAll(dst.a());
break;
GE_DSTBLEND_INVDSTALPHA:
dstcol = Vec3<int>::AssignToAll(255 - dst.a());
break;
GE_DSTBLEND_DOUBLESRCALPHA:
dstcol = 2 * Vec3<int>::AssignToAll(prim_color_a);
break;
GE_DSTBLEND_DOUBLEINVSRCALPHA:
dstcol = 2 * Vec3<int>::AssignToAll(255 - prim_color_a);
break;
GE_DSTBLEND_DOUBLEDSTALPHA:
dstcol = 2 * Vec3<int>::AssignToAll(dst.a());
break;
GE_DSTBLEND_DOUBLEINVDSTALPHA:
dstcol = 2 * Vec3<int>::AssignToAll(255 - dst.a());
break;
GE_DSTBLEND_FIXB:
dstcol = Vec4<int>::FromRGBA(gstate.getFixB()).rgb();
break;
}
switch (gstate.getBlendEq()) {
case GE_BLENDMODE_MUL_AND_ADD:
prim_color_rgb = (prim_color_rgb * srccol + dst.rgb() * dstcol) / 255;
break;
case GE_BLENDMODE_MUL_AND_SUBTRACT:
prim_color_rgb = (prim_color_rgb * srccol - dst.rgb() * dstcol) / 255;
break;
case GE_BLENDMODE_MUL_AND_SUBTRACT_REVERSE:
prim_color_rgb = (dst.rgb() * dstcol - prim_color_rgb * srccol) / 255;
break;
case GE_BLENDMODE_MIN:
prim_color_rgb.r() = std::min(prim_color_rgb.r(), dst.r());
prim_color_rgb.g() = std::min(prim_color_rgb.g(), dst.g());
prim_color_rgb.b() = std::min(prim_color_rgb.b(), dst.b());
break;
case GE_BLENDMODE_MAX:
prim_color_rgb.r() = std::max(prim_color_rgb.r(), dst.r());
prim_color_rgb.g() = std::max(prim_color_rgb.g(), dst.g());
prim_color_rgb.b() = std::max(prim_color_rgb.b(), dst.b());
break;
case GE_BLENDMODE_ABSDIFF:
prim_color_rgb.r() = ::abs(prim_color_rgb.r() - dst.r());
prim_color_rgb.g() = ::abs(prim_color_rgb.g() - dst.g());
prim_color_rgb.b() = ::abs(prim_color_rgb.b() - dst.b());
break;
}
}
SetPixelColor(p.x, p.y, Vec4<int>(prim_color_rgb.r(), prim_color_rgb.g(), prim_color_rgb.b(), prim_color_a).ToRGBA());
}
}
}