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Better conditional line math.

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This commit is contained in:
Leonardo Zide 2021-03-14 11:31:50 -07:00
parent a2aa03c4fa
commit 9db8a0112a
1 changed files with 10 additions and 8 deletions
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16
resources/shaders/unlit_color_conditional_vs.glsl
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@ -18,13 +18,15 @@ void main()
p3 /= p3.w;
p4 /= p4.w;
if (((p1.y - p2.y) * (p3.x - p1.x) + (p2.x - p1.x) * (p3.y - p1.y)) * ((p1.y - p2.y) * (p4.x - p1.x) + (p2.x - p1.x) * (p4.y - p1.y)) >= 0.0)
{
if (((p2.y - p1.y) * (p3.x - p2.x) + (p1.x - p2.x) * (p3.y - p2.y)) * ((p2.y - p1.y) * (p4.x - p2.x) + (p1.x - p2.x) * (p4.y - p2.y)) >= 0.0)
vec2 Line = p2.xy - p1.xy;
vec2 Cond1 = p3.xy - p1.xy;
vec2 Cond2 = p4.xy - p1.xy;
float Cross1 = Line.x * Cond1.y - Line.y * Cond1.x;
float Cross2 = Line.x * Cond2.y - Line.y * Cond2.x;
if (sign(Cross1) == sign(Cross2))
gl_Position = Position;
else
gl_Position = vec4(0.0, 0.0, 0.0, 0.0);
}
else
gl_Position = vec4(0.0, 0.0, 0.0, 0.0);
gl_Position = vec4(2.0, 2.0, 2.0, 1.0);
}