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Implement background texture

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This commit is contained in:
jgk
2021-02-21 12:00:40 +01:00
parent df0f07fbca
commit 2f7ab06aa4
6 changed files with 96 additions and 42 deletions
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shader/background.geom
+16 -6
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@@ -5,22 +5,32 @@ in vec4 vParams [];
in vec2 vWinSize [];
out vec2 gTexPos;
vec2 rotBy( float rot, vec2 v)
{
return vec2 ( v.x * cos(rot) - v.y * sin(rot)
, v.x * sin(rot) + v.y * cos(rot)
);
}
void main()
{
vec2 cPos = vec2(vParams[0].x / 250 , vParams[0].y /250 );
float zoom = vParams[0].w;
float xoff = vWinSize[0].x / (500*zoom) ;
float yoff = vWinSize[0].y / (500*zoom) ;
gTexPos = vec2 (cPos.x + xoff,cPos.y + yoff);
float rot = 0 - vParams[0].z;
float x = vWinSize[0].x / (500*zoom) ;
float y = vWinSize[0].y / (500*zoom) ;
gTexPos = cPos + rotBy(-rot , vec2(x,y));
gl_Position = vec4 (1,1,0.9,1);
EmitVertex();
gTexPos = vec2 (cPos.x + xoff,cPos.y - yoff);
gTexPos = cPos + rotBy(-rot , vec2(x,-y));
gl_Position = vec4 (1,-1,0.9,1);
EmitVertex();
gTexPos = vec2 (cPos.x - xoff,cPos.y + yoff);
gTexPos = cPos + rotBy(-rot , vec2(-x,y));
gl_Position = vec4 (-1,1,0.9,1);
EmitVertex();
gTexPos = vec2 (cPos.x - xoff,cPos.y - yoff);
gTexPos = cPos + rotBy(-rot , vec2(-x,-y));
gl_Position = vec4 (-1,-1,0.9,1);
EmitVertex();