Go nuts with Qt

[ipdf/code.git] / src / shaders / bezier_texbuf_geom.glsl

diff --git a/src/shaders/bezier_texbuf_geom.glsl b/src/shaders/bezier_texbuf_geom.glsl
index bb9a219..281627d 100644 (file)
--- a/src/shaders/bezier_texbuf_geom.glsl
+++ b/src/shaders/bezier_texbuf_geom.glsl
@@ -19,9 +19,11 @@ void main()
 {
        int bezierid = texelFetch(bezier_id_buffer_texture, objectid[0]).r;
        vec2 boundssize = gl_in[1].gl_Position.xy - gl_in[0].gl_Position.xy;
-       vec2 coeff0 = texelFetch(bezier_buffer_texture, bezierid*3).rg;
-       vec2 coeff1 = texelFetch(bezier_buffer_texture, bezierid*3+1).rg;
-       vec2 coeff2 = texelFetch(bezier_buffer_texture, bezierid*3+2).rg;
+       vec2 coeff0 = texelFetch(bezier_buffer_texture, bezierid*4).rg;
+       vec2 coeff1 = texelFetch(bezier_buffer_texture, bezierid*4+1).rg;
+       vec2 coeff2 = texelFetch(bezier_buffer_texture, bezierid*4+2).rg;
+       vec2 coeff3 = texelFetch(bezier_buffer_texture, bezierid*4+3).rg;
+
        vec2 boundspxsize = pixsize[0];
        int blen = clamp(int(abs(boundspxsize.x)),2,100);
        float invblen = 1.0f/float(blen);
@@ -29,10 +31,11 @@ void main()
        {
                float t = i * invblen;
                float oneminust = 1.0f - t;
-               float bernstein0 = t*t;
-               float bernstein1 = 2*t*oneminust;
-               float bernstein2 = oneminust*oneminust;
-               gl_Position = vec4((coeff0*bernstein0 + coeff1*bernstein1 + coeff2*bernstein2) * boundssize + gl_in[0].gl_Position.xy, 0.0, 1.0);
+               float bernstein0 = t*t*t;
+               float bernstein1 = 3*t*t*oneminust;
+               float bernstein2 = 3*t*oneminust*oneminust;
+               float bernstein3 = oneminust*oneminust*oneminust;
+               gl_Position = vec4((coeff0*bernstein0 + coeff1*bernstein1 + coeff2*bernstein2 + coeff3*bernstein3) * boundssize + gl_in[0].gl_Position.xy, 0.0, 1.0);
                EmitVertex();
                
        }