X-Git-Url: https://git.ucc.asn.au/?p=ipdf%2Fcode.git;a=blobdiff_plain;f=src%2Fshaders%2Fbezier_texbuf_geom.glsl;h=13812efb165277877dc48178488095f6a09fe17a;hp=caf7a10fa0aa0c1798d46d890c47784f956a310e;hb=0361b11485ec41d2c2ddeb279abf846f777f5363;hpb=a216eaae3899c5f0e8dc2ea60a379df1c449e5cf

diff --git a/src/shaders/bezier_texbuf_geom.glsl b/src/shaders/bezier_texbuf_geom.glsl
index caf7a10..13812ef 100644
--- a/src/shaders/bezier_texbuf_geom.glsl
+++ b/src/shaders/bezier_texbuf_geom.glsl
@@ -4,28 +4,50 @@ uniform samplerBuffer bezier_buffer_texture;
 uniform isamplerBuffer bezier_id_buffer_texture; 
 
 layout(lines) in;
-layout(line_strip, max_vertices = 101) out;
+layout(line_strip, max_vertices = 105) out;
 
 in int objectid[];
+in vec2 pixsize[];
+
+//TODO: I thought this might be useful, maybe not.
+float areatriangle(vec2 a, vec2 b, vec2 c)
+{
+	return (c.y-a.y)*(b.y-a.y) - (b.x - a.x)*(c.x-a.x);
+}
 
 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 + gl_in[0].gl_Position.xy ;
-	vec2 coeff1 = texelFetch(bezier_buffer_texture, bezierid*3+1).rg * boundssize + gl_in[0].gl_Position.xy;
-	vec2 coeff2 = texelFetch(bezier_buffer_texture, bezierid*3+2).rg * boundssize + gl_in[0].gl_Position.xy;
-	for (int i = 0; i <= 100; ++i)
+	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);
+	for (int i = 0; i <= blen; ++i)
 	{
-		float t = i * 0.01f;
+		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, 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();
 		
 	}
 	EndPrimitive();
+/*	gl_Position = vec4(coeff0 * boundssize + gl_in[0].gl_Position.xy, 0.0, 1.0);
+	EmitVertex();
+	gl_Position = vec4(coeff1 * boundssize + gl_in[0].gl_Position.xy, 0.0, 1.0);
+	EmitVertex();
+	gl_Position = vec4(coeff2 * boundssize + gl_in[0].gl_Position.xy, 0.0, 1.0);
+	EmitVertex();
+	gl_Position = vec4(coeff3 * boundssize + gl_in[0].gl_Position.xy, 0.0, 1.0);
+	EmitVertex();
+	EndPrimitive();*/
 }