Differential D2294 Diff 7609 source/blender/gpu/shaders/gpu_shader_2D_bezier_curve_geo.glsl

Changeset View

Standalone View

source/blender/gpu/shaders/gpu_shader_2D_bezier_curve_geo.glsl

This file was added.

				#define SUB 24
				#define ARROW_SIZE 7
				uniform int drawarrow;
				uniform vec2 h1, h2;
				uniform mat4 ModelViewProjectionMatrix;

				layout(lines) in;
				layout(line_strip, max_vertices = 27) out;
				noperspective in vec4 finalColor[];

				out vec4 FBColor;

				void draw_arrow(in vec3 coo_1, in vec3 coo_2)
				{
				vec3 d_xy, arrow, arrow_1, arrow_2;
				float len;

				d_xy = coo_1 - coo_2;
				len = length(d_xy);
				d_xy *= ARROW_SIZE / len;
				arrow_1.x = coo_1.x - d_xy.x + d_xy.y;
				arrow_1.y = coo_1.y - d_xy.x - d_xy.y;

				arrow_2.x = coo_1.x - d_xy.x - d_xy.y;
				arrow_2.y = coo_1.y + d_xy.x - d_xy.y;

				arrow = coo_1;

				FBColor.rgb = finalColor[0].rgb;
				gl_Position = ModelViewProjectionMatrix * vec4( arrow_1, 1.0 );
				EmitVertex();
				FBColor.rgb = finalColor[0].rgb;
				gl_Position = ModelViewProjectionMatrix * vec4( arrow, 1.0 );
				EmitVertex();
				FBColor.rgb = finalColor[0].rgb;
				gl_Position = ModelViewProjectionMatrix * vec4( arrow_2, 1.0 );
				EmitVertex();
				EndPrimitive();
				}

				vec3 evaluateBezierPosition( vec3 v[4], float t )
				{
				vec3 p;
				float OneMinusT = 1.0 - t;
				float b0 = OneMinusTOneMinusTOneMinusT;
				float b1 = 3.0tOneMinusT*OneMinusT;
				float b2 = 3.0tt*OneMinusT;
				float b3 = ttt;
				return b0v[0] + b1v[1] + b2v[2] + b3v[3];
				}

				void main()
				{
				vec3 b[4], coo_1, coo_2;
				b[0] = gl_in[0].gl_Position.xyz;
				b[1] = vec3(h1, 0.0);
				b[2] = vec3(h2, 0.0);
				b[3] = gl_in[1].gl_Position.xyz;

				float OneOverDetail = 1.0 / float(SUB - 1);

				for( int i = 0; i < SUB; i++ )
				{
				float t = i * OneOverDetail;
				vec3 p = evaluateBezierPosition( b, t );
				if (i == SUB/2 -1) coo_2 = p.xyz;
				if (i == SUB/2) coo_1 = p.xyz;
				FBColor.rgb = finalColor[0].rgb * (SUB-i)/SUB + finalColor[1].rgb * (i)/SUB;
				gl_Position = ModelViewProjectionMatrix * vec4( p.xyz, 1.0 );
				EmitVertex();
				}
				EndPrimitive();

				if (drawarrow == 1) draw_arrow(coo_1, coo_2);

				}
				merwinUnsubmitted Not Done Inline Actions Can this go in the "if (drawarrow" block below? merwin: Can this go in the "if (drawarrow" block below?