Differential D2889 Diff 11446 source/blender/draw/engines/gpencil/shaders/gpencil_point_geom.glsl

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source/blender/draw/engines/gpencil/shaders/gpencil_point_geom.glsl

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				uniform mat4 ModelViewProjectionMatrix;
				uniform vec2 Viewport;
				uniform int xraymode;

				layout(points) in;
				layout(triangle_strip, max_vertices = 4) out;

				in vec4 finalColor[1];
				in float finalThickness[1];
				in vec2 finaluvdata[1];

				out vec4 mColor;
				out vec2 mTexCoord;

				#define GP_XRAY_FRONT 0
				#define GP_XRAY_3DSPACE 1
				#define GP_XRAY_BACK 2

				/* project 3d point to 2d on screen space */
				vec2 toScreenSpace(vec4 vertex)
				{
				return vec2(vertex.xy / vertex.w) * Viewport;
				}

				/* get zdepth value */
				float getZdepth(vec4 point)
				{
				if (xraymode == GP_XRAY_FRONT) {
				return 0.0;
				}
				if (xraymode == GP_XRAY_3DSPACE) {
				return (point.z / point.w);
				}
				if (xraymode == GP_XRAY_BACK) {
				return 0.999999;
				}

				/* in front by default */
				return 0.0;
				}

				vec2 rotateUV(vec2 uv, float angle)
				{
				/* translate center of rotation to the center of texture */
				vec2 new_uv = uv - vec2(0.5f, 0.5f);
				vec2 rot_uv;
				rot_uv.x = new_uv.x * cos(angle) - new_uv.y * sin(angle);
				rot_uv.y = new_uv.y * cos(angle) + new_uv.x * sin(angle);
				return rot_uv + vec2(0.5f, 0.5f);
				}

				void main(void)
				{
				/* receive 4 points */
				vec4 P0 = gl_in[0].gl_Position;
				vec2 sp0 = toScreenSpace(P0);

				float size = finalThickness[0];
				float aspect = 1.0;
				/* generate the triangle strip */
				mTexCoord = rotateUV(vec2(0, 1), finaluvdata[0].y);
				mColor = finalColor[0];
				gl_Position = vec4(vec2(sp0.x - size, sp0.y + size * aspect) / Viewport, getZdepth(P0), 1.0);
				EmitVertex();

				mTexCoord = rotateUV(vec2(0, 0), finaluvdata[0].y);
				mColor = finalColor[0];
				gl_Position = vec4(vec2(sp0.x - size, sp0.y - size * aspect) / Viewport, getZdepth(P0), 1.0);
				EmitVertex();

				mTexCoord = rotateUV(vec2(1, 1), finaluvdata[0].y);
				mColor = finalColor[0];
				gl_Position = vec4(vec2(sp0.x + size, sp0.y + size * aspect) / Viewport, getZdepth(P0), 1.0);
				EmitVertex();

				mTexCoord = rotateUV(vec2(1, 0), finaluvdata[0].y);
				mColor = finalColor[0];
				gl_Position = vec4(vec2(sp0.x + size, sp0.y - size * aspect) / Viewport, getZdepth(P0), 1.0);
				EmitVertex();

				EndPrimitive();
				}