diff options
Diffstat (limited to 'source/blender/draw/intern/shaders/common_view_lib.glsl')
| -rw-r--r-- | source/blender/draw/intern/shaders/common_view_lib.glsl | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/source/blender/draw/intern/shaders/common_view_lib.glsl b/source/blender/draw/intern/shaders/common_view_lib.glsl index 2f2125ad813..1a28a307163 100644 --- a/source/blender/draw/intern/shaders/common_view_lib.glsl +++ b/source/blender/draw/intern/shaders/common_view_lib.glsl @@ -48,6 +48,26 @@ mat4 extract_matrix_packed_data(mat4 mat, out vec4 dataA, out vec4 dataB) return mat; } +/* Same here, Not the right place but need to be common to all overlay's. + * TODO Split to an overlay lib. */ +/* edge_start and edge_pos needs to be in the range [0..sizeViewport]. */ +vec4 pack_line_data(vec2 frag_co, vec2 edge_start, vec2 edge_pos) +{ + vec2 edge = edge_start - edge_pos; + float len = length(edge); + if (len > 0.0) { + edge /= len; + vec2 perp = vec2(-edge.y, edge.x); + float dist = dot(perp, frag_co - edge_start); + /* Add 0.1 to diffenrentiate with cleared pixels. */ + return vec4(perp * 0.5 + 0.5, dist * 0.25 + 0.5 + 0.1, 0.0); + } + else { + /* Default line if the origin is perfectly aligned with a pixel. */ + return vec4(1.0, 0.0, 0.5 + 0.1, 0.0); + } +} + uniform int resourceChunk; #ifdef GPU_VERTEX_SHADER |