archive/blender-archive
Archived
1
1
Fork 0
Code Pull Requests Packages Activity

Object Mode: Grid: Make antialiasing more grounded

Browse Source 
Went a bit anal on this but at least we will have a decent AA reference
for lines in the future.
This commit is contained in:
Clément Foucault
2018-11-09 14:37:35 +01:00
parent 9c1c2a40bf
commit 36e6a41f6f
1 changed files with 12 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
source/blender/draw/modes/shaders/object_grid_frag.glsl
View File

@@ -32,8 +32,18 @@ uniform int gridFlag;
#define PLANE_YZ (1 << 6)
#define GRID_BACK (1 << 9) /* grid is behind objects */
#define GRID_LINE_SMOOTH_START -0.1
#define GRID_LINE_SMOOTH_END 1.05
#define M_1_SQRTPI 0.5641895835477563 /* 1/sqrt(pi) */
/**
* We want to know how much a pixel is covered by a line.
* We replace the square pixel with acircle of the same area and try to find the intersection area.
* The area we search is the circular segment. https://en.wikipedia.org/wiki/Circular_segment
* The formula for the area uses inverse trig function and is quite complexe.
* Instead, we approximate it by using the smoothstep function and a 1.05 factor to the disc radius.
**/
#define DISC_RADIUS (M_1_SQRTPI * 1.05)
#define GRID_LINE_SMOOTH_START (0.5 - DISC_RADIUS)
#define GRID_LINE_SMOOTH_END (0.5 + DISC_RADIUS)
float get_grid(vec2 co, vec2 fwidthCos, float grid_size)
{