diff options
Diffstat (limited to 'source/blender/draw/modes/shaders/object_grid_frag.glsl')
| -rw-r--r-- | source/blender/draw/modes/shaders/object_grid_frag.glsl | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/source/blender/draw/modes/shaders/object_grid_frag.glsl b/source/blender/draw/modes/shaders/object_grid_frag.glsl new file mode 100644 index 00000000000..9b1283e46af --- /dev/null +++ b/source/blender/draw/modes/shaders/object_grid_frag.glsl @@ -0,0 +1,147 @@ + +/* Infinite grid + * Clément Foucault */ + +in vec3 wPos; + +out vec4 FragColor; + +uniform mat4 ProjectionMatrix; +uniform vec3 cameraPos; +uniform vec3 eye; +uniform vec4 gridSettings; +uniform float gridOneOverLogSubdiv; + +#define gridDistance gridSettings.x +#define gridResolution gridSettings.y +#define gridScale gridSettings.z +#define gridSubdiv gridSettings.w + +uniform int gridFlag; + +#define AXIS_X (1 << 0) +#define AXIS_Y (1 << 1) +#define AXIS_Z (1 << 2) +#define GRID (1 << 3) +#define PLANE_XY (1 << 4) +#define PLANE_XZ (1 << 5) +#define PLANE_YZ (1 << 6) + +#define GRID_LINE_SMOOTH 1.15 + +float grid(vec3 uv, vec3 fwidthCos, float grid_size) +{ + float half_size = grid_size / 2.0; + /* triangular wave pattern, amplitude is [0, grid_size] */ + vec3 grid_domain = abs(mod(uv + half_size, grid_size) - half_size); + /* modulate by the absolute rate of change of the uvs + * (make lines have the same width under perspective) */ + grid_domain /= fwidthCos; + + /* collapse waves and normalize */ + grid_domain.x = min(grid_domain.x, min(grid_domain.y, grid_domain.z)) / grid_size; + + return 1.0 - smoothstep(0.0, GRID_LINE_SMOOTH / grid_size, grid_domain.x); +} + +float axis(float u, float fwidthU, float line_size) +{ + float axis_domain = abs(u); + /* modulate by the absolute rate of change of the uvs + * (make line have the same width under perspective) */ + axis_domain /= fwidthU; + + return 1.0 - smoothstep(0.0, GRID_LINE_SMOOTH, axis_domain - line_size); +} + +void main() +{ + vec3 fwidthCos = fwidth(wPos); + + float dist, fade; + /* if persp */ + if (ProjectionMatrix[3][3] == 0.0) { + vec3 viewvec = cameraPos - wPos; + dist = length(viewvec); + viewvec /= dist; + + float angle; + if ((gridFlag & PLANE_XZ) > 0) + angle = viewvec.y; + else if ((gridFlag & PLANE_YZ) > 0) + angle = viewvec.x; + else + angle = viewvec.z; + + angle = 1.0 - abs(angle); + fade = 1.0 - angle * angle; + fade *= 1.0 - smoothstep(0.0, gridDistance, dist - gridDistance); + } + else { + dist = abs(gl_FragCoord.z * 2.0 - 1.0); + fade = 1.0 - smoothstep(0.0, 0.5, dist - 0.5); + dist = 1.0; /* avoid branch after */ + + if ((gridFlag & PLANE_XY) > 0) { + float angle = 1.0 - abs(eye.z); + fade *= 1.0 - angle * angle * angle; + dist = 1.0 + angle * 2.0; + } + } + + if ((gridFlag & GRID) > 0) { + float grid_res = log(dist * gridResolution) * gridOneOverLogSubdiv; + + float blend = fract(-max(grid_res, 0.0)); + float lvl = floor(grid_res); + + /* from smallest to biggest */ + float scaleA = gridScale * pow(gridSubdiv, max(lvl - 1.0, 0.0)); + float scaleB = gridScale * pow(gridSubdiv, max(lvl + 0.0, 0.0)); + float scaleC = gridScale * pow(gridSubdiv, max(lvl + 1.0, 1.0)); + + float gridA = grid(wPos, fwidthCos, scaleA); + float gridB = grid(wPos, fwidthCos, scaleB); + float gridC = grid(wPos, fwidthCos, scaleC); + + FragColor = vec4(colorGrid.rgb, gridA * blend); + FragColor = mix(FragColor, vec4(mix(colorGrid.rgb, colorGridEmphasise.rgb, blend), 1.0), gridB); + FragColor = mix(FragColor, vec4(colorGridEmphasise.rgb, 1.0), gridC); + } + else { + FragColor = vec4(colorGrid.rgb, 0.0); + } + + if ((gridFlag & AXIS_X) > 0) { + float xAxis; + if ((gridFlag & PLANE_XZ) > 0) { + xAxis = axis(wPos.z, fwidthCos.z, 0.1); + } + else { + xAxis = axis(wPos.y, fwidthCos.y, 0.1); + } + FragColor = mix(FragColor, colorGridAxisX, xAxis); + } + if ((gridFlag & AXIS_Y) > 0) { + float yAxis; + if ((gridFlag & PLANE_YZ) > 0) { + yAxis = axis(wPos.z, fwidthCos.z, 0.1); + } + else { + yAxis = axis(wPos.x, fwidthCos.x, 0.1); + } + FragColor = mix(FragColor, colorGridAxisY, yAxis); + } + if ((gridFlag & AXIS_Z) > 0) { + float zAxis; + if ((gridFlag & PLANE_YZ) > 0) { + zAxis = axis(wPos.y, fwidthCos.y, 0.1); + } + else { + zAxis = axis(wPos.x, fwidthCos.x, 0.1); + } + FragColor = mix(FragColor, colorGridAxisZ, zAxis); + } + + FragColor.a *= fade; +}
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