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Draw grid lines using shader

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fieldOfView 2017-09-11 23:39:54 +02:00
parent a4aa134f25
commit 6658e1a9ae
4 changed files with 37 additions and 14 deletions
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40
resources/shaders/grid.shader
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@ -14,6 +14,7 @@ vertex =
}
fragment =
uniform lowp vec4 u_plateColor;
uniform lowp vec4 u_gridColor0;
uniform lowp vec4 u_gridColor1;
@ -21,10 +22,19 @@ fragment =
void main()
{
if (mod(floor(v_uvs.x / 10.0) - floor(v_uvs.y / 10.0), 2.0) < 1.0)
gl_FragColor = u_gridColor0;
else
gl_FragColor = u_gridColor1;
vec2 coord = v_uvs.xy;
// Compute anti-aliased world-space minor grid lines
vec2 minorGrid = abs(fract(coord - 0.5) - 0.5) / fwidth(coord);
float minorLine = min(minorGrid.x, minorGrid.y);
vec4 minorGridColor = mix(u_plateColor, u_gridColor1, 1.0 - min(minorLine, 1.0));
// Compute anti-aliased world-space major grid lines
vec2 majorGrid = abs(fract(coord / 10 - 0.5) - 0.5) / fwidth(coord / 10);
float majorLine = min(majorGrid.x, majorGrid.y);
frag_color = mix(minorGridColor, u_gridColor0, 1.0 - min(majorLine, 1.0));
}
vertex41core =
@ -44,23 +54,37 @@ vertex41core =
fragment41core =
#version 410
uniform lowp vec4 u_plateColor;
uniform lowp vec4 u_gridColor0;
uniform lowp vec4 u_gridColor1;
uniform lowp float u_z_bias; //Bias in the depth buffer for rendering this object (to make an object be rendered in front of or behind other objects).
in lowp vec2 v_uvs;
out vec4 frag_color;
void main()
{
if (mod(floor(v_uvs.x / 10.0) - floor(v_uvs.y / 10.0), 2.0) < 1.0)
frag_color = u_gridColor0;
else
frag_color = u_gridColor1;
vec2 coord = v_uvs.xy;
// Compute anti-aliased world-space minor grid lines
vec2 minorGrid = abs(fract(coord - 0.5) - 0.5) / fwidth(coord);
float minorLine = min(minorGrid.x, minorGrid.y);
vec4 minorGridColor = mix(u_plateColor, u_gridColor1, 1.0 - min(minorLine, 1.0));
// Compute anti-aliased world-space major grid lines
vec2 majorGrid = abs(fract(coord / 10 - 0.5) - 0.5) / fwidth(coord / 10);
float majorLine = min(majorGrid.x, majorGrid.y);
frag_color = mix(minorGridColor, u_gridColor0, 1.0 - min(majorLine, 1.0));
gl_FragDepth = gl_FragCoord.z + u_z_bias;
}
[defaults]
u_plateColor = [1.0, 1.0, 1.0, 1.0]
u_gridColor0 = [0.96, 0.96, 0.96, 1.0]
u_gridColor1 = [0.8, 0.8, 0.8, 1.0]
u_z_bias = 0.0
[bindings]
u_modelViewProjectionMatrix = model_view_projection_matrix