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Fix star point smoothing... sort of

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This commit is contained in:
Bradley Austin Davis 2015-08-04 15:06:18 -07:00
parent 59b69be251
commit 2221c839c3
2 changed files with 24 additions and 5 deletions
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18
libraries/render-utils/src/stars.slf
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@ -11,8 +11,24 @@
// //
in vec4 varColor; in vec4 varColor;
in float varSize;
out vec4 outFragColor; out vec4 outFragColor;
const float EDGE_SIZE = 0.25;
const float ALPHA_BOUNDARY = 1.0 - EDGE_SIZE;
void main(void) { void main(void) {
outFragColor = varColor; //vec4(varColor, 1.0); vec2 coord = gl_PointCoord * vec2(2.0) - vec2(1.0);
coord = coord * coord;
float l = coord.x + coord.y;
if (l > 1.0) {
discard;
}
outFragColor = varColor;
if (l >= ALPHA_BOUNDARY) {
outFragColor.a = smoothstep(1.0, ALPHA_BOUNDARY, l);
}
} }

11
libraries/render-utils/src/stars.slv
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@ -18,9 +18,12 @@
<$declareStandardTransform()$> <$declareStandardTransform()$>
out vec3 varPosition; // TODO we need to get the viewport resolution and FOV passed to us so we can modify the point size
out vec4 varColor; // and effectively producing a points that take up a constant angular size regardless of the display resolution
// or projection matrix
out vec4 varColor;
out float varSize;
void main(void) { void main(void) {
varColor = inColor.rgba; varColor = inColor.rgba;
@ -29,6 +32,6 @@ void main(void) {
TransformCamera cam = getTransformCamera(); TransformCamera cam = getTransformCamera();
TransformObject obj = getTransformObject(); TransformObject obj = getTransformObject();
<$transformModelToClipPos(cam, obj, inPosition, gl_Position)$> <$transformModelToClipPos(cam, obj, inPosition, gl_Position)$>
varPosition = inPosition.xyz; varSize = inColor.a;
gl_PointSize = inColor.a; gl_PointSize = varSize;
} }