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ENH: shader: add logic to avoid error when opengl version less than 3.0

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use a seperate shader for function which needs opengl 3.0 supports

Change-Id: Iff30a90211aa10ae9c4a1e36afeb331d252fb814
This commit is contained in:
lane.wei 2022-10-16 23:21:10 +08:00 • committed by Lane.Wei
parent c9c98dcee8
commit 227e1f4dc3
5 changed files with 218 additions and 38 deletions
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34
resources/shaders/gouraud.fs
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@ -1,4 +1,4 @@
#version 130
#version 110
const vec3 ZERO = vec3(0.0, 0.0, 0.0);
//BBS: add grey and orange
@ -26,29 +26,11 @@ struct SlopeDetection
mat3 volume_world_normal_matrix;
};
//BBS: add wireframe logic
varying vec3 barycentric_coordinates;
float edgeFactor(float lineWidth) {
vec3 d = fwidth(barycentric_coordinates);
vec3 a3 = smoothstep(vec3(0.0), d * lineWidth, barycentric_coordinates);
return min(min(a3.x, a3.y), a3.z);
}
vec3 wireframe(vec3 fill, vec3 stroke, float lineWidth) {
return mix(stroke, fill, edgeFactor(lineWidth));
}
vec3 getWireframeColor(vec3 fill) {
float brightness = 0.2126 * fill.r + 0.7152 * fill.g + 0.0722 * fill.b;
return (brightness > 0.75) ? vec3(0.11, 0.165, 0.208) : vec3(0.988, 0.988, 0.988);
}
uniform vec4 uniform_color;
uniform SlopeDetection slope;
//BBS: add outline_color
uniform bool is_outline;
uniform bool show_wireframe;
uniform bool offset_depth_buffer;
@ -106,17 +88,9 @@ void main()
else if (use_environment_tex)
gl_FragColor = vec4(0.45 * texture2D(environment_tex, normalize(eye_normal).xy * 0.5 + 0.5).xyz + 0.8 * color * intensity.x, alpha);
#endif
else {
//gl_FragColor = vec4(vec3(intensity.y) + color * intensity.x, alpha);
if (show_wireframe) {
vec3 wireframeColor = show_wireframe ? getWireframeColor(color) : color;
vec3 triangleColor = wireframe(color, wireframeColor, 1.0);
gl_FragColor = vec4(vec3(intensity.y) + triangleColor * intensity.x, alpha);
}
else {
gl_FragColor = vec4(vec3(intensity.y) + color * intensity.x, alpha);
}
}
else
gl_FragColor = vec4(vec3(intensity.y) + color * intensity.x, alpha);
// In the support painting gizmo and the seam painting gizmo are painted triangles rendered over the already
// rendered object. To resolved z-fighting between previously rendered object and painted triangles, values
// inside the depth buffer are offset by small epsilon for painted triangles inside those gizmos.