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First pass at implementing all effects

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Some of the math is wrong but I believe all the structure is now in place.
This commit is contained in:
Christopher Willis-Ford 2016-05-19 15:46:37 -07:00
parent 8b461e0651
commit 41d3d6f6ba
1 changed files with 35 additions and 3 deletions
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38
src/shaders/sprite.frag
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@ -23,9 +23,11 @@ uniform float u_ghost;
#endif
uniform sampler2D u_skin;
#define u_pixelate_half vec2(0.5,0.5) // TODO
varying vec2 v_texCoord;
#if defined(ENABLE_color) || defined(ENABLE_brightness)
vec3 convertRGB2HSV(vec3 rgb)
{
float maxRGB = max(max(rgb.r, rgb.g), rgb.b);
@ -88,14 +90,24 @@ vec3 convertHSV2RGB(vec3 hsv)
return rgb;
}
#endif // defined(ENABLE_color) || defined(ENABLE_brightness)
const vec2 kCenter = vec2(0.5, 0.5);
void main()
{
vec2 texcoord0 = v_texCoord;
#ifdef ENABLE_mosaic
texcoord0 = fract(u_mosaic * texcoord0);
#endif // ENABLE_mosaic
#ifdef ENABLE_pixelate
texcoord0 = floor(texcoord0 / u_pixelate) * u_pixelate + u_pixelate_half;
#endif // ENABLE_pixelate
#ifdef ENABLE_whirl
{
const vec2 kCenter = vec2(0.5, 0.5);
const float kRadius = 0.5;
vec2 offset = texcoord0 - kCenter;
float offsetMagnitude = length(offset);
@ -117,10 +129,22 @@ void main()
}
#endif // ENABLE_whirl
#ifdef ENABLE_fisheye
{
vec2 vec = (texcoord0 - kCenter) / kCenter;
float r = pow(length(vec), u_fisheye);
float angle = atan(vec.y, vec.x);
// TODO: tweak this algorithm such that texture coordinates don't depend on conditionals.
// see: https://www.opengl.org/wiki/Sampler_%28GLSL%29#Non-uniform_flow_control
if (r <= 1.0)
{
texcoord0 = kCenter + r * vec2(cos(angle), sin(angle)) * kCenter;
}
}
#endif // ENABLE_fisheye
gl_FragColor = texture2D(u_skin, texcoord0);
// TODO: See if we can/should use actual alpha test.
// Does bgfx offer a way to set u_alphaRef? Would that help?
if (gl_FragColor.a == 0.0)
{
discard;
@ -142,7 +166,15 @@ void main()
}
#endif // ENABLE_color
#ifdef ENABLE_brightness
hsv.b = clamp(hsv.b + u_brightness, 0.0, 1.0);
#endif // ENABLE_brightness
gl_FragColor.rgb = convertHSV2RGB(hsv);
}
#endif // defined(ENABLE_color) || defined(ENABLE_brightness)
#ifdef ENABLE_ghost
gl_FragColor.a *= u_ghost;
#endif // ENABLE_ghost
}