bgfx/examples/common/nanovg/fs_nanovg_fill.sc
2014-04-26 23:50:11 -07:00

90 lines
2.3 KiB
Scala

$input v_position, v_texcoord0
#include "../common.sh"
#define EDGE_AA 1
uniform mat3 u_scissorMat;
uniform mat3 u_paintMat;
uniform vec4 u_innerCol;
uniform vec4 u_outerCol;
uniform vec4 u_scissorExtScale;
uniform vec4 u_extentRadius;
uniform vec4 u_params;
SAMPLER2D(s_tex, 0);
#define u_scissorExt (u_scissorExtScale.xy)
#define u_scissorScale (u_scissorExtScale.zw)
#define u_extent (u_extentRadius.xy)
#define u_radius (u_extentRadius.z)
#define u_feather (u_params.x)
#define u_strokeMult (u_params.y)
#define u_texType (u_params.z)
#define u_type (u_params.w)
float sdroundrect(vec2 pt, vec2 ext, float rad)
{
vec2 ext2 = ext - vec2(rad,rad);
vec2 d = abs(pt) - ext2;
return min(max(d.x, d.y), 0.0) + length(max(d, 0.0) ) - rad;
}
// Scissoring
float scissorMask(vec2 p)
{
vec2 sc = abs(mul(u_scissorMat, vec3(p, 1.0) ).xy) - u_scissorExt;
sc = vec2(0.5, 0.5) - sc * u_scissorScale;
return clamp(sc.x, 0.0, 1.0) * clamp(sc.y, 0.0, 1.0);
}
// Stroke - from [0..1] to clipped pyramid, where the slope is 1px.
float strokeMask(vec2 _texcoord)
{
#if EDGE_AA
return min(1.0, (1.0 - abs(_texcoord.x*2.0 - 1.0) )*u_strokeMult) * min(1.0, _texcoord.y);
#else
return 1.0;
#endif // EDGE_AA
}
void main()
{
vec4 result;
float scissor = scissorMask(v_position);
float strokeAlpha = strokeMask(v_texcoord0);
if (u_type == 0.0) // Gradient
{
// Calculate gradient color using box gradient
vec2 pt = mul(u_paintMat, vec3(v_position, 1.0) ).xy;
float d = clamp( (sdroundrect(pt, u_extent, u_radius) + u_feather*0.5) / u_feather, 0.0, 1.0);
vec4 color = mix(u_innerCol, u_outerCol, d);
// Combine alpha
color.w *= strokeAlpha * scissor;
result = color;
}
else if (u_type == 1.0) // Image
{
// Calculate color fron texture
vec2 pt = mul(u_paintMat, vec3(v_position, 1.0) ).xy / u_extent;
vec4 color = texture2D(s_tex, pt);
color = u_texType == 0.0 ? color : vec4(1.0, 1.0, 1.0, color.x);
// Combine alpha
color.w *= strokeAlpha * scissor;
result = color;
}
else if (u_type == 2.0) // Stencil fill
{
result = vec4(1.0, 1.0, 1.0, 1.0);
}
else if (u_type == 3.0) // Textured tris
{
vec4 color = texture2D(s_tex, v_texcoord0);
color = u_texType == 0.0 ? color : vec4(1.0, 1.0, 1.0, color.x);
color.w *= scissor;
result = color * u_innerCol;
}
gl_FragColor = result;
}