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#pragma BLENDER_REQUIRE(gpu_shader_colorspace_lib.glsl)
#ifndef USE_GPU_SHADER_CREATE_INFO
flat in vec4 color_flat;
noperspective in vec2 texCoord_interp;
flat in int glyph_offset;
flat in ivec2 glyph_dim;
flat in int interp_size;
out vec4 fragColor;
uniform sampler2D glyph;
#endif
const vec2 offsets4[4] = vec2[4](
vec2(-0.5, 0.5), vec2(0.5, 0.5), vec2(-0.5, -0.5), vec2(-0.5, -0.5));
const vec2 offsets16[16] = vec2[16](vec2(-1.5, 1.5),
vec2(-0.5, 1.5),
vec2(0.5, 1.5),
vec2(1.5, 1.5),
vec2(-1.5, 0.5),
vec2(-0.5, 0.5),
vec2(0.5, 0.5),
vec2(1.5, 0.5),
vec2(-1.5, -0.5),
vec2(-0.5, -0.5),
vec2(0.5, -0.5),
vec2(1.5, -0.5),
vec2(-1.5, -1.5),
vec2(-0.5, -1.5),
vec2(0.5, -1.5),
vec2(1.5, -1.5));
//#define GPU_NEAREST
#define sample_glyph_offset(texel, ofs) \
texture_1D_custom_bilinear_filter(texCoord_interp + ofs * texel)
float texel_fetch(int index)
{
int size_x = textureSize(glyph, 0).r;
if (index >= size_x) {
return texelFetch(glyph, ivec2(index % size_x, index / size_x), 0).r;
}
return texelFetch(glyph, ivec2(index, 0), 0).r;
}
bool is_inside_box(ivec2 v)
{
return all(greaterThanEqual(v, ivec2(0))) && all(lessThan(v, glyph_dim));
}
float texture_1D_custom_bilinear_filter(vec2 uv)
{
vec2 texel_2d = uv * vec2(glyph_dim) + vec2(0.5);
ivec2 texel_2d_near = ivec2(texel_2d) - 1;
int frag_offset = glyph_offset + texel_2d_near.y * glyph_dim.x + texel_2d_near.x;
float tl = 0.0;
if (is_inside_box(texel_2d_near)) {
tl = texel_fetch(frag_offset);
}
#ifdef GPU_NEAREST
return tl;
#else // GPU_LINEAR
int offset_x = 1;
int offset_y = glyph_dim.x;
float tr = 0.0;
float bl = 0.0;
float br = 0.0;
if (is_inside_box(texel_2d_near + ivec2(1, 0))) {
tr = texel_fetch(frag_offset + offset_x);
}
if (is_inside_box(texel_2d_near + ivec2(0, 1))) {
bl = texel_fetch(frag_offset + offset_y);
}
if (is_inside_box(texel_2d_near + ivec2(1, 1))) {
br = texel_fetch(frag_offset + offset_x + offset_y);
}
vec2 f = fract(texel_2d);
float tA = mix(tl, tr, f.x);
float tB = mix(bl, br, f.x);
return mix(tA, tB, f.y);
#endif
}
void main()
{
// input color replaces texture color
fragColor.rgb = color_flat.rgb;
// modulate input alpha & texture alpha
if (interp_size == 0) {
fragColor.a = texture_1D_custom_bilinear_filter(texCoord_interp);
}
else {
vec2 texel = 1.0 / vec2(glyph_dim);
fragColor.a = 0.0;
if (interp_size == 1) {
/* 3x3 blur */
/* Manual unroll for perf. (stupid glsl compiler) */
fragColor.a += sample_glyph_offset(texel, offsets4[0]);
fragColor.a += sample_glyph_offset(texel, offsets4[1]);
fragColor.a += sample_glyph_offset(texel, offsets4[2]);
fragColor.a += sample_glyph_offset(texel, offsets4[3]);
fragColor.a *= (1.0 / 4.0);
}
else {
/* 5x5 blur */
/* Manual unroll for perf. (stupid glsl compiler) */
fragColor.a += sample_glyph_offset(texel, offsets16[0]);
fragColor.a += sample_glyph_offset(texel, offsets16[1]);
fragColor.a += sample_glyph_offset(texel, offsets16[2]);
fragColor.a += sample_glyph_offset(texel, offsets16[3]);
fragColor.a += sample_glyph_offset(texel, offsets16[4]);
fragColor.a += sample_glyph_offset(texel, offsets16[5]) * 2.0;
fragColor.a += sample_glyph_offset(texel, offsets16[6]) * 2.0;
fragColor.a += sample_glyph_offset(texel, offsets16[7]);
fragColor.a += sample_glyph_offset(texel, offsets16[8]);
fragColor.a += sample_glyph_offset(texel, offsets16[9]) * 2.0;
fragColor.a += sample_glyph_offset(texel, offsets16[10]) * 2.0;
fragColor.a += sample_glyph_offset(texel, offsets16[11]);
fragColor.a += sample_glyph_offset(texel, offsets16[12]);
fragColor.a += sample_glyph_offset(texel, offsets16[13]);
fragColor.a += sample_glyph_offset(texel, offsets16[14]);
fragColor.a += sample_glyph_offset(texel, offsets16[15]);
fragColor.a *= (1.0 / 20.0);
}
}
fragColor.a *= color_flat.a;
fragColor = blender_srgb_to_framebuffer_space(fragColor);
}
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