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BLF: Opti: More clever sampling for blured glyphs.

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Reduce the number of sampled required for blurring by using filtered
texture samples.

This changes the result a bit but it is not noticable.
This commit is contained in:
Clément Foucault
2018-04-08 01:00:55 +02:00
parent 987c56c4b6
commit 3725d82cee
2 changed files with 34 additions and 59 deletions
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2
source/blender/blenfont/intern/blf_glyph.c
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@@ -240,7 +240,7 @@ static void blf_glyph_cache_texture(FontBLF *font, GlyphCacheBLF *gc)
glBindTexture(GL_TEXTURE_2D, (font->tex_bind_state = gc->textures[gc->texture_current]));
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, gc->p2_width, gc->p2_height, 0, GL_RED, GL_UNSIGNED_BYTE, NULL);
}

91
source/blender/gpu/shaders/gpu_shader_text_frag.glsl
View File

@@ -6,32 +6,16 @@ out vec4 fragColor;
uniform sampler2D glyph;
const vec2 offsets9[9] = vec2[9](
vec2(-1.0, -1.0), vec2( 0.0, -1.0), vec2( 1.0, -1.0),
vec2(-1.0, 0.0), vec2( 0.0, 0.0), vec2( 1.0, 0.0),
vec2(-1.0, 1.0), vec2( 0.0, 1.0), vec2( 1.0, 1.0)
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 offsets25[25] = vec2[25](
vec2(-2.0, -2.0), vec2(-1.0, -2.0), vec2( 0.0, -2.0), vec2( 1.0, -2.0), vec2( 2.0, -2.0),
vec2(-2.0, -1.0), vec2(-1.0, -1.0), vec2( 0.0, -1.0), vec2( 1.0, -1.0), vec2( 2.0, -1.0),
vec2(-2.0, 0.0), vec2(-1.0, 0.0), vec2( 0.0, 0.0), vec2( 1.0, 0.0), vec2( 2.0, 0.0),
vec2(-2.0, 1.0), vec2(-1.0, 1.0), vec2( 0.0, 1.0), vec2( 1.0, 1.0), vec2( 2.0, 1.0),
vec2(-2.0, 2.0), vec2(-1.0, 2.0), vec2( 0.0, 2.0), vec2( 1.0, 2.0), vec2( 2.0, 2.0)
);
const float weights9[9] = float[9](
1.0 / 16.0, 2.0 / 16.0, 1.0 / 16.0,
2.0 / 16.0, 4.0 / 16.0, 2.0 / 16.0,
1.0 / 16.0, 2.0 / 16.0, 1.0 / 16.0
);
const float weights25[25] = float[25](
1.0 / 60.0, 1.0 / 60.0, 2.0 / 60.0, 1.0 / 60.0, 1.0 / 60.0,
1.0 / 60.0, 3.0 / 60.0, 5.0 / 60.0, 3.0 / 60.0, 1.0 / 60.0,
2.0 / 60.0, 5.0 / 60.0, 8.0 / 60.0, 5.0 / 60.0, 2.0 / 60.0,
1.0 / 60.0, 3.0 / 60.0, 5.0 / 60.0, 3.0 / 60.0, 1.0 / 60.0,
1.0 / 60.0, 1.0 / 60.0, 2.0 / 60.0, 1.0 / 60.0, 1.0 / 60.0
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 sample_glyph_offset(texco, texel, ofs) texture(glyph, texco + ofs * texel).r
@@ -54,44 +38,35 @@ void main()
if (texCoord_rect.w > 0) {
/* 3x3 blur */
/* Manual unroll for perf. (stupid glsl compiler) */
fragColor.a += sample_glyph_offset(texco, texel, offsets9[0]) * weights9[0];
fragColor.a += sample_glyph_offset(texco, texel, offsets9[1]) * weights9[1];
fragColor.a += sample_glyph_offset(texco, texel, offsets9[2]) * weights9[2];
fragColor.a += sample_glyph_offset(texco, texel, offsets9[3]) * weights9[3];
fragColor.a += sample_glyph_offset(texco, texel, offsets9[4]) * weights9[4];
fragColor.a += sample_glyph_offset(texco, texel, offsets9[5]) * weights9[5];
fragColor.a += sample_glyph_offset(texco, texel, offsets9[6]) * weights9[6];
fragColor.a += sample_glyph_offset(texco, texel, offsets9[7]) * weights9[7];
fragColor.a += sample_glyph_offset(texco, texel, offsets9[8]) * weights9[8];
fragColor.a += sample_glyph_offset(texco, texel, offsets4[0]);
fragColor.a += sample_glyph_offset(texco, texel, offsets4[1]);
fragColor.a += sample_glyph_offset(texco, texel, offsets4[2]);
fragColor.a += sample_glyph_offset(texco, texel, offsets4[3]);
fragColor.a *= (1.0 / 4.0);
}
else {
/* 5x5 blur */
/* Manual unroll for perf. (stupid glsl compiler) */
fragColor.a += sample_glyph_offset(texco, texel, offsets25[ 0]) * weights25[ 0];
fragColor.a += sample_glyph_offset(texco, texel, offsets25[ 1]) * weights25[ 1];
fragColor.a += sample_glyph_offset(texco, texel, offsets25[ 2]) * weights25[ 2];
fragColor.a += sample_glyph_offset(texco, texel, offsets25[ 3]) * weights25[ 3];
fragColor.a += sample_glyph_offset(texco, texel, offsets25[ 4]) * weights25[ 4];
fragColor.a += sample_glyph_offset(texco, texel, offsets25[ 5]) * weights25[ 5];
fragColor.a += sample_glyph_offset(texco, texel, offsets25[ 6]) * weights25[ 6];
fragColor.a += sample_glyph_offset(texco, texel, offsets25[ 7]) * weights25[ 7];
fragColor.a += sample_glyph_offset(texco, texel, offsets25[ 8]) * weights25[ 8];
fragColor.a += sample_glyph_offset(texco, texel, offsets25[ 9]) * weights25[ 9];
fragColor.a += sample_glyph_offset(texco, texel, offsets25[10]) * weights25[10];
fragColor.a += sample_glyph_offset(texco, texel, offsets25[11]) * weights25[11];
fragColor.a += sample_glyph_offset(texco, texel, offsets25[12]) * weights25[12];
fragColor.a += sample_glyph_offset(texco, texel, offsets25[13]) * weights25[13];
fragColor.a += sample_glyph_offset(texco, texel, offsets25[14]) * weights25[14];
fragColor.a += sample_glyph_offset(texco, texel, offsets25[15]) * weights25[15];
fragColor.a += sample_glyph_offset(texco, texel, offsets25[16]) * weights25[16];
fragColor.a += sample_glyph_offset(texco, texel, offsets25[17]) * weights25[17];
fragColor.a += sample_glyph_offset(texco, texel, offsets25[18]) * weights25[18];
fragColor.a += sample_glyph_offset(texco, texel, offsets25[19]) * weights25[19];
fragColor.a += sample_glyph_offset(texco, texel, offsets25[20]) * weights25[20];
fragColor.a += sample_glyph_offset(texco, texel, offsets25[21]) * weights25[21];
fragColor.a += sample_glyph_offset(texco, texel, offsets25[22]) * weights25[22];
fragColor.a += sample_glyph_offset(texco, texel, offsets25[23]) * weights25[23];
fragColor.a += sample_glyph_offset(texco, texel, offsets25[24]) * weights25[24];
fragColor.a += sample_glyph_offset(texco, texel, offsets16[ 0]);
fragColor.a += sample_glyph_offset(texco, texel, offsets16[ 1]);
fragColor.a += sample_glyph_offset(texco, texel, offsets16[ 2]);
fragColor.a += sample_glyph_offset(texco, texel, offsets16[ 3]);
fragColor.a += sample_glyph_offset(texco, texel, offsets16[ 4]);
fragColor.a += sample_glyph_offset(texco, texel, offsets16[ 5]) * 2.0;
fragColor.a += sample_glyph_offset(texco, texel, offsets16[ 6]) * 2.0;
fragColor.a += sample_glyph_offset(texco, texel, offsets16[ 7]);
fragColor.a += sample_glyph_offset(texco, texel, offsets16[ 8]);
fragColor.a += sample_glyph_offset(texco, texel, offsets16[ 9]) * 2.0;
fragColor.a += sample_glyph_offset(texco, texel, offsets16[10]) * 2.0;
fragColor.a += sample_glyph_offset(texco, texel, offsets16[11]);
fragColor.a += sample_glyph_offset(texco, texel, offsets16[12]);
fragColor.a += sample_glyph_offset(texco, texel, offsets16[13]);
fragColor.a += sample_glyph_offset(texco, texel, offsets16[14]);
fragColor.a += sample_glyph_offset(texco, texel, offsets16[15]);
fragColor.a *= (1.0 / 20.0);
}
}