1 files changed, 74 insertions, 0 deletions
diff --git a/source/blender/gpu/shaders/gpu_shader_text_frag.glsl b/source/blender/gpu/shaders/gpu_shader_text_frag.glsl
new file mode 100644
index 00000000000..fbfa4cfcc9d
--- /dev/null
+++ b/source/blender/gpu/shaders/gpu_shader_text_frag.glsl
@@ -0,0 +1,74 @@
+
+flat in vec4 color_flat;
+flat in vec4 texCoord_rect;
+noperspective in vec2 texCoord_interp;
+out vec4 fragColor;
+
+uniform sampler2D glyph;
+
+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 sample_glyph_offset(texco, texel, ofs) texture(glyph, texco + ofs * texel).r
+
+void main()
+{
+	// input color replaces texture color
+	fragColor.rgb = color_flat.rgb;
+
+	vec2 texel = 1.0 / vec2(textureSize(glyph, 0));
+	vec2 texco = mix(abs(texCoord_rect.xy), abs(texCoord_rect.zw), texCoord_interp);
+
+	// modulate input alpha & texture alpha
+	if (texCoord_rect.x > 0) {
+		fragColor.a = texture(glyph, texco).r;
+	}
+	else {
+		fragColor.a = 0.0;
+
+		if (texCoord_rect.w > 0) {
+			/* 3x3 blur */
+			/* Manual unroll for perf. (stupid glsl compiler) */
+			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, 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);
+		}
+	}
+
+	fragColor.a *= color_flat.a;
+}