Bam

gource/data/shaders/text.frag

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+uniform sampler2D tex;
+uniform float shadow_strength;
+uniform float texel_size;
+
+void main(void)
+{
+    float colour_alpha = texture2D(tex,gl_TexCoord[0].xy).w;
+    float shadow_alpha = texture2D(tex,gl_TexCoord[0].xy - vec2(texel_size)).w * shadow_strength;
+
+    float combined_alpha = 1.0 - (1.0-shadow_alpha)*(1.0-colour_alpha);
+
+    if(combined_alpha > 0.0) colour_alpha /= combined_alpha;
+
+    gl_FragColor = gl_Color * vec4(vec3(colour_alpha), combined_alpha);
+}