Citra Shader -

The primary challenge with Citra's shader system is . Because the emulator must generate modern shaders at runtime to match what the original 3DS hardware is doing, it can cause small freezes during gameplay as new shaders are cached.

vec2 texel = 1.0 / tex_size; vec3 sharp = color.rgb * 5.0; sharp -= texture(color_texture, uv + vec2(-texel.x, -texel.y)).rgb; sharp -= texture(color_texture, uv + vec2( texel.x, -texel.y)).rgb; sharp -= texture(color_texture, uv + vec2(-texel.x, texel.y)).rgb; sharp -= texture(color_texture, uv + vec2( texel.x, texel.y)).rgb; color.rgb += (color.rgb - sharp / 4.0) * 0.5; citra shader

Many early 3DS games didn’t use programmable shaders at all; they used TEV – a configurable texture combiner pipeline. Citra converts TEV states into equivalent fragment shader code dynamically. The primary challenge with Citra's shader system is

// Post-processing shader for Citra