Custom PPSSPP shaders

[bdszoke]

Thanks! That made a big difference in my understanding. My final question then is that in order to modify the shader further, to control the brightness in the second example, then would I have to do something like

float distance = dot(v_texcoord0 - 0.5, v_texcoord0 - 0.5);
distance = clamp(distance - 0.7, 0.0, 1.0);
float vignette = 1.0 + 0.7 * (distance * 3.0) + (dot(v_texcoord0 - 0.5, v_texcoord0 - 0.5) * 4.0);

with 4 being the higher brightness?

Sorry, for all the questions, I am really new to writing shaders. But I prefer to learn how to do something instead of pestering people on the board to do it for me lol.