Dual Source Blending?

[peterdecker1337420-tech]

This is a thing in directx, vulkan and opengl docs and i think metal too, but it think its not possible currently with SDL3, were missing SRC1_ALPHA and so on.

[flibitijibibo]

Appears to be another case of "it's supported everywhere except Android," however this wouldn't be as invasive to add as other features and could be disabled with a property.

Do you have a prototype or example program, usage sample, etc?

[peterdecker1337420-tech]

it can be used to do subpixel font rendering:

#version 330 core

uniform sampler2D tCharTex;
uniform vec4 vCharColor;

smooth in vec2 vTexXY;

layout (location = 0, index = 0) out vec4 vFragColor;
layout (location = 0, index = 1) out vec4 vFragBlend;

void main() {
	vFragColor = vec4(vCharColor.rgb, 1.0);
	vFragBlend = texture(tCharTex, vTexXY) * vCharColor.aaaa;
}

[slouken]

@flibitijibibo, I assigned this to you, assuming it's something we want for 3.4. Feel free to bump it out to 3.6 or close if not.