ggez 0.9.3

A lightweight game framework for making 2D games with minimum friction, inspired by Love2D.
Documentation 
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struct VertexOutput {
    @builtin(position) position: vec4<f32>,
    @location(0) uv: vec2<f32>,
    @location(1) color: vec4<f32>,
}

struct Uniforms {
    transform: mat4x4<f32>,
    color: vec4<f32>,
    scale: vec2<f32>,
}

struct DrawParam {
    color: vec4<f32>,
    src_rect: vec4<f32>,
    transform: mat4x4<f32>,
}

struct InstanceArray {
    instances: array<DrawParam>,
}

@group(0) @binding(0)
var<uniform> uniforms: Uniforms;

@group(1) @binding(0)
var t: texture_2d<f32>;

@group(1) @binding(1)
var s: sampler;

@group(2) @binding(0)
var<storage, read> instances: InstanceArray;

@vertex
fn vs_main(
    @builtin(instance_index) in_instance_index: u32,
    @location(0) position: vec2<f32>,
    @location(1) uv: vec2<f32>,
    @location(2) color: vec4<f32>,
) -> VertexOutput {
    var index = in_instance_index;
    var instance = instances.instances[index];

    var scale_x = select(1.0, uniforms.scale.x * (instance.src_rect.z - instance.src_rect.x), uniforms.scale.x > 0.0);
    var scale_y = select(1.0, uniforms.scale.y * (instance.src_rect.w - instance.src_rect.y), uniforms.scale.x > 0.0);
    var scale_mat = mat4x4<f32>(
        scale_x,
        0.0,
        0.0,
        0.0,
        0.0,
        scale_y,
        0.0,
        0.0,
        0.0,
        0.0,
        1.0,
        0.0,
        0.0,
        0.0,
        0.0,
        1.0
    );

    var out: VertexOutput;
    out.position = uniforms.transform * instance.transform * scale_mat * vec4<f32>(position, 0.0, 1.0);
    out.uv = mix(instance.src_rect.xy, instance.src_rect.zw, uv);
    out.color = uniforms.color * instance.color * color;
    return out;
}

@fragment
fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
    return in.color * textureSample(t, s, in.uv);
}