#type vertex
#version 320 es
precision highp float;

layout(std140, binding = 0) uniform GlobalUBO {
    mat4 uViewProjection;
    vec4 uCameraPosition;
    float uTime;
    float uDeltaTime;
    vec2 uScreenSize;
};

layout(std140, binding = 1) uniform MaterialUBO {
    vec4 uColor;
    vec4 uTintColor;
    float uOpacity;
    float uPadding[3];
};

uniform mat4 uModelMatrix;

layout(location = 0) in vec2 aPosition;
layout(location = 1) in vec2 aTexCoord;
layout(location = 2) in vec4 aColor;

out vec2 vTexCoord;
out vec4 vColor;
out vec4 vTintColor;
out float vOpacity;

void main() {
    gl_Position = uViewProjection * uModelMatrix * vec4(aPosition, 0.0, 1.0);
    vTexCoord = aTexCoord;
    vColor = aColor * uColor;
    vTintColor = uTintColor;
    vOpacity = uOpacity;
}

#type fragment
#version 320 es
precision highp float;

in vec2 vTexCoord;
in vec4 vColor;
in vec4 vTintColor;
in float vOpacity;

uniform sampler2D uTexture;

out vec4 fragColor;

void main() {
    vec4 texColor = texture(uTexture, vTexCoord);

    if (texColor.rgb == vec3(0.0) || texColor.a < 0.01) {
        texColor = vec4(1.0, 1.0, 1.0, 1.0);
    }

    fragColor = texColor * vColor * vTintColor;
    fragColor.a *= vOpacity;

    if (fragColor.a < 0.01) {
        discard;
    }
}