#version 320 es

// 全局 UBO
layout(std140, binding = 0) uniform GlobalUBO {
    mat4 viewProjection;
    vec2 screenSize;
    float time;
} uGlobal;

// 实例 UBO
layout(std140, binding = 2) uniform InstanceUBO {
    mat4 transforms[256];
} uInstances;

// 顶点属性
layout(location = 0) in vec2 aPosition;
layout(location = 1) in vec2 aTexCoord;
layout(location = 2) in vec4 aColor;

// 输出到片段着色器
out vec2 vTexCoord;
out vec4 vColor;

void main() {
    // 获取实例变换矩阵
    mat4 instanceTransform = uInstances.transforms[gl_InstanceID];
    
    // 计算最终位置
    gl_Position = uGlobal.viewProjection * instanceTransform * vec4(aPosition, 0.0, 1.0);
    
    // 传递纹理坐标和颜色
    vTexCoord = aTexCoord;
    vColor = aColor;
}