59 lines
1.7 KiB
GLSL
59 lines
1.7 KiB
GLSL
#version 320 es
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precision highp float;
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// 全局 UBO (binding = 0) - 每帧更新一次
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layout(std140, binding = 0) uniform GlobalUBO {
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mat4 uViewProjection;
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vec4 uCameraPosition;
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float uTime;
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float uDeltaTime;
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vec2 uScreenSize;
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};
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// 顶点属性
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layout(location = 0) in vec2 aPosition; // 基础顶点位置
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layout(location = 1) in vec2 aTexCoord; // 基础 UV
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layout(location = 2) in vec4 aColor; // 基础颜色
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// 实例属性 (每个实例)
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layout(location = 3) in vec2 aInstancePos; // 实例位置偏移
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layout(location = 4) in float aInstanceRot; // 实例旋转
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layout(location = 5) in vec2 aInstanceScale; // 实例缩放
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layout(location = 6) in vec4 aInstanceColor; // 实例颜色
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layout(location = 7) in vec4 aInstanceUV; // 实例 UV 区域
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// 输出到片段着色器
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out vec2 vTexCoord;
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out vec4 vColor;
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/**
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* @brief 顶点着色器入口（实例化版本）
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*
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* 计算顶点在裁剪空间中的位置，应用实例的变换
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*/
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void main() {
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// 构建旋转矩阵
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float cosRot = cos(aInstanceRot);
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float sinRot = sin(aInstanceRot);
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mat2 rotation = mat2(
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cosRot, -sinRot,
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sinRot, cosRot
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);
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// 应用缩放和旋转
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vec2 scaledPos = aPosition * aInstanceScale;
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vec2 rotatedPos = rotation * scaledPos;
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// 应用实例位置偏移
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vec2 worldPos = rotatedPos + aInstancePos;
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// 计算裁剪空间位置
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gl_Position = uViewProjection * vec4(worldPos, 0.0, 1.0);
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// 计算 UV 坐标（应用实例 UV 区域）
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vTexCoord = aTexCoord * aInstanceUV.zw + aInstanceUV.xy;
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// 混合顶点颜色和实例颜色
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vColor = aColor * aInstanceColor;
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}
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