74 lines
1.9 KiB
GLSL
74 lines
1.9 KiB
GLSL
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#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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// 材质 UBO (binding = 1) - 每批次更新
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layout(std140, binding = 1) uniform MaterialUBO {
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vec4 uColor;
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vec4 uTintColor;
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float uOpacity;
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float uPadding[3]; // std140 对齐填充
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};
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// 顶点属性 (每个顶点)
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layout(location = 0) in vec2 aPosition;
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layout(location = 1) in vec2 aTexCoord;
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layout(location = 2) in vec4 aColor;
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// 实例属性 (每个实例) - 使用 location 3-6
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layout(location = 3) in vec2 iPosition; // 实例位置
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layout(location = 4) in float iRotation; // 实例旋转
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layout(location = 5) in vec2 iScale; // 实例缩放
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layout(location = 6) in vec4 iColor; // 实例颜色
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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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out vec4 vTintColor;
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out float vOpacity;
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/**
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* @brief 从旋转角度构建2D变换矩阵
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* @param angle 旋转角度（弧度）
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* @return 2x2旋转矩阵
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*/
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mat2 rotate2D(float angle) {
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float c = cos(angle);
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float s = sin(angle);
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return mat2(c, -s, s, c);
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}
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/**
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* @brief 顶点着色器入口
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*
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* 计算顶点在裁剪空间中的位置，
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* 应用实例的变换（位置、旋转、缩放），
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* 并传递纹理坐标和颜色到片段着色器
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*/
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void main() {
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// 应用实例缩放和旋转
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vec2 localPos = rotate2D(iRotation) * (aPosition * iScale);
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// 应用实例位置偏移
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vec2 worldPos = localPos + iPosition;
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// 变换到裁剪空间
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gl_Position = uViewProjection * vec4(worldPos, 0.0, 1.0);
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vTexCoord = aTexCoord;
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// 混合顶点颜色、实例颜色和材质颜色
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vColor = aColor * iColor * uColor;
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vTintColor = uTintColor;
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vOpacity = uOpacity;
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}
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