opengl实现PS中部分图像处理效果-正片叠底、逆正片叠底、颜色加深、减淡

效果图3d 正片叠底shadercode varying vec2 V_Texcoord; uniform sampler2D U_BaseTexture; uniform sampler2D U_BlendTexture; void main() { vec4 blendColor=texture2D(U_BlendTexture,V_Texcoord); vec4 baseColor=

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