opengl實現PS中部分圖像處理效果-正片疊底、逆正片疊底、顏色加深、減淡

效果圖3d 正片疊底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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