cocos2d-x用shader来实现阴影

来源：互联网发布：血腥知乎编辑：程序博客网时间：2024/05/05 01:10

不废话,直接上代码,在cocos2d-x 3.3rc0中使用,通过.

cocos2d-X在Sprite上使用shader

auto sprite = Sprite::create("test2.png");sprite->setPosition(origin.x + visibleSize.width/2, origin.y + visibleSize.height /2 );auto shader_program = GLProgram::createWithFilenames("shadow.vsh", "shadow.fsh");shader_program->use();shader_program->setUniformsForBuiltins();sprite->setGLProgram(shader_program);this->addChild(sprite);

shadow.vsh

attribute vec4 a_position;attribute vec2 a_texCoord;varying vec2 v_texCoord;void main(){gl_Position = CC_PMatrix * a_position;v_texCoord = a_texCoord;}

shadow.fsh

varying vec2 v_texCoord;vec4 composite(vec4 over, vec4 under){return over + (1.0 - over.a)*under;}void main(){vec2 shadowOffset = vec2(0.03, 0.03);vec4 textureColor = texture2D(CC_Texture0, v_texCoord + shadowOffset);float shadowMask = texture2D(CC_Texture0, v_texCoord ).a;const float shadowOpacity = 0.5;vec4 shadowColor = vec4(0,0,0,shadowMask *shadowOpacity);gl_FragColor = composite(textureColor, shadowColor);}

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