opengl渲染YUV的波浪百叶窗效果

接上一篇---3D融合场景demo - 邗影 - 博客园
#version 330 core
in vec2 TexCoord;
out vec4 FragColor;

uniform sampler2D yTexture;
uniform sampler2D uvTexture;
uniform float time;//new
//

void main()
{
    float blinds = 16.0;
    float stripId = floor(TexCoord.y * blinds);
    float stripFract = fract(TexCoord.y * blinds);

  
    float phase = stripId * 0.6;
    float openness = (sin(time * 1.5 + phase) + 1.0) * 0.5; // 0.0 ~ 1.0

   
    float slatWidth = 0.2 + 0.6 * openness;

   
    if (stripFract > slatWidth)
    {
        float y = texture(yTexture, TexCoord).r;
        float u = texture(uvTexture, TexCoord).r - 0.5;
        float v = texture(uvTexture, TexCoord).g - 0.5;
        float r = y + 1.402 * v;
        float g = y - 0.344136 * u - 0.714136 * v;
        float b = y + 1.772 * u;
        FragColor = vec4(r, g, b, 1.0);
        return;
    }

   
    float tilt = (1.0 - openness) * 0.04 * (mod(stripId, 2.0) * 2.0 - 1.0);
    vec2 sampleUV = TexCoord + vec2(tilt, 0.0);

    float y = texture(yTexture, sampleUV).r;
    float u = texture(uvTexture, sampleUV).r - 0.5;
    float v = texture(uvTexture, sampleUV).g - 0.5;
    float r = y + 1.402 * v;
    float g = y - 0.344136 * u - 0.714136 * v;
    float b = y + 1.772 * u;

  
    float dim = 0.5 + 0.5 * openness;
    FragColor = vec4(r * dim, g * dim, b * dim, 1.0);
}

yuvShader.setFloat("time", static_cast<float>(glfwGetTime()));

• sin(time * 1.5 + phase) 让每片叶片周期性开合
• phase = stripId * 0.6 让相邻叶片错开相位，形成波浪
• 缝隙处直接透出完整 YUV 视频
• 叶片上的视频随开合变暗/变亮，并有轻微倾斜