24 lines
694 B
GLSL
24 lines
694 B
GLSL
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uniform sampler2D g_Texture0; // {"hidden":true}
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uniform sampler2D g_Texture1; // {"hidden":true}
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varying vec2 v_TexCoord;
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varying vec4 v_TexCoordLeftTop;
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varying vec4 v_TexCoordRightBottom;
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void main() {
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vec2 vUv = v_TexCoord;
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vec2 vL = v_TexCoordLeftTop.xy;
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vec2 vR = v_TexCoordRightBottom.xy;
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vec2 vT = v_TexCoordLeftTop.zw;
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vec2 vB = v_TexCoordRightBottom.zw;
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float L = texSample2D(g_Texture0, vL).x;
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float R = texSample2D(g_Texture0, vR).x;
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float T = texSample2D(g_Texture0, vT).x;
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float B = texSample2D(g_Texture0, vB).x;
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vec2 velocity = texSample2D(g_Texture1, vUv).xy;
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velocity.xy -= vec2(R - L, T - B);
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gl_FragColor = vec4(velocity, 0.0, 1.0);
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}
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