64 lines
2.2 KiB
GLSL
64 lines
2.2 KiB
GLSL
uniform sampler2D m_Alpha;
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uniform sampler2D m_Tex1;
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uniform sampler2D m_Tex2;
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uniform sampler2D m_Tex3;
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uniform float m_Tex1Scale;
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uniform float m_Tex2Scale;
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uniform float m_Tex3Scale;
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varying vec2 texCoord;
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#ifdef TRI_PLANAR_MAPPING
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varying vec4 vVertex;
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varying vec3 vNormal;
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#endif
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void main(void)
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{
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// get the alpha value at this 2D texture coord
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vec4 alpha = texture2D( m_Alpha, texCoord.xy );
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#ifdef TRI_PLANAR_MAPPING
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// tri-planar texture bending factor for this fragment's normal
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vec3 blending = abs( vNormal );
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blending = (blending -0.2) * 0.7;
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blending = normalize(max(blending, 0.00001)); // Force weights to sum to 1.0 (very important!)
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float b = (blending.x + blending.y + blending.z);
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blending /= vec3(b, b, b);
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// texture coords
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vec4 coords = vVertex;
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vec4 col1 = texture2D( m_Tex1, coords.yz * m_Tex1Scale );
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vec4 col2 = texture2D( m_Tex1, coords.xz * m_Tex1Scale );
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vec4 col3 = texture2D( m_Tex1, coords.xy * m_Tex1Scale );
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// blend the results of the 3 planar projections.
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vec4 tex1 = col1 * blending.x + col2 * blending.y + col3 * blending.z;
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col1 = texture2D( m_Tex2, coords.yz * m_Tex2Scale );
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col2 = texture2D( m_Tex2, coords.xz * m_Tex2Scale );
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col3 = texture2D( m_Tex2, coords.xy * m_Tex2Scale );
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// blend the results of the 3 planar projections.
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vec4 tex2 = col1 * blending.x + col2 * blending.y + col3 * blending.z;
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col1 = texture2D( m_Tex3, coords.yz * m_Tex3Scale );
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col2 = texture2D( m_Tex3, coords.xz * m_Tex3Scale );
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col3 = texture2D( m_Tex3, coords.xy * m_Tex3Scale );
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// blend the results of the 3 planar projections.
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vec4 tex3 = col1 * blending.x + col2 * blending.y + col3 * blending.z;
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#else
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vec4 tex1 = texture2D( m_Tex1, texCoord.xy * m_Tex1Scale ); // Tile
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vec4 tex2 = texture2D( m_Tex2, texCoord.xy * m_Tex2Scale ); // Tile
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vec4 tex3 = texture2D( m_Tex3, texCoord.xy * m_Tex3Scale ); // Tile
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#endif
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vec4 outColor = tex1 * alpha.r; // Red channel
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outColor = mix( outColor, tex2, alpha.g ); // Green channel
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outColor = mix( outColor, tex3, alpha.b ); // Blue channel
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gl_FragColor = outColor;
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}
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