1 uniform sampler2D m_Alpha; 2 uniform sampler2D m_Tex1; 3 uniform sampler2D m_Tex2; 4 uniform sampler2D m_Tex3; 5 uniform float m_Tex1Scale; 6 uniform float m_Tex2Scale; 7 uniform float m_Tex3Scale; 8 9 varying vec2 texCoord; 10 11 #ifdef TRI_PLANAR_MAPPING 12 varying vec4 vVertex; 13 varying vec3 vNormal; 14 #endif 15 16 void main(void) 17 { 18 19 // get the alpha value at this 2D texture coord 20 vec4 alpha = texture2D( m_Alpha, texCoord.xy ); 21 22 #ifdef TRI_PLANAR_MAPPING 23 // tri-planar texture bending factor for this fragment's normal 24 vec3 blending = abs( vNormal ); 25 blending = (blending -0.2) * 0.7; 26 blending = normalize(max(blending, 0.00001)); // Force weights to sum to 1.0 (very important!) 27 float b = (blending.x + blending.y + blending.z); 28 blending /= vec3(b, b, b); 29 30 // texture coords 31 vec4 coords = vVertex; 32 33 vec4 col1 = texture2D( m_Tex1, coords.yz * m_Tex1Scale ); 34 vec4 col2 = texture2D( m_Tex1, coords.xz * m_Tex1Scale ); 35 vec4 col3 = texture2D( m_Tex1, coords.xy * m_Tex1Scale ); 36 // blend the results of the 3 planar projections. 37 vec4 tex1 = col1 * blending.x + col2 * blending.y + col3 * blending.z; 38 39 col1 = texture2D( m_Tex2, coords.yz * m_Tex2Scale ); 40 col2 = texture2D( m_Tex2, coords.xz * m_Tex2Scale ); 41 col3 = texture2D( m_Tex2, coords.xy * m_Tex2Scale ); 42 // blend the results of the 3 planar projections. 43 vec4 tex2 = col1 * blending.x + col2 * blending.y + col3 * blending.z; 44 45 col1 = texture2D( m_Tex3, coords.yz * m_Tex3Scale ); 46 col2 = texture2D( m_Tex3, coords.xz * m_Tex3Scale ); 47 col3 = texture2D( m_Tex3, coords.xy * m_Tex3Scale ); 48 // blend the results of the 3 planar projections. 49 vec4 tex3 = col1 * blending.x + col2 * blending.y + col3 * blending.z; 50 51 #else 52 vec4 tex1 = texture2D( m_Tex1, texCoord.xy * m_Tex1Scale ); // Tile 53 vec4 tex2 = texture2D( m_Tex2, texCoord.xy * m_Tex2Scale ); // Tile 54 vec4 tex3 = texture2D( m_Tex3, texCoord.xy * m_Tex3Scale ); // Tile 55 56 #endif 57 58 vec4 outColor = tex1 * alpha.r; // Red channel 59 outColor = mix( outColor, tex2, alpha.g ); // Green channel 60 outColor = mix( outColor, tex3, alpha.b ); // Blue channel 61 gl_FragColor = outColor; 62 } 63 64
