101 lines
3.9 KiB
GLSL
101 lines
3.9 KiB
GLSL
#version 330 core
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#extension GL_EXT_draw_instanced : enable
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layout(location = 0) in vec4 pos;
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layout(location = 1) in vec3 normal;
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layout(location = 2) in vec4 vertex_color;
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layout(location = 3) in vec4 multitexcoord0;
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layout(location = 6) in vec3 instancePosition; // (x,y,z)
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layout(location = 7) in vec3 instanceScale ; // (width, depth, height)
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layout(location = 10) in vec3 attrib1; // Generic packed attributes
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layout(location = 11) in vec3 attrib2;
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out VS_OUT {
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vec2 texcoord;
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vec3 vertex_normal;
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vec3 view_vector;
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} vs_out;
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uniform mat4 osg_ModelViewMatrix;
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uniform mat4 osg_ModelViewProjectionMatrix;
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uniform mat3 osg_NormalMatrix;
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const float c_precision = 128.0;
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const float c_precisionp1 = c_precision + 1.0;
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vec3 float2vec(float value)
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{
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vec3 val;
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val.x = mod(value, c_precisionp1) / c_precision;
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val.y = mod(floor(value / c_precisionp1), c_precisionp1) / c_precision;
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val.z = floor(value / (c_precisionp1 * c_precisionp1)) / c_precision;
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return val;
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}
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void main()
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{
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// Unpack generic attributes
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vec3 attr1 = float2vec(attrib1.x);
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vec3 attr2 = float2vec(attrib1.z);
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vec3 attr3 = float2vec(attrib2.x);
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// Determine the rotation for the building.
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float sr = sin(6.28 * attr1.x);
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float cr = cos(6.28 * attr1.x);
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vec3 position = pos.xyz;
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// Adjust the very top of the roof to match the rooftop scaling. This shapes
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// the rooftop - gambled, gabled etc. These vertices are identified by
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// vertex_color.z
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position.x = (1.0 - vertex_color.z) * position.x + vertex_color.z
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* ((position.x + 0.5) * attr3.z - 0.5);
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position.y = (1.0 - vertex_color.z) * position.y + vertex_color.z
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* (position.y * attrib2.y );
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// Adjust pitch of roof to the correct height. These vertices are identified by gl_Color.z
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// Scale down by the building height (instanceScale.z) because
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// immediately afterwards we will scale UP the vertex to the correct scale.
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position.z = position.z + vertex_color.z * attrib1.y / instanceScale.z;
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position = position * instanceScale.xyz;
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// Rotation of the building and movement into position
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position.xy = vec2(dot(position.xy, vec2(cr, sr)), dot(position.xy, vec2(-sr, cr)));
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position = position + instancePosition.xyz;
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gl_Position = osg_ModelViewProjectionMatrix * vec4(position, 1.0);
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// Texture coordinates are stored as:
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// - a separate offset (x0, y0) for the wall (wtex0x, wtex0y),
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// and roof (rtex0x, rtex0y)
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// - a semi-shared (x1, y1) so that the front and side of the building can
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// have different texture mappings
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//
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// The vertex color value selects between them:
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// gl_Color.x=1 indicates front/back walls
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// gl_Color.y=1 indicates roof
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// gl_Color.z=1 indicates top roof vertexs (used above)
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// gl_Color.a=1 indicates sides
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// Finally, the roof texture is on the right of the texture sheet
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float wtex0x = attr1.y; // Front/Side texture X0
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float wtex0y = attr1.z; // Front/Side texture Y0
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float rtex0x = attr2.z; // Roof texture X0
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float rtex0y = attr3.x; // Roof texture Y0
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float wtex1x = attr2.x; // Front/Roof texture X1
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float stex1x = attr3.y; // Side texture X1
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float wtex1y = attr2.y; // Front/Roof/Side texture Y1
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vec2 tex0 = vec2(sign(multitexcoord0.x) * (vertex_color.x*wtex0x + vertex_color.y*rtex0x + vertex_color.a*wtex0x),
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vertex_color.x*wtex0y + vertex_color.y*rtex0y + vertex_color.a*wtex0y);
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vec2 tex1 = vec2(vertex_color.x*wtex1x + vertex_color.y*wtex1x + vertex_color.a*stex1x,
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wtex1y);
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vs_out.texcoord.x = tex0.x + multitexcoord0.x * tex1.x;
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vs_out.texcoord.y = tex0.y + multitexcoord0.y * tex1.y;
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// Rotate the normal.
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vec3 N = normal;
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N.xy = vec2(dot(N.xy, vec2(cr, sr)), dot(N.xy, vec2(-sr, cr)));
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vs_out.vertex_normal = osg_NormalMatrix * N;
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vs_out.view_vector = (osg_ModelViewMatrix * vec4(position, 1.0)).xyz;
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}
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