// -*-C++-*- // Shader that uses OpenGL state values to do per-pixel lighting // // The only light used is gl_LightSource[0], which is assumed to be // directional. // // Diffuse colors come from the gl_Color, ambient from the material. This is // equivalent to osg::Material::DIFFUSE. #version 120 #extension GL_EXT_draw_instanced : enable #define MODE_OFF 0 #define MODE_DIFFUSE 1 #define MODE_AMBIENT_AND_DIFFUSE 2 attribute vec3 instancePosition; // (x,y,z) attribute vec3 instanceScaleRotate; // (width, depth, height) attribute vec3 rotPitchTex0x; // (rotation, pitch height, texture x offset) attribute vec3 tex0yTex1xTex1y; // (texture y offset, texture x gain, texture y gain) // The constant term of the lighting equation that doesn't depend on // the surface normal is passed in gl_{Front,Back}Color. The alpha // component is set to 1 for front, 0 for back in order to work around // bugs with gl_FrontFacing in the fragment shader. varying vec4 diffuse_term; varying vec3 normal; uniform int colorMode; ////fog "include"//////// //uniform int fogType; // //void fog_Func(int type); ///////////////////////// void main() { // Determine the rotation for the building. float sr = sin(6.28 * rotPitchTex0x.x); float cr = cos(6.28 * rotPitchTex0x.x); // Adjust pitch of roof to the correct height. // The top roof vertices are the only ones that have fractional z values (1.5), // so we can use this to identify them and scale up any pitched roof vertex to // the correct pitch (rotPitchTex0x.y * 2.0 because of the fractional z value), // then scale down by the building height (instanceScaleRotate.z) because // immediately afterwards we will scale UP the vertex to the correct scale. vec3 position = gl_Vertex.xyz; position.z = position.z + fract(position.z) * 2.0 * rotPitchTex0x.y / instanceScaleRotate.z - fract(position.z); position = position * instanceScaleRotate.xyz; // Rotation of the building and movement into position position.xy = vec2(dot(position.xy, vec2(cr, sr)), dot(position.xy, vec2(-sr, cr))); position = position + instancePosition.xyz; gl_Position = gl_ModelViewProjectionMatrix * vec4(position,1.0); // Texture coordinates are stored as tex0 and tex1 across two attributes. // tex0 contains the bottom leftmost point, and tex1 contains (w,h). gl_TexCoord[0].x = sign(gl_MultiTexCoord0.x) * rotPitchTex0x.z + gl_MultiTexCoord0.x * tex0yTex1xTex1y.y; gl_TexCoord[0].y = tex0yTex1xTex1y.x + gl_MultiTexCoord0.y * tex0yTex1xTex1y.z; // Rotate the normal. normal = gl_Normal; // The roof pieces have a normal of (+/-0.7, 0.0, 0.7) // If the roof is flat, then we need to change it to (0,0,1). // First term evaluates for normals without a +z component (all except roof) // Second term evaluates for roof normals with a pitch // Third term evaluates for flat roofs normal = step(0.5, 1.0 - normal.z) * normal + step(0.5, normal.z) * clamp(rotPitchTex0x.y, 0.0, 1.0) * normal + step(0.5, normal.z) * (1.0 - clamp(rotPitchTex0x.y, 0.0, 1.0)) * vec3(0,0,1); // Rotate the normal as per the building. normal.xy = vec2(dot(normal.xy, vec2(cr, sr)), dot(normal.xy, vec2(-sr, cr))); normal = gl_NormalMatrix * normal; vec4 ambient_color, diffuse_color; if (colorMode == MODE_DIFFUSE) { diffuse_color = vec4(1.0,1.0,1.0,1.0); ambient_color = gl_FrontMaterial.ambient; } else if (colorMode == MODE_AMBIENT_AND_DIFFUSE) { diffuse_color = vec4(1.0,1.0,1.0,1.0); ambient_color = vec4(1.0,1.0,1.0,1.0); } else { diffuse_color = gl_FrontMaterial.diffuse; ambient_color = gl_FrontMaterial.ambient; } diffuse_term = diffuse_color * gl_LightSource[0].diffuse; vec4 constant_term = gl_FrontMaterial.emission + ambient_color * (gl_LightModel.ambient + gl_LightSource[0].ambient); // Super hack: if diffuse material alpha is less than 1, assume a // transparency animation is at work if (gl_FrontMaterial.diffuse.a < 1.0) diffuse_term.a = gl_FrontMaterial.diffuse.a; else diffuse_term.a = 1.0; // Another hack for supporting two-sided lighting without using // gl_FrontFacing in the fragment shader. gl_FrontColor.rgb = constant_term.rgb; gl_FrontColor.a = 1.0; gl_BackColor.rgb = constant_term.rgb; gl_BackColor.a = 0.0; //fogCoord = abs(ecPosition.z / ecPosition.w); //fog_Func(fogType); }