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https://github.com/PixarAnimationStudios/OpenSubdiv
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New text:
Copyright 2013 Pixar
Licensed under the Apache License, Version 2.0 (the "Apache License")
with the following modification; you may not use this file except in
compliance with the Apache License and the following modification to it:
Section 6. Trademarks. is deleted and replaced with:
6. Trademarks. This License does not grant permission to use the trade
names, trademarks, service marks, or product names of the Licensor
and its affiliates, except as required to comply with Section 4(c) of
the License and to reproduce the content of the NOTICE file.
You may obtain a copy of the Apache License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the Apache License with the above modification is
distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied. See the Apache License for the specific
language governing permissions and limitations under the Apache License.
330 lines
8.4 KiB
GLSL
330 lines
8.4 KiB
GLSL
//
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// Copyright 2013 Pixar
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//
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// Licensed under the Apache License, Version 2.0 (the "Apache License")
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// with the following modification; you may not use this file except in
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// compliance with the Apache License and the following modification to it:
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// Section 6. Trademarks. is deleted and replaced with:
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//
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// 6. Trademarks. This License does not grant permission to use the trade
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// names, trademarks, service marks, or product names of the Licensor
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// and its affiliates, except as required to comply with Section 4(c) of
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// the License and to reproduce the content of the NOTICE file.
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//
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// You may obtain a copy of the Apache License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the Apache License with the above modification is
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// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the Apache License for the specific
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// language governing permissions and limitations under the Apache License.
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//
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#line 57
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//--------------------------------------------------------------
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// Vertex Shader
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//--------------------------------------------------------------
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#ifdef VERTEX_SHADER
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layout (location=0) in vec4 position;
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out block {
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OutputVertex v;
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} outpt;
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void main()
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{
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outpt.v.position = ModelViewMatrix * position;
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}
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#endif // VERTEX_SHADER
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//--------------------------------------------------------------
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// Geometry Shader
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//--------------------------------------------------------------
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#ifdef GEOMETRY_SHADER
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uniform samplerBuffer g_uvFVarBuffer;
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#ifdef PRIM_QUAD
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layout(lines_adjacency) in;
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#ifdef GEOMETRY_OUT_FILL
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layout(triangle_strip, max_vertices = 4) out;
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#endif
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#ifdef GEOMETRY_OUT_LINE
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layout(line_strip, max_vertices = 5) out;
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#endif
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in block {
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OutputVertex v;
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} inpt[4];
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#endif // PRIM_QUAD
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#ifdef PRIM_TRI
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layout(triangles) in;
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#ifdef GEOMETRY_OUT_FILL
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layout(triangle_strip, max_vertices = 3) out;
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#endif
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#ifdef GEOMETRY_OUT_LINE
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layout(line_strip, max_vertices = 4) out;
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#endif
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in block {
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OutputVertex v;
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} inpt[3];
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#endif // PRIM_TRI
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#ifdef PRIM_POINT
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layout(points) in;
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layout(points, max_vertices = 1) out;
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in block {
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OutputVertex v;
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} inpt[1];
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#endif // PRIM_POINT
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out block {
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OutputVertex v;
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} outpt;
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void emitUniform(int index, vec3 normal)
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{
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outpt.v.position = inpt[index].v.position;
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#ifdef SMOOTH_NORMALS
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outpt.v.normal = inpt[index].v.normal;
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#else
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outpt.v.normal = normal;
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#endif
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// We fetch each uv component separately since the texture buffer
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// has a single component internal format, i.e. R32F instead of RG32F.
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// Start with an offset representing 4 verts per primitive and
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// multiply by 2 on each fetch to account for two floats per UV.
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// uvFVarBuffer is a flat array of floats, but is accessed as if it
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// has the structure of float[p][4][2] where p=primitiveID:
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// [ [ uv uv uv uv ] [ uv uv uv uv ] [ ... ] ]
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// prim 0 prim 1
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int uvOffset = gl_PrimitiveID * 4;
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outpt.v.patchCoord.st =
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vec2( texelFetch( g_uvFVarBuffer, (uvOffset+index)*2 ).s,
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texelFetch( g_uvFVarBuffer, (uvOffset+index)*2+1 ).s );
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gl_Position = ProjectionMatrix * inpt[index].v.position;
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EmitVertex();
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}
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void emitAdaptive(int index, vec3 normal, vec2 uvs[4])
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{
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outpt.v.position = inpt[index].v.position;
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#ifdef SMOOTH_NORMALS
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outpt.v.normal = inpt[index].v.normal;
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#else
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outpt.v.normal = normal;
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#endif
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// Bi-linear interpolation within the patch
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outpt.v.patchCoord = inpt[index].v.patchCoord;
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vec2 st = inpt[index].v.tessCoord;
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outpt.v.patchCoord.st =
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vec2( mix( mix(uvs[0].x, uvs[1].x, st.s ), mix(uvs[3].x, uvs[2].x, st.s ), st.t),
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mix( mix(uvs[0].y, uvs[1].y, st.s ), mix(uvs[3].y, uvs[2].y, st.s ), st.t) );
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gl_Position = ProjectionMatrix * inpt[index].v.position;
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EmitVertex();
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}
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void main()
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{
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gl_PrimitiveID = gl_PrimitiveIDIn;
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#ifdef FVAR_ADAPTIVE
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// We fetch each uv component separately since the texture buffer
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// has a single component internal format, i.e. R32F instead of RG32F.
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// Start with an offset representing 4 verts per primitive and
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// multiply by 2 on each fetch to account for two floats per UV.
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// uvFVarBuffer is a flat array of floats, but is accessed as if it
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// has the structure of float[p][4][2] where p=primitiveID:
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// [ [ uv uv uv uv ] [ uv uv uv uv ] [ ... ] ]
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// prim 0 prim 1
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// Offset based on prim id and offset into patch-type fvar data table
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int uvOffset = (gl_PrimitiveID+PrimitiveIdBase) * 4;
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vec2 uvs[4];
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uvs[0] = vec2( texelFetch( g_uvFVarBuffer, (uvOffset+0)*2 ).s,
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texelFetch( g_uvFVarBuffer, (uvOffset+0)*2+1 ).s );
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uvs[1] = vec2( texelFetch( g_uvFVarBuffer, (uvOffset+1)*2 ).s,
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texelFetch( g_uvFVarBuffer, (uvOffset+1)*2+1 ).s );
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uvs[2] = vec2( texelFetch( g_uvFVarBuffer, (uvOffset+2)*2 ).s,
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texelFetch( g_uvFVarBuffer, (uvOffset+2)*2+1 ).s );
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uvs[3] = vec2( texelFetch( g_uvFVarBuffer, (uvOffset+3)*2 ).s,
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texelFetch( g_uvFVarBuffer, (uvOffset+3)*2+1 ).s );
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#endif
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vec3 n0 = vec3(0);
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#if defined( PRIM_POINT )
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emitUniform(0, n0);
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#elif defined ( PRIM_TRI)
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vec3 A = (inpt[1].v.position - inpt[0].v.position).xyz;
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vec3 B = (inpt[2].v.position - inpt[0].v.position).xyz;
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n0 = normalize(cross(B, A));
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#ifdef FVAR_ADAPTIVE
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emitAdaptive(0, n0, uvs);
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emitAdaptive(1, n0, uvs);
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emitAdaptive(2, n0, uvs);
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#ifdef GEOMETRY_OUT_LINE
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emitAdaptive(0, n0, uvs);
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#endif //GEOMETRY_OUT_LINE
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#else
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emitUniform(0, n0);
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emitUniform(1, n0);
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emitUniform(2, n0);
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#ifdef GEOMETRY_OUT_LINE
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emitUniform(0, n0);
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#endif //GEOMETRY_OUT_LINE
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#endif //FVAR_ADAPTIVE
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#elif defined ( PRIM_QUAD )
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vec3 A = (inpt[0].v.position - inpt[1].v.position).xyz;
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vec3 B = (inpt[3].v.position - inpt[1].v.position).xyz;
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//vec3 C = (inpt[2].v.position - inpt[1].v.position).xyz;
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n0 = normalize(cross(B, A));
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#ifdef GEOMETRY_OUT_FILL
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emitUniform(0, n0);
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emitUniform(1, n0);
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emitUniform(3, n0);
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emitUniform(2, n0);
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#else // GEOMETRY_OUT_LINE
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emitUniform(0, n0);
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emitUniform(1, n0);
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emitUniform(2, n0);
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emitUniform(3, n0);
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emitUniform(0, n0);
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#endif //GEOMETRY_OUT_LINE
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#endif //PRIM_*
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EndPrimitive();
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}
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#endif // GEOMETRY_SHADER
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//--------------------------------------------------------------
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// Fragment Shader
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//--------------------------------------------------------------
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#ifdef FRAGMENT_SHADER
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uniform sampler2D diffuseMap;
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in block {
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OutputVertex v;
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} inpt;
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#define NUM_LIGHTS 2
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struct LightSource {
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vec4 position;
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vec4 diffuse;
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vec4 ambient;
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vec4 specular;
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};
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layout(std140) uniform Lighting {
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LightSource lightSource[NUM_LIGHTS];
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};
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uniform vec4 diffuseColor = vec4(0.8);
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uniform vec4 ambientColor = vec4(0.2);
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uniform vec4 specularColor = vec4(0.8);
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uniform float shininess = 64;
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vec4
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lighting(vec3 Peye, vec3 Neye, vec4 texColor)
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{
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vec4 color = vec4(0);
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for (int i = 0; i < NUM_LIGHTS; ++i) {
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vec4 Plight = lightSource[i].position;
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vec3 l = (Plight.w == 0.0)
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? normalize(Plight.xyz) : normalize(Plight.xyz - Peye);
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vec3 n = normalize(Neye);
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vec3 h = normalize(l + vec3(0,0,1)); // directional viewer
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float d = max(0.0, dot(n, l));
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float s = pow(max(0.0, dot(n, h)), shininess);
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color += lightSource[i].ambient * ambientColor
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+ d * lightSource[i].diffuse * diffuseColor * texColor
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+ s * lightSource[i].specular * specularColor;
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}
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color.a = 1;
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return color;
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}
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#ifdef PRIM_POINT
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uniform vec4 fragColor;
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void
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main()
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{
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gl_FragColor = fragColor;
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}
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#endif
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#ifdef GEOMETRY_OUT_LINE
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uniform vec4 fragColor;
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void
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main()
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{
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gl_FragColor = fragColor;
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}
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#endif
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#ifdef GEOMETRY_OUT_FILL
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void
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main()
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{
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vec3 N = (gl_FrontFacing ? inpt.v.normal : -inpt.v.normal);
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#ifdef USE_DIFFUSE_MAP
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vec4 texColor = texture(diffuseMap, inpt.v.patchCoord.st);
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gl_FragColor = lighting(inpt.v.position.xyz, N, texColor);
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#else
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gl_FragColor = lighting(inpt.v.position.xyz, N, vec4(1.0));
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#endif
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}
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#endif // GEOMETRY_OUT_LINE
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#endif // FRAGMENT_SHADER
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