mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
synced 2024-12-11 03:40:05 +00:00
327 lines
10 KiB
GLSL
327 lines
10 KiB
GLSL
//
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// Copyright (C) Pixar. All rights reserved.
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//
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// This license governs use of the accompanying software. If you
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// use the software, you accept this license. If you do not accept
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// the license, do not use the software.
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//
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// 1. Definitions
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// The terms "reproduce," "reproduction," "derivative works," and
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// "distribution" have the same meaning here as under U.S.
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// copyright law. A "contribution" is the original software, or
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// any additions or changes to the software.
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// A "contributor" is any person or entity that distributes its
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// contribution under this license.
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// "Licensed patents" are a contributor's patent claims that read
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// directly on its contribution.
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//
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// 2. Grant of Rights
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// (A) Copyright Grant- Subject to the terms of this license,
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// including the license conditions and limitations in section 3,
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// each contributor grants you a non-exclusive, worldwide,
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// royalty-free copyright license to reproduce its contribution,
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// prepare derivative works of its contribution, and distribute
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// its contribution or any derivative works that you create.
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// (B) Patent Grant- Subject to the terms of this license,
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// including the license conditions and limitations in section 3,
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// each contributor grants you a non-exclusive, worldwide,
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// royalty-free license under its licensed patents to make, have
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// made, use, sell, offer for sale, import, and/or otherwise
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// dispose of its contribution in the software or derivative works
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// of the contribution in the software.
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//
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// 3. Conditions and Limitations
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// (A) No Trademark License- This license does not grant you
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// rights to use any contributor's name, logo, or trademarks.
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// (B) If you bring a patent claim against any contributor over
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// patents that you claim are infringed by the software, your
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// patent license from such contributor to the software ends
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// automatically.
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// (C) If you distribute any portion of the software, you must
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// retain all copyright, patent, trademark, and attribution
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// notices that are present in the software.
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// (D) If you distribute any portion of the software in source
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// code form, you may do so only under this license by including a
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// complete copy of this license with your distribution. If you
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// distribute any portion of the software in compiled or object
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// code form, you may only do so under a license that complies
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// with this license.
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// (E) The software is licensed "as-is." You bear the risk of
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// using it. The contributors give no express warranties,
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// guarantees or conditions. You may have additional consumer
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// rights under your local laws which this license cannot change.
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// To the extent permitted under your local laws, the contributors
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// exclude the implied warranties of merchantability, fitness for
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// a particular purpose and non-infringement.
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//
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vec4 PTexLookup(vec4 patchCoord,
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sampler2DArray data,
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samplerBuffer packings,
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isamplerBuffer pages)
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{
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vec2 uv = patchCoord.xy;
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int faceID = int(patchCoord.w);
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int page = texelFetch(pages, faceID).x;
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vec4 packing = texelFetch(packings, faceID);
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vec3 coords = vec3( packing.x + uv.x * packing.z,
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packing.y + uv.y * packing.w,
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page);
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return texture(data, coords);
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}
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uniform sampler2DArray textureImage_Data;
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uniform samplerBuffer textureImage_Packing;
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uniform isamplerBuffer textureImage_Pages;
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vec4 displacement(vec4 position, vec3 normal, vec4 patchCoord)
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{
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float disp = PTexLookup(patchCoord,
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textureImage_Data,
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textureImage_Packing,
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textureImage_Pages).x;
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return position + 0.01*vec4(disp * normal, 0);
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}
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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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layout(triangles) in;
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layout(triangle_strip, max_vertices = 3) out;
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#define EDGE_VERTS 3
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in block {
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OutputVertex v;
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} inpt[3];
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out block {
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OutputVertex v;
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noperspective out vec4 edgeDistance;
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} outpt;
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void emit(int index, vec4 position, vec3 normal, vec4 patchCoord)
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{
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outpt.v.position = position;
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outpt.v.patchCoord = patchCoord;
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outpt.v.normal = normal;
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gl_Position = ProjectionMatrix * outpt.v.position;
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EmitVertex();
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}
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const float VIEWPORT_SCALE = 1024.0; // XXXdyu
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float edgeDistance(vec4 p, vec4 p0, vec4 p1)
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{
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return VIEWPORT_SCALE *
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abs((p.x - p0.x) * (p1.y - p0.y) -
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(p.y - p0.y) * (p1.x - p0.x)) / length(p1.xy - p0.xy);
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}
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void emit(int index, vec4 position, vec3 normal, vec4 patchCoord, vec4 edgeVerts[EDGE_VERTS])
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{
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outpt.edgeDistance[0] =
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edgeDistance(edgeVerts[index], edgeVerts[0], edgeVerts[1]);
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outpt.edgeDistance[1] =
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edgeDistance(edgeVerts[index], edgeVerts[1], edgeVerts[2]);
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outpt.edgeDistance[2] =
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edgeDistance(edgeVerts[index], edgeVerts[2], edgeVerts[0]);
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emit(index, position, normal, patchCoord);
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}
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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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vec4 position[3];
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vec4 patchCoord[3];
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vec3 normal[3];
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// patch coords are computed in tessellation shader
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patchCoord[0] = inpt[0].v.patchCoord;
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patchCoord[1] = inpt[1].v.patchCoord;
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patchCoord[2] = inpt[2].v.patchCoord;
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#ifdef USE_PTEX_DISPLACEMENT
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position[0] = displacement(inpt[0].v.position, inpt[0].v.normal, patchCoord[0]);
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position[1] = displacement(inpt[1].v.position, inpt[1].v.normal, patchCoord[1]);
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position[2] = displacement(inpt[2].v.position, inpt[2].v.normal, patchCoord[2]);
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#else
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position[0] = inpt[0].v.position;
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position[1] = inpt[1].v.position;
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position[2] = inpt[2].v.position;
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#endif
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normal[0] = inpt[0].v.normal;
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normal[1] = inpt[1].v.normal;
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normal[2] = inpt[2].v.normal;
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#if defined(GEOMETRY_OUT_WIRE) || defined(GEOMETRY_OUT_LINE)
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vec4 edgeVerts[EDGE_VERTS];
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edgeVerts[0] = ProjectionMatrix * inpt[0].v.position;
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edgeVerts[1] = ProjectionMatrix * inpt[1].v.position;
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edgeVerts[2] = ProjectionMatrix * inpt[2].v.position;
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edgeVerts[0].xy /= edgeVerts[0].w;
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edgeVerts[1].xy /= edgeVerts[1].w;
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edgeVerts[2].xy /= edgeVerts[2].w;
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emit(0, position[0], normal[0], patchCoord[0], edgeVerts);
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emit(1, position[1], normal[1], patchCoord[1], edgeVerts);
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emit(2, position[2], normal[2], patchCoord[2], edgeVerts);
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#else
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emit(0, position[0], normal[0], patchCoord[0]);
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emit(1, position[1], normal[1], patchCoord[1]);
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emit(2, position[2], normal[2], patchCoord[2]);
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#endif
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EndPrimitive();
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}
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#endif
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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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in block {
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OutputVertex v;
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noperspective in vec4 edgeDistance;
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} inpt;
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out vec4 outColor;
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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 ambient;
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vec4 diffuse;
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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(1);
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uniform vec4 ambientColor = vec4(1);
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vec4
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lighting(vec4 diffuse, vec3 Peye, vec3 Neye)
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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)), 500.0f);
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color += lightSource[i].ambient * ambientColor
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+ d * lightSource[i].diffuse * diffuse
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+ s * lightSource[i].specular;
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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 USE_PTEX_DISPLACEMENT
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vec3
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perturbNormalFromDisplacement(vec3 position, vec3 normal, vec4 patchCoord)
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{
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// by Morten S. Mikkelsen
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// http://jbit.net/~sparky/sfgrad_bump/mm_sfgrad_bump.pdf
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// slightly modified for ptex guttering
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vec3 vSigmaS = dFdx(position);
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vec3 vSigmaT = dFdy(position);
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vec3 vN = normal;
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vec3 vR1 = cross(vSigmaT, vN);
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vec3 vR2 = cross(vN, vSigmaS);
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float fDet = dot(vSigmaS, vR1);
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vec2 texDx = dFdx(patchCoord.xy);
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vec2 texDy = dFdy(patchCoord.xy);
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// limit forward differencing to the width of ptex gutter
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const float resolution = 128.0;
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float d = (0.5/resolution)/max(length(texDx), length(texDy));
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vec4 STll = patchCoord;
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vec4 STlr = patchCoord + d * vec4(texDx.x, texDx.y, 0, 0);
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vec4 STul = patchCoord + d * vec4(texDy.x, texDy.y, 0, 0);
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float Hll = PTexLookup(STll, textureImage_Data, textureImage_Packing, textureImage_Pages).x;
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float Hlr = PTexLookup(STlr, textureImage_Data, textureImage_Packing, textureImage_Pages).x;
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float Hul = PTexLookup(STul, textureImage_Data, textureImage_Packing, textureImage_Pages).x;
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float dBs = (Hlr - Hll)/d;
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float dBt = (Hul - Hll)/d;
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vec3 vSurfGrad = sign(fDet) * (dBs * vR1 + dBt * vR2);
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return normalize(abs(fDet) * vN - vSurfGrad);
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}
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#endif // USE_PTEX_NORMAL
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vec4
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edgeColor(vec4 Cfill, vec4 edgeDistance)
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{
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#if defined(GEOMETRY_OUT_WIRE) || defined(GEOMETRY_OUT_LINE)
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float d =
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min(inpt.edgeDistance[0], min(inpt.edgeDistance[1], inpt.edgeDistance[2]));
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vec4 Cedge = vec4(0.5, 0.5, 0.5, 1.0);
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float p = exp2(-2 * d * d);
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#if defined(GEOMETRY_OUT_WIRE)
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if (p < 0.25) discard;
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#endif
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Cfill.rgb = mix(Cfill.rgb, Cedge.rgb, p);
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#endif
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return Cfill;
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}
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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_PTEX_DISPLACEMENT
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N = perturbNormalFromDisplacement(inpt.v.position.xyz,
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N,
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inpt.v.patchCoord);
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#endif
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vec4 Cf = vec4(1.0);
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#if defined(GEOMETRY_OUT_WIRE) || defined(GEOMETRY_OUT_LINE)
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Cf = edgeColor(Cf, inpt.edgeDistance);
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#endif
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#ifdef USE_PTEX_COLOR
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Cf = Cf * (vec4(1) - vec4(PTexLookup(inpt.v.patchCoord,
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textureImage_Data,
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textureImage_Packing,
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textureImage_Pages).x));
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#endif
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Cf = lighting(Cf, inpt.v.position.xyz, N);
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outColor = Cf;
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}
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#endif
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