diff options
author | Ton Roosendaal <ton@blender.org> | 2011-04-27 15:58:34 +0400 |
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committer | Ton Roosendaal <ton@blender.org> | 2011-04-27 15:58:34 +0400 |
commit | da376e0237517543aa21740ee2363234ee1c20ae (patch) | |
tree | 014a513ed8d0eccc5e54fef42347781e85bae56a /intern/cycles/kernel/svm/svm_blend.h | |
parent | 693780074388111e7b9ef1c3825e462f398dc6c4 (diff) |
Cycles render engine, initial commit. This is the engine itself, blender modifications and build instructions will follow later.
Cycles uses code from some great open source projects, many thanks them:
* BVH building and traversal code from NVidia's "Understanding the Efficiency of Ray Traversal on GPUs":
http://code.google.com/p/understanding-the-efficiency-of-ray-traversal-on-gpus/
* Open Shading Language for a large part of the shading system:
http://code.google.com/p/openshadinglanguage/
* Blender for procedural textures and a few other nodes.
* Approximate Catmull Clark subdivision from NVidia Mesh tools:
http://code.google.com/p/nvidia-mesh-tools/
* Sobol direction vectors from:
http://web.maths.unsw.edu.au/~fkuo/sobol/
* Film response functions from:
http://www.cs.columbia.edu/CAVE/software/softlib/dorf.php
Diffstat (limited to 'intern/cycles/kernel/svm/svm_blend.h')
-rw-r--r-- | intern/cycles/kernel/svm/svm_blend.h | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/intern/cycles/kernel/svm/svm_blend.h b/intern/cycles/kernel/svm/svm_blend.h new file mode 100644 index 00000000000..b1be7b7f6bc --- /dev/null +++ b/intern/cycles/kernel/svm/svm_blend.h @@ -0,0 +1,79 @@ +/* + * Copyright 2011, Blender Foundation. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +CCL_NAMESPACE_BEGIN + +/* Blend */ + +__device float svm_blend(float3 p, NodeBlendType type, NodeBlendAxis axis) +{ + float x, y; + + if(axis == NODE_BLEND_VERTICAL) { + x= p.y; + y= p.x; + } + else { + x= p.x; + y= p.y; + } + + if(type == NODE_BLEND_LINEAR) { + return (1.0f + x)/2.0f; + } + else if(type == NODE_BLEND_QUADRATIC) { + float r = fmaxf((1.0f + x)/2.0f, 0.0f); + return r*r; + } + else if(type == NODE_BLEND_EASING) { + float r = min(fmaxf((1.0f + x)/2.0f, 0.0f), 1.0f); + float t = r*r; + + return (3.0f*t - 2.0f*t*r); + } + else if(type == NODE_BLEND_DIAGONAL) { + return (2.0f + x + y)/4.0f; + } + else if(type == NODE_BLEND_RADIAL) { + return atan2(y, x)/(2.0f*M_PI_F) + 0.5f; + } + else { + float r = fmaxf(1.0f - sqrtf(x*x + y*y + p.z*p.z), 0.0f); + + if(type == NODE_BLEND_QUADRATIC_SPHERE) + return r*r; + else if(type == NODE_BLEND_SPHERICAL) + return r; + } + + return 0.0f; +} + +__device void svm_node_tex_blend(ShaderData *sd, float *stack, uint4 node) +{ + float3 co = stack_load_float3(stack, node.z); + uint type, axis; + + decode_node_uchar4(node.y, &type, &axis, NULL, NULL); + + float f = svm_blend(co, (NodeBlendType)type, (NodeBlendAxis)axis); + stack_store_float(stack, node.w, f); +} + +CCL_NAMESPACE_END + |