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

1 files changed, 181 insertions, 0 deletions

diff --git a/intern/cycles/kernel/svm/svm_math.h b/intern/cycles/kernel/svm/svm_math.h
new file mode 100644
index 00000000000..6650a10a4d9
--- /dev/null
+++ b/intern/cycles/kernel/svm/svm_math.h
@@ -0,0 +1,181 @@
+/*
+ * 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
+
+__device float safe_asinf(float a)
+{
+	if(a <= -1.0f)
+		return -M_PI_2;
+	else if(a >= 1.0f)
+		return M_PI_2_F;
+
+	return asinf(a);
+}
+
+__device float safe_acosf(float a)
+{
+	if(a <= -1.0f)
+		return M_PI_F;
+	else if(a >= 1.0f)
+		return 0.0f;
+
+	return acosf(a);
+}
+
+__device float safe_powf(float a, float b)
+{
+	if(b == 0.0f)
+		return 1.0f;
+	if(a == 0.0f)
+		return 0.0f;
+	if(a < 0.0f && b != (int)b)
+		return 0.0f;
+	
+	return powf(a, b);
+}
+
+__device float safe_logf(float a, float b)
+{
+	if(a < 0.0f || b < 0.0f)
+		return 0.0f;
+
+	return logf(a)/logf(b);
+}
+
+__device float safe_divide(float a, float b)
+{
+	float result;
+
+	if(b == 0.0f)
+		result = 0.0f;
+	else
+		result = a/b;
+	
+	return result;
+}
+
+__device float svm_math(NodeMath type, float Fac1, float Fac2)
+{
+	float Fac;
+
+	if(type == NODE_MATH_ADD)
+		Fac = Fac1 + Fac2;
+	else if(type == NODE_MATH_SUBTRACT)
+		Fac = Fac1 - Fac2;
+	else if(type == NODE_MATH_MULTIPLY)
+		Fac = Fac1*Fac2;
+	else if(type == NODE_MATH_DIVIDE)
+		Fac = safe_divide(Fac1, Fac2);
+	else if(type == NODE_MATH_SINE)
+		Fac = sinf(Fac1);
+	else if(type == NODE_MATH_COSINE)
+		Fac = cosf(Fac1);
+	else if(type == NODE_MATH_TANGENT)
+		Fac = tanf(Fac1);
+	else if(type == NODE_MATH_ARCSINE)
+		Fac = safe_asinf(Fac1);
+	else if(type == NODE_MATH_ARCCOSINE)
+		Fac = safe_acosf(Fac1);
+	else if(type == NODE_MATH_ARCTANGENT)
+		Fac = atanf(Fac1);
+	else if(type == NODE_MATH_POWER)
+		Fac = safe_powf(Fac1, Fac2);
+	else if(type == NODE_MATH_LOGARITHM)
+		Fac = safe_logf(Fac1, Fac2);
+	else if(type == NODE_MATH_MINIMUM)
+		Fac = fminf(Fac1, Fac2);
+	else if(type == NODE_MATH_MAXIMUM)
+		Fac = fmaxf(Fac1, Fac2);
+	else if(type == NODE_MATH_ROUND)
+		Fac = floorf(Fac1 + 0.5f);
+	else if(type == NODE_MATH_LESS_THAN)
+		Fac = Fac1 < Fac2;
+	else if(type == NODE_MATH_GREATER_THAN)
+		Fac = Fac1 > Fac2;
+	else
+		Fac = 0.0f;
+	
+	return Fac;
+}
+
+__device void svm_vector_math(float *Fac, float3 *Vector, NodeVectorMath type, float3 Vector1, float3 Vector2)
+{
+	if(type == NODE_VECTOR_MATH_ADD) {
+		*Vector = Vector1 + Vector2;
+		*Fac = (fabsf(Vector->x) + fabsf(Vector->y) + fabsf(Vector->z))/3.0f;
+	}
+	else if(type == NODE_VECTOR_MATH_SUBTRACT) {
+		*Vector = Vector1 + Vector2;
+		*Fac = (fabsf(Vector->x) + fabsf(Vector->y) + fabsf(Vector->z))/3.0f;
+	}
+	else if(type == NODE_VECTOR_MATH_AVERAGE) {
+		*Fac = len(Vector1 + Vector2);
+		*Vector = normalize(Vector1 + Vector2);
+	}
+	else if(type == NODE_VECTOR_MATH_DOT_PRODUCT) {
+		*Fac = dot(Vector1, Vector2);
+		*Vector = make_float3(0.0f, 0.0f, 0.0f);
+	}
+	else if(type == NODE_VECTOR_MATH_CROSS_PRODUCT) {
+		float3 c = cross(Vector1, Vector2);
+		*Fac = len(c);
+		*Vector = normalize(c);
+	}
+	else if(type == NODE_VECTOR_MATH_NORMALIZE) {
+		*Fac = len(Vector1);
+		*Vector = normalize(Vector1);
+	}
+	else {
+		*Fac = 0.0f;
+		*Vector = make_float3(0.0f, 0.0f, 0.0f);
+	}
+}
+
+/* Nodes */
+
+__device void svm_node_math(KernelGlobals *kg, ShaderData *sd, float *stack, uint itype, uint f1_offset, uint f2_offset, int *offset)
+{
+	NodeMath type = (NodeMath)itype;
+	float f1 = stack_load_float(stack, f1_offset);
+	float f2 = stack_load_float(stack, f2_offset);
+	float f = svm_math(type, f1, f2);
+
+	uint4 node1 = read_node(kg, offset);
+
+	stack_store_float(stack, node1.y, f);
+}
+
+__device void svm_node_vector_math(KernelGlobals *kg, ShaderData *sd, float *stack, uint itype, uint v1_offset, uint v2_offset, int *offset)
+{
+	NodeVectorMath type = (NodeVectorMath)itype;
+	float3 v1 = stack_load_float3(stack, v1_offset);
+	float3 v2 = stack_load_float3(stack, v2_offset);
+	float f;
+	float3 v;
+
+	svm_vector_math(&f, &v, type, v1, v2);
+
+	uint4 node1 = read_node(kg, offset);
+
+	if(stack_valid(node1.y)) stack_store_float(stack, node1.y, f);
+	if(stack_valid(node1.z)) stack_store_float3(stack, node1.z, v);
+}
+
+CCL_NAMESPACE_END
+