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OSL implementation of RGB ramp node.

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The sampled color ramp data is passed to OSL as a color array. This has to be done as actual float[3] array though, since the Cycles float3 type actually contains 4 floats, leading to shifting color components in the array.

Additional parameter set functions for arrays have been added to the Cycles OSL interface for this purpose.
This commit is contained in:
Lukas Toenne
2012-09-15 15:41:37 +00:00
parent 2390a2657e
commit 21964e6538
6 changed files with 134 additions and 0 deletions
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13
intern/cycles/render/nodes.cpp
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@@ -2768,6 +2768,19 @@ void RGBRampNode::compile(SVMCompiler& compiler)
void RGBRampNode::compile(OSLCompiler& compiler)
{
/* OSL shader only takes separate RGB and A array, split the RGBA base array */
/* NB: cycles float3 type is actually 4 floats! need to use an explicit array */
float ramp_color[RAMP_TABLE_SIZE][3];
float ramp_alpha[RAMP_TABLE_SIZE];
for (int i = 0; i < RAMP_TABLE_SIZE; ++i) {
ramp_color[i][0] = ramp[i].x;
ramp_color[i][1] = ramp[i].y;
ramp_color[i][2] = ramp[i].z;
ramp_alpha[i] = ramp[i].w;
}
compiler.parameter_color_array("ramp_color", ramp_color, RAMP_TABLE_SIZE);
compiler.parameter_array("ramp_alpha", ramp_alpha, RAMP_TABLE_SIZE);
compiler.add(this, "node_rgb_ramp");
}