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Cycles: constant folding for RGB/Vector Curves and Color Ramp.

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These are complex nodes, and it's conceivable they may end up constant
in some circumstances within node groups, so folding support is useful.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D2084
This commit is contained in:
Alexander Gavrilov
2016-07-30 23:30:36 +02:00
committed by Brecht Van Lommel
parent f4bcc97729
commit ea2ebf7a00
11 changed files with 279 additions and 135 deletions
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21
intern/cycles/kernel/shaders/node_rgb_ramp.osl
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@@ -14,8 +14,7 @@
* limitations under the License.
*/
#include "stdosl.h"
#include "oslutil.h"
#include "node_ramp_util.h"
shader node_rgb_ramp(
color ramp_color[] = {0.0},
@@ -26,21 +25,7 @@ shader node_rgb_ramp(
output color Color = 0.0,
output float Alpha = 1.0)
{
int table_size = arraylength(ramp_color);
float f = clamp(Fac, 0.0, 1.0) * (table_size - 1);
/* clamp int as well in case of NaN */
int i = (int)f;
if (i < 0) i = 0;
if (i >= table_size) i = table_size - 1;
float t = f - (float)i;
Color = ramp_color[i];
Alpha = ramp_alpha[i];
if (interpolate && t > 0.0) {
Color = (1.0 - t) * Color + t * ramp_color[i + 1];
Alpha = (1.0 - t) * Alpha + t * ramp_alpha[i + 1];
}
Color = rgb_ramp_lookup(ramp_color, Fac, interpolate, 0);
Alpha = rgb_ramp_lookup(ramp_alpha, Fac, interpolate, 0);
}