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Brightness/Contrast Node for Cycles

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Contrast helps to adjust IBL (HDR images used for background lighting).
Note: In the UI we are caling it Bright instead of Brightness. This copy what Blender composite is doing.
Note2: the algorithm we are using produces pure black when contrast is 100. I'm not a fan of that, but it's a division by zero. I would like to look at other algorithms (what gimp does for example). But that would be only after 2.62.
This commit is contained in:
Dalai Felinto
2012-01-24 16:32:31 +00:00
parent 1f9e25ac1a
commit 335ffb0ff3
17 changed files with 224 additions and 6 deletions
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32
intern/cycles/render/nodes.cpp
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@@ -1820,6 +1820,38 @@ void GammaNode::compile(OSLCompiler& compiler)
compiler.add(this, "node_gamma");
}
/* Bright Contrast */
BrightContrastNode::BrightContrastNode()
: ShaderNode("brightness")
{
add_input("Color", SHADER_SOCKET_COLOR);
add_input("Bright", SHADER_SOCKET_FLOAT);
add_input("Contrast", SHADER_SOCKET_FLOAT);
add_output("Color", SHADER_SOCKET_COLOR);
}
void BrightContrastNode::compile(SVMCompiler& compiler)
{
ShaderInput *color_in = input("Color");
ShaderInput *bright_in = input("Bright");
ShaderInput *contrast_in = input("Contrast");
ShaderOutput *color_out = output("Color");
compiler.stack_assign(color_in);
compiler.stack_assign(bright_in);
compiler.stack_assign(contrast_in);
compiler.stack_assign(color_out);
compiler.add_node(NODE_BRIGHTCONTRAST,
color_in->stack_offset, color_out->stack_offset,
compiler.encode_uchar4(bright_in->stack_offset, contrast_in->stack_offset));
}
void BrightContrastNode::compile(OSLCompiler& compiler)
{
compiler.add(this, "node_brightness");
}
/* Separate RGB */
SeparateRGBNode::SeparateRGBNode()
: ShaderNode("separate_rgb")