Eevee: add blackbody shader node support.

This replaces the blackbody to RGB code with the simpler and faster one from
Cycles. It's a little different but the other placing using this is the legacy
volume drawing, so no need to stay compatible with that.

1 files changed, 11 insertions, 0 deletions

diff --git a/source/blender/nodes/shader/nodes/node_shader_blackbody.c b/source/blender/nodes/shader/nodes/node_shader_blackbody.c
index af89a959554..28019651926 100644
--- a/source/blender/nodes/shader/nodes/node_shader_blackbody.c
+++ b/source/blender/nodes/shader/nodes/node_shader_blackbody.c
@@ -38,6 +38,16 @@ static bNodeSocketTemplate sh_node_blackbody_out[] = {
 	{	-1, 0, ""	}
 };
 
+static int node_shader_gpu_blackbody(GPUMaterial *mat, bNode *node, bNodeExecData *UNUSED(execdata), GPUNodeStack *in, GPUNodeStack *out)
+{
+	const int size = 256;
+	float *data = MEM_mallocN(sizeof(float) * size * 4, "blackbody texture");
+
+	blackbody_temperature_to_rgb_table(data, size, 965.0f, 12000.0f);
+
+	return GPU_stack_link(mat, node, "node_blackbody", in, out, GPU_texture(size, data));
+}
+
 /* node type definition */
 void register_node_type_sh_blackbody(void)
 {
@@ -49,6 +59,7 @@ void register_node_type_sh_blackbody(void)
 	node_type_socket_templates(&ntype, sh_node_blackbody_in, sh_node_blackbody_out);
 	node_type_init(&ntype, NULL);
 	node_type_storage(&ntype, "", NULL, NULL);
+	node_type_gpu(&ntype, node_shader_gpu_blackbody);
 
 	nodeRegisterType(&ntype);
 }