Realtime Compositor: Add basic convert and vector nodes

This patch implements the following nodes for the realtime compositor:

- Map range node.
- Map value node.
- Math node.
- Normal node.
- Alpha convert node.
- Separate color node.
- Combine color node.
- Separate XYZ node.
- Combine XYZ node.
- Separate RGBA node.
- Combine RGBA node.
- Separate HSVA node.
- Combine HSVA node.
- Separate YCCA node.
- Combine YUVA node.
- Set alpha node.
- Switch node.
- Switch view node.
- RGB to BW node.
- Color ramp node.

Differential Revision: https://developer.blender.org/D15229

Reviewed By: Clement Foucault

1 files changed, 139 insertions, 9 deletions

diff --git a/source/blender/nodes/composite/nodes/node_composite_val_to_rgb.cc b/source/blender/nodes/composite/nodes/node_composite_val_to_rgb.cc
index df669d5beda..03a7bc61924 100644
--- a/source/blender/nodes/composite/nodes/node_composite_val_to_rgb.cc
+++ b/source/blender/nodes/composite/nodes/node_composite_val_to_rgb.cc
@@ -5,18 +5,33 @@
  * \ingroup cmpnodes
  */
 
+#include "BLI_assert.h"
+
+#include "IMB_colormanagement.h"
+
+#include "BKE_colorband.h"
+
+#include "GPU_material.h"
+
+#include "COM_shader_node.hh"
+
 #include "node_composite_util.hh"
 
 #include "BKE_colorband.h"
 
 /* **************** VALTORGB ******************** */
 
-namespace blender::nodes::node_composite_val_to_rgb_cc {
+namespace blender::nodes::node_composite_color_ramp_cc {
 
 static void cmp_node_valtorgb_declare(NodeDeclarationBuilder &b)
 {
-  b.add_input<decl::Float>(N_("Fac")).default_value(0.5f).min(0.0f).max(1.0f).subtype(PROP_FACTOR);
-  b.add_output<decl::Color>(N_("Image"));
+  b.add_input<decl::Float>(N_("Fac"))
+      .default_value(0.5f)
+      .min(0.0f)
+      .max(1.0f)
+      .subtype(PROP_FACTOR)
+      .compositor_domain_priority(1);
+  b.add_output<decl::Color>(N_("Image")).compositor_domain_priority(0);
   b.add_output<decl::Float>(N_("Alpha"));
 }
 
@@ -25,11 +40,94 @@ static void node_composit_init_valtorgb(bNodeTree *UNUSED(ntree), bNode *node)
   node->storage = BKE_colorband_add(true);
 }
 
-}  // namespace blender::nodes::node_composite_val_to_rgb_cc
+using namespace blender::realtime_compositor;
+
+class ColorRampShaderNode : public ShaderNode {
+ public:
+  using ShaderNode::ShaderNode;
+
+  void compile(GPUMaterial *material) override
+  {
+    GPUNodeStack *inputs = get_inputs_array();
+    GPUNodeStack *outputs = get_outputs_array();
+
+    struct ColorBand *color_band = get_color_band();
+
+    /* Common / easy case optimization. */
+    if ((color_band->tot <= 2) && (color_band->color_mode == COLBAND_BLEND_RGB)) {
+      float mul_bias[2];
+      switch (color_band->ipotype) {
+        case COLBAND_INTERP_LINEAR:
+          mul_bias[0] = 1.0f / (color_band->data[1].pos - color_band->data[0].pos);
+          mul_bias[1] = -mul_bias[0] * color_band->data[0].pos;
+          GPU_stack_link(material,
+                         &bnode(),
+                         "valtorgb_opti_linear",
+                         inputs,
+                         outputs,
+                         GPU_uniform(mul_bias),
+                         GPU_uniform(&color_band->data[0].r),
+                         GPU_uniform(&color_band->data[1].r));
+          return;
+        case COLBAND_INTERP_CONSTANT:
+          mul_bias[1] = max_ff(color_band->data[0].pos, color_band->data[1].pos);
+          GPU_stack_link(material,
+                         &bnode(),
+                         "valtorgb_opti_constant",
+                         inputs,
+                         outputs,
+                         GPU_uniform(&mul_bias[1]),
+                         GPU_uniform(&color_band->data[0].r),
+                         GPU_uniform(&color_band->data[1].r));
+          return;
+        case COLBAND_INTERP_EASE:
+          mul_bias[0] = 1.0f / (color_band->data[1].pos - color_band->data[0].pos);
+          mul_bias[1] = -mul_bias[0] * color_band->data[0].pos;
+          GPU_stack_link(material,
+                         &bnode(),
+                         "valtorgb_opti_ease",
+                         inputs,
+                         outputs,
+                         GPU_uniform(mul_bias),
+                         GPU_uniform(&color_band->data[0].r),
+                         GPU_uniform(&color_band->data[1].r));
+          return;
+        default:
+          BLI_assert_unreachable();
+          return;
+      }
+    }
+
+    float *array, layer;
+    int size;
+    BKE_colorband_evaluate_table_rgba(color_band, &array, &size);
+    GPUNodeLink *tex = GPU_color_band(material, size, array, &layer);
+
+    if (color_band->ipotype == COLBAND_INTERP_CONSTANT) {
+      GPU_stack_link(
+          material, &bnode(), "valtorgb_nearest", inputs, outputs, tex, GPU_constant(&layer));
+      return;
+    }
+
+    GPU_stack_link(material, &bnode(), "valtorgb", inputs, outputs, tex, GPU_constant(&layer));
+  }
+
+  struct ColorBand *get_color_band()
+  {
+    return static_cast<struct ColorBand *>(bnode().storage);
+  }
+};
+
+static ShaderNode *get_compositor_shader_node(DNode node)
+{
+  return new ColorRampShaderNode(node);
+}
+
+}  // namespace blender::nodes::node_composite_color_ramp_cc
 
 void register_node_type_cmp_valtorgb()
 {
-  namespace file_ns = blender::nodes::node_composite_val_to_rgb_cc;
+  namespace file_ns = blender::nodes::node_composite_color_ramp_cc;
 
   static bNodeType ntype;
 
@@ -38,31 +136,63 @@ void register_node_type_cmp_valtorgb()
   node_type_size(&ntype, 240, 200, 320);
   node_type_init(&ntype, file_ns::node_composit_init_valtorgb);
   node_type_storage(&ntype, "ColorBand", node_free_standard_storage, node_copy_standard_storage);
+  ntype.get_compositor_shader_node = file_ns::get_compositor_shader_node;
 
   nodeRegisterType(&ntype);
 }
 
 /* **************** RGBTOBW ******************** */
 
-namespace blender::nodes::node_composite_val_to_rgb_cc {
+namespace blender::nodes::node_composite_rgb_to_bw_cc {
 
 static void cmp_node_rgbtobw_declare(NodeDeclarationBuilder &b)
 {
-  b.add_input<decl::Color>(N_("Image")).default_value({0.8f, 0.8f, 0.8f, 1.0f});
+  b.add_input<decl::Color>(N_("Image"))
+      .default_value({0.8f, 0.8f, 0.8f, 1.0f})
+      .compositor_domain_priority(0);
   b.add_output<decl::Float>(N_("Val"));
 }
 
-}  // namespace blender::nodes::node_composite_val_to_rgb_cc
+using namespace blender::realtime_compositor;
+
+class RGBToBWShaderNode : public ShaderNode {
+ public:
+  using ShaderNode::ShaderNode;
+
+  void compile(GPUMaterial *material) override
+  {
+    GPUNodeStack *inputs = get_inputs_array();
+    GPUNodeStack *outputs = get_outputs_array();
+
+    float luminance_coefficients[3];
+    IMB_colormanagement_get_luminance_coefficients(luminance_coefficients);
+
+    GPU_stack_link(material,
+                   &bnode(),
+                   "color_to_luminance",
+                   inputs,
+                   outputs,
+                   GPU_constant(luminance_coefficients));
+  }
+};
+
+static ShaderNode *get_compositor_shader_node(DNode node)
+{
+  return new RGBToBWShaderNode(node);
+}
+
+}  // namespace blender::nodes::node_composite_rgb_to_bw_cc
 
 void register_node_type_cmp_rgbtobw()
 {
-  namespace file_ns = blender::nodes::node_composite_val_to_rgb_cc;
+  namespace file_ns = blender::nodes::node_composite_rgb_to_bw_cc;
 
   static bNodeType ntype;
 
   cmp_node_type_base(&ntype, CMP_NODE_RGBTOBW, "RGB to BW", NODE_CLASS_CONVERTER);
   ntype.declare = file_ns::cmp_node_rgbtobw_declare;
   node_type_size_preset(&ntype, NODE_SIZE_SMALL);
+  ntype.get_compositor_shader_node = file_ns::get_compositor_shader_node;
 
   nodeRegisterType(&ntype);
 }