[MotionVectors] PrevFrame support for user shader code.

drivers/gles3/storage/material_storage.cpp

@@ -1217,6 +1217,7 @@ MaterialStorage::MaterialStorage() {
  actions.renames["POINT_SIZE"] = "point_size";
  actions.renames["INSTANCE_ID"] = "gl_InstanceID";
  actions.renames["VERTEX_ID"] = "gl_VertexID";
+ actions.renames["PREV_FRAME_SWITCH"] = "false";
 
  actions.renames["ALPHA_SCISSOR_THRESHOLD"] = "alpha_scissor_threshold";
  actions.renames["ALPHA_HASH_SCALE"] = "alpha_hash_scale";

editor/plugins/visual_shader_editor_plugin.cpp

@@ -5703,6 +5703,7 @@ VisualShaderEditor::VisualShaderEditor() {
  add_options.push_back(AddOption("CameraDirectionWorld", "Input/Vertex", "VisualShaderNodeInput", vformat(input_param_for_vertex_and_fragment_shader_modes, "camera_direction_world", "CAMERA_DIRECTION_WORLD"), { "camera_direction_world" }, VisualShaderNode::PORT_TYPE_VECTOR_3D, TYPE_FLAGS_VERTEX, Shader::MODE_SPATIAL));
  add_options.push_back(AddOption("CameraVisibleLayers", "Input/Vertex", "VisualShaderNodeInput", vformat(input_param_for_vertex_and_fragment_shader_modes, "camera_visible_layers", "CAMERA_VISIBLE_LAYERS"), { "camera_visible_layers" }, VisualShaderNode::PORT_TYPE_SCALAR_UINT, TYPE_FLAGS_VERTEX, Shader::MODE_SPATIAL));
  add_options.push_back(AddOption("NodePositionView", "Input/Vertex", "VisualShaderNodeInput", vformat(input_param_for_vertex_and_fragment_shader_modes, "node_position_view", "NODE_POSITION_VIEW"), { "node_position_view" }, VisualShaderNode::PORT_TYPE_VECTOR_3D, TYPE_FLAGS_VERTEX, Shader::MODE_SPATIAL));
+ add_options.push_back(AddOption("PreviousFrameSwitch", "Input/Vertex", "VisualShaderNodeInput", vformat(input_param_for_vertex_shader_mode, "prev_frame_switch", "PREV_FRAME_SWITCH"), { "prev_frame_switch" }, VisualShaderNode::PORT_TYPE_BOOLEAN, TYPE_FLAGS_VERTEX, Shader::MODE_SPATIAL));
 
  add_options.push_back(AddOption("Binormal", "Input/Fragment", "VisualShaderNodeInput", vformat(input_param_for_vertex_and_fragment_shader_modes, "binormal", "BINORMAL"), { "binormal" }, VisualShaderNode::PORT_TYPE_VECTOR_3D, TYPE_FLAGS_FRAGMENT, Shader::MODE_SPATIAL));
  add_options.push_back(AddOption("Color", "Input/Fragment", "VisualShaderNodeInput", vformat(input_param_for_vertex_and_fragment_shader_modes, "color", "COLOR"), { "color" }, VisualShaderNode::PORT_TYPE_VECTOR_4D, TYPE_FLAGS_FRAGMENT, Shader::MODE_SPATIAL));

scene/resources/visual_shader.cpp

@@ -2879,6 +2879,7 @@ const VisualShaderNodeInput::Port VisualShaderNodeInput::ports[] = {
  { Shader::MODE_SPATIAL, VisualShader::TYPE_VERTEX, VisualShaderNode::PORT_TYPE_VECTOR_4D, "custom1", "CUSTOM1" },
  { Shader::MODE_SPATIAL, VisualShader::TYPE_VERTEX, VisualShaderNode::PORT_TYPE_VECTOR_4D, "custom2", "CUSTOM2" },
  { Shader::MODE_SPATIAL, VisualShader::TYPE_VERTEX, VisualShaderNode::PORT_TYPE_VECTOR_4D, "custom3", "CUSTOM3" },
+ { Shader::MODE_SPATIAL, VisualShader::TYPE_VERTEX, VisualShaderNode::PORT_TYPE_BOOLEAN, "prev_frame_switch", "PREV_FRAME_SWITCH" },
 
  // Node3D, Fragment
  { Shader::MODE_SPATIAL, VisualShader::TYPE_FRAGMENT, VisualShaderNode::PORT_TYPE_VECTOR_4D, "fragcoord", "FRAGCOORD" },

servers/rendering/renderer_rd/forward_clustered/scene_shader_forward_clustered.cpp

@@ -562,6 +562,7 @@ void SceneShaderForwardClustered::init(const String p_defines) {
  actions.renames["POINT_SIZE"] = "gl_PointSize";
  actions.renames["INSTANCE_ID"] = "gl_InstanceIndex";
  actions.renames["VERTEX_ID"] = "gl_VertexIndex";
+ actions.renames["PREV_FRAME_SWITCH"] = "prev_frame_switch";
 
  actions.renames["ALPHA_SCISSOR_THRESHOLD"] = "alpha_scissor_threshold";
  actions.renames["ALPHA_HASH_SCALE"] = "alpha_hash_scale";

servers/rendering/renderer_rd/forward_mobile/scene_shader_forward_mobile.cpp

@@ -466,6 +466,7 @@ void SceneShaderForwardMobile::init(const String p_defines) {
  actions.renames["POINT_SIZE"] = "gl_PointSize";
  actions.renames["INSTANCE_ID"] = "gl_InstanceIndex";
  actions.renames["VERTEX_ID"] = "gl_VertexIndex";
+ actions.renames["PREV_FRAME_SWITCH"] = "false";
 
  actions.renames["ALPHA_SCISSOR_THRESHOLD"] = "alpha_scissor_threshold";
  actions.renames["ALPHA_HASH_SCALE"] = "alpha_hash_scale";

servers/rendering/renderer_rd/shaders/forward_clustered/scene_forward_clustered.glsl

@@ -180,7 +180,7 @@ vec3 double_add_vec3(vec3 base_a, vec3 prec_a, vec3 base_b, vec3 prec_b, out vec
 }
 #endif
 
-void vertex_shader(vec3 vertex_input,
+void vertex_shader(in bool is_prev_frame, vec3 vertex_input,
 #ifdef NORMAL_USED
  in vec3 normal_input,
 #endif
@@ -384,6 +384,8 @@ void vertex_shader(vec3 vertex_input,
  mat4 read_view_matrix = scene_data.view_matrix;
  vec2 read_viewport_size = scene_data.viewport_size;
 
+ const bool prev_frame_switch = is_prev_frame;
+
  {
 #CODE : VERTEX
  }
@@ -575,7 +577,7 @@ void main() {
  prev_vertex);
 
  global_time = scene_data_block.prev_data.time;
- vertex_shader(prev_vertex,
+ vertex_shader(/*is_prev_frame=*/true, prev_vertex,
 #ifdef NORMAL_USED
  prev_normal,
 #endif
@@ -614,7 +616,7 @@ void main() {
 
  // Current vertex.
  global_time = scene_data_block.data.time;
- vertex_shader(vertex,
+ vertex_shader(/*is_prev_frame=*/false, vertex,
 #ifdef NORMAL_USED
  normal,
 #endif

servers/rendering/shader_types.cpp

@@ -83,6 +83,7 @@ ShaderTypes::ShaderTypes() {
  shader_modes[RS::SHADER_SPATIAL].functions["vertex"].built_ins["CUSTOM1"] = ShaderLanguage::TYPE_VEC4;
  shader_modes[RS::SHADER_SPATIAL].functions["vertex"].built_ins["CUSTOM2"] = ShaderLanguage::TYPE_VEC4;
  shader_modes[RS::SHADER_SPATIAL].functions["vertex"].built_ins["CUSTOM3"] = ShaderLanguage::TYPE_VEC4;
+ shader_modes[RS::SHADER_SPATIAL].functions["vertex"].built_ins["PREV_FRAME_SWITCH"] = constt(ShaderLanguage::TYPE_BOOL);
  shader_modes[RS::SHADER_SPATIAL].functions["vertex"].can_discard = false;
  shader_modes[RS::SHADER_SPATIAL].functions["vertex"].main_function = true;