Overlay: port paint shaders to use 'GPUShaderCreateInfo'

Simple port.

Also a description of how each shader is used has been added.

NOTE: The shader created using `OVERLAY_shader_paint_vertcol` cannot be tested.
Apparently it is created but not used.

Reviewed By: fclem

Differential Revision: https://developer.blender.org/D14812

1 files changed, 180 insertions, 0 deletions

diff --git a/source/blender/draw/engines/overlay/shaders/infos/paint_info.hh b/source/blender/draw/engines/overlay/shaders/infos/paint_info.hh
new file mode 100644
index 00000000000..bbec79d515f
--- /dev/null
+++ b/source/blender/draw/engines/overlay/shaders/infos/paint_info.hh
@@ -0,0 +1,180 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include "gpu_shader_create_info.hh"
+
+/* -------------------------------------------------------------------- */
+/** \name OVERLAY_shader_paint_face.
+ *
+ * Used for face selection mode in Weight, Vertex and Texture Paint.
+ * \{ */
+
+GPU_SHADER_CREATE_INFO(overlay_paint_face)
+    .do_static_compilation(true)
+    .define("srgbTarget", "false") /* NOTE: Color already in Linear space. */
+    .vertex_in(0, Type::VEC3, "pos")
+    .vertex_in(1, Type::VEC4, "nor") /* Select flag on the 4th component. */
+    .push_constant(Type::VEC4, "color")
+    .fragment_out(0, Type::VEC4, "fragColor")
+    .vertex_source("paint_face_vert.glsl")
+    .fragment_source("gpu_shader_uniform_color_frag.glsl")
+    .additional_info("draw_modelmat");
+
+GPU_SHADER_CREATE_INFO(overlay_paint_face_clipped)
+    .additional_info("overlay_paint_face")
+    .additional_info("drw_clipped")
+    .do_static_compilation(true);
+
+/** \} */
+
+/* -------------------------------------------------------------------- */
+/** \name OVERLAY_shader_paint_point.
+ *
+ * Used for vertex selection mode in Weight and Vertex Paint.
+ * \{ */
+
+GPU_SHADER_INTERFACE_INFO(overlay_overlay_paint_point_iface, "").smooth(Type::VEC4, "finalColor");
+
+GPU_SHADER_CREATE_INFO(overlay_paint_point)
+    .do_static_compilation(true)
+    .vertex_in(0, Type::VEC3, "pos")
+    .vertex_in(1, Type::VEC4, "nor") /* Select flag on the 4th component. */
+    .vertex_out(overlay_overlay_paint_point_iface)
+    .fragment_out(0, Type::VEC4, "fragColor")
+    .vertex_source("paint_point_vert.glsl")
+    .fragment_source("gpu_shader_point_varying_color_frag.glsl")
+    .additional_info("draw_modelmat", "draw_globals");
+
+GPU_SHADER_CREATE_INFO(overlay_paint_point_clipped)
+    .additional_info("overlay_paint_point")
+    .additional_info("drw_clipped")
+    .do_static_compilation(true);
+
+/** \} */
+
+/* -------------------------------------------------------------------- */
+/** \name OVERLAY_shader_paint_texture.
+ *
+ * Used in Texture Paint mode for the Stencil Image Masking.
+ * \{ */
+
+GPU_SHADER_INTERFACE_INFO(overlay_paint_texture_iface, "").smooth(Type::VEC2, "uv_interp");
+
+GPU_SHADER_CREATE_INFO(overlay_paint_texture)
+    .do_static_compilation(true)
+    .vertex_in(0, Type::VEC3, "pos")
+    .vertex_in(1, Type::VEC2, "mu") /* Masking uv map. */
+    .vertex_out(overlay_paint_texture_iface)
+    .sampler(0, ImageType::FLOAT_2D, "maskImage")
+    .push_constant(Type::VEC3, "maskColor")
+    .push_constant(Type::FLOAT, "opacity") /* `1.0` by default. */
+    .push_constant(Type::BOOL, "maskInvertStencil")
+    .push_constant(Type::BOOL, "maskImagePremultiplied")
+    .fragment_out(0, Type::VEC4, "fragColor")
+    .vertex_source("paint_texture_vert.glsl")
+    .fragment_source("paint_texture_frag.glsl")
+    .additional_info("draw_modelmat");
+
+GPU_SHADER_CREATE_INFO(overlay_paint_texture_clipped)
+    .additional_info("overlay_paint_texture")
+    .additional_info("drw_clipped")
+    .do_static_compilation(true);
+
+/** \} */
+
+/* -------------------------------------------------------------------- */
+/** \name OVERLAY_shader_paint_vertcol.
+ *
+ * It should be used to draw a Vertex Paint overlay. But it is currently unreachable.
+ * \{ */
+
+GPU_SHADER_INTERFACE_INFO(overlay_paint_vertcol_iface, "").smooth(Type::VEC3, "finalColor");
+
+GPU_SHADER_CREATE_INFO(overlay_paint_vertcol)
+    .do_static_compilation(true)
+    .vertex_in(0, Type::VEC3, "pos")
+    .vertex_in(1, Type::VEC3, "ac") /* Active color. */
+    .vertex_out(overlay_paint_vertcol_iface)
+    .push_constant(Type::FLOAT, "opacity")      /* `1.0` by default. */
+    .push_constant(Type::BOOL, "useAlphaBlend") /* `false` by default. */
+    .fragment_out(0, Type::VEC4, "fragColor")
+    .vertex_source("paint_vertcol_vert.glsl")
+    .fragment_source("paint_vertcol_frag.glsl")
+    .additional_info("draw_modelmat");
+
+GPU_SHADER_CREATE_INFO(overlay_paint_vertcol_clipped)
+    .additional_info("overlay_paint_vertcol")
+    .additional_info("drw_clipped")
+    .do_static_compilation(true);
+
+/** \} */
+
+/* -------------------------------------------------------------------- */
+/** \name OVERLAY_shader_paint_weight.
+ *
+ * Used to display Vertex Weights.
+ * `overlay paint weight` is for wireframe display mode.
+ * \{ */
+
+GPU_SHADER_INTERFACE_INFO(overlay_paint_weight_iface, "")
+    .smooth(Type::VEC2, "weight_interp") /* (weight, alert) */
+    .smooth(Type::FLOAT, "color_fac");
+
+GPU_SHADER_CREATE_INFO(overlay_paint_weight)
+    .do_static_compilation(true)
+    .vertex_in(0, Type::FLOAT, "weight")
+    .vertex_in(1, Type::VEC3, "pos")
+    .vertex_in(2, Type::VEC3, "nor")
+    .vertex_out(overlay_paint_weight_iface)
+    .sampler(0, ImageType::FLOAT_1D, "colorramp")
+    .push_constant(Type::FLOAT, "opacity")     /* `1.0` by default. */
+    .push_constant(Type::BOOL, "drawContours") /* `false` by default. */
+    .fragment_out(0, Type::VEC4, "fragColor")
+    .vertex_source("paint_weight_vert.glsl")
+    .fragment_source("paint_weight_frag.glsl")
+    .additional_info("draw_modelmat", "draw_globals");
+
+GPU_SHADER_CREATE_INFO(overlay_paint_weight_fake_shading)
+    .additional_info("overlay_paint_weight")
+    .define("FAKE_SHADING")
+    .push_constant(Type::VEC3, "light_dir")
+    .do_static_compilation(true);
+
+GPU_SHADER_CREATE_INFO(overlay_paint_weight_clipped)
+    .additional_info("overlay_paint_weight")
+    .additional_info("drw_clipped")
+    .do_static_compilation(true);
+
+GPU_SHADER_CREATE_INFO(overlay_paint_weight_fake_shading_clipped)
+    .additional_info("overlay_paint_weight_fake_shading")
+    .additional_info("drw_clipped")
+    .do_static_compilation(true);
+
+/** \} */
+
+/* -------------------------------------------------------------------- */
+/** \name OVERLAY_shader_paint_wire.
+ *
+ * Used in face selection mode to display edges of selected faces in Weight, Vertex and Texture
+ * paint modes.
+ * \{ */
+
+GPU_SHADER_INTERFACE_INFO(overlay_paint_wire_iface, "").flat(Type::VEC4, "finalColor");
+
+GPU_SHADER_CREATE_INFO(overlay_paint_wire)
+    .do_static_compilation(true)
+    .define("srgbTarget", "false") /* NOTE: Color already in Linear space. */
+    .vertex_in(0, Type::VEC3, "pos")
+    .vertex_in(1, Type::VEC4, "nor") /* flag stored in w */
+    .vertex_out(overlay_paint_wire_iface)
+    .push_constant(Type::BOOL, "useSelect")
+    .fragment_out(0, Type::VEC4, "fragColor")
+    .vertex_source("paint_wire_vert.glsl")
+    .fragment_source("gpu_shader_flat_color_frag.glsl")
+    .additional_info("draw_modelmat", "draw_globals");
+
+GPU_SHADER_CREATE_INFO(overlay_paint_wire_clipped)
+    .additional_info("overlay_paint_vertcol")
+    .additional_info("drw_clipped")
+    .do_static_compilation(true);
+
+/** \} */