cursor trails

src/draw/draw.c

@@ -318,6 +318,7 @@ dr_rect(Rng2F32 dst, Vec4F32 color, F32 corner_radius, F32 border_thickness, F32
   inst->border_thickness = border_thickness;
   inst->edge_softness = edge_softness;
   inst->white_texture_override = 1.f;
+  inst->shear = 0.f;
   bucket->last_cmd_stack_gen = bucket->stack_gen;
   return inst;
 }
@@ -363,6 +364,7 @@ dr_img(Rng2F32 dst, Rng2F32 src, R_Handle texture, Vec4F32 color, F32 corner_rad
   inst->border_thickness = border_thickness;
   inst->edge_softness = edge_softness;
   inst->white_texture_override = 0.f;
+  inst->shear = 0.f;
   bucket->last_cmd_stack_gen = bucket->stack_gen;
   return inst;
 }

src/raddbg/raddbg.mdesk

@@ -264,6 +264,10 @@ RD_VocabTable:
       @default(1) @display_name('Cursor Scope Lines') @description("Controls whether or not scopes containing the cursor in text views are drawn.")
         'cursor_scope_lines': bool,
       
+      //- rjf: cursor decorations
+      @default(1) @display_name('Cursor Trail') @description("Controls whether or not a movement trail of the cursor is drawn.")
+        'cursor_trail': bool,
+      
       //- rjf: thread & breakpoint decorations
       @default(1) @display_name('Thread Lines') @description("Controls whether or not a long horizontal line is drawn before the next line or instruction that the selected thread will execute in source and disassembly views.")
         'thread_lines': bool,

src/raddbg/raddbg_widgets.c

@@ -1277,6 +1277,7 @@ rd_code_slice(RD_CodeSliceParams *params, TxtPt *cursor, TxtPt *mark, S64 *prefe
   B32 do_bp_lines = rd_setting_b32_from_name(str8_lit("breakpoint_lines"));
   B32 do_bp_glow = rd_setting_b32_from_name(str8_lit("breakpoint_glow"));
   B32 do_scope_lines = rd_setting_b32_from_name(str8_lit("cursor_scope_lines"));
+  B32 do_cursor_trail = rd_setting_b32_from_name(str8_lit("cursor_trail"));
   Vec4F32 pop_color = {0};
   UI_TagF("pop")
   {
@@ -2775,7 +2776,10 @@ rd_code_slice(RD_CodeSliceParams *params, TxtPt *cursor, TxtPt *mark, S64 *prefe
         {
           S64 column = cursor->column;
           Vec2F32 advance = fnt_dim_from_tag_size_string(line_box->font, line_box->font_size, 0, params->tab_size, str8_prefix(line_string, column-1));
+          F32 cursor_y = line_box->rect.y0-params->font_size*0.125f;
+          F32 cursor_y__animated = ui_anim(ui_key_from_stringf(text_container_box->key, "cursor_y_px"), cursor_y);
           F32 cursor_off_pixels = advance.x;
+          F32 cursor_off_pixels__animated = ui_anim(ui_key_from_stringf(text_container_box->key, "cursor_off_px"), cursor_off_pixels);
           F32 cursor_thickness = ClampBot(1.f, floor_f32(line_box->font_size/10.f));
           Rng2F32 cursor_rect =
           {
@@ -2784,12 +2788,39 @@ rd_code_slice(RD_CodeSliceParams *params, TxtPt *cursor, TxtPt *mark, S64 *prefe
             ui_box_text_position(line_box).x+cursor_off_pixels+cursor_thickness,
             line_box->rect.y1+params->font_size*0.125f,
           };
+          Rng1F32 trail_off_span = r1f32(cursor_off_pixels__animated, cursor_off_pixels);
+          Rng2F32 trail_rect =
+          {
+            ui_box_text_position(line_box).x+trail_off_span.min,
+            line_box->rect.y0-params->font_size*0.125f,
+            ui_box_text_position(line_box).x+trail_off_span.max,
+            line_box->rect.y1+params->font_size*0.125f,
+          };
           Vec4F32 cursor_color = ui_color_from_name(str8_lit("cursor"));
+          Vec4F32 trail_color = cursor_color;
           if(!is_focused)
           {
             cursor_color.w *= 0.5f;
           }
+          trail_color.w *= 0.25f;
           dr_rect(cursor_rect, cursor_color, 1.f, 0, 0.f);
+          if(do_cursor_trail)
+          {
+            R_Rect2DInst *trail_inst = dr_rect(trail_rect, trail_color, ui_top_font_size()*0.2f, 0, 1.f);
+            trail_inst->shear = cursor_y - cursor_y__animated;
+            if(cursor_off_pixels > cursor_off_pixels__animated)
+            {
+              trail_inst->dst = shift_2f32(trail_inst->dst, v2f32(0, -trail_inst->shear));
+              trail_inst->colors[Corner_00].w *= 0.1f;
+              trail_inst->colors[Corner_01].w *= 0.1f;
+            }
+            else
+            {
+              trail_inst->shear *= -1;
+              trail_inst->colors[Corner_10].w *= 0.1f;
+              trail_inst->colors[Corner_11].w *= 0.1f;
+            }
+          }
         }
         
         // rjf: extra rendering for lines with line-info that match the hovered

src/render/d3d11/generated/render_d3d11.meta.h

@@ -58,7 +58,7 @@ str8_lit_comp(
 "  float4 color10         : COL2;\n"
 "  float4 color11         : COL3;\n"
 "  float4 corner_radii_px : CRAD;\n"
-"  float4 style_params    : STY; // x: border_thickness_px, y: softness_px, z: omit_texture, w: unused\n"
+"  float4 style_params    : STY; // x: border_thickness_px, y: softness_px, z: omit_texture, w: shear\n"
 "  uint vertex_id         : SV_VertexID;\n"
 "};\n"
 "\n"
@@ -113,14 +113,15 @@ str8_lit_comp(
 "  float border_thickness_px = cpu2vertex.style_params.x;\n"
 "  float softness_px         = cpu2vertex.style_params.y;\n"
 "  float omit_texture        = cpu2vertex.style_params.z;\n"
+"  float shear_px            = cpu2vertex.style_params.w;\n"
 "  \n"
 "  //- rjf: prep per-vertex arrays to sample from (p: position, t: texcoord, c: colorcoord, r: cornerradius)\n"
 "  float2 dst_p_verts_px[] =\n"
 "  {\n"
 "    float2(dst_p0_px.x, dst_p1_px.y),\n"
 "    float2(dst_p0_px.x, dst_p0_px.y),\n"
-"    float2(dst_p1_px.x, dst_p1_px.y),\n"
+"    float2(dst_p1_px.x, dst_p1_px.y + shear_px),\n"
-"    float2(dst_p1_px.x, dst_p0_px.y),\n"
+"    float2(dst_p1_px.x, dst_p0_px.y + shear_px),\n"
 "  };\n"
 "  float2 src_p_verts_px[] =\n"
 "  {\n"

src/render/d3d11/render_d3d11.mdesk

@@ -56,7 +56,7 @@ struct CPU2Vertex
   float4 color10         : COL2;
   float4 color11         : COL3;
   float4 corner_radii_px : CRAD;
-  float4 style_params    : STY; // x: border_thickness_px, y: softness_px, z: omit_texture, w: unused
+  float4 style_params    : STY; // x: border_thickness_px, y: softness_px, z: omit_texture, w: shear
   uint vertex_id         : SV_VertexID;
 };
 
@@ -111,14 +111,15 @@ vs_main(CPU2Vertex cpu2vertex)
   float border_thickness_px = cpu2vertex.style_params.x;
   float softness_px         = cpu2vertex.style_params.y;
   float omit_texture        = cpu2vertex.style_params.z;
+  float shear_px            = cpu2vertex.style_params.w;
   
   //- rjf: prep per-vertex arrays to sample from (p: position, t: texcoord, c: colorcoord, r: cornerradius)
   float2 dst_p_verts_px[] =
   {
     float2(dst_p0_px.x, dst_p1_px.y),
     float2(dst_p0_px.x, dst_p0_px.y),
-    float2(dst_p1_px.x, dst_p1_px.y),
+    float2(dst_p1_px.x, dst_p1_px.y + shear_px),
-    float2(dst_p1_px.x, dst_p0_px.y),
+    float2(dst_p1_px.x, dst_p0_px.y + shear_px),
   };
   float2 src_p_verts_px[] =
   {

src/render/render_core.h

@@ -103,7 +103,7 @@ struct R_Rect2DInst
   F32 border_thickness;
   F32 edge_softness;
   F32 white_texture_override;
-  F32 _unused_[1];
+  F32 shear;
 };
 
 typedef struct R_Mesh3DInst R_Mesh3DInst;