From 385f70688f69aba255d1cdb9b7f0717bfe1b6945 Mon Sep 17 00:00:00 2001
From: DeaDDooMER <deaddoomer@deadsoftware.ru>
Date: Tue, 20 Feb 2018 18:08:41 +0300
Subject: [PATCH] Reimplemented lines and particles rendering with nanoGL

---
 src/engine/e_graphics.pas | 16 +++++++++++--
 src/game/g_gfx.pas        | 50 +++++++++++++++++++++++++++++++++++----
 2 files changed, 59 insertions(+), 7 deletions(-)

diff --git a/src/engine/e_graphics.pas b/src/engine/e_graphics.pas
index b78a175..18e4c1a 100644
--- a/src/engine/e_graphics.pas
+++ b/src/engine/e_graphics.pas
@@ -1085,8 +1085,11 @@ end;
 
 
 procedure e_DrawLine(Width: Byte; X1, Y1, X2, Y2: Integer; Red, Green, Blue: Byte; Alpha: Byte = 0);
+{$IFDEF USE_NANOGL}
+  var
+    v: array [0..3] of GLfloat;
+{$ENDIF}
 begin
-{$IFNDEF USE_NANOGL} // FIXIT: nanoGL doesn't support glBegin(GL_LINES)
   if e_NoGraphics then Exit;
   // Pixel-perfect lines
   if Width = 1 then
@@ -1103,15 +1106,24 @@ begin
   glColor4ub(Red, Green, Blue, 255-Alpha);
   glLineWidth(Width);
 
+{$IFDEF USE_NANOGL}
+  v[0] := X1; v[1] := Y1; v[2] := X2; v[3] := Y2;
+  glVertexPointer(2, GL_FLOAT, 0, @v[0]);
+  glEnableClientState(GL_VERTEX_ARRAY);
+  glDisableClientState(GL_COLOR_ARRAY);
+  glDisableClientState(GL_NORMAL_ARRAY);
+  glDisableClientState(GL_TEXTURE_COORD_ARRAY);
+  glDrawArrays(GL_LINES, 0, 4);
+{$ELSE}
   glBegin(GL_LINES);
     glVertex2i(X1, Y1);
     glVertex2i(X2, Y2);
   glEnd();
+{$ENDIF}
 
   glColor4ub(e_Colors.R, e_Colors.G, e_Colors.B, 255);
 
   glDisable(GL_BLEND);
-{$ENDIF}
 end;
 
 //------------------------------------------------------------------
diff --git a/src/game/g_gfx.pas b/src/game/g_gfx.pas
index 0f26212..01ada52 100644
--- a/src/game/g_gfx.pas
+++ b/src/game/g_gfx.pas
@@ -1469,9 +1469,6 @@ procedure g_GFX_SetMax (count: Integer);
 var
   a: Integer;
 begin
-{$IFDEF USE_NANOGL} // FIXIT: nanoGL doesn't support glBegin(GL_POINTS)
-  count := 0;
-{$ENDIF}
   if count > 50000 then count := 50000;
   if (count < 1) then count := 1;
   SetLength(Particles, count);
@@ -1627,8 +1624,19 @@ end;
 
 
 procedure g_GFX_Draw ();
-var
-  a, len: Integer;
+  var
+    a, len: Integer;
+{$IFDEF USE_NANOGL}
+  type
+    PVertex = ^Vertex;
+    Vertex = record
+      x, y: GLfloat;
+      r, g, b, a: GLfloat;
+    end;
+  var
+    count: Integer;
+    v: PVertex;
+{$ENDIF}
 begin
   if not gpart_dbg_enabled then exit;
 
@@ -1643,6 +1651,37 @@ begin
     glEnable(GL_BLEND);
     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 
+{$IFDEF USE_NANOGL}
+    len := High(Particles);
+    v := GetMem(len * SizeOf(Vertex) + 1);
+    count := 0;
+    for a := 0 to len do
+    begin
+      with Particles[a] do
+      begin
+        if alive and (x >= sX) and (y >= sY) and (x <= sX + sWidth) and (sY <= sY + sHeight) then
+        begin
+          v[count].x := x + 0.37;
+          v[count].y := y + 0.37;
+          v[count].r := red / 255;
+          v[count].g := green / 255;
+          v[count].b := blue / 255;
+          v[count].a := alpha / 255;
+          Inc(count);
+        end;
+      end;
+    end;
+
+    glVertexPointer(2, GL_FLOAT, SizeOf(Vertex), @v.x);
+    glColorPointer(4, GL_FLOAT, SizeOf(Vertex), @v.r);
+    glEnableClientState(GL_VERTEX_ARRAY);
+    glEnableClientState(GL_COLOR_ARRAY);
+    glDisableClientState(GL_NORMAL_ARRAY);
+    glDisableClientState(GL_TEXTURE_COORD_ARRAY);
+    glDrawArrays(GL_POINTS, 0, count - 1);
+
+    Dispose(v);
+{$ELSE}
     glBegin(GL_POINTS);
 
     len := High(Particles);
@@ -1660,6 +1699,7 @@ begin
     end;
 
     glEnd();
+{$ENDIF}
 
     glDisable(GL_BLEND);
   end;
-- 
2.29.2