ambient light for level (doesn't work with dynamic lights; I. WANT. SHADERS!)

[d2df-sdl.git] / src / engine / e_graphics.pas

diff --git a/src/engine/e_graphics.pas b/src/engine/e_graphics.pas
index 87b31a5b22dcaea9db8f8628a1d275266f896efe..ded85939193aaba22a8f569de903b4ed3dd94504 100644 (file)
--- a/src/engine/e_graphics.pas
+++ b/src/engine/e_graphics.pas
@@ -69,9 +69,12 @@ procedure e_DrawSizeMirror(ID: DWORD; X, Y: Integer; Alpha: Byte; AlphaChannel:
                            Blending: Boolean; Width, Height: Word; Mirror: TMirrorType = M_NONE);
 
 procedure e_DrawFill(ID: DWORD; X, Y: Integer; XCount, YCount: Word; Alpha: Integer;
-                     AlphaChannel: Boolean; Blending: Boolean);
+                     AlphaChannel: Boolean; Blending: Boolean; ambientBlendMode: Boolean=false);
 
-procedure e_DrawFillX (id: DWORD; x, y, wdt, hgt: Integer; alpha: Integer; alphachannel: Boolean; blending: Boolean; scale: Single);
+procedure e_DrawFillX (id: DWORD; x, y, wdt, hgt: Integer; alpha: Integer; alphachannel: Boolean;
+                       blending: Boolean; scale: Single; ambientBlendMode: Boolean=false);
+
+procedure e_AmbientQuad (x, y, w, h: Integer; r, g, b, a: Byte);
 
 procedure e_DrawPoint(Size: Byte; X, Y: Integer; Red, Green, Blue: Byte);
 procedure e_DrawLine(Width: Byte; X1, Y1, X2, Y2: Integer; Red, Green, Blue: Byte; Alpha: Byte = 0);
@@ -608,39 +611,35 @@ begin
 end;
 
 procedure e_DrawFill(ID: DWORD; X, Y: Integer; XCount, YCount: Word; Alpha: Integer;
-                     AlphaChannel: Boolean; Blending: Boolean);
+                     AlphaChannel: Boolean; Blending: Boolean; ambientBlendMode: Boolean=false);
 var
   X2, Y2, dx, w, h: Integer;
   u, v: Single;
 begin
   if e_NoGraphics then Exit;
   glColor4ub(e_Colors.R, e_Colors.G, e_Colors.B, 255);
+  ambientBlendMode := false;
 
-  if (Alpha > 0) or (AlphaChannel) or (Blending) then
-    glEnable(GL_BLEND)
+  if (Alpha > 0) or AlphaChannel or Blending then
+  begin
+    glEnable(GL_BLEND);
+  end
   else
-    glDisable(GL_BLEND);
-
-  if (AlphaChannel) or (Alpha > 0) then
-    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
-
-  if Alpha > 0 then
-    glColor4ub(e_Colors.R, e_Colors.G, e_Colors.B, 255-Alpha);
-
-  if Blending then
-    glBlendFunc(GL_SRC_ALPHA, GL_ONE);
-
-  if XCount = 0 then
-    XCount := 1;
+  begin
+    if not ambientBlendMode then glDisable(GL_BLEND);
+  end;
+  if AlphaChannel or (Alpha > 0) then glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+  if (Alpha > 0) then glColor4ub(e_Colors.R, e_Colors.G, e_Colors.B, 255-Alpha);
+  if Blending then glBlendFunc(GL_SRC_ALPHA, GL_ONE);
 
-  if YCount = 0 then
-    YCount := 1;
+  if (XCount = 0) then XCount := 1;
+  if (YCount = 0) then YCount := 1;
 
   glEnable(GL_TEXTURE_2D);
   glBindTexture(GL_TEXTURE_2D, e_Textures[ID].tx.id);
 
-  X2 := X + e_Textures[ID].tx.width * XCount;
-  Y2 := Y + e_Textures[ID].tx.height * YCount;
+  X2 := X+e_Textures[ID].tx.width*XCount;
+  Y2 := Y+e_Textures[ID].tx.height*YCount;
 
   //k8: this SHOULD work... i hope
   if (e_Textures[ID].tx.width = e_Textures[ID].tx.glwidth) and (e_Textures[ID].tx.height = e_Textures[ID].tx.glheight) then
@@ -707,7 +706,8 @@ begin
 end;
 
 
-procedure e_DrawFillX (id: DWORD; x, y, wdt, hgt: Integer; alpha: Integer; alphachannel: Boolean; blending: Boolean; scale: Single);
+procedure e_DrawFillX (id: DWORD; x, y, wdt, hgt: Integer; alpha: Integer; alphachannel: Boolean;
+                       blending: Boolean; scale: Single; ambientBlendMode: Boolean=false);
 var
   x2, y2: Integer;
   {
@@ -715,8 +715,9 @@ var
   scxywh: array[0..3] of GLint;
   vpxywh: array[0..3] of GLint;
   }
-  w, h, dw, cw, ch: Integer;
+  w, h, dw, cw, ch, yofs: Integer;
   u, v, cu, cv: Single;
+  onlyOneY: Boolean;
 
   {
   procedure setScissorGLInternal (x, y, w, h: Integer);
@@ -741,26 +742,28 @@ var
 
 begin
   if e_NoGraphics then exit;
+  ambientBlendMode := false;
 
   if (wdt < 1) or (hgt < 1) then exit;
 
   if (wdt mod e_Textures[ID].tx.width = 0) and (hgt mod e_Textures[ID].tx.height = 0) then
   begin
-    e_DrawFill(id, x, y, wdt div e_Textures[ID].tx.width, hgt div e_Textures[ID].tx.height, alpha, alphachannel, blending);
+    e_DrawFill(id, x, y, wdt div e_Textures[ID].tx.width, hgt div e_Textures[ID].tx.height, alpha, alphachannel, blending, ambientBlendMode);
     exit;
   end;
 
   glColor4ub(e_Colors.R, e_Colors.G, e_Colors.B, 255);
 
   if (Alpha > 0) or AlphaChannel or Blending then
-    glEnable(GL_BLEND)
+  begin
+    glEnable(GL_BLEND);
+  end
   else
-    glDisable(GL_BLEND);
-
+  begin
+    if not ambientBlendMode then glDisable(GL_BLEND);
+  end;
   if AlphaChannel or (Alpha > 0) then glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
-
   if (Alpha > 0) then glColor4ub(e_Colors.R, e_Colors.G, e_Colors.B, 255-Alpha);
-
   if Blending then glBlendFunc(GL_SRC_ALPHA, GL_ONE);
 
   glEnable(GL_TEXTURE_2D);
@@ -770,7 +773,7 @@ begin
   y2 := y+hgt;
 
   //k8: this SHOULD work... i hope
-  if (e_Textures[ID].tx.width = e_Textures[ID].tx.glwidth) and (e_Textures[ID].tx.height = e_Textures[ID].tx.glheight) then
+  if {false and} (e_Textures[ID].tx.width = e_Textures[ID].tx.glwidth) and (e_Textures[ID].tx.height = e_Textures[ID].tx.glheight) then
   begin
     glBegin(GL_QUADS);
       glTexCoord2f(0, hgt/e_Textures[ID].tx.height); glVertex2i(x,  y);
@@ -796,24 +799,26 @@ begin
     w := e_Textures[ID].tx.width;
     h := e_Textures[ID].tx.height;
     x2 := x;
+    if (hgt > h) then begin y += hgt-h; onlyOneY := false; end else onlyOneY := true;
     glBegin(GL_QUADS);
     while (hgt > 0) do
     begin
-      if (hgt >= h) then begin ch := h; cv := v; end else begin ch := hgt; cv := v/(h/hgt) end;
+      if (hgt >= h) then begin ch := h; cv := v; yofs := 0; end else begin ch := hgt; cv := v/(h/hgt); yofs := h-hgt; end;
+      if onlyOneY then yofs := 0;
       Dec(hgt, h);
       dw := wdt;
       x := x2;
       while (dw > 0) do
       begin
-        if (dw >= w) then begin cw := w; cu := u; end else begin cw := dw; cu := u/(w/dw) end;
+        if (dw >= w) then begin cw := w; cu := u; end else begin cw := dw; cu := u/(w/dw); end;
         Dec(dw, w);
-        glTexCoord2f(0, cv); glVertex2i(X,   Y);
-        glTexCoord2f(cu, cv); glVertex2i(X+cw, Y);
-        glTexCoord2f(cu, 0); glVertex2i(X+cw, Y+ch);
-        glTexCoord2f(0, 0); glVertex2i(X,   Y+ch);
+        glTexCoord2f(0, cv); glVertex2i(X,   Y+yofs);
+        glTexCoord2f(cu, cv); glVertex2i(X+cw, Y+yofs);
+        glTexCoord2f(cu, 0); glVertex2i(X+cw, Y+ch+yofs);
+        glTexCoord2f(0, 0); glVertex2i(X,   Y+ch+yofs);
         Inc(X, w);
       end;
-      Inc(Y, h);
+      Dec(Y, h);
     end;
     glEnd();
     //if wassc then glEnable(GL_SCISSOR_TEST) else glDisable(GL_SCISSOR_TEST);
@@ -823,6 +828,37 @@ begin
 end;
 
 
+procedure e_AmbientQuad (x, y, w, h: Integer; r, g, b, a: Byte);
+begin
+  if e_NoGraphics then exit;
+  if (w < 1) or (h < 1) then exit;
+  if (a <> 255) or ((r or g or b) <> 0) then
+  begin
+    glEnable(GL_BLEND);
+    glDisable(GL_TEXTURE_2D);
+    glColor4ub(r, g, b, a);
+    if ((r or g or b) <> 0) then
+    begin
+      glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+      glBegin(GL_QUADS);
+        glVertex2i(x, y);
+        glVertex2i(x+w, y);
+        glVertex2i(x+w, y+h);
+        glVertex2i(x, y+h);
+      glEnd();
+    end;
+    glBlendFunc(GL_ZERO, GL_SRC_ALPHA);
+    glBegin(GL_QUADS);
+      glVertex2i(x, y);
+      glVertex2i(x+w, y);
+      glVertex2i(x+w, y+h);
+      glVertex2i(x, y+h);
+    glEnd();
+    glDisable(GL_BLEND);
+  end;
+end;
+
+
 procedure e_DrawAdv(ID: DWORD; X, Y: Integer; Alpha: Byte; AlphaChannel: Boolean;
                     Blending: Boolean; Angle: Single; RC: PDFPoint; Mirror: TMirrorType = M_NONE);
 begin