- fix for rendering a brightmapped 2D texture with ColorIsFixed render style.

This must disable the brightmap.

src/gl/renderer/gl_renderer.cpp

@@ -767,6 +767,7 @@ void FGLRenderer::Draw2D(F2DDrawer *drawer)
 		gl_GetRenderStyle(cmd.mRenderStyle, false, false, &tm, &sb, &db, &be);
 		gl_RenderState.BlendEquation(be); 
 		gl_RenderState.BlendFunc(sb, db);
+		gl_RenderState.EnableBrightmap(!(cmd.mRenderStyle.Flags & STYLEF_ColorIsFixed));
 
 		// Rather than adding remapping code, let's enforce that the constants here are equal.
 		static_assert(int(F2DDrawer::DTM_Normal) == int(TM_MODULATE), "DTM_Normal != TM_MODULATE");
@@ -878,6 +879,7 @@ void FGLRenderer::Draw2D(F2DDrawer *drawer)
 
 	gl_RenderState.SetVertexBuffer(GLRenderer->mVBO);
 	gl_RenderState.EnableTexture(true);
+	gl_RenderState.EnableBrightmap(true);
 	gl_RenderState.SetTextureMode(TM_MODULATE);
 	gl_RenderState.SetFixedColormap(CM_DEFAULT);
 	gl_RenderState.ResetColor();

src/hwrenderer/scene/hw_weapon.cpp

@@ -212,6 +212,22 @@ WeaponLighting GetWeaponLighting(sector_t *viewsector, const DVector3 &pos, int
 	return l;
 }
 
+void WeaponLighting::SetBright()
+{
+	if (!isbelow)
+	{
+		cm.MakeWhite();
+	}
+	else
+	{
+		// under water areas keep most of their color for fullbright objects
+		cm.LightColor.r = (3 * cm.LightColor.r + 0xff) / 4;
+		cm.LightColor.g = (3 * cm.LightColor.g + 0xff) / 4;
+		cm.LightColor.b = (3 * cm.LightColor.b + 0xff) / 4;
+	}
+	lightlevel = 255;
+}
+
 //==========================================================================
 //
 // Render Style

src/hwrenderer/scene/hw_weapon.h

@@ -19,6 +19,8 @@ struct WeaponLighting
 	FColormap cm;
 	int lightlevel;
 	bool isbelow;
+
+	void SetBright();
 };
 
 struct WeaponRenderStyle