Some threading fixes (prevents some dead-locks).

dlls/ddraw/d3ddevice/mesa.c

@@ -1667,6 +1667,8 @@ GL_IDirect3DDeviceImpl_7_3T_SetTextureStageState(LPDIRECT3DDEVICE7 iface,
 	This->state_block.texture_stage_state[dwStage][D3DTSS_ADDRESSV - 1] = dwState;
     }
 
+    ENTER_GL();
+    
     switch (d3dTexStageStateType) {
         case D3DTSS_MINFILTER:
         case D3DTSS_MIPFILTER:
@@ -2007,6 +2009,8 @@ GL_IDirect3DDeviceImpl_7_3T_SetTextureStageState(LPDIRECT3DDEVICE7 iface,
 	    break;
     }
 
+    LEAVE_GL();
+    
     return DD_OK;
 }
 
@@ -3016,7 +3020,9 @@ static void d3ddevice_flush_to_frame_buffer(IDirect3DDeviceImpl *d3d_dev, LPCREC
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, max_tex);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, min_tex);
     glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, tex_env);
+    LEAVE_GL();
     d3d_dev->matrices_updated(d3d_dev, TEXMAT0_CHANGED);
+    ENTER_GL();
 #if 0
     /* I keep this code here as it's very useful to debug :-) */
     {

dlls/ddraw/d3dtexture.c

@@ -723,6 +723,7 @@ gltex_bltfast(IDirectDrawSurfaceImpl *surf_ptr, DWORD dstx,
 		glReadBuffer(GL_BACK);
 	    else {
 		ERR("Wrong surface type for locking !\n");
+		glBindTexture(GL_TEXTURE_2D, cur_tex);
 		LEAVE_GL();
 		return DDERR_INVALIDPARAMS;
 	    }