Index: source/build/src/glsurface.cpp
===================================================================
--- a/source/build/src/glsurface.cpp	(revision 8090)
+++ b/source/build/src/glsurface.cpp	(working copy)
@@ -94,7 +94,7 @@
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, 1);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-    glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, bufferRes.x, bufferRes.y, 0, GL_RED, GL_UNSIGNED_BYTE, 0);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, bufferRes.x, bufferRes.y, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, 0);
 
     glsurface_setPalette(curpalettefaded);
 
@@ -227,7 +227,7 @@
         return;
 
     glActiveTexture(GL_TEXTURE0);
-    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, bufferRes.x, bufferRes.y, GL_RED, GL_UNSIGNED_BYTE, (void*) buffer);
+    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, bufferRes.x, bufferRes.y, GL_LUMINANCE, GL_UNSIGNED_BYTE, (void*) buffer);
 
     glDrawArrays(GL_TRIANGLE_STRIP,
                  0,
Index: source/build/src/polymost.cpp
===================================================================
--- a/source/build/src/polymost.cpp	(revision 8090)
+++ b/source/build/src/polymost.cpp	(working copy)
@@ -1874,11 +1874,11 @@
         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, 1);
 
-        glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, siz.y, siz.x, 0, GL_RED, GL_UNSIGNED_BYTE, (void*) tile);
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, siz.y, siz.x, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, (void*) tile);
     }
     else
     {
-        glTexSubImage2D(GL_TEXTURE_2D, 0, offset.x, offset.y, siz.y, siz.x, GL_RED, GL_UNSIGNED_BYTE, (void*) tile);
+        glTexSubImage2D(GL_TEXTURE_2D, 0, offset.x, offset.y, siz.y, siz.x, GL_LUMINANCE, GL_UNSIGNED_BYTE, (void*) tile);
     }
 }
 
@@ -1954,7 +1954,7 @@
         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, 1);
         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-        glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, PALSWAP_TEXTURE_SIZE, PALSWAP_TEXTURE_SIZE, 0, GL_RED, GL_UNSIGNED_BYTE, NULL);
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, PALSWAP_TEXTURE_SIZE, PALSWAP_TEXTURE_SIZE, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, NULL);
     }
 
     int32_t column = palookupnum%(PALSWAP_TEXTURE_SIZE/256);
@@ -1965,7 +1965,7 @@
         OSD_Printf("Polymost: palswaps are too large for palswap tilesheet!\n");
         return;
     }
-    glTexSubImage2D(GL_TEXTURE_2D, 0, 256*column, rowOffset, 256, numshades+1, GL_RED, GL_UNSIGNED_BYTE, palookup[palookupnum]);
+    glTexSubImage2D(GL_TEXTURE_2D, 0, 256*column, rowOffset, 256, numshades+1, GL_LUMINANCE, GL_UNSIGNED_BYTE, palookup[palookupnum]);
 }
 
 
Index: source/build/src/voxmodel.cpp
===================================================================
--- a/source/build/src/voxmodel.cpp	(revision 8090)
+++ b/source/build/src/voxmodel.cpp	(working copy)
@@ -60,7 +60,7 @@
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, 1);
 
-    glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, ysiz, xsiz, 0, GL_RED, GL_UNSIGNED_BYTE, (char *) pic2);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, ysiz, xsiz, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, (char *) pic2);
 
     Xfree(pic2);