3 files changed, 16 insertions, 12 deletions

diff --git a/src/mesa/main/context.c b/src/mesa/main/context.c
index 5c67159e5a9..5af0c02cfa9 100644
--- a/src/mesa/main/context.c
+++ b/src/mesa/main/context.c
@@ -1437,7 +1437,7 @@ _mesa_check_init_viewport(struct gl_context *ctx, GLuint width, GLuint height)
        * potential infinite recursion.
        */
       ctx->ViewportInitialized = GL_TRUE;
-      _mesa_set_viewport(ctx, 0, 0, width, height);
+      _mesa_set_viewport(ctx, 0, 0, 0, width, height);
       _mesa_set_scissor(ctx, 0, 0, width, height);
    }
 }
diff --git a/src/mesa/main/viewport.c b/src/mesa/main/viewport.c
index 360f066a966..d4b03936610 100644
--- a/src/mesa/main/viewport.c
+++ b/src/mesa/main/viewport.c
@@ -57,7 +57,7 @@ _mesa_Viewport(GLint x, GLint y, GLsizei width, GLsizei height)
       return;
    }
 
-   _mesa_set_viewport(ctx, x, y, width, height);
+   _mesa_set_viewport(ctx, 0, x, y, width, height);
 }
 
 
@@ -66,22 +66,23 @@ _mesa_Viewport(GLint x, GLint y, GLsizei width, GLsizei height)
  * matrix).  Usually called from _mesa_Viewport().
  * 
  * \param ctx GL context.
+ * \param idx    Index of the viewport to be updated.
  * \param x, y coordinates of the lower left corner of the viewport rectangle.
  * \param width width of the viewport rectangle.
  * \param height height of the viewport rectangle.
  */
 void
-_mesa_set_viewport(struct gl_context *ctx, GLint x, GLint y,
+_mesa_set_viewport(struct gl_context *ctx, unsigned idx, GLint x, GLint y,
                     GLsizei width, GLsizei height)
 {
    /* clamp width and height to the implementation dependent range */
    width  = MIN2(width, (GLsizei) ctx->Const.MaxViewportWidth);
    height = MIN2(height, (GLsizei) ctx->Const.MaxViewportHeight);
 
-   ctx->ViewportArray[0].X = x;
-   ctx->ViewportArray[0].Width = width;
-   ctx->ViewportArray[0].Y = y;
-   ctx->ViewportArray[0].Height = height;
+   ctx->ViewportArray[idx].X = x;
+   ctx->ViewportArray[idx].Width = width;
+   ctx->ViewportArray[idx].Y = y;
+   ctx->ViewportArray[idx].Height = height;
    ctx->NewState |= _NEW_VIEWPORT;
 
 #if 1
@@ -89,10 +90,13 @@ _mesa_set_viewport(struct gl_context *ctx, GLint x, GLint y,
     * the WindowMap matrix being up to date in the driver's Viewport
     * and DepthRange functions.
     */
-   _math_matrix_viewport(&ctx->ViewportArray[0]._WindowMap,
-                         ctx->ViewportArray[0].X, ctx->ViewportArray[0].Y,
-                         ctx->ViewportArray[0].Width, ctx->ViewportArray[0].Height,
-                         ctx->ViewportArray[0].Near, ctx->ViewportArray[0].Far,
+   _math_matrix_viewport(&ctx->ViewportArray[idx]._WindowMap,
+                         ctx->ViewportArray[idx].X,
+                         ctx->ViewportArray[idx].Y,
+                         ctx->ViewportArray[idx].Width,
+                         ctx->ViewportArray[idx].Height,
+                         ctx->ViewportArray[idx].Near,
+                         ctx->ViewportArray[idx].Far,
                          ctx->DrawBuffer->_DepthMaxF);
 #endif
 
diff --git a/src/mesa/main/viewport.h b/src/mesa/main/viewport.h
index ffa3a729ce0..b4eb5217cd1 100644
--- a/src/mesa/main/viewport.h
+++ b/src/mesa/main/viewport.h
@@ -36,7 +36,7 @@ _mesa_Viewport(GLint x, GLint y, GLsizei width, GLsizei height);
 
 
 extern void 
-_mesa_set_viewport(struct gl_context *ctx, GLint x, GLint y,
+_mesa_set_viewport(struct gl_context *ctx, unsigned idx, GLint x, GLint y,
                    GLsizei width, GLsizei height);