Fix problem with initial viewport/scissor size.

If an app never called glViewport, the viewport size was always 0 by 0 pixels.
Now pass initial size to st_create_framebuffer() and initialize the viewport
and scissor bounds in st_make_current().
This could also be fixed by ensuring the gl_framebuffers passed to
_mesa_make_current() were initialized to the right size.  But that involves
allocating the renderbuffers/pipe_surfaces earlier and that runs into some
other issues ATM.
Also remove obsolete createRenderbuffers param to st_create_framebuffer().

src/mesa/drivers/dri/intel_winsys/intel_screen.c

@@ -297,10 +297,12 @@ intelCreateBuffer(__DRIscreenPrivate * driScrnPriv,
       else
          stencilFormat = PIPE_FORMAT_NONE;
 
-      intelfb->stfb = st_create_framebuffer(visual, GL_TRUE,
+      intelfb->stfb = st_create_framebuffer(visual,
                                             colorFormat,
                                             depthFormat,
                                             stencilFormat,
+                                            driDrawPriv->w,
+                                            driDrawPriv->h,
                                             (void*) intelfb);
       if (!intelfb->stfb) {
          free(intelfb);

src/mesa/pipe/xlib/xm_api.c

@@ -207,7 +207,7 @@ static GLboolean window_exists( XMesaDisplay *dpy, Window win )
 }
 
 static Status
-get_drawable_size( XMesaDisplay *dpy, Drawable d, GLuint *width, GLuint *height )
+get_drawable_size( XMesaDisplay *dpy, Drawable d, uint *width, uint *height )
 {
    Window root;
    Status stat;
@@ -323,6 +323,7 @@ create_xmesa_buffer(XMesaDrawable d, BufferType type,
    XMesaBuffer b;
    GLframebuffer *fb;
    enum pipe_format colorFormat, depthFormat, stencilFormat;
+   uint width, height;
 
    ASSERT(type == WINDOW || type == PIXMAP || type == PBUFFER);
 
@@ -359,11 +360,14 @@ create_xmesa_buffer(XMesaDrawable d, BufferType type,
    }
 
 
+   get_drawable_size(vis->display, d, &width, &height);
+
    /*
     * Create framebuffer, but we'll plug in our own renderbuffers below.
     */
-   b->stfb = st_create_framebuffer(&vis->mesa_visual, GL_TRUE,
+   b->stfb = st_create_framebuffer(&vis->mesa_visual,
                                    colorFormat, depthFormat, stencilFormat,
+                                   width, height,
                                    (void *) b);
    fb = &b->stfb->Base;
 

src/mesa/state_tracker/st_context.c

@@ -28,6 +28,8 @@
 #include "main/imports.h"
 #include "main/context.h"
 #include "main/extensions.h"
+#include "main/matrix.h"
+#include "main/buffers.h"
 #include "vbo/vbo.h"
 #include "shader/shader_api.h"
 #include "st_public.h"
@@ -163,7 +165,19 @@ void st_make_current(struct st_context *st,
                      struct st_framebuffer *read)
 {
    if (st) {
+      GLboolean firstTime = st->ctx->FirstTimeCurrent;
       _mesa_make_current(st->ctx, &draw->Base, &read->Base);
+      /* Need to initialize viewport here since draw->Base->Width/Height
+       * will still be zero at this point.
+       * This could be improved, but would require rather extensive work
+       * elsewhere (allocate rb surface storage sooner)
+       */
+      if (firstTime) {
+         GLuint w = draw->InitWidth, h = draw->InitHeight;
+         _mesa_set_viewport(st->ctx, 0, 0, w, h);
+         _mesa_set_scissor(st->ctx, 0, 0, w, h);
+
+      }
    }
    else {
       _mesa_make_current(NULL, NULL, NULL);

src/mesa/state_tracker/st_context.h

@@ -191,6 +191,7 @@ struct st_framebuffer
 {
    GLframebuffer Base;
    void *Private;
+   GLuint InitWidth, InitHeight;
 };
 
 

src/mesa/state_tracker/st_framebuffer.c

@@ -37,17 +37,16 @@
 
 struct st_framebuffer *
 st_create_framebuffer( const __GLcontextModes *visual,
-                       boolean createRenderbuffers, /* XXX remove? */
                        enum pipe_format colorFormat,
                        enum pipe_format depthFormat,
                        enum pipe_format stencilFormat,
+                       uint width, uint height,
                        void *private)
 {
    struct st_framebuffer *stfb = CALLOC_STRUCT(st_framebuffer);
    if (stfb) {
       _mesa_initialize_framebuffer(&stfb->Base, visual);
 
-      if (createRenderbuffers) {
       {
          /* fake frontbuffer */
          /* XXX allocation should only happen in the unusual case
@@ -107,10 +106,10 @@ st_create_framebuffer( const __GLcontextModes *visual,
             = st_new_renderbuffer_fb(PIPE_FORMAT_R16G16B16A16_SNORM);
          _mesa_add_renderbuffer(&stfb->Base, BUFFER_ACCUM, accumRb);
       }
-      }
 
       stfb->Base.Initialized = GL_TRUE;
-
+      stfb->InitWidth = width;
+      stfb->InitHeight = height;
       stfb->Private = private;
    }
    return stfb;

src/mesa/state_tracker/st_public.h

@@ -55,10 +55,10 @@ void st_copy_context_state(struct st_context *dst, struct st_context *src,
                            uint mask);
 
 struct st_framebuffer *st_create_framebuffer( const __GLcontextModes *visual,
-                                              boolean createRenderbuffers,
                                               enum pipe_format colorFormat,
                                               enum pipe_format depthFormat,
                                               enum pipe_format stencilFormat,
+                                              uint width, uint height,
                                               void *privateData);
 
 void st_resize_framebuffer( struct st_framebuffer *stfb,