st/wgl: add HUD support

v2: fix a few minor issues spotted by Jose.

Reviewed-by: José Fonseca <jfonseca@vmware.com>

src/gallium/state_trackers/wgl/stw_context.c

@@ -38,6 +38,7 @@
 #include "util/u_memory.h"
 #include "util/u_atomic.h"
 #include "state_tracker/st_api.h"
+#include "hud/hud_context.h"
 
 #include "stw_icd.h"
 #include "stw_device.h"
@@ -217,6 +218,10 @@ stw_create_context_attribs(
 
    ctx->st->st_manager_private = (void *) ctx;
 
+   if (ctx->st->cso_context) {
+      ctx->hud = hud_create(ctx->st->pipe, ctx->st->cso_context);
+   }
+
    pipe_mutex_lock( stw_dev->ctx_mutex );
    ctx->dhglrc = handle_table_add(stw_dev->ctx_table, ctx);
    pipe_mutex_unlock( stw_dev->ctx_mutex );
@@ -226,6 +231,9 @@ stw_create_context_attribs(
    return ctx->dhglrc;
 
 no_hglrc:
+   if (ctx->hud) {
+      hud_destroy(ctx->hud);
+   }
    ctx->st->destroy(ctx->st);
 no_st_ctx:
    FREE(ctx);
@@ -255,6 +263,10 @@ DrvDeleteContext(
       if (curctx == ctx)
          stw_dev->stapi->make_current(stw_dev->stapi, NULL, NULL, NULL);
 
+      if (ctx->hud) {
+         hud_destroy(ctx->hud);
+      }
+
       ctx->st->destroy(ctx->st);
       FREE(ctx);
 

src/gallium/state_trackers/wgl/stw_context.h

@@ -30,6 +30,7 @@
 
 #include <windows.h>
 
+struct hud_context;
 struct stw_framebuffer;
 struct st_context_iface;
 
@@ -41,6 +42,8 @@ struct stw_context
    HDC hdc;
 
    struct stw_framebuffer *current_framebuffer;
+
+   struct hud_context *hud;
 };
 
 DHGLRC stw_create_context_attribs( HDC hdc, INT iLayerPlane, DHGLRC hShareContext,

src/gallium/state_trackers/wgl/stw_framebuffer.c

@@ -31,6 +31,7 @@
 #include "pipe/p_screen.h"
 #include "util/u_format.h"
 #include "util/u_memory.h"
+#include "hud/hud_context.h"
 #include "state_tracker/st_api.h"
 
 #include "stw_icd.h"
@@ -593,6 +594,7 @@ BOOL APIENTRY
 DrvSwapBuffers(
    HDC hdc )
 {
+   struct stw_context *ctx;
    struct stw_framebuffer *fb;
 
    if (!stw_dev)
@@ -607,6 +609,14 @@ DrvSwapBuffers(
       return TRUE;
    }
 
+   /* Display the HUD */
+   ctx = stw_current_context();
+   if (ctx && ctx->hud) {
+      struct pipe_resource *back =
+         stw_get_framebuffer_resource(fb->stfb, ST_ATTACHMENT_BACK_LEFT);
+      hud_draw(ctx->hud, back);
+   }
+
    stw_flush_current_locked(fb);
 
    return stw_st_swap_framebuffer_locked(hdc, fb->stfb);

src/gallium/state_trackers/wgl/stw_st.c

@@ -263,6 +263,19 @@ stw_st_swap_framebuffer_locked(HDC hdc, struct st_framebuffer_iface *stfb)
    return stw_st_framebuffer_present_locked(hdc, &stwfb->base, front);
 }
 
+
+/**
+ * Return the pipe_resource that correspond to given buffer.
+ */
+struct pipe_resource *
+stw_get_framebuffer_resource(struct st_framebuffer_iface *stfb,
+                             enum st_attachment_type att)
+{
+   struct stw_st_framebuffer *stwfb = stw_st_framebuffer(stfb);
+   return stwfb->textures[att];
+}
+
+
 /**
  * Create an st_api of the state tracker.
  */

src/gallium/state_trackers/wgl/stw_st.h

@@ -46,4 +46,8 @@ stw_st_destroy_framebuffer_locked(struct st_framebuffer_iface *stfb);
 boolean
 stw_st_swap_framebuffer_locked(HDC hdc, struct st_framebuffer_iface *stfb);
 
+struct pipe_resource *
+stw_get_framebuffer_resource(struct st_framebuffer_iface *stfb,
+                             enum st_attachment_type att);
+
 #endif /* STW_ST_H */