wgl: More complete WGL_ARB_pbuffer support.

4 files changed, 169 insertions, 11 deletions

diff --git a/src/gallium/state_trackers/wgl/stw_device.c b/src/gallium/state_trackers/wgl/stw_device.c
index 37809d084ce..7227dc276ab 100644
--- a/src/gallium/state_trackers/wgl/stw_device.c
+++ b/src/gallium/state_trackers/wgl/stw_device.c
@@ -96,6 +96,10 @@ stw_init(const struct stw_winsys *stw_winsys)
    stw_dev->smapi->get_param = stw_get_param;
    stw_dev->screen = screen;
 
+   stw_dev->max_2d_levels =
+         screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS);
+   stw_dev->max_2d_length = 1 << (stw_dev->max_2d_levels - 1);
+
    pipe_mutex_init( stw_dev->ctx_mutex );
    pipe_mutex_init( stw_dev->fb_mutex );
 
diff --git a/src/gallium/state_trackers/wgl/stw_device.h b/src/gallium/state_trackers/wgl/stw_device.h
index 1b836960d0d..3c2b6d9c076 100644
--- a/src/gallium/state_trackers/wgl/stw_device.h
+++ b/src/gallium/state_trackers/wgl/stw_device.h
@@ -50,6 +50,10 @@ struct stw_device
    
    struct pipe_screen *screen;
    
+   /* Cache some PIPE_CAP_* */
+   unsigned max_2d_levels;
+   unsigned max_2d_length;
+
    struct st_api *stapi;
    struct st_manager *smapi;
 
diff --git a/src/gallium/state_trackers/wgl/stw_ext_pbuffer.c b/src/gallium/state_trackers/wgl/stw_ext_pbuffer.c
index 0866d41d718..32636c603dc 100644
--- a/src/gallium/state_trackers/wgl/stw_ext_pbuffer.c
+++ b/src/gallium/state_trackers/wgl/stw_ext_pbuffer.c
@@ -32,24 +32,132 @@
 #include <GL/gl.h>
 #include <GL/wglext.h>
 
+#include "pipe/p_defines.h"
+#include "pipe/p_screen.h"
+
+#include "stw_device.h"
+#include "stw_pixelformat.h"
+#include "stw_framebuffer.h"
+
 
 HPBUFFERARB WINAPI
-wglCreatePbufferARB(HDC hDC,
+wglCreatePbufferARB(HDC _hDC,
                     int iPixelFormat,
                     int iWidth,
                     int iHeight,
                     const int *piAttribList)
 {
-   /* FIXME */
-   return NULL;
+   static boolean first = TRUE;
+   const int *piAttrib;
+   int useLargest = 0;
+   const struct stw_pixelformat_info *info;
+   struct stw_framebuffer *fb;
+   HWND hWnd;
+   HDC hDC;
+
+   info = stw_pixelformat_get_info(iPixelFormat);
+   if (!info) {
+      SetLastError(ERROR_INVALID_PIXEL_FORMAT);
+      return 0;
+   }
+
+   if (iWidth <= 0 || iHeight <= 0) {
+      SetLastError(ERROR_INVALID_DATA);
+      return 0;
+   }
+
+   for (piAttrib = piAttribList; *piAttrib; piAttrib++) {
+      switch (*piAttrib) {
+      case WGL_PBUFFER_LARGEST_ARB:
+         piAttrib++;
+         useLargest = *piAttrib;
+         break;
+      default:
+         SetLastError(ERROR_INVALID_DATA);
+         return 0;
+      }
+   }
+
+   if (iWidth > stw_dev->max_2d_length) {
+      if (useLargest) {
+         iWidth = stw_dev->max_2d_length;
+      } else {
+         SetLastError(ERROR_NO_SYSTEM_RESOURCES);
+         return 0;
+      }
+   }
+
+   if (iHeight > stw_dev->max_2d_length) {
+      if (useLargest) {
+         iHeight = stw_dev->max_2d_length;
+      } else {
+         SetLastError(ERROR_NO_SYSTEM_RESOURCES);
+         return 0;
+      }
+   }
+
+   /*
+    * Implement pbuffers through invisible windows
+    */
+
+   if (first) {
+      WNDCLASS wc;
+      memset(&wc, 0, sizeof wc);
+      wc.hbrBackground = (HBRUSH) (COLOR_BTNFACE + 1);
+      wc.hCursor = LoadCursor(NULL, IDC_ARROW);
+      wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
+      wc.lpfnWndProc = DefWindowProc;
+      wc.lpszClassName = "wglpbuffer";
+      wc.style = CS_OWNDC | CS_HREDRAW | CS_VREDRAW;
+      RegisterClass(&wc);
+      first = FALSE;
+   }
+
+   hWnd = CreateWindowEx(0,
+                         "wglpbuffer", /* wc.lpszClassName */
+                         "wglpbuffer",
+#if 0 /* Useful for debugging what the application is drawing */
+                         WS_VISIBLE |
+#endif
+                         WS_CLIPSIBLINGS | WS_CLIPCHILDREN,
+                         CW_USEDEFAULT, CW_USEDEFAULT, /* x, y */
+                         iWidth, iHeight,
+                         NULL,
+                         NULL,
+                         NULL,
+                         NULL);
+   if (!hWnd) {
+      return 0;
+   }
+
+   hDC = GetDC(hWnd);
+   if (!hDC) {
+      return 0;
+   }
+
+   SetPixelFormat(hDC, iPixelFormat, &info->pfd);
+
+   fb = stw_framebuffer_create(hDC, iPixelFormat);
+   if (!fb) {
+      SetLastError(ERROR_NO_SYSTEM_RESOURCES);
+   }
+
+   return (HPBUFFERARB)fb;
 }
 
 
 HDC WINAPI
 wglGetPbufferDCARB(HPBUFFERARB hPbuffer)
 {
-   /* FIXME */
-   return NULL;
+   struct stw_framebuffer *fb;
+   HDC hDC;
+
+   fb = (struct stw_framebuffer *)hPbuffer;
+
+   hDC = GetDC(fb->hWnd);
+   SetPixelFormat(hDC, fb->iPixelFormat, &fb->pfi->pfd);
+
+   return hDC;
 }
 
 
@@ -57,16 +165,23 @@ int WINAPI
 wglReleasePbufferDCARB(HPBUFFERARB hPbuffer,
                        HDC hDC)
 {
-   /* FIXME */
-   return 0;
+   struct stw_framebuffer *fb;
+
+   fb = (struct stw_framebuffer *)hPbuffer;
+
+   return ReleaseDC(fb->hWnd, hDC);
 }
 
 
 BOOL WINAPI
 wglDestroyPbufferARB(HPBUFFERARB hPbuffer)
 {
-   /* FIXME */
-   return FALSE;
+   struct stw_framebuffer *fb;
+
+   fb = (struct stw_framebuffer *)hPbuffer;
+
+   /* This will destroy all our data */
+   return DestroyWindow(fb->hWnd);
 }
 
 
@@ -75,6 +190,23 @@ wglQueryPbufferARB(HPBUFFERARB hPbuffer,
                    int iAttribute,
                    int *piValue)
 {
-   /* FIXME */
-   return FALSE;
+   struct stw_framebuffer *fb;
+
+   fb = (struct stw_framebuffer *)hPbuffer;
+
+   switch (iAttribute) {
+   case WGL_PBUFFER_WIDTH_ARB:
+      *piValue = fb->width;
+      return TRUE;
+   case WGL_PBUFFER_HEIGHT_ARB:
+      *piValue = fb->width;
+      return TRUE;
+   case WGL_PBUFFER_LOST_ARB:
+      /* We assume that no content is ever lost due to display mode change */
+      *piValue = FALSE;
+      return TRUE;
+   default:
+      SetLastError(ERROR_INVALID_DATA);
+      return FALSE;
+   }
 }
diff --git a/src/gallium/state_trackers/wgl/stw_ext_pixelformat.c b/src/gallium/state_trackers/wgl/stw_ext_pixelformat.c
index ab56800e28d..d0a95863bb4 100644
--- a/src/gallium/state_trackers/wgl/stw_ext_pixelformat.c
+++ b/src/gallium/state_trackers/wgl/stw_ext_pixelformat.c
@@ -43,6 +43,7 @@
 
 #include "pipe/p_compiler.h"
 #include "util/u_memory.h"
+#include "stw_device.h"
 #include "stw_pixelformat.h"
 
 
@@ -234,6 +235,23 @@ stw_query_attrib(
       *pvalue = pfi->stvis.samples;
       break;
 
+
+   /* WGL_ARB_pbuffer */
+
+   case WGL_MAX_PBUFFER_WIDTH_ARB:
+   case WGL_MAX_PBUFFER_HEIGHT_ARB:
+      *pvalue = stw_dev->max_2d_length;
+      break;
+
+   case WGL_MAX_PBUFFER_PIXELS_ARB:
+      *pvalue = stw_dev->max_2d_length * stw_dev->max_2d_length;
+      break;
+
+   case WGL_DRAW_TO_PBUFFER_ARB:
+      *pvalue = 1;
+      break;
+
+
    default:
       return FALSE;
    }