[PATCH 1/2] glx/swrast: Do more GLX extension setup

[Adam Jackson]

This gets you nice things like core contexts when using Xvfb.

Also, no, MESA_copy_sub_buffer is not enabled automatically.

Signed-off-by: Adam Jackson <ajax at redhat.com>
---
 glx/glxdriswrast.c | 37 ++++++++++++++++++++++++++++++++++---
 1 file changed, 34 insertions(+), 3 deletions(-)

diff --git a/glx/glxdriswrast.c b/glx/glxdriswrast.c
index 5d9aa04..e25ca47 100644
--- a/glx/glxdriswrast.c
+++ b/glx/glxdriswrast.c
@@ -71,6 +71,8 @@ struct __GLXDRIscreen {
     const __DRIcopySubBufferExtension *copySubBuffer;
     const __DRItexBufferExtension *texBuffer;
     const __DRIconfig **driConfigs;
+
+    unsigned char glx_enable_bits[__GLX_EXT_BYTES];
 };
 
 struct __GLXDRIcontext {
@@ -394,21 +396,34 @@ initializeExtensions(__GLXDRIscreen * screen)
     const __DRIextension **extensions;
     int i;
 
+    if (screen->swrast->base.version >= 3) {
+        __glXEnableExtension(screen->glx_enable_bits,
+                             "GLX_ARB_create_context");
+        __glXEnableExtension(screen->glx_enable_bits,
+                             "GLX_ARB_create_context_profile");
+        __glXEnableExtension(screen->glx_enable_bits,
+                             "GLX_EXT_create_context_es2_profile");
+    }
+
+    /* these are harmless to enable unconditionally */
+    __glXEnableExtension(screen->glx_enable_bits, "GLX_EXT_framebuffer_sRGB");
+    __glXEnableExtension(screen->glx_enable_bits, "GLX_ARB_fbconfig_float");
+    __glXEnableExtension(screen->glx_enable_bits, "GLX_SGI_make_current_read");
+
     extensions = screen->core->getExtensions(screen->driScreen);
 
     for (i = 0; extensions[i]; i++) {
         if (strcmp(extensions[i]->name, __DRI_COPY_SUB_BUFFER) == 0) {
             screen->copySubBuffer =
                 (const __DRIcopySubBufferExtension *) extensions[i];
-            /* GLX_MESA_copy_sub_buffer is always enabled. */
+            __glXEnableExtension(screen->glx_enable_bits,
+                                 "GLX_MESA_copy_sub_buffer");
         }
 
         if (strcmp(extensions[i]->name, __DRI_TEX_BUFFER) == 0) {
             screen->texBuffer = (const __DRItexBufferExtension *) extensions[i];
             /* GLX_EXT_texture_from_pixmap is always enabled. */
         }
-
-        /* Ignore unknown extensions */
     }
 }
 
@@ -420,6 +435,7 @@ __glXDRIscreenProbe(ScreenPtr pScreen)
 {
     const char *driverName = "swrast";
     __GLXDRIscreen *screen;
+    size_t buffer_size;
 
     screen = calloc(1, sizeof *screen);
     if (screen == NULL)
@@ -431,6 +447,8 @@ __glXDRIscreenProbe(ScreenPtr pScreen)
     screen->base.swapInterval = NULL;
     screen->base.pScreen = pScreen;
 
+    __glXInitExtensionEnableBits(screen->glx_enable_bits);
+
     screen->driver = glxProbeDriver(driverName,
                                     (void **) &screen->core,
                                     __DRI_CORE, 1,
@@ -459,6 +477,19 @@ __glXDRIscreenProbe(ScreenPtr pScreen)
 
     __glXScreenInit(&screen->base, pScreen);
 
+    /* The first call simply determines the length of the extension string.
+     * This allows us to allocate some memory to hold the extension string,
+     * but it requires that we call __glXGetExtensionString a second time.
+     */
+    buffer_size = __glXGetExtensionString(screen->glx_enable_bits, NULL);
+    if (buffer_size > 0) {
+        free(screen->base.GLXextensions);
+
+        screen->base.GLXextensions = xnfalloc(buffer_size);
+        (void) __glXGetExtensionString(screen->glx_enable_bits,
+                                       screen->base.GLXextensions);
+    }
+
     screen->base.GLXmajor = 1;
     screen->base.GLXminor = 4;
 
-- 
2.4.0