From a702bbfff3a53db4e9183bdeda15333a52af1fc5 Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Wed, 14 Sep 2005 03:11:36 +0000
Subject: clean-up some _mesa_make_current() code

---
 src/mesa/main/context.c | 67 +++++++++++++++++++++++--------------------------
 1 file changed, 32 insertions(+), 35 deletions(-)

diff --git a/src/mesa/main/context.c b/src/mesa/main/context.c
index cc29f2cb99..f51adb59da 100644
--- a/src/mesa/main/context.c
+++ b/src/mesa/main/context.c
@@ -1500,23 +1500,36 @@ check_compatible(const GLcontext *ctx, const GLframebuffer *buffer)
 
 
 /**
- * Bind the given context to the given draw-buffer and read-buffer and
- * make it the current context for this thread.
+ * Do one-time initialization for the given framebuffer.  Specifically,
+ * ask the driver for the window's current size and update the framebuffer
+ * object to match.
+ * Really, the device driver should totally take care of this.
+ */
+static void
+initialize_framebuffer_size(GLcontext *ctx, GLframebuffer *fb)
+{
+   GLuint width, height;
+   ASSERT(ctx->Driver.GetBufferSize);
+   ctx->Driver.GetBufferSize(fb, &width, &height);
+   if (ctx->Driver.ResizeBuffers)
+      ctx->Driver.ResizeBuffers(ctx, fb, width, height);
+   fb->Initialized = GL_TRUE;
+}
+
+
+/**
+ * Bind the given context to the given drawBuffer and readBuffer and
+ * make it the current context for the calling thread.
+ * We'll render into the drawBuffer and read pixels from the
+ * readBuffer (i.e. glRead/CopyPixels, glCopyTexImage, etc).
  *
- * \param newCtx new GL context. If NULL then there will be no current GL
- * context.
- * \param drawBuffer draw framebuffer.
- * \param readBuffer read framebuffer.
- * 
- * Check that the context's and framebuffer's visuals are compatible, returning
- * immediately otherwise. Sets the glapi current context via
- * _glapi_set_context(). If \p newCtx is not NULL, associates \p drawBuffer and
- * \p readBuffer with it and calls dd_function_table::ResizeBuffers if the buffers size has changed. 
- * Calls dd_function_table::MakeCurrent callback if defined.
+ * We check that the context's and framebuffer's visuals are compatible
+ * and return immediately if they're not.
  *
- * When a context is bound by the first time and the \c MESA_INFO environment
- * variable is set it calls print_info() as an aid for remote user
- * troubleshooting.
+ * \param newCtx  the new GL context. If NULL then there will be no current GL
+ *                context.
+ * \param drawBuffer  the drawing framebuffer
+ * \param readBuffer  the reading framebuffer
  */
 void
 _mesa_make_current( GLcontext *newCtx, GLframebuffer *drawBuffer,
@@ -1570,32 +1583,16 @@ _mesa_make_current( GLcontext *newCtx, GLframebuffer *drawBuffer,
 
 #if _HAVE_FULL_GL
          if (!drawBuffer->Initialized) {
-            /* get initial window size */
-            GLuint bufWidth, bufHeight;
-            /* ask device driver for size of the buffer */
-            (*newCtx->Driver.GetBufferSize)(drawBuffer, &bufWidth, &bufHeight);
-            /* set initial buffer size */
-            if (newCtx->Driver.ResizeBuffers)
-               newCtx->Driver.ResizeBuffers(newCtx, drawBuffer,
-                                            bufWidth, bufHeight);
-            drawBuffer->Initialized = GL_TRUE;
+            initialize_framebuffer_size(newCtx, drawBuffer);
          }
-
          if (readBuffer != drawBuffer && !readBuffer->Initialized) {
-            /* get initial window size */
-            GLuint bufWidth, bufHeight;
-            /* ask device driver for size of the buffer */
-            (*newCtx->Driver.GetBufferSize)(readBuffer, &bufWidth, &bufHeight);
-            /* set initial buffer size */
-            if (newCtx->Driver.ResizeBuffers)
-               newCtx->Driver.ResizeBuffers(newCtx, readBuffer,
-                                            bufWidth, bufHeight);
-            readBuffer->Initialized = GL_TRUE;
+            initialize_framebuffer_size(newCtx, readBuffer);
          }
 #endif
          if (newCtx->FirstTimeCurrent) {
             /* set initial viewport and scissor size now */
-            _mesa_set_viewport(newCtx, 0, 0, drawBuffer->Width, drawBuffer->Height);
+            _mesa_set_viewport(newCtx, 0, 0,
+                               drawBuffer->Width, drawBuffer->Height);
             newCtx->Scissor.Width = drawBuffer->Width;
             newCtx->Scissor.Height = drawBuffer->Height;
          }
-- 
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