Work In Progress. Move some of the frame buffer, render buffer, etc init code from the create context path to the make current path, where it is lazily initialized. This didn't buy me very much except to make it look closer to the X11 driver. Fix up some of this same code to correct some errors.

The next step is to reorganize the wmesa context data structure to inherit the gl_context by containment so I can have access to the wmesa context in the update state path.  The driver is still currently not responding to changes in the Draw and Read Buffer state.

2 files changed, 164 insertions, 102 deletions

diff --git a/src/mesa/drivers/windows/gdi/wmesa.c b/src/mesa/drivers/windows/gdi/wmesa.c
index cc68fe622a..09da82e6db 100644
--- a/src/mesa/drivers/windows/gdi/wmesa.c
+++ b/src/mesa/drivers/windows/gdi/wmesa.c
@@ -40,7 +40,7 @@ static void wmSetPixelFormat(PWMC pwc, HDC hDC)
 {
     pwc->cColorBits = GetDeviceCaps(hDC, BITSPIXEL);
 
-    // TEMP - only 16 and 32 bit targets are supported now
+    // Only 16 and 32 bit targets are supported now
     assert(pwc->cColorBits == 16 || 
 	   pwc->cColorBits == 32);
 
@@ -323,7 +323,7 @@ static void clear(GLcontext* ctx,
 	HBRUSH Old_Brush = SelectObject(DC, Current->clearBrush);
 	Rectangle(DC,
 		  x,
-		  FLIP(y),
+		  FLIP(y) + 1,
 		  x + width + 1,
 		  FLIP(y) - height + 1);
 	SelectObject(DC, Old_Pen); 
@@ -882,6 +882,46 @@ wmesa_renderbuffer_storage(GLcontext *ctx,
     return GL_TRUE;
 }
 
+void wmesa_set_renderbuffer_funcs(struct gl_renderbuffer *rb, int pixelformat,
+                                  int double_buffer)
+{
+    if (double_buffer) {
+	/* Picking the correct span functions is important because
+	 * the DIB was allocated with the indicated depth. */
+	switch(pixelformat) {
+	case PF_5R6G5B:
+	    rb->PutRow = write_rgba_span_16;
+	    rb->PutRowRGB = write_rgb_span_16;
+	    rb->PutMonoRow = write_mono_rgba_span_16;
+	    rb->PutValues = write_rgba_pixels_16;
+	    rb->PutMonoValues = write_mono_rgba_pixels_16;
+	    rb->GetRow = read_rgba_span_16;
+	    rb->GetValues = read_rgba_pixels_16;
+	    break;
+	case PF_8R8G8B:
+	    rb->PutRow = write_rgba_span_32;
+	    rb->PutRowRGB = write_rgb_span_32;
+	    rb->PutMonoRow = write_mono_rgba_span_32;
+	    rb->PutValues = write_rgba_pixels_32;
+	    rb->PutMonoValues = write_mono_rgba_pixels_32;
+	    rb->GetRow = read_rgba_span_32;
+	    rb->GetValues = read_rgba_pixels_32;
+	    break;
+	default:
+	    break;
+	}
+    }
+    else { /* single buffer */
+	rb->PutRow = write_rgba_span_single;
+	rb->PutRowRGB = write_rgb_span_single;
+	rb->PutMonoRow = write_mono_rgba_span_single;
+	rb->PutValues = write_rgba_pixels_single;
+	rb->PutMonoValues = write_mono_rgba_pixels_single;
+	rb->GetRow = read_rgba_span_single;
+	rb->GetValues = read_rgba_pixels_single;
+    }
+}
+
 /**
  * Called by ctx->Driver.ResizeBuffers()
  * Resize the front/back colorbuffers to match the latest window size.
@@ -940,6 +980,21 @@ static void wmesa_update_state(GLcontext *ctx, GLuint new_state)
     /* TODO - need code to update the span functions in case the
      * renderer changes the target buffer (like a DB app writing to
      * the front buffer). */
+
+#if 0
+    {  /* could check _NEW_BUFFERS bit flag here  in new_state */
+	/* In progress - Need to make the wmesa context inherit (by containment)
+	the gl_context, so I can get access to the pixel format */
+	struct gl_renderbuffer *rb;
+	int pixelformat, double_buffer;
+
+	rb = ctx->DrawBuffer->Attachment[BUFFER_BACK_LEFT].Renderbuffer;
+	pixelformat = PF_5R6G5B;  // hard code for now - see note above
+        double_buffer = ctx->DrawBuffer->ColorDrawBuffer[0] == GL_BACK ? 1 : 0;
+	if (rb)
+        wmesa_set_renderbuffer_funcs(rb, pixelformat, double_buffer);
+    }
+#endif
 }
 
 
@@ -958,7 +1013,7 @@ WMesaContext WMesaCreateContext(HDC hDC,
 {
     WMesaContext c;
     struct dd_function_table functions;
-    struct gl_renderbuffer *rb;
+    GLint red_bits, green_bits, blue_bits, alpha_bits;
 
     (void) Pal;
     
@@ -966,43 +1021,61 @@ WMesaContext WMesaCreateContext(HDC hDC,
     if (!rgb_flag)
 	return NULL;
 
+    /* Allocate wmesa context */
     c = CALLOC_STRUCT(wmesa_context);
     if (!c)
 	return NULL;
 
+#if 0
+    /* I do not understand this contributed code */
     /* Support memory and device contexts */
-    if(WindowFromDC(hDC) != NULL)
-    {
-      c->hDC = GetDC(WindowFromDC(hDC));
+    if(WindowFromDC(hDC) != NULL) {
+	c->hDC = GetDC(WindowFromDC(hDC)); // huh ????
     }
-    else
-    {
-      c->hDC = hDC;
+    else {
+	c->hDC = hDC;
     }
-    c->width = GetDeviceCaps(c->hDC, HORZRES);
-    c->height = GetDeviceCaps(c->hDC, VERTRES);
-
-    c->clearPen = CreatePen(PS_SOLID, 1, 0); 
-    c->clearBrush = CreateSolidBrush(0); 
-
-    /* Create back buffer if double buffered */
-    if (db_flag) {
-	c->db_flag = 1; 	
-	wmCreateBackingStore(c, c->width, c->height);
-		
+#else
+    c->hDC = hDC;
+#endif
+
+    /* rememember DC and flag settings */
+    c->rgb_flag = rgb_flag;
+    c->db_flag = db_flag;
+    c->alpha_flag = alpha_flag;
+
+    /* Get data for visual */
+    /* Dealing with this is actually a bit of overkill because Mesa will end
+     * up treating all color component size requests less than 8 by using 
+     * a single byte per channel.  In addition, the interface to the span
+     * routines passes colors as an entire byte per channel anyway, so there
+     * is nothing to be saved by telling the visual to be 16 bits if the device
+     * is 16 bits.  That is, Mesa is going to compute colors down to 8 bits per
+     * channel anyway.
+     * But we go through the motions here anyway.
+     */
+    switch (GetDeviceCaps(c->hDC, BITSPIXEL)) {
+    case 16:
+	red_bits = green_bits = blue_bits = 5;
+	alpha_bits = 0;
+	break;
+    default:
+	red_bits = green_bits = blue_bits = 8;
+	alpha_bits = 8;
+	break;
     }
-    
+    /* Create visual based on flags */
     c->gl_visual = _mesa_create_visual(rgb_flag,
 				       db_flag,    /* db_flag */
 				       GL_FALSE,   /* stereo */
-				       8,8,8,      /* color RGB */
-				       alpha_flag ? 8 : 0, /* color A */
+				       red_bits, green_bits, blue_bits, /* color RGB */
+				       alpha_flag ? alpha_bits : 0, /* color A */
 				       0,          /* index bits */
-				       DEFAULT_SOFTWARE_DEPTH_BITS,         /* depth_bits */
+				       DEFAULT_SOFTWARE_DEPTH_BITS, /* depth_bits */
 				       8,          /* stencil_bits */
 				       16,16,16,   /* accum RGB */
 				       alpha_flag ? 16 : 0, /* accum A */
-				       1);
+				       1);         /* num samples */
     
     if (!c->gl_visual) {
 	_mesa_free(c);
@@ -1011,16 +1084,13 @@ WMesaContext WMesaCreateContext(HDC hDC,
 
     /* Set up driver functions */
     _mesa_init_driver_functions(&functions);
-    /* Fill in required functions */
     functions.GetString = wmesa_get_string;
     functions.UpdateState = wmesa_update_state;
     functions.GetBufferSize = wmesa_get_buffer_size;
     functions.Flush = wmesa_flush;
-
     functions.Clear = clear;
     functions.ClearIndex = clear_index;
     functions.ClearColor = clear_color;
-
     functions.ResizeBuffers = wmesa_resize_buffers;
     functions.Viewport = wmesa_viewport;
 
@@ -1038,77 +1108,7 @@ WMesaContext WMesaCreateContext(HDC hDC,
     _mesa_enable_1_4_extensions(c->gl_ctx);
     _mesa_enable_1_5_extensions(c->gl_ctx);
     _mesa_enable_2_0_extensions(c->gl_ctx);
-    
-    c->gl_buffer = _mesa_create_framebuffer(c->gl_visual);
-    if (!c->gl_buffer) {
-	_mesa_destroy_visual(c->gl_visual);
-	_mesa_free_context_data(c->gl_ctx);
-	_mesa_free(c);
-	return NULL;
-    }
-    
-    rb = CALLOC_STRUCT(gl_renderbuffer);
-
-    if (!rb) {
-	_mesa_destroy_visual(c->gl_visual);
-	_mesa_destroy_framebuffer(c->gl_buffer);
-	_mesa_free_context_data(c->gl_ctx);
-	_mesa_free(c);
-	return NULL;
-    }
-
-    _mesa_init_renderbuffer(rb, (GLuint)0);
-    
-    rb->_BaseFormat = GL_RGBA;
-    rb->InternalFormat = GL_RGBA;
-    rb->DataType = CHAN_TYPE;
-    rb->Delete = wmesa_delete_renderbuffer;
-    rb->AllocStorage = wmesa_renderbuffer_storage;
-
-    if (db_flag) {
-	switch(c->cColorBits) {
-	case 16:
-	    rb->PutRow = write_rgba_span_16;
-	    rb->PutRowRGB = write_rgb_span_16;
-	    rb->PutMonoRow = write_mono_rgba_span_16;
-	    rb->PutValues = write_rgba_pixels_16;
-	    rb->PutMonoValues = write_mono_rgba_pixels_16;
-	    rb->GetRow = read_rgba_span_16;
-	    rb->GetValues = read_rgba_pixels_16;
-	    break;
-	case 32:
-	    rb->PutRow = write_rgba_span_32;
-	    rb->PutRowRGB = write_rgb_span_32;
-	    rb->PutMonoRow = write_mono_rgba_span_32;
-	    rb->PutValues = write_rgba_pixels_32;
-	    rb->PutMonoValues = write_mono_rgba_pixels_32;
-	    rb->GetRow = read_rgba_span_32;
-	    rb->GetValues = read_rgba_pixels_32;
-	    break;
-	default:
-	    break;
-	}
-	_mesa_add_renderbuffer(c->gl_buffer, BUFFER_BACK_LEFT, rb);
-    }
-    else { /* single buffer */
-	rb->PutRow = write_rgba_span_single;
-	rb->PutRowRGB = write_rgb_span_single;
-	rb->PutMonoRow = write_mono_rgba_span_single;
-	rb->PutValues = write_rgba_pixels_single;
-	rb->PutMonoValues = write_mono_rgba_pixels_single;
-	rb->GetRow = read_rgba_span_single;
-	rb->GetValues = read_rgba_pixels_single;
-	_mesa_add_renderbuffer(c->gl_buffer, BUFFER_FRONT_LEFT, rb);
-    }
-
-    _mesa_add_soft_renderbuffers(c->gl_buffer,
-				 GL_FALSE, /* color */
-				 c->gl_visual->depthBits > 0,
-				 c->gl_visual->stencilBits > 0,
-				 c->gl_visual->accumRedBits > 0,
-				 alpha_flag, 
-				 GL_FALSE);
-
+  
     /* Initialize the software rasterizer and helper modules. */
     if (!_swrast_CreateContext(c->gl_ctx) ||
         !_ac_CreateContext(c->gl_ctx) ||
@@ -1120,9 +1120,7 @@ WMesaContext WMesaCreateContext(HDC hDC,
 	_mesa_free(c);
 	return NULL;
     }
-    
     _swsetup_Wakeup(c->gl_ctx);
-    
     TNL_CONTEXT(c->gl_ctx)->Driver.RunPipeline = _tnl_run_pipeline;
 
     return c;
@@ -1161,9 +1159,71 @@ void WMesaDestroyContext( void )
 void WMesaMakeCurrent(WMesaContext c)
 {
     /* return if already current */
-    if (Current == c)
+    if (Current == c || c == NULL)
 	return;
+
+    /* Lazy creation of buffers */
+    if (!c->gl_buffer) {
+        struct gl_renderbuffer *rb;
+        RECT rect;
+	
+	/* Determine window size */
+	if (WindowFromDC(c->hDC)) {
+	    GetClientRect(WindowFromDC(c->hDC), &rect);
+	    c->width = rect.right - rect.left;
+	    c->height = rect.top = rect.bottom;
+	}
+	else { /* Memory context */
+	    /* From contributed code - use the size of the desktop
+	     * for the size of a memory context (?) */
+	    c->width = GetDeviceCaps(c->hDC, HORZRES);
+	    c->height = GetDeviceCaps(c->hDC, VERTRES);
+	}
+	c->clearPen = CreatePen(PS_SOLID, 1, 0); 
+	c->clearBrush = CreateSolidBrush(0); 
+
+	/* Create back buffer if double buffered */
+	if (c->db_flag) {
+	    wmCreateBackingStore(c, c->width, c->height);
+		    
+	}
+	
+	c->gl_buffer = _mesa_create_framebuffer(c->gl_visual);
+	if (!c->gl_buffer)
+	    return;
+    
+	rb = CALLOC_STRUCT(gl_renderbuffer);
+
+	if (!rb)
+	    return;
+
+	_mesa_init_renderbuffer(rb, (GLuint)0);
     
+	rb->_BaseFormat = GL_RGBA;
+	rb->InternalFormat = GL_RGBA;
+	rb->DataType = CHAN_TYPE;
+	rb->Delete = wmesa_delete_renderbuffer;
+	rb->AllocStorage = wmesa_renderbuffer_storage;
+
+	if (c->db_flag)
+	    _mesa_add_renderbuffer(c->gl_buffer, BUFFER_BACK_LEFT, rb);
+	else
+	    _mesa_add_renderbuffer(c->gl_buffer, BUFFER_FRONT_LEFT, rb);
+	wmesa_set_renderbuffer_funcs(rb, c->pixelformat, c->db_flag);
+
+	/* Let Mesa own the Depth, Stencil, and Accum buffers */
+	_mesa_add_soft_renderbuffers(c->gl_buffer,
+				     GL_FALSE, /* color */
+				     c->gl_visual->depthBits > 0,
+				     c->gl_visual->stencilBits > 0,
+				     c->gl_visual->accumRedBits > 0,
+				     c->alpha_flag, 
+				     GL_FALSE);
+    }
+
+
+
+
     if (Current = c)
 	_mesa_make_current(c->gl_ctx, c->gl_buffer, c->gl_buffer);
 }
diff --git a/src/mesa/drivers/windows/gdi/wmesadef.h b/src/mesa/drivers/windows/gdi/wmesadef.h
index a9d0a447de..8b2f4912d6 100644
--- a/src/mesa/drivers/windows/gdi/wmesadef.h
+++ b/src/mesa/drivers/windows/gdi/wmesadef.h
@@ -19,7 +19,9 @@ typedef struct wmesa_context{
     GLuint		width;
     GLuint		height;
     GLuint		ScanWidth;
+    GLboolean		rgb_flag;
     GLboolean		db_flag;
+    GLboolean		alpha_flag;
     WMDIBSECTION	dib;
     BITMAPINFO          bmi;
     HBITMAP             hbmDIB;