gl: Remove GLFW and reinstate FreeGLUT.

GLFW doesn't build on Visual Studio 2005 anymore, and I don't have time to keep
up with the changes.

So, we're switching back to FreeGLUT, which is more stable.

I've added the two missing features that made us switch to GLFW in the first
place: input methods and system clipboard support.

If MuPDF is compiled with our version of FreeGLUT, we now use these functions:

	* glutKeyboardExtFunc
	* glutSetClipboard
	* glutGetClipboard

1 files changed, 15 insertions, 15 deletions

diff --git a/platform/gl/gl-input.c b/platform/gl/gl-input.c
index 7ea9bafa..db42cace 100644
--- a/platform/gl/gl-input.c
+++ b/platform/gl/gl-input.c
@@ -112,18 +112,18 @@ static int ui_input_key(struct input *input)
 	switch (ui.key)
 	{
 	case KEY_LEFT:
-		if (ui.mod == GLFW_MOD_CONTROL + GLFW_MOD_SHIFT)
+		if (ui.mod == GLUT_ACTIVE_CTRL + GLUT_ACTIVE_SHIFT)
 		{
 			input->q = prev_word(input->q, input->text);
 		}
-		else if (ui.mod == GLFW_MOD_CONTROL)
+		else if (ui.mod == GLUT_ACTIVE_CTRL)
 		{
 			if (input->p != input->q)
 				input->p = input->q = input->p < input->q ? input->p : input->q;
 			else
 				input->p = input->q = prev_word(input->q, input->text);
 		}
-		else if (ui.mod == GLFW_MOD_SHIFT)
+		else if (ui.mod == GLUT_ACTIVE_SHIFT)
 		{
 			if (input->q > input->text)
 				input->q = prev_char(input->q, input->text);
@@ -137,18 +137,18 @@ static int ui_input_key(struct input *input)
 		}
 		break;
 	case KEY_RIGHT:
-		if (ui.mod == GLFW_MOD_CONTROL + GLFW_MOD_SHIFT)
+		if (ui.mod == GLUT_ACTIVE_CTRL + GLUT_ACTIVE_SHIFT)
 		{
 			input->q = next_word(input->q, input->end);
 		}
-		else if (ui.mod == GLFW_MOD_CONTROL)
+		else if (ui.mod == GLUT_ACTIVE_CTRL)
 		{
 			if (input->p != input->q)
 				input->p = input->q = input->p > input->q ? input->p : input->q;
 			else
 				input->p = input->q = next_word(input->q, input->end);
 		}
-		else if (ui.mod == GLFW_MOD_SHIFT)
+		else if (ui.mod == GLUT_ACTIVE_SHIFT)
 		{
 			if (input->q < input->end)
 				input->q = next_char(input->q);
@@ -163,15 +163,15 @@ static int ui_input_key(struct input *input)
 		break;
 	case KEY_UP:
 	case KEY_HOME:
-		if (ui.mod == GLFW_MOD_CONTROL + GLFW_MOD_SHIFT)
+		if (ui.mod == GLUT_ACTIVE_CTRL + GLUT_ACTIVE_SHIFT)
 		{
 			input->q = input->text;
 		}
-		else if (ui.mod == GLFW_MOD_CONTROL)
+		else if (ui.mod == GLUT_ACTIVE_CTRL)
 		{
 			input->p = input->q = input->text;
 		}
-		else if (ui.mod == GLFW_MOD_SHIFT)
+		else if (ui.mod == GLUT_ACTIVE_SHIFT)
 		{
 			input->q = input->text;
 		}
@@ -182,15 +182,15 @@ static int ui_input_key(struct input *input)
 		break;
 	case KEY_DOWN:
 	case KEY_END:
-		if (ui.mod == GLFW_MOD_CONTROL + GLFW_MOD_SHIFT)
+		if (ui.mod == GLUT_ACTIVE_CTRL + GLUT_ACTIVE_SHIFT)
 		{
 			input->q = input->end;
 		}
-		else if (ui.mod == GLFW_MOD_CONTROL)
+		else if (ui.mod == GLUT_ACTIVE_CTRL)
 		{
 			input->p = input->q = input->end;
 		}
-		else if (ui.mod == GLFW_MOD_SHIFT)
+		else if (ui.mod == GLUT_ACTIVE_SHIFT)
 		{
 			input->q = input->end;
 		}
@@ -254,20 +254,20 @@ static int ui_input_key(struct input *input)
 			char *q = input->p > input->q ? input->p : input->q;
 			memmove(buf, p, q - p);
 			buf[q-p] = 0;
-			glfwSetClipboardString(window, buf);
+			ui_set_clipboard(buf);
 			if (ui.key == KEY_CTL_X)
 				ui_input_delete_selection(input);
 		}
 		break;
 	case KEY_CTL_V:
 		{
-			const char *buf = glfwGetClipboardString(window);
+			const char *buf = ui_get_clipboard();
 			if (buf)
 				ui_input_paste(input, buf, (int)strlen(buf));
 		}
 		break;
 	default:
-		if (ui.key >= 32)
+		if (ui.key >= 32 && ui.plain)
 		{
 			int cat = ucdn_get_general_category(ui.key);
 			if (ui.key == ' ' || (cat >= UCDN_GENERAL_CATEGORY_LL && cat < UCDN_GENERAL_CATEGORY_ZL))