Allow MessageBox to work without window

src/render/psp/SDL_render_psp.c

@@ -39,13 +39,6 @@
 #include "SDL_render_psp.h"
 
 /* PSP renderer implementation, based on the PGE  */
-
-#define PSP_SCREEN_WIDTH  480
-#define PSP_SCREEN_HEIGHT 272
-
-#define PSP_FRAME_BUFFER_WIDTH 512
-#define PSP_FRAME_BUFFER_SIZE  (PSP_FRAME_BUFFER_WIDTH * PSP_SCREEN_HEIGHT)
-
 static unsigned int __attribute__((aligned(16))) DisplayList[262144];
 
 #define COL5650(r, g, b, a) ((r >> 3) | ((g >> 2) << 5) | ((b >> 3) << 11))

src/render/psp/SDL_render_psp.h

@@ -22,6 +22,12 @@
 /* this header is meant to be included after the other related internal SDL
    headers. it's the interface between psp renderer and video driver code. */
 
+#define PSP_SCREEN_WIDTH  480
+#define PSP_SCREEN_HEIGHT 272
+
+#define PSP_FRAME_BUFFER_WIDTH 512
+#define PSP_FRAME_BUFFER_SIZE  (PSP_FRAME_BUFFER_WIDTH * PSP_SCREEN_HEIGHT)
+
 enum SDL_PSP_RenderProps
 {
     SDL_PSP_RENDERPROPS_FRONTBUFFER,

src/video/psp/SDL_pspvideo.c

@@ -39,11 +39,11 @@
 #include "SDL_pspvideo.h"
 #include "SDL_pspevents_c.h"
 #include "SDL_pspgl_c.h"
-#include "SDL_pspmessagebox.h"
 
 #include <psputility.h>
 #include <pspgu.h>
 #include <pspdisplay.h>
+#include <vram.h>
 #include "../../render/psp/SDL_render_psp.h"
 
 #define SDL_WINDOWTEXTUREDATA "_SDL_WindowTextureData"
@@ -65,7 +65,7 @@ int PSP_CreateWindowFramebuffer(SDL_VideoDevice *_this, SDL_Window *window, Uint
 
     SDL_GetWindowSizeInPixels(window, &w, &h);
 
-    if (w != 480) {
+    if (w != PSP_SCREEN_WIDTH) {
         return SDL_SetError("Unexpected window size");
     }
 
@@ -257,6 +257,146 @@ static SDL_VideoDevice *PSP_Create()
     return device;
 }
 
+static void configure_dialog(pspUtilityMsgDialogParams *dialog, size_t dialog_size)
+{
+	/* clear structure and setup size */
+	SDL_memset(dialog, 0, dialog_size);
+	dialog->base.size = dialog_size;
+
+	/* set language */
+	sceUtilityGetSystemParamInt(PSP_SYSTEMPARAM_ID_INT_LANGUAGE, &dialog->base.language);
+
+	/* set X/O swap */
+	sceUtilityGetSystemParamInt(PSP_SYSTEMPARAM_ID_INT_UNKNOWN, &dialog->base.buttonSwap);
+
+	/* set thread priorities */
+	/* TODO: understand how these work */
+	dialog->base.soundThread = 0x10;
+	dialog->base.graphicsThread = 0x11;
+	dialog->base.fontThread = 0x12;
+	dialog->base.accessThread = 0x13;
+}
+
+static void *setup_temporal_gu(void *list)
+{
+    // Using GU_PSM_8888 for the framebuffer
+	int bpp = 4;
+
+	void *doublebuffer = vramalloc(PSP_FRAME_BUFFER_SIZE * bpp * 2);
+    void *backbuffer = doublebuffer;
+    void *frontbuffer = ((uint8_t *)doublebuffer) + PSP_FRAME_BUFFER_SIZE * bpp;
+
+    sceGuInit();
+
+    sceGuStart(GU_DIRECT,list);
+	sceGuDrawBuffer(GU_PSM_8888, vrelptr(frontbuffer), PSP_FRAME_BUFFER_WIDTH);
+    sceGuDispBuffer(PSP_SCREEN_WIDTH, PSP_SCREEN_HEIGHT, vrelptr(backbuffer), PSP_FRAME_BUFFER_WIDTH);
+
+    sceGuOffset(2048 - (PSP_SCREEN_WIDTH >> 1), 2048 - (PSP_SCREEN_HEIGHT >> 1));
+    sceGuViewport(2048, 2048, PSP_SCREEN_WIDTH, PSP_SCREEN_HEIGHT);
+
+    sceGuDisable(GU_DEPTH_TEST);
+
+    /* Scissoring */
+    sceGuScissor(0, 0, PSP_SCREEN_WIDTH, PSP_SCREEN_HEIGHT);
+    sceGuEnable(GU_SCISSOR_TEST);
+
+    sceGuFinish();
+    sceGuSync(0,0);
+
+    sceDisplayWaitVblankStart();
+    sceGuDisplay(GU_TRUE);
+
+	return doublebuffer;
+}
+
+static void term_temporal_gu(void *guBuffer)
+{
+	sceGuTerm();
+	vfree(guBuffer);
+	sceDisplayWaitVblankStart();
+}
+
+int PSP_ShowMessageBox(const SDL_MessageBoxData *messageboxdata, int *buttonid)
+{
+	unsigned char list[64] __attribute__((aligned(64)));
+	pspUtilityMsgDialogParams dialog;
+	int status;
+	void *guBuffer = NULL;
+
+	/* check if it's possible to use existing video context */
+	if (SDL_GetFocusWindow() == NULL) {
+		guBuffer = setup_temporal_gu(list);
+	}
+
+	/* configure dialog */
+	configure_dialog(&dialog, sizeof(dialog));
+
+	/* setup dialog options for text */
+	dialog.mode = PSP_UTILITY_MSGDIALOG_MODE_TEXT;
+	dialog.options = PSP_UTILITY_MSGDIALOG_OPTION_TEXT;
+
+	/* copy the message in, 512 bytes max */
+	SDL_snprintf(dialog.message, sizeof(dialog.message), "%s\r\n\r\n%s", messageboxdata->title, messageboxdata->message);
+
+	/* too many buttons */
+	if (messageboxdata->numbuttons > 2)
+		return SDL_SetError("messageboxdata->numbuttons valid values are 0, 1, 2");
+
+	/* we only have two options, "yes/no" or "ok" */
+	if (messageboxdata->numbuttons == 2)
+		dialog.options |= PSP_UTILITY_MSGDIALOG_OPTION_YESNO_BUTTONS | PSP_UTILITY_MSGDIALOG_OPTION_DEFAULT_NO;
+
+	/* start dialog */
+	if (sceUtilityMsgDialogInitStart(&dialog) != 0)
+		return SDL_SetError("sceUtilityMsgDialogInitStart() failed for some reason");
+
+	/* loop while the dialog is active */
+	status = PSP_UTILITY_DIALOG_NONE;
+	do
+	{
+		sceGuStart(GU_DIRECT, list);
+		sceGuClearColor(0);
+		sceGuClearDepth(0);
+		sceGuClear(GU_COLOR_BUFFER_BIT|GU_DEPTH_BUFFER_BIT);
+		sceGuFinish();
+		sceGuSync(0,0);
+
+		status = sceUtilityMsgDialogGetStatus();
+
+		switch (status)
+		{
+			case PSP_UTILITY_DIALOG_VISIBLE:
+				sceUtilityMsgDialogUpdate(1);
+				break;
+
+			case PSP_UTILITY_DIALOG_QUIT:
+				sceUtilityMsgDialogShutdownStart();
+				break;
+		}
+
+		sceDisplayWaitVblankStart();
+		sceGuSwapBuffers();
+
+	} while (status != PSP_UTILITY_DIALOG_NONE);
+
+	/* cleanup */
+	if (guBuffer)
+	{
+		term_temporal_gu(guBuffer);
+	}
+
+	/* success */
+	if (dialog.buttonPressed == PSP_UTILITY_MSGDIALOG_RESULT_YES)
+		*buttonid = messageboxdata->buttons[0].buttonid;
+	else if (dialog.buttonPressed == PSP_UTILITY_MSGDIALOG_RESULT_NO)
+		*buttonid = messageboxdata->buttons[1].buttonid;
+	else
+		*buttonid = messageboxdata->buttons[0].buttonid;
+
+	return 0;
+}
+
 VideoBootStrap PSP_bootstrap = {
     "PSP",
     "PSP Video Driver",
@@ -278,8 +418,8 @@ int PSP_VideoInit(_THIS)
 
     SDL_zero(current_mode);
 
-    current_mode.w = 480;
-    current_mode.h = 272;
+    current_mode.w = PSP_SCREEN_WIDTH;
+    current_mode.h = PSP_SCREEN_HEIGHT;
 
     current_mode.refresh_rate = 60;
     /* 32 bpp for default */