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Mason Wheeler to sdl I updated SDL, and suddenly my SDL frames stopped working. They'd "initialize" full of gibberish, and I couldn't render anything to them. After a bit of digging, I found a problem: the renderer initialization routine in my SDL frame code wasn't getting called anymore. procedure TSdlFrame.Paint; begin if SDL_SelectRenderer(FWindowID) = -1 then CreateRenderer; SDL_RenderPresent; end; function TSdlFrame.CreateRenderer: boolean; const pf: tagPIXELFORMATDESCRIPTOR = (nSize: sizeof(pf); nVersion: 1; dwFlags: PFD_DRAW_TO_WINDOW or PFD_SUPPORT_OPENGL or PFD_DOUBLEBUFFER; iPixelType: PFD_TYPE_RGBA; cColorBits: 24; cAlphaBits: 8; iLayerType: PFD_MAIN_PLANE); RENDERERS: array[TRendererType] of AnsiString = ('software', 'gdi', 'opengl', 'd3d'); var pFormat: integer; begin if (SDL_SelectRenderer(FWindowID) = 0) then begin result := true; Exit; end; if FRendererType = rtOpenGL then begin pFormat := ChoosePixelFormat(canvas.Handle, @pf); if not SetPixelFormat(canvas.Handle, pFormat, @pf) then outputDebugString(PChar(SysErrorMessage(GetLastError))); if wglCreateContext(canvas.Handle) = 0 then outputDebugString(PChar(SysErrorMessage(GetLastError))); end; if (SDL_CreateRenderer(FWindowID, SDL_RendererIndex(RENDERERS[FRendererType]), [sdlrPresentFlip3, sdlrAccelerated]) = 0) then begin SDL_ShowWindow(FWindowID); assert(SDL_SetRenderDrawColor(0, 0, 0, 255) = 0); FFlags := SDL_GetWindowFlags(FWindowID); if assigned(FOnAvailable) then FOnAvailable(self); end else outputDebugString(pChar(format('SDL_CreateRenderer failed: %s', [sdl_GetError]))); result := SDL_SelectRenderer(FWindowID) = 0; end; This is a critical issue. The Paint method gets called when the control receives a WM_PAINT message from Windows. I can't create the renderer before then, or it will fail and cause trouble. And when I do create it, it needs to be created with certain parameters. So imagine my surprise when I started debugging into the DLL and found that SDL_SelectRenderer was trying to be "helpful" by creating the renderer for me if it didn't already exist! Now not only does my initialization code not get called, I end up with the wrong renderer and so things don't render as expected when I try to use the window.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 24 Nov 2009 04:48:12 +0000
parents d6b79fc83362
children f7b03b6838cb
line wrap: on
line source

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2009 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org

    QNX Photon GUI SDL driver
    Copyright (C) 2009 Mike Gorchak
    (mike@malva.ua, lestat@i.com.ua)
*/

#ifndef __SDL_PHOTON_RENDER_H__
#define __SDL_PHOTON_RENDER_H__

#include "../SDL_sysvideo.h"

#include <Ph.h>
#include <photon/PhRender.h>

#define SDL_PHOTON_MAX_SURFACES 3

#define SDL_PHOTON_SURFTYPE_UNKNOWN    0x00000000
#define SDL_PHOTON_SURFTYPE_OFFSCREEN  0x00000001
#define SDL_PHOTON_SURFTYPE_PHIMAGE    0x00000002

#define SDL_PHOTON_UNKNOWN_BLEND       0x00000000
#define SDL_PHOTON_DRAW_BLEND          0x00000001
#define SDL_PHOTON_TEXTURE_BLEND       0x00000002

typedef struct SDL_RenderData
{
    SDL_bool enable_vsync;              /* VSYNC flip synchronization enable  */
    uint32_t surface_visible_idx;       /* Index of visible surface           */
    uint32_t surface_render_idx;        /* Index of render surface            */
    uint32_t surfaces_count;            /* Amount of allocated surfaces       */
    uint32_t surfaces_type;             /* Type of allocated surfaces         */
    uint32_t window_width;              /* Last active window width           */
    uint32_t window_height;             /* Last active window height          */
    PhGC_t* gc;                         /* Graphics context                   */
    SDL_bool direct_mode;               /* Direct Mode state                  */
    PdOffscreenContext_t* osurfaces[SDL_PHOTON_MAX_SURFACES];
    PhImage_t* psurfaces[SDL_PHOTON_MAX_SURFACES];
    PmMemoryContext_t* pcontexts[SDL_PHOTON_MAX_SURFACES];
} SDL_RenderData;

typedef struct SDL_TextureData
{
   uint32_t surface_type;
   PdOffscreenContext_t* osurface;
   PhImage_t* psurface;
   PmMemoryContext_t* pcontext;
} SDL_TextureData;

extern void photon_addrenderdriver(_THIS);

/* Helper function, which redraws the backbuffer */
int _photon_update_rectangles(SDL_Renderer* renderer, PhRect_t* rect);

#endif /* __SDL_PHOTON_RENDER_H__ */

/* vi: set ts=4 sw=4 expandtab: */