SDL_CreateTexture failing

Mason_Wheeler · March 24, 2009, 11:01pm

I’m trying to call SDL_CreateTexture(0, 1 (streaming), 96, 96), but it fails inside GDI_CreateTexture at this call:
} else {
data->hbm =
CreateCompatibleBitmap(renderdata->window_hdc, texture->w,
texture->h);

CreateCompatibleBitmap returns NULL.

I’ve got a valid window and a valid renderer, but the first time I try to create a texture, it doesn’t create. The renderer was created with the following Delphi call:

SDL_CreateRenderer(FWindowID, 1, [sdlrPresentCopy]);

where FWindowID is a valid SDL window. Anyone have any idea waht’s going on?

In case it helps, here’s a dump of the Renderer and Texture state data from the debugger, right before the call:

   renderer    0x00230558 {ActivateRenderer=0x00000000 DisplayModeChanged=0x100a1420 CreateTexture=0x100a1560 ...}    SDL_Renderer *
  ActivateRenderer    0x00000000    int (SDL_Renderer *)*
  DisplayModeChanged    0x100a1420 GDI_DisplayModeChanged(SDL_Renderer *)    int (SDL_Renderer *)*
  CreateTexture    0x100a1560 GDI_CreateTexture(SDL_Renderer *, SDL_Texture *)    int (SDL_Renderer *, SDL_Texture *)*
  QueryTexturePixels    0x100a18f0 GDI_QueryTexturePixels(SDL_Renderer *, SDL_Texture *, void * *, int *)    int (SDL_Renderer *, SDL_Texture *, void * *, int *)*
  SetTexturePalette    0x100a1940 GDI_SetTexturePalette(SDL_Renderer *, SDL_Texture *, const SDL_Color *, int, int)    int (SDL_Renderer *, SDL_Texture *, const SDL_Color *, int, int)*
  GetTexturePalette    0x100a1a20 GDI_GetTexturePalette(SDL_Renderer *, SDL_Texture *, SDL_Color *, int, int)    int (SDL_Renderer *, SDL_Texture *, SDL_Color *, int, int)*
  SetTextureColorMod    0x00000000    int (SDL_Renderer *, SDL_Texture *)*
  SetTextureAlphaMod    0x100a1af0 GDI_SetTextureAlphaMod(SDL_Renderer *, SDL_Texture *)    int (SDL_Renderer *, SDL_Texture *)*
  SetTextureBlendMode    0x100a1b00 GDI_SetTextureBlendMode(SDL_Renderer *, SDL_Texture *)    int (SDL_Renderer *, SDL_Texture *)*
  SetTextureScaleMode    0x100a1c80 GDI_SetTextureScaleMode(SDL_Renderer *, SDL_Texture *)    int (SDL_Renderer *, SDL_Texture *)*
  UpdateTexture    0x100a1cf0 GDI_UpdateTexture(SDL_Renderer *, SDL_Texture *, const SDL_Rect *, const void *, int)    int (SDL_Renderer *, SDL_Texture *, const SDL_Rect *, const void *, int)*
  LockTexture    0x100a1fe0 GDI_LockTexture(SDL_Renderer *, SDL_Texture *, const SDL_Rect *, int, void * *, int *)    int (SDL_Renderer *, SDL_Texture *, const SDL_Rect *, int, void * *, int *)*
  UnlockTexture    0x100a2080 GDI_UnlockTexture(SDL_Renderer *, SDL_Texture *)    void (SDL_Renderer *, SDL_Texture *)*
  DirtyTexture    0x00000000    void (SDL_Renderer *, SDL_Texture *, int, const SDL_Rect *)*
  SetDrawColor    0x00000000    int (SDL_Renderer *)*
  SetDrawBlendMode    0x100a20c0 GDI_SetDrawBlendMode(SDL_Renderer *)    int (SDL_Renderer *)*
  RenderPoint    0x100a2100 GDI_RenderPoint(SDL_Renderer *, int, int)    int (SDL_Renderer *, int, int)*
  RenderLine    0x100a2190 GDI_RenderLine(SDL_Renderer *, int, int, int, int)    int (SDL_Renderer *, int, int, int, int)*
  RenderFill    0x100a22c0 GDI_RenderFill(SDL_Renderer *, const SDL_Rect *)    int (SDL_Renderer *, const SDL_Rect *)*
  RenderCopy    0x100a23b0 GDI_RenderCopy(SDL_Renderer *, SDL_Texture *, const SDL_Rect *, const SDL_Rect *)    int (SDL_Renderer *, SDL_Texture *, const SDL_Rect *, const SDL_Rect *)*
  RenderPresent    0x100a25a0 GDI_RenderPresent(SDL_Renderer *)    void (SDL_Renderer *)*
  DestroyTexture    0x100a26c0 GDI_DestroyTexture(SDL_Renderer *, SDL_Texture *)    void (SDL_Renderer *, SDL_Texture *)*
  DestroyRenderer    0x100a2740 GDI_DestroyRenderer(SDL_Renderer *)    void (SDL_Renderer *)*

   info    {name=0x100ec550 "gdi" flags=66 mod_modes=2 ...}    SDL_RendererInfo

   name    0x100ec550 "gdi"    const char *
  flags    66    unsigned int
  mod_modes    2    unsigned int
  blend_modes    1    unsigned int
  scale_modes    1    unsigned int
  num_texture_formats    14    unsigned int

   texture_formats    0x002305cc    unsigned int [20]
  [0]    2197817345    unsigned int
  [1]    2232618754    unsigned int
  [2]    2232750082    unsigned int
  [3]    2249594884    unsigned int
  [4]    2253789188    unsigned int
  [5]    2251694084    unsigned int
  [6]    2252742660    unsigned int
  [7]    2255888388    unsigned int
  [8]    2256936964    unsigned int
  [9]    842094169    unsigned int
  [10]    1448433993    unsigned int
  [11]    844715353    unsigned int
  [12]    1498831189    unsigned int
  [13]    1431918169    unsigned int
  [14]    0    unsigned int
  [15]    0    unsigned int
  [16]    0    unsigned int
  [17]    0    unsigned int
  [18]    0    unsigned int
  [19]    0    unsigned int
  max_texture_width    0    int
  max_texture_height    0    int
  window    1    unsigned int
  r    0    unsigned char
  g    0    unsigned char
  b    0    unsigned char
  a    0    unsigned char
  blendMode    0    int
  driverdata    0x002310a0    void *

   texture    0x00231db8 {id=2 format=0 access=1 ...}    SDL_Texture *
  id    2    unsigned int
  format    0    unsigned int
  access    1    int
  w    96    int
  h    96    int
  modMode    0    int
  blendMode    0    int
  scaleMode    0    int
  r    255 '?'    unsigned char
  g    255 '?'    unsigned char
  b    255 '?'    unsigned char
  a    255 '?'    unsigned char

   renderer    0x00230558 {ActivateRenderer=0x00000000 DisplayModeChanged=0x100a1420 CreateTexture=0x100a1560 ...}    SDL_Renderer *
  driverdata    0x00231df0    void *

   next    0x00000000 {id=??? format=??? access=??? ...}    SDL_Texture *

Donny_Viszneki · March 25, 2009, 12:05am

Well, one interesting thing to note is that this code path is only
supposed to be active when not requesting streaming access:

if (data->yuv || texture->access == SDL_TEXTUREACCESS_STREAMING
    || texture->format != display->current_mode.format) {
....
} else {
    data->hbm =
        CreateCompatibleBitmap(renderdata->window_hdc, texture->w,

Are you doing anything interesting like using a foreign window? Can
you create a small example case?

I didn’t even know “streaming access” was relevant to GDI :OOn Tue, Mar 24, 2009 at 7:01 PM, Mason Wheeler wrote:

I’m trying to call SDL_CreateTexture(0, 1 (streaming), 96, 96), but it fails inside GDI_CreateTexture at this call:
? ?} else {
? ? ? ?data->hbm =
? ? ? ? ? ?CreateCompatibleBitmap(renderdata->window_hdc, texture->w,
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? texture->h);

CreateCompatibleBitmap returns NULL.

–
http://codebad.com/

Mason_Wheeler · March 25, 2009, 12:16am

Oops! Wrong call! Sorry, it’s

    data->hbm =
        CreateDIBSection(renderdata->memory_hdc, bmi, DIB_RGB_COLORS,
                         &data->pixels, NULL, 0);

Good catch!

And yes, I have a small, simple test case. If you have a copy of Delphi, you can even test it out for yourself. (Unfortunately, it involves a custom component, which won’t work with the free Turbo Delphi version.)

And it is using a foreign window, but the window and renderer have both been created correctly and it’s possible to draw to the window with SDL_RenderFill, so I doubt that’s the problem.>----- Original Message ----

From: Donny Viszneki <donny.viszneki at gmail.com>
Subject: Re: [SDL] SDL_CreateTexture failing

On Tue, Mar 24, 2009 at 7:01 PM, Mason Wheeler <@Mason_Wheeler> wrote:

I’m trying to call SDL_CreateTexture(0, 1 (streaming), 96, 96), but it fails inside GDI_CreateTexture at this call:
} else {
data->hbm =
CreateCompatibleBitmap(renderdata->window_hdc, texture->w,
texture->h);

CreateCompatibleBitmap returns NULL.

Well, one interesting thing to note is that this code path is only
supposed to be active when not requesting streaming access:

Are you doing anything interesting like using a foreign window? Can
you create a small example case?

I didn’t even know “streaming access” was relevant to GDI

Donny_Viszneki · March 25, 2009, 12:48am

Out of curiosity, what is your SDL display mode?–
http://codebad.com/

Mason_Wheeler · March 25, 2009, 1:23am

SDL_GetCurrentDisplayMode returns:
format: 2249594884
w: 1920
h: 1080
refresh_rate: 60
driverdata: $290268

Which is basically just my screen resolution, unless that Format number means anything special. Is that what you’re looking for?>----- Original Message ----

From: Donny Viszneki <donny.viszneki at gmail.com>
Subject: Re: [SDL] SDL_CreateTexture failing

Out of curiosity, what is your SDL display mode?

Donny_Viszneki · March 25, 2009, 2:39am

This appears to mean this:

SDL_PIXELTYPE_PACKED32
SDL_BITMAPORDER_4321
SDL_PACKEDLAYOUT_8888
24 bits per pixel
4 bytes per pixel

Odd that 24 bits != 4 bytes

SDL_pixel.h is rather obtuse code. I don’t know why Sam didn’t use a
struct for this stuff! (Perhaps bitfields aren’t as portable as I’d
thought?)On Tue, Mar 24, 2009 at 9:23 PM, Mason Wheeler wrote:

format: 2249594884

–
http://codebad.com/

Donny_Viszneki · March 25, 2009, 2:42am

SDL_BITMAPORDER_4321 might also be SDL_PACKEDORDER_XRGB. Actually this
looks more reasonable. Thus the value SDL_PIXELFORMAT_RGB888 is what
we have. And now I understand why Sam didn’t use a struct – he wanted
to define all these enums, and I guess there’s no portable inline
struct value syntax?On Tue, Mar 24, 2009 at 10:39 PM, Donny Viszneki <@Donny_Viszneki> wrote:

SDL_PIXELTYPE_PACKED32
SDL_BITMAPORDER_4321
SDL_PACKEDLAYOUT_8888
24 bits per pixel
4 bytes per pixel

Odd that 24 bits != 4 bytes

–
http://codebad.com/