1. Texture Not Showing

Hello,

Working on my Raylib wrapper and I cannot get a texture to show.

C code 

typedef struct Texture2D { 
    unsigned int id;        // OpenGL texture id 
    int width;              // Texture base width 
    int height;             // Texture base height 
    int mipmaps;            // Mipmap levels, 1 by default 
    int format;             // Data format (PixelFormat type) 
} Texture2D; 
 
 void DrawTexture(Texture2D texture, int posX, int posY, Color tint)

Eu Wrapper code 

--I have changed the wrapper function to accept the struct as individual variables.  
 
ublic constant xDrawTexture = define_c_proc(ray,"+DrawTexture",{C_UINT,C_INT,C_INT,C_INT,C_INT,C_INT,C_INT,C_UINT}) 
 
public procedure DrawTexture(atom id,atom w,atom h,atom mip,atom mat, atom x,atom y,atom tint) 
 
 c_proc(xDrawTexture,{id,w,h,mip,mat,x,y,tint}) 
	 
end proce

Eu Code (Load Texture Program) 

without warning 
 
include std/machine.e 
include std/convert.e 
include Euraylib.ew 
 
constant width = 800 
constant height = 450 
 
atom black = bytes_to_int({0,0,0,0}) 
atom white = bytes_to_int({255,255,255,255}) 
atom yello = bytes_to_int({255,255,0,255}) 
 
InitWindow(width,height,"Simple Texture") 
 
atom tex = LoadTexture("raylib_logo.png") 
 
while not WindowShouldClose() do 
 
	BeginDrawing() 
 
	ClearBackground(black) 
	 
         --Texture does not show 
	DrawTexture(tex,256,256,1,1,width,height,yello) 
	 
        --Text does show 
	DrawText("This is Texture",1,1,20,yello) 
	 
	EndDrawing() 
	 
end while 
 
UnloadTexture(tex) 
 
CloseWindow()
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2. Re: Texture Not Showing

  • Posted by Maccuq Jul 19, 2019
  • 1500 views

Hi, texture is not showing, because it is not loading. C function 'LoadTexture' is returning struct, not a pointer to a struct.

https://openeuphoria.org/forum/122140.wc#122140

Euraylib.ew 

public constant xLoadImage = define_c_func(ray,"+LoadImage",{C_POINTER},C_POINTER),

Raylib.h 

RLAPI Texture2D LoadTexture(const char *fileName); 
 
RLAPI ModelAnimation *LoadModelAnimations(const char *fileName, int *animsCount);

Euphoria output 

WARNING: [c_proc/c_func] Image fileformat not supported 
WARNING: [c_proc/c_func] Image could not be loaded 
WARNING: Texture could not be created

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3. Re: Texture Not Showing

Maccuq said...

Hi, texture is not showing, because it is not loading. C function 'LoadTexture' is returning struct, not a pointer to a struct.

https://openeuphoria.org/forum/122140.wc#122140

Euraylib.ew 

public constant xLoadImage = define_c_func(ray,"+LoadImage",{C_POINTER},C_POINTER),

Raylib.h 

RLAPI Texture2D LoadTexture(const char *fileName); 
 
RLAPI ModelAnimation *LoadModelAnimations(const char *fileName, int *animsCount);

Euphoria output 

WARNING: [c_proc/c_func] Image fileformat not supported 
WARNING: [c_proc/c_func] Image could not be loaded 
WARNING: Texture could not be created

Thanks that put it in the right direction. I changed it to the C_UINT from a C_POINTER, but still not showing. I also tried LoadImageRaw function and still nothing. Probably going to have to use poke and peek commands I assume in order to get it working.

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4. Re: Texture Not Showing

  • Posted by ghaberek (admin) Jul 19, 2019
  • 1422 views
Icy_Viking said...

Thanks that put it in the right direction. I changed it to the C_UINT from a C_POINTER, but still not showing. I also tried LoadImageRaw function and still nothing. Probably going to have to use poke and peek commands I assume in order to get it working.

The problem is Euphoria doesn't have a concept of returning anything more than a single value from a C function call.

The Texture2D structure is as follows: 

typedef struct Texture2D { 
    unsigned int id; 
    int width; 
    int height; 
    int mipmaps; 
    int format; 
} Texture2D;

In order for Euphoria to support this, you'd have to define the C function as follows: 

constant C_TEXTURE2D = { 
  C_UINT, -- unsigned int id 
  C_INT,  -- int width 
  C_INT,  -- int height 
  C_INT,  -- int mipmaps 
  C_INT   -- int format 
} 
 
constant xLoadTexture = define_c_func( raylib, "+LoadTexture", {C_POINTER}, C_TEXTURE2D ) -- note: C_TEXTURE2D is a sequence!

I'd like to implement this functionality in the future, but for now it simply doesn't exist.

In order to get around this in the past, I've written "shim" libraries in C return the data via a pointer in memory. 

void LoadTextureEx( const char* filename, Texture2D* texture ) 
{ 
    *texture = LoadTexture( filename ); 
} 


constant 
  Texture2D__id      =  0, -- unsigned int 
  Texture2D__width   =  4, -- int 
  Texture2D__height  =  8, -- int 
  Texture2D__mipmaps = 12, -- int 
  Texture2D__format  = 16, -- int 
  SIZEOF_TEXTURE2D   = 20 
 
constant xLoadTextureEx = define_c_proc( shimlib, "+LoadTextureEx", {C_POINTER,C_POINTER} ) 
 
public function LoadTexture( sequence filename ) 
 
    atom texture = allocate_data( SIZEOF_TEXTURE2D ) 
    mem_set( texture, NULL, SIZEOF_TEXTURE2D ) 
 
    c_proc( xLoadTextureEx, {allocate_string(filename),texture} ) 
 
    atom id      = peek4u( texture + Texture2D__id ) 
    atom width   = peek4s( texture + Texture2D__width ) 
    atom height  = peek4s( texture + Texture2D__height ) 
    atom mipmaps = peek4s( texture + Texture2D__mipmaps ) 
    atom format  = peek4s( texture + Texture2D__format ) 
 
    return {id,width,height,mipmaps,format} 
end function

You'd have to do this for every function that returns a structure.

-Greg

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5. Re: Texture Not Showing

ghaberek said...
Icy_Viking said...

Thanks that put it in the right direction. I changed it to the C_UINT from a C_POINTER, but still not showing. I also tried LoadImageRaw function and still nothing. Probably going to have to use poke and peek commands I assume in order to get it working.

The problem is Euphoria doesn't have a concept of returning anything more than a single value from a C function call.

The Texture2D structure is as follows: 

typedef struct Texture2D { 
    unsigned int id; 
    int width; 
    int height; 
    int mipmaps; 
    int format; 
} Texture2D;

In order for Euphoria to support this, you'd have to define the C function as follows: 

constant C_TEXTURE2D = { 
  C_UINT, -- unsigned int id 
  C_INT,  -- int width 
  C_INT,  -- int height 
  C_INT,  -- int mipmaps 
  C_INT   -- int format 
} 
 
constant xLoadTexture = define_c_func( raylib, "+LoadTexture", {C_POINTER}, C_TEXTURE2D ) -- note: C_TEXTURE2D is a sequence!

I'd like to implement this functionality in the future, but for now it simply doesn't exist.

In order to get around this in the past, I've written "shim" libraries in C return the data via a pointer in memory. 

void LoadTextureEx( const char* filename, Texture2D* texture ) 
{ 
    *texture = LoadTexture( filename ); 
} 


constant 
  Texture2D__id      =  0, -- unsigned int 
  Texture2D__width   =  4, -- int 
  Texture2D__height  =  8, -- int 
  Texture2D__mipmaps = 12, -- int 
  Texture2D__format  = 16, -- int 
  SIZEOF_TEXTURE2D   = 20 
 
constant xLoadTextureEx = define_c_proc( shimlib, "+LoadTextureEx", {C_POINTER,C_POINTER} ) 
 
public function LoadTexture( sequence filename ) 
 
    atom texture = allocate_data( SIZEOF_TEXTURE2D ) 
    mem_set( texture, NULL, SIZEOF_TEXTURE2D ) 
 
    c_proc( xLoadTextureEx, {allocate_string(filename),texture} ) 
 
    atom id      = peek4u( texture + Texture2D__id ) 
    atom width   = peek4s( texture + Texture2D__width ) 
    atom height  = peek4s( texture + Texture2D__height ) 
    atom mipmaps = peek4s( texture + Texture2D__mipmaps ) 
    atom format  = peek4s( texture + Texture2D__format ) 
 
    return {id,width,height,mipmaps,format} 
end function

You'd have to do this for every function that returns a structure.

-Greg

I tried the C_TEXTURE2D = {C_UINT,C_INT...} and that didn't work. It came back with an error type_check failure. So I'm assuming the "shim" option is probably the way to go.

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6. Re: Texture Not Showing

  • Posted by ghaberek (admin) Jul 19, 2019
  • 1396 views
Icy_Viking said...

I tried the C_TEXTURE2D = {C_UINT,C_INT...} and that didn't work. It came back with an error type_check failure. So I'm assuming the "shim" option is probably the way to go.

Right, which is why I said:

ghaberek said...

I'd like to implement this functionality in the future, but for now it simply doesn't exist.

If you need some help setting up a shim library, let me know. I'd be happy to help.

-Greg

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7. Re: Texture Not Showing

ghaberek said...
Icy_Viking said...

I tried the C_TEXTURE2D = {C_UINT,C_INT...} and that didn't work. It came back with an error type_check failure. So I'm assuming the "shim" option is probably the way to go.

Right, which is why I said:

ghaberek said...

I'd like to implement this functionality in the future, but for now it simply doesn't exist.

If you need some help setting up a shim library, let me know. I'd be happy to help.

-Greg

Sure I'd like to know how to setup a shim library.


Forked into: raylibshim - A shim library for Euphoria and Raylib

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8. Re: Texture Not Showing

  • Posted by ghaberek (admin) Jul 20, 2019
  • 1377 views
Icy_Viking said...

Sure I'd like to know how to setup a shim library.

If you're not yet comfortable with C programming, I suggest the following documents:

-Greg

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