Linux problems

SDL Development
1

I’m having some odd problems with SDL2.0.2 on Ubuntu Linux - Line drawing works okay, but drawing a rectangle doesn’t - nothing is display no matter what colour is used.

In addition, SDL_ttf isn’t working properly either - a surface is being created but again, nothing is being displayed.

My rectangle routine is thus :

Code:

SDL_Rect rect;

rect.x=sx;

rect.y=sy;

rect.w=ex;

rect.h=ey;

// SDL_SetRenderDrawBlendMode(m_mainRenderer,blendModes[DRAW-TEXTURE].mode);

//SDL_SetRenderDrawColor(m_mainRenderer,RGBR(col),RGBG(col),RGBB(col),SDL_ALPHA_OPAQUE);

if (SDL_RenderFillRect(m_mainRenderer,(SDL_Rect *) &rect)!=0)
{
    DEBUG("Error!");

}

No error is being reported with RenderFillRect and the main renderer has been set up.

It all works fine in Windows!

2

Can you post your complete test code that reproduces the issue?On Fri, Aug 15, 2014 at 5:37 PM, MrTAToad wrote:

I’m having some odd problems with SDL2.0.2 on Ubuntu Linux - Line
drawing works okay, but drawing a rectangle doesn’t - nothing is display no
matter what colour is used.

In addition, SDL_ttf isn’t working properly either - a surface is being
created but again, nothing is being displayed.

My rectangle routine is thus :

Code:

SDL_Rect rect;

rect.x=sx;

rect.y=sy;

rect.w=ex;

rect.h=ey;

//
SDL_SetRenderDrawBlendMode(m_mainRenderer,blendModes[DRAW-TEXTURE].mode);

//SDL_SetRenderDrawColor(m_mainRenderer,RGBR(col),RGBG(col),RGBB(col),SDL_ALPHA_OPAQUE);

if (SDL_RenderFillRect(m_mainRenderer,(SDL_Rect *) &rect)!=0)
{
    DEBUG("Error!");

}

No error is being reported with RenderFillRect and the main renderer has
been set up.

It all works fine in Windows!

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3

My test code is :

Code:
#include <Triority.h>

int main(int argc,char *argv[])
{
if (__GLB_Defaults(argc,argv,“linux”,“test”)==false)
{
END();
return false;
}

//SETSCREEN(640,480,false);
//SETFONT(0);
FONTCOLOUR(0);
CLEARSCREEN(0);
while (true)
{
    //ALPHAMODE(-1.0);
    DRAWRECT(0,0,100,100,GLRGB(255,0,0));
    DRAWLINE(0,0,300,300,GLRGB(0,0,255));

    ALPHAMODE(0);
    if (PRINT("Test",100,100)==false)
    {
        DEBUG("Error : "+GETLASTERROR_Str()+"\n");
    }

    SHOWSCREEN();

}
return true;

}

4

For the sake of sanity, you’ll also have to include definitions for
DRAWRECT, DRAWLINE, ALPHAMODE, and SHOWSCREEN, as well as your SDL init
code (I presume that’s inside __GLB_defaults() ?), since it would be most
helpful for debugging the code that’s directly using SDL.On Fri, Aug 15, 2014 at 6:52 PM, MrTAToad wrote:

My test code is :

Code:

#include

int main(int argc,char *argv[])
{
if (__GLB_Defaults(argc,argv,“linux”,“test”)==false)
{
END();
return false;
}

//SETSCREEN(640,480,false);
//SETFONT(0);
FONTCOLOUR(0);
CLEARSCREEN(0);
while (true)
{
    //ALPHAMODE(-1.0);
    DRAWRECT(0,0,100,100,GLRGB(255,0,0));
    DRAWLINE(0,0,300,300,GLRGB(0,0,255));

    ALPHAMODE(0);
    if (PRINT("Test",100,100)==false)
    {
        DEBUG("Error : "+GETLASTERROR_Str()+"\n");
    }

    SHOWSCREEN();

}
return true;

}

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5

My Triority system can be downloaded from : https://onedrive.live.com/redir?resid=C74F6DC48C7A65C9!1049

6

__glb_init :

Code:
DGNat __GLB_Defaults(int argc, char * argv[],const char *organisation,const char *programName)
{
int imgFlags = IMG_INIT_JPG | IMG_INIT_PNG | IMG_INIT_TIF;
DGStr progName;

SDL_ClearError();

try
{
    if (m_window==NULL)
    {
		DGNat defaultFontIndex = 0;

		if (SDL_Init(SDL_INIT_EVERYTHING)!=0)               throw(CMP_SDL_ERROR);
        if ((IMG_Init(imgFlags) & imgFlags)!=imgFlags)      throw(CMP_SDL_IMG_ERROR);
        if (TTF_Init()!=0)                                  throw(CMP_SDL_TTF_ERROR);
        if (SDLNet_Init()!=0)                               throw(CMP_SDL_NET_ERROR);
        if (Mix_OpenAudio(22050,AUDIO_S16SYS,2,4096)!=0)    throw(CMP_SDL_MIXER_ERROR);

		DEBUG("Credits : \n");
		DEBUG("Default font created by Paul D. Hunt\n");
		DEBUG("Converted to C array by Nicholas Kingslery using GLBasic\n");
		DEBUG("Sprite collision detection based on Separating Axis Theorem - original code at http://ragestorm.net/samples/CDRR.C\n");

		SDL_zero(viewportRect);

        blendModes=new (std::nothrow) struct __blend[MAX_BLEND];
        proFontSprites=new (std::nothrow) DGNat[MAX_PROSPRITES];
        borderColour=new (std::nothrow) DGNat[MAX_BORDERCOLOURS];
        if (blendModes==NULL || proFontSprites==NULL || borderColour==NULL) throw(CMP_OUT_OF_MEMORY);

        m_background=new (std::nothrow) struct __sprite;
        if (m_background==NULL)                                             throw(CMP_OUT_OF_MEMORY);
        m_background->texture=NULL;

        setlocale(LC_ALL, "");
        isMinimised=false; // Needs to be current window setting
		inKeyChar = "";
		editChar = "";

        DIM(sprites,0);
        DIM(fonts,0);
        DIM(screens,0);
        DIM(files,0);
        DIM(sounds,0);
        DIM(ini,0);
        DIM(modules,0);
        DIM(proFonts,0);
        DIM(particles,0);
        DIM(freeParticles,600);
        DIM(liveParticles,0);

        // Clear the pro font sprite list
		for (int loop = 0; loop<MAX_PROSPRITES; loop++)   proFontSprites[loop] = INVALID_HANDLE;

        ALLOWESCAPE(ALLOW_ESCAPE | ALLOW_CLOSE | ALLOW_ALTRETURN);

        SETTITLE(progName.c_str());

        SETSCREEN(640,480,false);
        SETBORDERCOLOUR(0,GLRGB(255,255,255));
        SETBORDERSIZE(0);
        SETBORDERTYPE(SINGLE);
        LIMITFPS(75.0,false);
        SEEDRND((DGNat) GETTIMERALL());

		BLENDMODE(SDL_BLENDMODE_BLEND);
		ALPHALEVEL(255);
		COLOURLEVEL(GLRGB(255, 255, 255));

		SETTRANSPARENCY(0);
        CLEARSCREEN(GLRGB(0,0,0));
        AUTOPAUSE(true);

		FONTCOLOUR(GLRGB(255, 255, 255));
        SPRITEHANDLE(TOPLEFT,TOPLEFT);

        //LOADBMP(DGStr(""));
		if (LOADFONT(defaultFont, defaultFont_FILESIZE, defaultFontIndex, 16) == false)
		{
			DEBUG("* Warning!  Unable to create font from default data.  No text will currently be displayed.\n");
		}

		SETFONT(defaultFontIndex);

        SETPROFONT(0);
        SETPROFONTCHARSPACING(0);
        SETPROFONTLINESPACING(0);

        //glEnable( GL_TEXTURE_2D ); // Need this to display a texture

        numberOfDesktops=SDL_GetNumVideoDisplays();
        __numJoysticks=SDL_NumJoysticks();

        DIM(joysticks,__numJoysticks);
        for (int loop=0; loop<__numJoysticks; loop++)
        {
            joysticks(loop)=SDL_JoystickOpen(loop);
        }

        progName=(programName==NULL ? "Test" : programName);
        basePath=SDL_GetBasePath();
        prefPath=SDL_GetPrefPath((organisation==NULL ? "GLBasic" : organisation),
                                 progName.c_str());

        if (prefPath)
        {
            CREATEDIR(prefPath);
        }


        // Process the command line arguments
        commandLine="";
        for (int loop=0; loop<argc; loop++)
        {
            if (loop==0)
            {
                commandLine+=DGStr("\"")+argv[loop]+DGStr("\"");
            }
            else
            {
                commandLine+=argv[loop];
            }

            if (loop<argc-1) commandLine+=" ";
        }

        // Setup frame time
        lastTicks=0;
        frameTime=0;
    }

    return true;
}
catch (const DGNat& error)
{
	if (blendModes)
	{
		delete[] blendModes;
		blendModes = NULL;
	}

	if (proFontSprites)
	{
		delete[] proFontSprites;
		proFontSprites = NULL;
	}

	if (borderColour)
	{
		delete[] borderColour;
		borderColour = NULL;
	}

	if (m_background)
	{
		delete m_background;
		m_background = NULL;
	}

    __Error(error);
    return false;
}

}

Drawline :

Code:
void GLBASIC::DRAWLINE(DGNat sx, DGNat sy, DGNat ex, DGNat ey, DGNat col)
{
SDL_SetRenderDrawBlendMode(m_mainRenderer,blendModes[DRAW-TEXTURE].mode);
SDL_SetRenderDrawColor(m_mainRenderer,RGBR(col),RGBG(col),RGBB(col),SDL_ALPHA_OPAQUE);
SDL_RenderDrawLine(m_mainRenderer,sx,sy,ex,ey);
}

Showscreen :

Code:
void GLBASIC::SHOWSCREEN()
{
SDL_RenderPresent(m_mainRenderer);
X_MAKE2D();

ALPHAMODE(0); // Change later!
VIEWPORT(0, 0, -1, -1);

ProcessEvents(false);

}

Alphamode :

Code:
void GLBASIC::ALPHAMODE(DGInt amount)
{
amount=CONSTRAIN(amount,-1.0,3.0);
if (amount<0.0)
{
BLENDMODE(SDL_BLENDMODE_BLEND); ALPHALEVEL((DGNat) ABS(amount*255.0));
}
else if (amount > 0.0)
{
if (amount >= 2.0)
{
BLENDMODE(SDL_BLENDMODE_MOD); ALPHALEVEL((DGNat)ABS((amount - 2.0)255.0));
}
else
{
BLENDMODE(SDL_BLENDMODE_ADD); ALPHALEVEL((DGNat)ABS(amount255.0));
}
}
else
{
BLENDMODE(SDL_BLENDMODE_NONE); ALPHALEVEL(255);
}
}

7

I also have the same problem with the slightly amended code from the SDL wiki :

Code:
#include “SDL.h”

int main(int argc, char *argv[]) {
SDL_Window *win = NULL;
SDL_Renderer *renderer = NULL;
SDL_Texture *bitmapTex = NULL;
SDL_Surface *bitmapSurface = NULL;
int posX = 100, posY = 100, width = 320, height = 240;
SDL_Rect rect;

win = SDL_CreateWindow("Hello World", posX, posY, width, height, 0);

renderer = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED);

bitmapSurface = SDL_LoadBMP("img/hello.bmp");
bitmapTex = SDL_CreateTextureFromSurface(renderer, bitmapSurface);
SDL_FreeSurface(bitmapSurface);

while (1) {
    SDL_Event e;
    if (SDL_PollEvent(&e)) {
        if (e.type == SDL_QUIT) {
            break;
        }
    }

    rect.x=10;
    rect.y=10;
    rect.w=50;
    rect.h=50;

    SDL_SetRenderDrawColor(renderer,255,0,255,255);
    SDL_RenderClear(renderer);
    SDL_RenderCopy(renderer, bitmapTex, NULL, NULL);
    SDL_SetRenderDrawColor(renderer,255,0,0,255);
    SDL_RenderFillRect(renderer,&rect);
    SDL_RenderPresent(renderer);
}

However, changing to a non-filled rectangle and all is okay…

8

Think I’ve solved the problem!

Despite protestations to the contrary, it appears that VMPlayer drivers aren’t hardware accelerated, hence the cause of the problem. Changing to a software driver solves the problem…

9

It looks like TextureBlendMode isn’t available for software rendering…