GLGraphics and invalid memory access

ajorum

GLGraphics and invalid memory access

in Contributed Library Questions • 3 years ago

Greetings!

Reusing this thread of mine as this problem has arisen again, but in a new context.

Basically I have a shader, using GLGraphics, that fades a GLTexture to white, and then fades another GLTexture (at the same location) from white. What happens is that, depending on how fast the transitions are done, the application will eventually crash with the following error:

Invalid memory access of location 0x0 eip=0x9893ce57

And this error report pops up:

This is the contents of the shader:

uniform sampler2D backBuffer;

uniform float ratio;

void main() {

vec4 color;

color = texture2D(backBuffer, gl_TexCoord[0].st);

color.r = color.r + ratio;

color.g = color.g + ratio;

color.b = color.b + ratio;

gl_FragColor = color;

}

And this is the code that uses the shader:

// fade src image to white

if (!reverse) {

currentVal += 0.01f;

texFilter.setParameterValue("ratio", currentVal);

src.filter(texFilter, src);

if (currentVal >= 1.0f)

reverse = true;

}

// fade dest image from white

if (reverse) {

currentVal -= 0.01f;

texFilter.setParameterValue("ratio", currentVal);

dest.filter(texFilter, src);

if (currentVal <= 0.0f)

finished = true;

}

I'm certain this problem is related to the use of GLTexture somehow, as it never occurred until I started using them.

Many thanks for any help!

Replies(1)

ajorum

Re: GLGraphics and invalid memory access

3 years ago

For some reason there's a relation to the size of the images. If they are 200 x 200 I can run the above code seven times, and it crashes on the eighth run (one run being every time finished equals true), if I resize them to 400 x 400 it runs three times and crashes on the fourth.

As the class running this code is removed from the ArrayList container whenever it's finished, I'm assuming the GLTextures within are released from memory as well, but I'm starting to reconsider that assumption.

I'm at a loss.

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