Hello,

I am playing with GLSL with LWJGL. I tried to render textures via shaders. It worked, but it only works when I don't call glUniform.., and when I call

glUniform.. it crashes:

#
# A fatal error has been detected by the Java Runtime Environment:
#
#  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x56781c67, pid=4032, tid=3204
#
# JRE version: Java(TM) SE Runtime Environment (8.0_05-b13) (build 1.8.0_05-b13)
# Java VM: Java HotSpot(TM) Client VM (25.5-b02 mixed mode windows-x86 )
# Problematic frame:
# C  [ig7icd32.dll+0x171c67]
#
# Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
#
# An error report file with more information is saved as:
# C:\Users\Admin\workspace\GLSL\hs_err_pid4032.log
#
# If you would like to submit a bug report, please visit:
#   http://bugreport.sun.com/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#

I don't know how can it work when I don't even set an uniform...

Anyway, here's my code:

try {
		t = TextureLoader.getTexture("PNG", ResourceLoader.getResourceAsStream("bird2.png"));
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		ShaderLoader shaders = new ShaderLoader("shader.vs", "shader.fs");

		glActiveTexture(GL_TEXTURE0);
		t.bind();
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
		
		while (!Display.isCloseRequested()) {
                        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

			shaders.useProgram();
			//glUniform1i(glGetUniformLocation(shaders.shaderProgram, "texture"), GL_TEXTURE0);
			
			glBegin(GL_QUADS);
			glTexCoord2f(0.0f, 1.0f);
			glVertex2f(-0.5f, -0.5f);
			glTexCoord2f(1.0f, 1.0f);
			glVertex2f(0.5f, -0.5f);
			glTexCoord2f(1.0f, 0.0f);
			glVertex2f(0.5f, 0.5f);
			glTexCoord2f(0.0f, 0.0f);
			glVertex2f(-0.5f, 0.5f);
			
			glEnd();

			
			glUseProgram(0);
			Display.update();
			Display.sync(60);
		}
		
		shaders.delete();
		t.release();
		

ShaderLoader is my class that loads shaders, links and validates the program...

So how does it work without glUniform and why it crashes with glUniform?

Sorry if this is a dumb question, I am still a beginner with GLSL....

Thanks,

MatejaS

EDIT:

Sorry, I forgot to add my shader code.. Maybe it'll help someone...

Vertex shader:

void main() {
	gl_Position = ftransform();
	gl_TexCoord[0] = gl_MultiTexCoord0;
}

Fragment shader:

uniform sampler2D texture;

void main() {
	gl_FragColor = texture2D(texture, gl_TexCoord[0].st);
}

one huge issue is that you are using a variable with the same name as a built-in GLSL function. rename your uniform to something other than 'texture'..

EDIT: and maybe also throw in a #version at the top of those shaders? Looks like you don't like following rules very much, which are in place to make stuff work.

Thanks, @Sponji!

@radioteeth, thanks, I will. As I said, I am still a beginner :)