hi, i have been struggling with point sprites for a long time here are my vertex and fragment shaders
Code :
	const char *fshader =
 
	        "#version 430 core\n"
	        "uniform sampler2D tex1;\n"
	        "out vec4 color;\n"
	        "void main(void)\n"
	        "{\n"
	        "    color = texture2D(tex1, gl_PointCoord);\n"
	        "}";
 
 
	const char *vshader =
	        "#version 430 core\n"
	        "layout (location = 0) in vec4 vertices;\n"
	        "void main(void)\n"
	        "{\n"
		"    gl_PointSize = 60;\n"
	        "    gl_Position = vertices;\n"
	        "}";
i set up the texture by loading it with SOIL. then i use glUniform1i to set the sampler2D variable to 1 and then i make the activetexture unit 1 by glActiveTexture(GL_TEXTURE1) and bind the image to it.
heres my display function
Code :
void display ()
{
	glClear (GL_COLOR_BUFFER_BIT);
 
	glEnable(GL_PROGRAM_POINT_SIZE);
 
	glBindVertexArray (vao);
	glDrawArrays (GL_POINTS, 0, 4);
 
	glDisable(GL_PROGRAM_POINT_SIZE);
}
thanks much in advance