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Thread: point sprites, help please...

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  1. #1
    Intern Contributor
    Join Date
    Jun 2013
    Posts
    70

    Question point sprites, help please...

    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

  2. #2
    Junior Member Newbie
    Join Date
    Nov 2008
    Posts
    15
    Have a look at the shader at the top of https://github.com/sphair/ClanLib/bl...ources/app.cpp
    Remember to set
    glPointSize(point_size);
    glPointParameterf(GL_POINT_FADE_THRESHOLD_SIZE, point_fade_treshold_size);
    glEnable(GL_VERTEX_PROGRAM_POINT_SIZE);

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