[SOLVED]Rendering font with LWJGL

[DDDBOMBER]

I am having some trouble rendering fonts with LWJGL, i have a 128x128 png with all the letters drawn out, my current code is

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package com.bomberBox.game.screen; import org.lwjgl.opengl.GL11; import com.bomberBox.game.TextureHandler; public class Font {    private static final String chars = "" + //         "ABCDEFGHIJ" +//         "KLMNOPQRST" +//         "UVWXYZabcd" +//         "efghijklmn" +//         "opqrstuvwx" +//         "yz/#:     " +//         "0123456789";        public static void draw(String string, int x, int y, float r, float g, float b, float a) {       for (int i = 0; i < string.length(); i++) {          int ch = chars.indexOf(string.charAt(i));          if (ch < 0) continue;          int xx = (ch % 10) * 12;          int yy = (ch / 10) * 16;          int xd = x + i * 12;            GL11.glPushMatrix();          GL11.glColor4f(r, g, b, a);          TextureHandler.font.bind();            GL11.glBegin(GL11.GL_QUADS);            GL11.glTexCoord2f(xx, yy); GL11.glVertex2f(xd, y);            GL11.glTexCoord2f(xx + 10, yy); GL11.glVertex2f(xd+20, y);            GL11.glTexCoord2f(xx + 10, yy + 16); GL11.glVertex2f(xd+20, y+32);            GL11.glTexCoord2f(xx, yy + 16); GL11.glVertex2f(xd, y+32);            GL11.glEnd();            GL11.glPopMatrix();       }    } }

It renders some white bars but not the font or words... I am struggling to see where i've gone wrong...

[Riven]

Texcoords are in the range 0..1

[princec]

You forgot

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glEnable(GL_TEXTURE_2D); glEnable(GL_BLEND); glBlendFunc(GL_SRC_ALPHA, GL_ONE);

Cas

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[DDDBOMBER]

Texcoords are in the range 0..1

Thanks, completely forgot that, fixed it now

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public static void draw(String string, int x, int y, float r, float g, float b, float a) {       for (int i = 0; i < string.length(); i++) {          int ch = chars.indexOf(string.charAt(i));          if (ch < 0) continue;          int xx = (ch % 10) * 12;          int yy = (ch / 10) * 16;          int xd = x + i * 12;            GL11.glPushMatrix();          GL11.glColor4f(r, g, b, a);          TextureHandler.font.bind();            GL11.glBegin(GL11.GL_QUADS);            float left = (float) (1.0*(xx/128.0));            float right = (float) (1.0*((xx+10)/128.0));            float top = (float) (1.0*(yy/128.0));            float bottom = (float) (1.0*((yy+16)/128.0));            GL11.glTexCoord2f(left, top); GL11.glVertex2f(xd, y);            GL11.glTexCoord2f(right, top); GL11.glVertex2f(xd+10, y);            GL11.glTexCoord2f(right, bottom); GL11.glVertex2f(xd+10, y+16);            GL11.glTexCoord2f(left, bottom); GL11.glVertex2f(xd, y+16);            GL11.glEnd();            GL11.glPopMatrix();       }    }

[davedes]

Performance tips:

• Reduce the calls to glBegin/glEnd by only calling it once outside your loop. If you use it for every character in a string, you will very quickly run into performance problems.
  
• Same for binding textures; no point in doing them every iteration. Instead; call it once at the beginning of your method and (if you don't already) cache the last bound texture to minimize redundant calls to glBindTexture.
• Ideally use vertex arrays or VBOs to further improve performance.
• Don't push/pop matrices when it's not necessary.