how to use opengl blend mode/functions to brighten/darken a texture.
- by Jigar
Tried this code, but the texture didnot get any lighter.
try {
texture = TextureLoader.getTexture("png",
Game.class.getResourceAsStream("/brick.png"), true, GL_NEAREST);
} catch (IOException e) {
e.printStackTrace();
}
GL11.glBindTexture(GL11.GL_TEXTURE_2D, texture.getTextureID());
glEnable(GL_BLEND);
glBlendFunc(GL_CONSTANT_ALPHA, GL_CONSTANT_ALPHA);
GL14.glBlendColor(1.0f, 1.0f, 1.0f, 0.5f);
glColor4f(1, 1, 1, 0.5f);
GL11.glBegin(GL11.GL_QUADS); // Start Drawing Quads
// Front Face
GL11.glNormal3f(0.0f, 0.0f, 1.0f); // Normal Pointing Towards Viewer
GL11.glTexCoord2f(0.0f, 0.0f);
GL11.glVertex3f(-1.0f, -1.0f, 1.0f); // Point 1 (Front)
GL11.glTexCoord2f(1.0f, 0.0f);
GL11.glVertex3f(1.0f, -1.0f, 1.0f); // Point 2 (Front)
GL11.glTexCoord2f(1.0f, 1.0f);
GL11.glVertex3f(1.0f, 1.0f, 1.0f); // Point 3 (Front)
GL11.glTexCoord2f(0.0f, 1.0f);
GL11.glVertex3f(-1.0f, 1.0f, 1.0f); // Point 4 (Front)
glEnd();
