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comedy_17

OpenGL (SOLVED) (PyOpenGL) TexSubImage1D Invalid Operation Error

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The goal: I've been working on a simple 2D graphics engine that uses pygame/pyOpenGL to draw to the screen. I've seen multiple ways to include a palette color mapping method using shaders instead of deprecated extensions. I picked one where the image is a 2D texture actually full of indices to texel positions in a 1D texture representing the color palette. I want to accomplish this with the 2D texture loaded normally and the 1D texture loaded as a sub image. However, I ran into an "invalid operation" error just by trying to load the one-dimensional texture. I made a simpler program to show the steps I'm taking to load the texture and in what order:


import pygame
from pygame.locals import *

import OpenGL
from OpenGL.GL import *
from OpenGL.GLU import *


'''---------- Pygame Initialization ----------'''
SCRW = 800
SCRH = 600
CAMW = 256
CAMH = 240

pygame.init()
clock = pygame.time.Clock()
screen = pygame.display.set_mode((SCRW,SCRH),OPENGL | HWSURFACE | DOUBLEBUF,24)
pygame.display.set_caption("Palette Test")

vpx = (CAMW*SCRH) / CAMH
vpy = SCRH
glViewport((SCRW - vpx)/2, (SCRH - vpy)/2, vpx, vpy)


'''---------- OpenGL Initialization ----------'''
glClearColor(0,0,0,0)
glEnable(GL_TEXTURE_1D)
glEnable(GL_TEXTURE_2D)
glEnable(GL_BLEND)
glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA)


'''---------- Load Index Image ----------'''
surface = pygame.image.load("indextex.png")
surface.convert_alpha()
w,h = surface.get_size()
data = pygame.image.tostring(surface,"RGBA",False)
image = glGenTextures(1)
glBindTexture(GL_TEXTURE_2D,image)
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST)
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST)
glTexImage2D(GL_TEXTURE_2D,0,GL_RGBA,w,h,0,GL_RGBA,GL_UNSIGNED_BYTE,data)


'''---------- Load Palette Image ----------'''
surface = pygame.image.load("defaultpalette.png")
surface.convert_alpha()
data = pygame.image.tostring(surface,"RGBA",False)
palette = glGenTextures(1)
glBindTexture(GL_TEXTURE_1D,palette)
glTexParameteri(GL_TEXTURE_1D,GL_TEXTURE_MIN_FILTER,GL_NEAREST)
glTexParameteri(GL_TEXTURE_1D,GL_TEXTURE_MAG_FILTER,GL_NEAREST)
glTexSubImage1D(GL_TEXTURE_1D,0,0,surface.get_width(),GL_RGBA,GL_UNSIGNED_BYTE,data)




Ignoring whether or not it's exactly optimized to have the index texture in RGBA format or to have an alpha channel at all, as far as I can tell this code should work up to this point, however at the line where glTexSubImage1D is called I receive the following error:


GLError: GLError(
err = 1282,
description = 'invalid operation',
baseOperation = glTexSubImage1D,
pyArgs = (
GL_TEXTURE_1D,
0,
0,
8,
GL_RGBA,
GL_UNSIGNED_BYTE,
'\x05\x05\x05\xff\xf8\xf8\xf8\xff\xff...,
),
cArgs = (
GL_TEXTURE_1D,
0,
0,
8,
GL_RGBA,
GL_UNSIGNED_BYTE,
'\x05\x05\x05\xff\xf8\xf8\xf8\xff\xff...,
),
cArguments = (
GL_TEXTURE_1D,
0,
0,
8,
GL_RGBA,
GL_UNSIGNED_BYTE,
'\x05\x05\x05\xff\xf8\xf8\xf8\xff\xff...,
)
)




Considering it's right where the texture is loaded, I'm hoping it's something simple that I'm just missing. I've seen plenty of people trying what this code is trying but I wasn't able to find anyone with this problem.

Other Possibly Important Info:
OS - Mac OSX 10.5.8
Python - 2.6
Pygame - 1.9
PyOpenGL - 3.0.1

[Edited by - comedy_17 on October 12, 2010 6:53:17 PM]

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Why are you trying to use glTexSubImage instead of just glTexImage? According to the doc:

Quote:

GL_INVALID_OPERATION is generated if the texture array has not
been defined by a previous glTexImage1D operation.


Your code doesn't appear to have satisfied this condition. I thought the subimage commands were only intended to replace a small part of an existing image, but this doesn't appear to be what you're trying to do.

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What a silly misunderstanding. I have never used one-dimensional textures before and I was just misunderstanding the function's purpose. Thanks a bunch.

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