test

numvia.py

from enum import Enum
import bgl as GL


Triangles = 0
NumVAOs = 1

ArrayBuffer = 0
NumBuffers = 1

vPosition = 0

VAOs = GL.Buffer(GL.GL_INT, [NumVAOs])
Buffers = GL.Buffer(GL.GL_INT, [NumBuffers])
NumVertices = 6


def init():
    GL.glGenVertexArrays(NumVAOs, VAOs)
    GL.glBindVertexArray(VAOs[Triangles])

    vertices = GL.Buffer(GL.GL_FLOAT, [NumVertices, 2], [
        [-0.90, -0.90], [0.85, -0.90], [-0.90, 0.85],
        [0.90, -0.85], [0.90, 0.90], [-0.85, 0.90]
    ])

    GL.glGenBuffers(NumBuffers, Buffers)
    GL.glBindBuffer(GL.GL_ARRAY_BUFFER, Buffers[ArrayBuffer])
    GL.glBufferData(GL.GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL.GL_STATIC_DRAW)

    shaders = GL.ShaderInfo([
        [GL.GL_VERTEX_SHADER, "triangles.vert"],
        [GL.GL_FRAGMENT_SHADER, "triangles.frag"],
        [GL.GL_NONE, None]
    ])

    program = GL.GL_INT(GL.LoadShaders(shaders))
    GL.glUseProgram(program)
    GL.glVertexAttribPointer(vPosition, 2, GL.GL_FLOAT, GL.GL_FALSE, 0, GL.BUFFER_OFFSET(0))
    GL.glEnableVertexAttribArray(vPosition)


def display():
    GL.glClear(GL.GL_COLOR_BUFFER_BIT)
    GL.glBindVertexArray(VAOs[Triangles])
    GL.glDrawArrays(GL.GL_TRIANGLES, 0, NumVertices)
    GL.glFlush()


display()