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POPyOpenGL, Pygame, and shaders don't seem to cooperate
 

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  1. POPyOpenGL, Pygame, and shaders don't seem to cooperate
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    <p>I've been working through this <a href="http://duriansoftware.com/joe/An-intro-to-modern-OpenGL.-Table-of-Contents.html" rel="nofollow noreferrer">excellent tutorial</a> on modern OpenGL programming, and I'm slowly adapting it to work on PyOpenGL and pygame. However, I'm having the hardest time getting what should be a "trivial" example to work with perspective geometry. Code is as found here:</p> <pre><code>import pygame import numpy as np from OpenGL.GL import * ########################################## # Define the simple pass-through shaders ########################################## import cStringIO vshade = cStringIO.StringIO(""" #version 110 uniform mat4 p_matrix; uniform mat4 mv_matrix; attribute vec4 position; void main() { vec4 eye_position = mv_matrix * position; gl_Position = p_matrix * eye_position; } """) fshade = cStringIO.StringIO(""" #version 110 void main() { gl_FragColor = vec4(1.0,0.0,0.0,1.0); } """) ################################################### # Set up a simple square composed of two triangles ################################################### verts = np.array([[0,0,0,1],[1,0,0,1],[1,1,0,1],[0,1,0,1]]).astype(np.float32) polys = np.array([[0,1,3],[1,2,3]]).astype(np.ushort) mv_matrix = np.eye(4) mv_matrix[:3,-1] = [0,0,2] projection = np.array([ [ 1.071429, 0. , 0. , 0. ], [ 0. , 1.428571, 0. , 0. ], [ 0. , 0. , 1.000489, -0.125031], [ 0. , 0. , 1. , 0. ]]) def _make_shader(stype, src): shader = glCreateShader(stype) glShaderSource(shader, src) glCompileShader(shader) if not glGetShaderiv(shader, GL_COMPILE_STATUS): err = glGetShaderInfoLog(shader) glDeleteShader(shader) raise Exception(err) return shader ################################## # Initialize pygame and opengl ################################## flags = pygame.DOUBLEBUF | pygame.HWSURFACE | pygame.OPENGL pygame.display.set_mode((800,600), flags) glEnable(GL_BLEND) glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) glClearColor(0.5,0.5,0.5,1) glClearDepth(1.0) glDepthFunc(GL_LESS) glEnable(GL_DEPTH_TEST) glEnable(GL_TEXTURE_2D) ###################################### # Make the shaders and programs ###################################### vshade = _make_shader(GL_VERTEX_SHADER, vshade.read()) fshade = _make_shader(GL_FRAGMENT_SHADER, fshade.read()) program = glCreateProgram() glAttachShader(program, vshade) glAttachShader(program, fshade) glLinkProgram(program) ####################################### # Fetch positions, push poly to card ####################################### posidx = glGetAttribLocation(program, "position") pidx = glGetUniformLocation(program, "p_matrix") mvidx = glGetUniformLocation(program, "mv_matrix") vbuf = glGenBuffers(1) ebuf = glGenBuffers(1) glBindBuffer(GL_ARRAY_BUFFER, vbuf) glBufferData(GL_ARRAY_BUFFER, verts.astype(np.float32).ravel(), GL_STATIC_DRAW) glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebuf) glBufferData(GL_ELEMENT_ARRAY_BUFFER, polys.astype(np.uint16).ravel(), GL_STATIC_DRAW) ##################################### # Enter main drawing loop! ##################################### glViewport(0,0,800,600) while True: # Clear the screen glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT) glUseProgram(program) # Push the transforms to the card glUniformMatrix4fv(pidx, 1, GL_TRUE, projection.astype(np.float32)) glUniformMatrix4fv(mvidx, 1, GL_TRUE, mv_matrix.astype(np.float32)) # Enable the position attribute glEnableVertexAttribArray(posidx) glBindBuffer(GL_ARRAY_BUFFER, vbuf) glVertexAttribPointer( posidx, 4, GL_FLOAT, GL_FALSE, 4*4, 0) # Draw the two triangles glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebuf); glDrawElements( GL_TRIANGLES, # mode len(polys)*3, # count GL_UNSIGNED_SHORT, # type 0 # element array buffer offset ) glDisableVertexAttribArray(posidx) #inspect the values -- does it make sense? glBindBuffer(GL_ARRAY_BUFFER, vbuf) l, l2 = (GLfloat*16)() , (GLushort*6)() glGetBufferSubData(GL_ARRAY_BUFFER, 0, 4*4*4, l) print list(l) glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebuf) glGetBufferSubData(GL_ELEMENT_ARRAY_BUFFER, 0, 2*6, l2) print list(l2) glGetUniformfv(program, pidx, l) print list(l) glGetUniformfv(program, mvidx, l) print list(l) pygame.display.flip() </code></pre> <p>Based on my understanding, I should get a red square to cover the upper right quadrant of the screen, but nothing I'm doing seems to affect the fully gray screen. Any insight into what's wrong would be much appreciated!</p>
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    1. USjamesshuang
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    1. COPlease add your code, otherwise we can't help
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    2. COThere's a pastebin link right there with the full code. I even tried a direct pass-through version with no projection in the shader, and still it doesn't work.
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