def createShader(self, shaderName, shaderType, shaderSrc):
"""
Create, load, and compile a shader.
"""
shader = glCreateShaderObjectARB(shaderType)
glShaderSourceARB(shader, shaderSrc)
try:
glCompileShaderARB(shader) # Checks status, raises error if bad.
except:
self.error = True
types = {GL_VERTEX_SHADER:"vertex", GL_FRAGMENT_SHADER:"fragment"}
print ("\n%s %s shader program compilation error" %
(shaderName, types[shaderType]))
print glGetInfoLogARB(shader)
pass
return shader
def createShader(self, shaderName, shaderType, shaderSrc):
"""
Create, load, and compile a shader.
"""
shader = glCreateShaderObjectARB(shaderType)
glShaderSourceARB(shader, shaderSrc)
try:
glCompileShaderARB(shader) # Checks status, raises error if bad.
except:
self.error = True
types = {GL_VERTEX_SHADER:"vertex", GL_FRAGMENT_SHADER:"fragment"}
print ("\n%s %s shader program compilation error" %
(shaderName, types[shaderType]))
print glGetInfoLogARB(shader)
pass
return shader
def __init__(self, shaderName, shaderVertSrc, shaderFragSrc):
# note: on any error, we set self.error, print a message, and return.
# exceptions will be caught by caller and also set self.error,
# but result in less specific printed error messages.
# Configure the max constant RAM used for a "uniform" transforms block.
if UNIFORM_XFORMS:
global N_CONST_XFORMS
oldNCX = N_CONST_XFORMS
maxComponents = glGetInteger(GL_MAX_VERTEX_UNIFORM_COMPONENTS_ARB)
N_CONST_XFORMS = min(
N_CONST_XFORMS,
# Each matrix has 16 components. Leave slack for other vars too.
(maxComponents - _VERTEX_SHADER_GPU_VAR_SLACK) / 16)
if N_CONST_XFORMS <= 0:
print (
"N_CONST_XFORMS not positive, is %d. %d max components." %
(N_CONST_XFORMS, maxComponents))
# Now, we think this means we should use display lists instead.
print "error: not enough shader constant memory"
self.error = True
return
elif N_CONST_XFORMS == oldNCX:
print ("N_CONST_XFORMS unchanged at %d. %d max components." %
(N_CONST_XFORMS, maxComponents))
else:
print (
"N_CONST_XFORMS changed to %d, was %d. %d max components." %
(N_CONST_XFORMS, oldNCX, maxComponents))
pass
pass
# Version statement has to come first in GLSL source.
prefix = """// requires GLSL version 1.20
#version 120
"""
# Insert preprocessor constants before both shader source code strings
# (using a constant number of lines, to preserve GLSL line numbers)
if UNIFORM_XFORMS:
prefix += "#define UNIFORM_XFORMS\n"
prefix += "#define N_CONST_XFORMS %d\n" % N_CONST_XFORMS
elif TEXTURE_XFORMS:
prefix += "#define TEXTURE_XFORMS\n"
prefix += "\n"
else:
prefix += "\n\n"
pass
# GLSL on the nVidia GeForce 7000 only supports constant array
# subscripts, and subscripting by a loop index variable.
if not debug_pref("GLPane: shaders with only constant subscripts?",
Choice_boolean_True, prefs_key = True):
prefix += "#define FULL_SUBSCRIPTING\n"
else:
prefix += "\n" # To keep the shader line numbers unchanged.
pass
if debug_pref("GLPane: simulate GLSL syntax error (next session)",
Choice_boolean_False, prefs_key = True):
prefix += "}\n"
# remove whitespace before and after each prefix line [bruce 090306]
prefix = '\n'.join( [line.strip() for line in prefix.split('\n')] )
assert prefix[-1] == '\n'
# Pass the source strings to the shader compiler.
self.vertShader = self.createShader(shaderName, GL_VERTEX_SHADER,
prefix + shaderVertSrc)
self.fragShader = self.createShader(shaderName, GL_FRAGMENT_SHADER,
prefix + shaderFragSrc)
if self.error: # May be set by createShader.
return # Can't do anything good after an error.
# Link the compiled shaders into a shader program.
self.progObj = glCreateProgramObjectARB()
glAttachObjectARB(self.progObj, self.vertShader)
glAttachObjectARB(self.progObj, self.fragShader)
try:
glLinkProgramARB(self.progObj) # Checks status, raises error if bad.
except:
self.error = True
print shaderName, "shader program link error"
print glGetInfoLogARB(self.progObj)
return # Can't do anything good after an error.
# Optional, may be useful for debugging.
glValidateProgramARB(self.progObj)
status = glGetObjectParameterivARB(self.progObj, GL_VALIDATE_STATUS)
if (not status):
self.error = True
print "Shader program validation error"
print glGetInfoLogARB(self.progObj)
return # Can't do anything good after an error.
return
def __init__(self, shaderName, shaderVertSrc, shaderFragSrc):
# note: on any error, we set self.error, print a message, and return.
# exceptions will be caught by caller and also set self.error,
# but result in less specific printed error messages.
# Configure the max constant RAM used for a "uniform" transforms block.
if UNIFORM_XFORMS:
global N_CONST_XFORMS
oldNCX = N_CONST_XFORMS
maxComponents = glGetInteger(GL_MAX_VERTEX_UNIFORM_COMPONENTS_ARB)
N_CONST_XFORMS = min(
N_CONST_XFORMS,
# Each matrix has 16 components. Leave slack for other vars too.
(maxComponents - _VERTEX_SHADER_GPU_VAR_SLACK) / 16)
if N_CONST_XFORMS <= 0:
print (
"N_CONST_XFORMS not positive, is %d. %d max components." %
(N_CONST_XFORMS, maxComponents))
# Now, we think this means we should use display lists instead.
print "error: not enough shader constant memory"
self.error = True
return
elif N_CONST_XFORMS == oldNCX:
print ("N_CONST_XFORMS unchanged at %d. %d max components." %
(N_CONST_XFORMS, maxComponents))
else:
print (
"N_CONST_XFORMS changed to %d, was %d. %d max components." %
(N_CONST_XFORMS, oldNCX, maxComponents))
pass
pass
# Version statement has to come first in GLSL source.
prefix = """// requires GLSL version 1.20
#version 120
"""
# Insert preprocessor constants before both shader source code strings
# (using a constant number of lines, to preserve GLSL line numbers)
if UNIFORM_XFORMS:
prefix += "#define UNIFORM_XFORMS\n"
prefix += "#define N_CONST_XFORMS %d\n" % N_CONST_XFORMS
elif TEXTURE_XFORMS:
prefix += "#define TEXTURE_XFORMS\n"
prefix += "\n"
else:
prefix += "\n\n"
pass
# GLSL on the nVidia GeForce 7000 only supports constant array
# subscripts, and subscripting by a loop index variable.
if not debug_pref("GLPane: shaders with only constant subscripts?",
Choice_boolean_True, prefs_key = True):
prefix += "#define FULL_SUBSCRIPTING\n"
else:
prefix += "\n" # To keep the shader line numbers unchanged.
pass
if debug_pref("GLPane: simulate GLSL syntax error (next session)",
Choice_boolean_False, prefs_key = True):
prefix += "}\n"
# remove whitespace before and after each prefix line [bruce 090306]
prefix = '\n'.join( [line.strip() for line in prefix.split('\n')] )
assert prefix[-1] == '\n'
# Pass the source strings to the shader compiler.
self.vertShader = self.createShader(shaderName, GL_VERTEX_SHADER,
prefix + shaderVertSrc)
self.fragShader = self.createShader(shaderName, GL_FRAGMENT_SHADER,
prefix + shaderFragSrc)
if self.error: # May be set by createShader.
return # Can't do anything good after an error.
# Link the compiled shaders into a shader program.
self.progObj = glCreateProgramObjectARB()
glAttachObjectARB(self.progObj, self.vertShader)
glAttachObjectARB(self.progObj, self.fragShader)
try:
glLinkProgramARB(self.progObj) # Checks status, raises error if bad.
except:
self.error = True
print shaderName, "shader program link error"
print glGetInfoLogARB(self.progObj)
return # Can't do anything good after an error.
# Optional, may be useful for debugging.
glValidateProgramARB(self.progObj)
status = glGetObjectParameterivARB(self.progObj, GL_VALIDATE_STATUS)
if (not status):
self.error = True
print "Shader program validation error"
print glGetInfoLogARB(self.progObj)
return # Can't do anything good after an error.
return
