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hello_cube_pygame.py
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hello_cube_pygame.py
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from OpenGL.GL import *
from ctypes import c_void_p, sizeof
import glm, math
import pygame
sh_vert = """
#version 460 core
layout (location = 0) in vec4 a_position;
layout (location = 1) in vec3 a_normal;
layout (location = 2) in vec3 a_uvw;
out vec3 v_pos;
out vec3 v_nv;
out vec3 v_uvw;
layout (location = 0) uniform mat4 u_projection;
layout (location = 1) uniform mat4 u_view;
layout (location = 2) uniform mat4 u_model;
void main()
{
mat3 normal_matrix = transpose(inverse(mat3(u_model)));
vec4 world_pos = u_model * a_position;
v_pos = world_pos.xyz;
v_nv = normal_matrix * a_normal;
v_uvw = a_uvw;
gl_Position = u_projection * u_view * world_pos;
}
"""
sh_frag = """
#version 460 core
in vec3 v_pos;
in vec3 v_nv;
in vec3 v_uvw;
out vec4 frag_color;
layout (location = 1) uniform mat4 u_view;
layout (location = 3) uniform vec3 u_light_direction = vec3(0.0, 1.0, 0.0);
layout (location = 4) uniform vec3 u_light_intensity = vec3(0.5);
vec3 HUEtoRGB(in float H)
{
float R = abs(H * 6.0 - 3.0) - 1.0;
float G = 2.0 - abs(H * 6.0 - 2.0);
float B = 2.0 - abs(H * 6.0 - 4.0);
return clamp( vec3(R,G,B), 0.0, 1.0 );
}
void main()
{
vec4 color = vec4(HUEtoRGB(v_uvw.z), 1.0);
vec3 L = -normalize(u_light_direction);
vec3 eye = inverse(u_view)[3].xyz;
vec3 V = normalize(eye - v_pos);
float face = sign(dot(v_nv, V));
vec3 N = normalize(v_nv) * face;
vec3 H = normalize(V + L);
float ka = u_light_intensity[0];
float kd = max(0.0, dot(N, L)) * u_light_intensity[1];
float NdotH = max(0.0, dot(N, H));
float sh = 100.0;
float ks = pow(NdotH, sh) * u_light_intensity[2];
frag_color = vec4(color.rgb * (ka + kd + ks), color.a);
}
"""
pygame.init()
pygame.display.gl_set_attribute(pygame.GL_MULTISAMPLEBUFFERS, 1)
pygame.display.gl_set_attribute(pygame.GL_MULTISAMPLESAMPLES, 8)
window = pygame.display.set_mode((640, 480), pygame.DOUBLEBUF | pygame.OPENGL | pygame.RESIZABLE)
clock = pygame.time.Clock()
vendor, renderer = glGetString(GL_VENDOR).decode("utf-8"), glGetString(GL_RENDERER).decode("utf-8")
version, glsl_version = glGetString(GL_VERSION).decode("utf-8"), glGetString(GL_SHADING_LANGUAGE_VERSION).decode("utf-8")
major, minor = glGetInteger(GL_MAJOR_VERSION), glGetInteger(GL_MINOR_VERSION)
extensions = [glGetStringi(GL_EXTENSIONS, i) for i in range(glGetInteger(GL_NUM_EXTENSIONS))]
print(f"\n{vendor} / {renderer}\n OpenGL: {version}\n GLSL: {glsl_version}\n Context {major}.{minor}\n")
@GLDEBUGPROC
def __CB_OpenGL_DebugMessage(source, type, id, severity, length, message, userParam):
msg = message[0:length]
print(msg.decode("utf-8"))
glDebugMessageCallback(__CB_OpenGL_DebugMessage, None)
errors_only = False
if errors_only:
glDebugMessageControl(GL_DONT_CARE, GL_DONT_CARE, GL_DONT_CARE, 0, None, GL_FALSE)
glDebugMessageControl(GL_DEBUG_SOURCE_API, GL_DEBUG_TYPE_ERROR, GL_DONT_CARE, 0, None, GL_TRUE)
else:
glDebugMessageControl(GL_DONT_CARE, GL_DONT_CARE, GL_DONT_CARE, 0, None, GL_TRUE)
glEnable(GL_DEBUG_OUTPUT)
glEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS)
glDebugMessageInsert(GL_DEBUG_SOURCE_APPLICATION, GL_DEBUG_TYPE_MARKER, 0, GL_DEBUG_SEVERITY_NOTIFICATION, -1, "Starting debug messaging service")
v = [[-1,-1,1], [1,-1,1], [1,1,1], [-1,1,1], [-1,-1,-1], [1,-1,-1], [1,1,-1], [-1,1,-1]]
t = [[0, 1], [1, 1], [1, 0], [0, 0]]
n = [[0,0,1], [1,0,0], [0,0,-1], [-1,0,0], [0,1,0], [0,-1,0]]
e = [[0,1,2,3], [1,5,6,2], [5,4,7,6], [4,0,3,7], [3,2,6,7], [1,0,4,5]]
l = 1/math.sqrt(2)
indices = [si*4+[0, 1, 2, 0, 2, 3][vi] for si in range(6) for vi in range(6)]
attributes = []
for si in range(len(e)):
for qi, vi in enumerate(e[si]):
attributes += [v[vi][0]*l, v[vi][1]*l,v[vi][2]*l, *n[si], *t[qi], si/6]
attributes = (GLfloat * len(attributes))(*attributes)
indices = (GLuint * len(indices))(*indices)
no_of_indices = len(indices)
vao = glGenVertexArrays(1)
vbo = glGenBuffers(1)
glBindVertexArray(vao)
glBindBuffer(GL_ARRAY_BUFFER, vbo)
glBufferData(GL_ARRAY_BUFFER, attributes, GL_STATIC_DRAW)
glVertexAttribPointer(0, 3, GL_FLOAT, False, 9 * sizeof(GLfloat), None)
glVertexAttribPointer(1, 3, GL_FLOAT, False, 9 * sizeof(GLfloat), c_void_p(3 * sizeof(GLfloat)))
glVertexAttribPointer(2, 3, GL_FLOAT, False, 9 * sizeof(GLfloat), c_void_p(6 * sizeof(GLfloat)))
glEnableVertexAttribArray(0)
glEnableVertexAttribArray(1)
glEnableVertexAttribArray(2)
ebo = glGenBuffers(1)
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo)
glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices, GL_STATIC_DRAW)
program_obj = glCreateProgram()
for sh_type, sh_code in [(GL_VERTEX_SHADER, sh_vert), (GL_FRAGMENT_SHADER, sh_frag)]:
shader_obj = glCreateShader(sh_type)
glShaderSource(shader_obj, sh_code)
glCompileShader(shader_obj)
if not glGetShaderiv(shader_obj, GL_COMPILE_STATUS):
raise Exception(glGetShaderInfoLog(shader_obj).replace(b'\\n', b'\n'))
glAttachShader(program_obj, shader_obj)
glLinkProgram(program_obj)
if not glGetProgramiv(program_obj, GL_LINK_STATUS):
raise Exception(glGetProgramInfoLog(program_obj).replace(b'\\n', b'\n'))
glUseProgram(program_obj)
glUniform3fv(3, 1, [-0.5, 1.0, -0.5])
glUniform3f(4, 0.2, 0.8, 0.4)
glEnable(GL_MULTISAMPLE) # default
glEnable(GL_DEPTH_TEST)
glClearColor(0.0, 0.0, 0.0, 0.0)
start_time = pygame.time.get_ticks()
aspect = 640 / 480
run = True
while run:
clock.tick(60)
for event in pygame.event.get():
if event.type == pygame.QUIT:
run = False
elif event.type == pygame.VIDEORESIZE:
glViewport(0, 0, event.w, event.h)
aspect = event.w / event.h
elapsed_time = (pygame.time.get_ticks() - start_time) / 1000
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
projection_matrix = glm.perspective(glm.radians(90), aspect, 0.1, 10)
view_matrix = glm.lookAt(glm.vec3(0, -3, 0), glm.vec3(0, 0, 0), glm.vec3(0, 0, 1))
model_matrix = glm.rotate(glm.mat4(1), glm.radians(elapsed_time * 90), glm.vec3(0.5, 0, 1))
glUniformMatrix4fv(0, 1, GL_FALSE, glm.value_ptr(projection_matrix))
glUniformMatrix4fv(1, 1, GL_FALSE, glm.value_ptr(view_matrix))
glUniformMatrix4fv(2, 1, GL_FALSE, glm.value_ptr(model_matrix))
glDrawElements(GL_TRIANGLES, no_of_indices, GL_UNSIGNED_INT, None)
pygame.display.flip()
pygame.quit()
exit()