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raylib-python-cffi/examples/others/rlgl_standalone.py
Richard Smith a33f4fcc9a update examples
2024-11-17 01:17:05 +00:00

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#*******************************************************************************************
#
# raylib [rlgl] example - Using rlgl module as standalone module
#
# rlgl library is an abstraction layer for multiple OpenGL versions (1.1, 2.1, 3.3 Core, ES 2.0)
# that provides a pseudo-OpenGL 1.1 immediate-mode style API (rlVertex, rlTranslate, rlRotate...)
#
# WARNING: This example is intended only for PLATFORM_DESKTOP and OpenGL 3.3 Core profile.
# It could work on other platforms if redesigned for those platforms (out-of-scope)
#
# DEPENDENCIES:
# glfw3 - Windows and context initialization library
# rlgl.h - OpenGL abstraction layer to OpenGL 1.1, 3.3 or ES2
# glad.h - OpenGL extensions initialization library (required by rlgl)
# raymath.h - 3D math library
#
# WINDOWS COMPILATION:
# gcc -o rlgl_standalone.exe rlgl_standalone.c -s -Iexternal\include -I..\..\src \
# -L. -Lexternal\lib -lglfw3 -lopengl32 -lgdi32 -Wall -std=c99 -DGRAPHICS_API_OPENGL_33
#
# APPLE COMPILATION:
# gcc -o rlgl_standalone rlgl_standalone.c -I../../src -Iexternal/include -Lexternal/lib \
# -lglfw3 -framework CoreVideo -framework OpenGL -framework IOKit -framework Cocoa
# -Wno-deprecated-declarations -std=c99 -DGRAPHICS_API_OPENGL_33
#
#
# LICENSE: zlib/libpng
#
# This example is licensed under an unmodified zlib/libpng license, which is an OSI-certified,
# BSD-like license that allows static linking with closed source software:
#
# Copyright (c) 2014-2023 Ramon Santamaria (@raysan5)
#
# This software is provided "as-is", without any express or implied warranty. In no event
# will the authors be held liable for any damages arising from the use of this software.
#
# Permission is granted to anyone to use this software for any purpose, including commercial
# applications, and to alter it and redistribute it freely, subject to the following restrictions:
#
# 1. The origin of this software must not be misrepresented you must not claim that you
# wrote the original software. If you use this software in a product, an acknowledgment
# in the product documentation would be appreciated but is not required.
#
# 2. Altered source versions must be plainly marked as such, and must not be misrepresented
# as being the original software.
#
# 3. This notice may not be removed or altered from any source distribution.
#
#*******************************************************************************************/
# NOTE: rlgl can be configured just re-defining the following values:
# define RL_DEFAULT_BATCH_BUFFER_ELEMENTS 8192 # Default internal render batch elements limits
# define RL_DEFAULT_BATCH_BUFFERS 1 # Default number of batch buffers (multi-buffering)
# define RL_DEFAULT_BATCH_DRAWCALLS 256 # Default number of batch draw calls (by state changes: mode, texture)
# define RL_DEFAULT_BATCH_MAX_TEXTURE_UNITS 4 # Maximum number of textures units that can be activated on batch drawing (SetShaderValueTexture())
# define RL_MAX_MATRIX_STACK_SIZE 32 # Maximum size of internal Matrix stack
# define RL_MAX_SHADER_LOCATIONS 32 # Maximum number of shader locations supported
# define RL_CULL_DISTANCE_NEAR 0.01 # Default projection matrix near cull distance
# define RL_CULL_DISTANCE_FAR 1000.0 # Default projection matrix far cull distance
import sys
import dataclasses
import pyray
from raylib import ffi, rl
from raylib.defines import (
GLFW_TRUE,
GLFW_SAMPLES, GLFW_DEPTH_BITS, GLFW_CONTEXT_VERSION_MAJOR, GLFW_CONTEXT_VERSION_MINOR, GLFW_OPENGL_PROFILE,
GLFW_OPENGL_CORE_PROFILE, GLFW_OPENGL_FORWARD_COMPAT, RL_PROJECTION, RL_MODELVIEW, DEG2RAD, RL_LINES, RL_TRIANGLES,
GLFW_KEY_ESCAPE, GLFW_PRESS,
)
from raylib.colors import (
RAYWHITE,
RED,
DARKGRAY
)
#----------------------------------------------------------------------------------
# Structures Definition
#----------------------------------------------------------------------------------
# Color, 4 components, R8G8B8A8 (32bit)
@dataclasses.dataclass
class Color:
r: int
g: int
b: int
a: int
# Camera type, defines a camera position/orientation in 3d space
@dataclasses.dataclass
class Camera:
position: pyray.Vector3 # Camera position
target: pyray.Vector3 # Camera target it looks-at
up: pyray.Vector3 # Camera up vector (rotation over its axis)
fovy: float # Camera field-of-view apperture in Y (degrees) in perspective, used as near plane width in orthographic
projection: int # Camera projection: CAMERA_PERSPECTIVE or CAMERA_ORTHOGRAPHIC
#----------------------------------------------------------------------------------
# Module specific Functions Declaration
#----------------------------------------------------------------------------------
# static void ErrorCallback(int error, const char *description)
# static void KeyCallback(GLFWwindow *window, int key, int scancode, int action, int mods)
# Drawing functions (uses rlgl functionality)
# static void DrawGrid(int slices, float spacing)
# static void DrawCube(Vector3 position, float width, float height, float length, Color color)
# static void DrawCubeWires(Vector3 position, float width, float height, float length, Color color)
# static void DrawRectangleV(Vector2 position, Vector2 size, Color color)
# NOTE: We use raymath to get this functionality but it could be implemented in this module
#static Matrix MatrixIdentity(void)
#static Matrix MatrixOrtho(double left, double right, double bottom, double top, double near, double far)
#static Matrix MatrixPerspective(double fovy, double aspect, double near, double far)
#static Matrix MatrixLookAt(Vector3 eye, Vector3 target, Vector3 up)
# GLFW3: Error callback
@ffi.callback("void(int, const char *)")
def ErrorCallback(error: int, description: bytes):
print("%r" % description, file=sys.stderr)
# GLFW3: Keyboard callback
@ffi.callback("void(GLFWwindow *, int, int, int, int)")
def KeyCallback(window, key: int, scancode: int, action: int, mods: int):
if key == GLFW_KEY_ESCAPE and action == GLFW_PRESS:
rl.glfwSetWindowShouldClose(window, GLFW_TRUE)
# Draw rectangle using rlgl OpenGL 1.1 style coding (translated to OpenGL 3.3 internally)
def DrawRectangleV(position, size, color: Color):
rl.rlBegin(RL_TRIANGLES)
rl.rlColor4ub(color.r, color.g, color.b, color.a)
rl.rlVertex2f(position.x, position.y)
rl.rlVertex2f(position.x, position.y + size.y)
rl.rlVertex2f(position.x + size.x, position.y + size.y)
rl.rlVertex2f(position.x, position.y)
rl.rlVertex2f(position.x + size.x, position.y + size.y)
rl.rlVertex2f(position.x + size.x, position.y)
rl.rlEnd()
# Draw a grid centered at (0, 0, 0)
def DrawGrid(slices: int, spacing: float):
half_slices = slices // 2
rl.rlBegin(RL_LINES)
for i in range(half_slices * -1, half_slices+1):
if i == 0:
rl.rlColor3f(0.5, 0.5, 0.5)
rl.rlColor3f(0.5, 0.5, 0.5)
rl.rlColor3f(0.5, 0.5, 0.5)
rl.rlColor3f(0.5, 0.5, 0.5)
else:
rl.rlColor3f(0.75, 0.75, 0.75)
rl.rlColor3f(0.75, 0.75, 0.75)
rl.rlColor3f(0.75, 0.75, 0.75)
rl.rlColor3f(0.75, 0.75, 0.75)
rl.rlVertex3f(float(i)*spacing, 0.0, float(half_slices)*-1.0*spacing)
rl.rlVertex3f(float(i)*spacing, 0.0, float(half_slices)*spacing)
rl.rlVertex3f(float(half_slices)*-1.0*spacing, 0.0, float(i)*spacing)
rl.rlVertex3f(float(half_slices)*spacing, 0.0, float(i)*spacing)
rl.rlEnd()
# Draw cube
# NOTE: Cube position is the center position
def DrawCube(position, width: float, height: float, length: float, color: Color):
x: float = 0.0
y: float = 0.0
z: float = 0.0
rl.rlPushMatrix()
# NOTE: Be careful! Function order matters (rotate -> scale -> translate)
rl.rlTranslatef(position.x, position.y, position.z)
#rlScalef(2.0f, 2.0f, 2.0f)
#rlRotatef(45, 0, 1, 0)
rl.rlBegin(RL_TRIANGLES)
rl.rlColor4ub(color.r, color.g, color.b, color.a)
# Front Face -----------------------------------------------------
rl.rlVertex3f(x-width/2, y-height/2, z+length/2) # Bottom Left
rl.rlVertex3f(x+width/2, y-height/2, z+length/2) # Bottom Right
rl.rlVertex3f(x-width/2, y+height/2, z+length/2) # Top Left
rl.rlVertex3f(x+width/2, y+height/2, z+length/2) # Top Right
rl.rlVertex3f(x-width/2, y+height/2, z+length/2) # Top Left
rl.rlVertex3f(x+width/2, y-height/2, z+length/2) # Bottom Right
# Back Face ------------------------------------------------------
rl.rlVertex3f(x-width/2, y-height/2, z-length/2) # Bottom Left
rl.rlVertex3f(x-width/2, y+height/2, z-length/2) # Top Left
rl.rlVertex3f(x+width/2, y-height/2, z-length/2) # Bottom Right
rl.rlVertex3f(x+width/2, y+height/2, z-length/2) # Top Right
rl.rlVertex3f(x+width/2, y-height/2, z-length/2) # Bottom Right
rl.rlVertex3f(x-width/2, y+height/2, z-length/2) # Top Left
# Top Face -------------------------------------------------------
rl.rlVertex3f(x-width/2, y+height/2, z-length/2) # Top Left
rl.rlVertex3f(x-width/2, y+height/2, z+length/2) # Bottom Left
rl.rlVertex3f(x+width/2, y+height/2, z+length/2) # Bottom Right
rl.rlVertex3f(x+width/2, y+height/2, z-length/2) # Top Right
rl.rlVertex3f(x-width/2, y+height/2, z-length/2) # Top Left
rl.rlVertex3f(x+width/2, y+height/2, z+length/2) # Bottom Right
# Bottom Face ----------------------------------------------------
rl.rlVertex3f(x-width/2, y-height/2, z-length/2) # Top Left
rl.rlVertex3f(x+width/2, y-height/2, z+length/2) # Bottom Right
rl.rlVertex3f(x-width/2, y-height/2, z+length/2) # Bottom Left
rl.rlVertex3f(x+width/2, y-height/2, z-length/2) # Top Right
rl.rlVertex3f(x+width/2, y-height/2, z+length/2) # Bottom Right
rl.rlVertex3f(x-width/2, y-height/2, z-length/2) # Top Left
# Right face -----------------------------------------------------
rl.rlVertex3f(x+width/2, y-height/2, z-length/2) # Bottom Right
rl.rlVertex3f(x+width/2, y+height/2, z-length/2) # Top Right
rl.rlVertex3f(x+width/2, y+height/2, z+length/2) # Top Left
rl.rlVertex3f(x+width/2, y-height/2, z+length/2) # Bottom Left
rl.rlVertex3f(x+width/2, y-height/2, z-length/2) # Bottom Right
rl.rlVertex3f(x+width/2, y+height/2, z+length/2) # Top Left
# Left Face ------------------------------------------------------
rl.rlVertex3f(x-width/2, y-height/2, z-length/2) # Bottom Right
rl.rlVertex3f(x-width/2, y+height/2, z+length/2) # Top Left
rl.rlVertex3f(x-width/2, y+height/2, z-length/2) # Top Right
rl.rlVertex3f(x-width/2, y-height/2, z+length/2) # Bottom Left
rl.rlVertex3f(x-width/2, y+height/2, z+length/2) # Top Left
rl.rlVertex3f(x-width/2, y-height/2, z-length/2) # Bottom Right
rl.rlEnd()
rl.rlPopMatrix()
#Draw cube wires
def DrawCubeWires(position, width: float, height: float, length: float, color: Color):
x: float = 0.0
y: float = 0.0
z: float = 0.0
rl.rlPushMatrix()
rl.rlTranslatef(position.x, position.y, position.z)
#rlRotatef(45, 0, 1, 0)
rl.rlBegin(RL_LINES)
rl.rlColor4ub(color.r, color.g, color.b, color.a)
# Front Face -----------------------------------------------------
# Bottom Line
rl.rlVertex3f(x-width/2, y-height/2, z+length/2) # Bottom Left
rl.rlVertex3f(x+width/2, y-height/2, z+length/2) # Bottom Right
# Left Line
rl.rlVertex3f(x+width/2, y-height/2, z+length/2) # Bottom Right
rl.rlVertex3f(x+width/2, y+height/2, z+length/2) # Top Right
# Top Line
rl.rlVertex3f(x+width/2, y+height/2, z+length/2) # Top Right
rl.rlVertex3f(x-width/2, y+height/2, z+length/2) # Top Left
# Right Line
rl.rlVertex3f(x-width/2, y+height/2, z+length/2) # Top Left
rl.rlVertex3f(x-width/2, y-height/2, z+length/2) # Bottom Left
# Back Face ------------------------------------------------------
# Bottom Line
rl.rlVertex3f(x-width/2, y-height/2, z-length/2) # Bottom Left
rl.rlVertex3f(x+width/2, y-height/2, z-length/2) # Bottom Right
# Left Line
rl.rlVertex3f(x+width/2, y-height/2, z-length/2) # Bottom Right
rl.rlVertex3f(x+width/2, y+height/2, z-length/2) # Top Right
# Top Line
rl.rlVertex3f(x+width/2, y+height/2, z-length/2) # Top Right
rl.rlVertex3f(x-width/2, y+height/2, z-length/2) # Top Left
# Right Line
rl.rlVertex3f(x-width/2, y+height/2, z-length/2) # Top Left
rl.rlVertex3f(x-width/2, y-height/2, z-length/2) # Bottom Left
# Top Face -------------------------------------------------------
# Left Line
rl.rlVertex3f(x-width/2, y+height/2, z+length/2) # Top Left Front
rl.rlVertex3f(x-width/2, y+height/2, z-length/2) # Top Left Back
# Right Line
rl.rlVertex3f(x+width/2, y+height/2, z+length/2) # Top Right Front
rl.rlVertex3f(x+width/2, y+height/2, z-length/2) # Top Right Back
# Bottom Face ---------------------------------------------------
# Left Line
rl.rlVertex3f(x-width/2, y-height/2, z+length/2) # Top Left Front
rl.rlVertex3f(x-width/2, y-height/2, z-length/2) # Top Left Back
# Right Line
rl.rlVertex3f(x+width/2, y-height/2, z+length/2) # Top Right Front
rl.rlVertex3f(x+width/2, y-height/2, z-length/2) # Top Right Back
rl.rlEnd()
rl.rlPopMatrix()
# Initialization
#--------------------------------------------------------------------------------------
screenWidth: int = 800
screenHeight: int = 450
# GLFW3 Initialization + OpenGL 3.3 Context + Extensions
#--------------------------------------------------------
rl.glfwSetErrorCallback(ErrorCallback)
if not rl.glfwInit():
print("GLFW3: Can not initialize GLFW")
exit(1)
print("GLFW3: GLFW initialized successfully")
rl.glfwWindowHint(GLFW_SAMPLES, 4)
rl.glfwWindowHint(GLFW_DEPTH_BITS, 16)
# WARNING: OpenGL 3.3 Core profile only
rl.glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3)
rl.glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3)
rl.glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE)
#glfwWindowHint(GLFW_OPENGL_DEBUG_CONTEXT, GL_TRUE)
#if defined(__APPLE__)
rl.glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GLFW_TRUE)
#endif
window = rl.glfwCreateWindow(screenWidth, screenHeight, b"rlgl standalone", ffi.NULL, ffi.NULL)
if not window:
print("Cannot create GLFW3 Window.")
rl.glfwTerminate()
exit(2)
print("GLFW3: Window created successfully")
rl.glfwSetWindowPos(window, 200, 200)
rl.glfwSetKeyCallback(window, KeyCallback)
rl.glfwMakeContextCurrent(window)
rl.glfwSwapInterval(0)
# Load OpenGL 3.3 supported extensions
rl.rlLoadExtensions(ffi.addressof(rl, 'glfwGetProcAddress'))
#--------------------------------------------------------
# Initialize OpenGL context (states and resources)
rl.rlglInit(screenWidth, screenHeight)
# Initialize viewport and internal projection/modelview matrices
rl.rlViewport(0, 0, screenWidth, screenHeight)
rl.rlMatrixMode(RL_PROJECTION) # Switch to PROJECTION matrix
rl.rlLoadIdentity() # Reset current matrix (PROJECTION)
rl.rlOrtho(0, screenWidth, screenHeight, 0, 0.0, 1.0) # Orthographic projection with top-left corner at (0,0)
rl.rlMatrixMode(RL_MODELVIEW) # Switch back to MODELVIEW matrix
rl.rlLoadIdentity() # Reset current matrix (MODELVIEW)
rl.rlClearColor(245, 245, 245, 255) # Define clear color
rl.rlEnableDepthTest() # Enable DEPTH_TEST for 3D
camera = Camera(
position = pyray.Vector3(5.0, 5.0, 5.0), # Camera position
target = pyray.Vector3(0.0, 0.0, 0.0), # Camera looking at point
up = pyray.Vector3(0.0, 1.0, 0.0), # Camera up vector (rotation towards target)
fovy = 45.0, # Camera field-of-view Y
projection=rl.CAMERA_PERSPECTIVE)
cubePosition = pyray.Vector3(0.0, 0.0, 0.0) # Cube default position (center)
#--------------------------------------------------------------------------------------
RLGL_SET_MATRIX_MANUALLY = True
# Main game loop
while not rl.glfwWindowShouldClose(window):
# Update
#----------------------------------------------------------------------------------
#camera.position.x += 0.01f
#----------------------------------------------------------------------------------
# Draw
#----------------------------------------------------------------------------------
rl.rlClearScreenBuffers() # Clear current framebuffer
# Draw '3D' elements in the scene
#-----------------------------------------------
# Calculate projection matrix (from perspective) and view matrix from camera look at
matProj = rl.MatrixPerspective(camera.fovy*DEG2RAD, float(screenWidth)/float(screenHeight), 0.01, 1000.0)
matView = rl.MatrixLookAt(camera.position, camera.target, camera.up)
rl.rlSetMatrixModelview(matView) # Set internal modelview matrix (default shader)
rl.rlSetMatrixProjection(matProj) # Set internal projection matrix (default shader)
DrawCube(cubePosition, 2.0, 2.0, 2.0, Color(*RED))
DrawCubeWires(cubePosition, 2.0, 2.0, 2.0, Color(*RAYWHITE))
DrawGrid(10, 1.0)
# Draw internal render batch buffers (3D data)
rl.rlDrawRenderBatchActive()
#-----------------------------------------------
# Draw '2D' elements in the scene (GUI)
#-----------------------------------------------
if RLGL_SET_MATRIX_MANUALLY:
matProj = rl.MatrixOrtho(0.0, screenWidth, screenHeight, 0.0, 0.0, 1.0)
matView = rl.MatrixIdentity()
rl.rlSetMatrixModelview(matView) # Set internal modelview matrix (default shader)
rl.rlSetMatrixProjection(matProj) # Set internal projection matrix (default shader)
else: # Let rlgl generate and multiply matrix internally
rl.rlMatrixMode(RL_PROJECTION) # Enable internal projection matrix
rl.rlLoadIdentity() # Reset internal projection matrix
rl.rlOrtho(0.0, screenWidth, screenHeight, 0.0, 0.0, 1.0) # Recalculate internal projection matrix
rl.rlMatrixMode(RL_MODELVIEW) # Enable internal modelview matrix
rl.rlLoadIdentity() # Reset internal modelview matrix
DrawRectangleV(pyray.Vector2(10.0, 10.0), pyray.Vector2(780.0, 20.0), Color(*DARKGRAY))
# Draw internal render batch buffers (2D data)
rl.rlDrawRenderBatchActive()
#-----------------------------------------------
rl.glfwSwapBuffers(window)
rl.glfwPollEvents()
#----------------------------------------------------------------------------------
# De-Initialization
#--------------------------------------------------------------------------------------
rl.rlglClose() # Unload rlgl internal buffers and default shader/texture
rl.glfwDestroyWindow(window) # Close window
rl.glfwTerminate() # Free GLFW3 resources
#--------------------------------------------------------------------------------------
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