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package funhalla
import gl "vendor:OpenGL"
import "vendor:glfw"
import "base:intrinsics"
import "base:runtime"
import "core:c/libc"
import "core:fmt"
import "core:math"
import "core:math/linalg"
import "core:os"
Vec3 :: linalg.Vector3f32
Mat4 :: linalg.Matrix4x4f32
GL_MAJOR_VERSION :: 3
GL_MINOR_VERSION :: 3
delta_time: f32 = 0.0
last_frame: f32 = 0.0
SCREEN_WIDTH: f32 : 800.0
SCREEN_HEIGTH: f32 : 600.0
camera := camera_init(Vec3{0.0, 0.0, 3.0})
first_mouse := true
last_x: f32 = 800.0 / 2.0
last_y: f32 = 800.0 / 2.0
light_pos := Vec3{1.2, 1.0, 2.0}
framebuffer_size_callback :: proc "cdecl" (window: glfw.WindowHandle, width, height: i32) {
gl.Viewport(0, 0, width, height)
}
mouse_callback :: proc "cdecl" (window: glfw.WindowHandle, xpos_in, ypos_in: f64) {
context = runtime.default_context()
xpos: f32 = f32(xpos_in)
ypos: f32 = f32(ypos_in)
if first_mouse {
last_x = xpos
last_y = ypos
first_mouse = false
}
xoffset: f32 = xpos - last_x
yoffset: f32 = last_y - ypos
last_x = xpos
last_y = ypos
process_mouse_move(camera, xoffset, yoffset)
}
mouse_scroll_callback :: proc "cdecl" (window: glfw.WindowHandle, xoffset, yoffset: f64) {
context = runtime.default_context()
process_mouse_scroll(camera, f32(yoffset))
}
process_input :: proc(window: ^glfw.WindowHandle) {
if glfw.GetKey(window^, glfw.KEY_ESCAPE) == glfw.PRESS {
glfw.SetWindowShouldClose(window^, true)
}
if glfw.GetKey(window^, glfw.KEY_W) == glfw.PRESS {
process_keyboard(camera, CameraMovement.FORWARD, delta_time)
}
if glfw.GetKey(window^, glfw.KEY_S) == glfw.PRESS {
process_keyboard(camera, CameraMovement.BACKWARD, delta_time)
}
if glfw.GetKey(window^, glfw.KEY_A) == glfw.PRESS {
process_keyboard(camera, CameraMovement.LEFT, delta_time)
}
if glfw.GetKey(window^, glfw.KEY_D) == glfw.PRESS {
process_keyboard(camera, CameraMovement.RIGHT, delta_time)
}
}
main :: proc() {
glfw.Init()
glfw.WindowHint(glfw.CONTEXT_VERSION_MAJOR, GL_MAJOR_VERSION)
glfw.WindowHint(glfw.CONTEXT_VERSION_MINOR, GL_MINOR_VERSION)
glfw.WindowHint(glfw.OPENGL_PROFILE, glfw.OPENGL_CORE_PROFILE)
when ODIN_OS == .Darwin {
glfw.WindowHint(glfw.OPENGL_FORWARD_COMPAT, gl.TRUE)
}
window := glfw.CreateWindow(800, 600, "Funhalla Engine", nil, nil)
defer glfw.Terminate()
defer glfw.DestroyWindow(window)
if window == nil {
fmt.eprintln("Failed to create GLFW window")
return
}
glfw.MakeContextCurrent(window)
gl.load_up_to(GL_MAJOR_VERSION, GL_MINOR_VERSION, glfw.gl_set_proc_address)
gl.Viewport(0, 0, 800, 600)
glfw.SetFramebufferSizeCallback(window, framebuffer_size_callback)
glfw.SetCursorPosCallback(window, mouse_callback)
glfw.SetScrollCallback(window, mouse_scroll_callback)
glfw.SetInputMode(window, glfw.CURSOR, glfw.CURSOR_DISABLED)
vbo, light_cube_vao, cube_vao: u32
gl.GenBuffers(1, &vbo)
gl.BindBuffer(gl.ARRAY_BUFFER, vbo)
gl.BufferData(
gl.ARRAY_BUFFER,
size_of(f32) * len(vertices),
raw_data(vertices),
gl.STATIC_DRAW,
)
gl.GenVertexArrays(1, &cube_vao)
gl.BindVertexArray(cube_vao)
gl.VertexAttribPointer(0, 3, gl.FLOAT, gl.FALSE, 8 * size_of(f32), 0)
gl.EnableVertexAttribArray(0)
gl.VertexAttribPointer(1, 3, gl.FLOAT, gl.FALSE, 8 * size_of(f32), 3 * size_of(f32))
gl.EnableVertexAttribArray(1)
gl.VertexAttribPointer(2, 2, gl.FLOAT, gl.FALSE, 8 * size_of(f32), 6 * size_of(f32));
gl.EnableVertexAttribArray(2)
gl.GenVertexArrays(1, &light_cube_vao)
gl.BindVertexArray(light_cube_vao)
gl.BindBuffer(gl.ARRAY_BUFFER, vbo)
gl.VertexAttribPointer(0, 3, gl.FLOAT, gl.FALSE, 8 * size_of(f32), 0)
gl.EnableVertexAttribArray(0)
defer gl.DeleteVertexArrays(1, &light_cube_vao)
defer gl.DeleteVertexArrays(1, &cube_vao)
defer gl.DeleteBuffers(1, &vbo)
diffuse_map := load_texture("res/images/container.png")
specular_map := load_texture("res/images/container_specular.png")
if diffuse_map == 0 {
fmt.eprintln("could not load texture: exiting...")
return
}
light_cube_shader, err := shader_init(
"res/shaders/light_cube.vs",
"res/shaders/light_cube.fs",
)
if err == SHADER_LOAD_ERROR {
fmt.eprintln("Could not initialize shader")
return
}
lighting_shader: ^Shader
lighting_shader, err = shader_init("res/shaders/colors.vs", "res/shaders/colors.fs")
if err == SHADER_LOAD_ERROR {
fmt.eprintln("Could not initialize shader")
return
}
shader_use(lighting_shader)
shader_set_i32(lighting_shader, "material.diffuse", 0)
shader_set_i32(lighting_shader, "material.specular", 1)
//gl.PolygonMode(gl.FRONT_AND_BACK, gl.LINE)
gl.Enable(gl.DEPTH_TEST)
for !glfw.WindowShouldClose(window) {
current_frame: f32 = f32(glfw.GetTime())
delta_time = current_frame - last_frame
last_frame = current_frame
process_input(&window)
gl.ClearColor(0.1, 0.1, 0.1, 1.0)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
shader_use(lighting_shader)
material_ambient := Vec3{1.0, 0.5, 0.31}
material_specular := Vec3{0.5, 0.5, 0.5}
shader_set_vec3(lighting_shader, cstring("material.ambient"), &material_ambient)
shader_set_vec3(lighting_shader, cstring("material.specular"), &material_specular)
shader_set_f32(lighting_shader, cstring("material.shininess"), 32.0)
light_diffuse := Vec3{0.5, 0.5, 0.05}
light_ambient := Vec3{0.2, 0.2, 0.2}
light_specular := Vec3{1.0, 1.0, 1.0}
light_direction := Vec3{-0.2, -1.0, -0.3}
shader_set_vec3(lighting_shader, "light_direction", &light_direction)
shader_set_vec3(lighting_shader, cstring("light.ambient"), &light_ambient)
shader_set_vec3(lighting_shader, cstring("light.diffuse"), &light_diffuse)
shader_set_vec3(lighting_shader, cstring("light.specular"), &light_specular)
shader_set_vec3(lighting_shader, cstring("light_position"), &light_pos)
shader_set_vec3(lighting_shader, cstring("view_position"), &camera.position)
aspect: f32 = 800.0 / 600.0
projection := linalg.matrix4_perspective_f32(
linalg.to_radians(camera.zoom),
aspect,
0.1,
100.0,
)
view := get_view_matrix(camera)
view_location := gl.GetUniformLocation(lighting_shader.id, "view")
gl.UniformMatrix4fv(view_location, 1, gl.FALSE, &view[0][0])
projection_location := gl.GetUniformLocation(lighting_shader.id, "projection")
gl.UniformMatrix4fv(projection_location, 1, gl.FALSE, &projection[0][0])
model := linalg.MATRIX4F32_IDENTITY
shader_set_mat4(lighting_shader, cstring("model"), &model)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, diffuse_map)
gl.ActiveTexture(gl.TEXTURE1)
gl.BindTexture(gl.TEXTURE_2D, specular_map)
gl.BindVertexArray(cube_vao)
// gl.DrawArrays(gl.TRIANGLES, 0, 36)
for position, i in cube_positions {
model = linalg.MATRIX4F32_IDENTITY
model *= linalg.matrix4_translate_f32(position)
angle : f32 = linalg.to_radians(20.0 * f32(i))
model *= linalg.matrix4_rotate_f32(angle, Vec3{1.0, 0.3, 0.5})
shader_set_mat4(lighting_shader, "model", &model)
gl.DrawArrays(gl.TRIANGLES, 0, 36)
}
//// lamp cube object drawing
//shader_use(light_cube_shader)
//shader_set_mat4(light_cube_shader, cstring("projection"), &projection)
//shader_set_mat4(light_cube_shader, cstring("view"), &view)
//
//model = linalg.matrix4_translate_f32(light_pos)
//model *= linalg.matrix4_scale_f32(Vec3{0.2, 0.2, 0.2})
//shader_set_mat4(light_cube_shader, cstring("model"), &model)
//
//gl.BindVertexArray(light_cube_vao)
//gl.DrawArrays(gl.TRIANGLES, 0, 36)
glfw.SwapBuffers(window)
glfw.PollEvents()
}
}
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