1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
/*******************************************************************************************
*
* raylib [shaders] example - Mesh instancing
*
* Example originally created with raylib 3.7, last time updated with raylib 4.2
*
* Example contributed by @seanpringle and reviewed by Max (@moliad) and Ramon Santamaria (@raysan5)
*
* Example 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) 2020-2024 @seanpringle, Max (@moliad) and Ramon Santamaria (@raysan5)
*
********************************************************************************************/
#include "raylib.h"
#include "raymath.h"
#define RLIGHTS_IMPLEMENTATION
#include "rlights.h"
#include <stdlib.h> // Required for: calloc(), free()
#if defined(PLATFORM_DESKTOP)
#define GLSL_VERSION 330
#else // PLATFORM_ANDROID, PLATFORM_WEB
#define GLSL_VERSION 100
#endif
#define MAX_INSTANCES 10000
//------------------------------------------------------------------------------------
// Program main entry point
//------------------------------------------------------------------------------------
int main(void)
{
// Initialization
//--------------------------------------------------------------------------------------
const int screenWidth = 800;
const int screenHeight = 450;
InitWindow(screenWidth, screenHeight, "raylib [shaders] example - mesh instancing");
// Define the camera to look into our 3d world
Camera camera = { 0 };
camera.position = (Vector3){ -125.0f, 125.0f, -125.0f }; // Camera position
camera.target = (Vector3){ 0.0f, 0.0f, 0.0f }; // Camera looking at point
camera.up = (Vector3){ 0.0f, 1.0f, 0.0f }; // Camera up vector (rotation towards target)
camera.fovy = 45.0f; // Camera field-of-view Y
camera.projection = CAMERA_PERSPECTIVE; // Camera projection type
// Define mesh to be instanced
Mesh cube = GenMeshCube(1.0f, 1.0f, 1.0f);
// Define transforms to be uploaded to GPU for instances
Matrix *transforms = (Matrix *)RL_CALLOC(MAX_INSTANCES, sizeof(Matrix)); // Pre-multiplied transformations passed to rlgl
// Translate and rotate cubes randomly
for (int i = 0; i < MAX_INSTANCES; i++)
{
Matrix translation = MatrixTranslate((float)GetRandomValue(-50, 50), (float)GetRandomValue(-50, 50), (float)GetRandomValue(-50, 50));
Vector3 axis = Vector3Normalize((Vector3){ (float)GetRandomValue(0, 360), (float)GetRandomValue(0, 360), (float)GetRandomValue(0, 360) });
float angle = (float)GetRandomValue(0, 10)*DEG2RAD;
Matrix rotation = MatrixRotate(axis, angle);
transforms[i] = MatrixMultiply(rotation, translation);
}
// Load lighting shader
Shader shader = LoadShader(TextFormat("resources/shaders/glsl%i/lighting_instancing.vs", GLSL_VERSION),
TextFormat("resources/shaders/glsl%i/lighting.fs", GLSL_VERSION));
// Get shader locations
shader.locs[SHADER_LOC_MATRIX_MVP] = GetShaderLocation(shader, "mvp");
shader.locs[SHADER_LOC_VECTOR_VIEW] = GetShaderLocation(shader, "viewPos");
shader.locs[SHADER_LOC_MATRIX_MODEL] = GetShaderLocationAttrib(shader, "instanceTransform");
// Set shader value: ambient light level
int ambientLoc = GetShaderLocation(shader, "ambient");
SetShaderValue(shader, ambientLoc, (float[4]){ 0.2f, 0.2f, 0.2f, 1.0f }, SHADER_UNIFORM_VEC4);
// Create one light
CreateLight(LIGHT_DIRECTIONAL, (Vector3){ 50.0f, 50.0f, 0.0f }, Vector3Zero(), WHITE, shader);
// NOTE: We are assigning the intancing shader to material.shader
// to be used on mesh drawing with DrawMeshInstanced()
Material matInstances = LoadMaterialDefault();
matInstances.shader = shader;
matInstances.maps[MATERIAL_MAP_DIFFUSE].color = RED;
// Load default material (using raylib intenral default shader) for non-instanced mesh drawing
// WARNING: Default shader enables vertex color attribute BUT GenMeshCube() does not generate vertex colors, so,
// when drawing the color attribute is disabled and a default color value is provided as input for thevertex attribute
Material matDefault = LoadMaterialDefault();
matDefault.maps[MATERIAL_MAP_DIFFUSE].color = BLUE;
SetTargetFPS(60); // Set our game to run at 60 frames-per-second
//--------------------------------------------------------------------------------------
// Main game loop
while (!WindowShouldClose()) // Detect window close button or ESC key
{
// Update
//----------------------------------------------------------------------------------
UpdateCamera(&camera, CAMERA_ORBITAL);
// Update the light shader with the camera view position
float cameraPos[3] = { camera.position.x, camera.position.y, camera.position.z };
SetShaderValue(shader, shader.locs[SHADER_LOC_VECTOR_VIEW], cameraPos, SHADER_UNIFORM_VEC3);
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(RAYWHITE);
BeginMode3D(camera);
// Draw cube mesh with default material (BLUE)
DrawMesh(cube, matDefault, MatrixTranslate(-10.0f, 0.0f, 0.0f));
// Draw meshes instanced using material containing instancing shader (RED + lighting),
// transforms[] for the instances should be provided, they are dynamically
// updated in GPU every frame, so we can animate the different mesh instances
DrawMeshInstanced(cube, matInstances, transforms, MAX_INSTANCES);
// Draw cube mesh with default material (BLUE)
DrawMesh(cube, matDefault, MatrixTranslate(10.0f, 0.0f, 0.0f));
EndMode3D();
DrawFPS(10, 10);
EndDrawing();
//----------------------------------------------------------------------------------
}
// De-Initialization
//--------------------------------------------------------------------------------------
RL_FREE(transforms); // Free transforms
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}
|
