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
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
/*******************************************************************************************
*
* raylib [shaders] example - Hybrid Rendering
*
* Example originally created with raylib 4.2, last time updated with raylib 4.2
*
* Example contributed by Buğra Alptekin Sarı (@BugraAlptekinSari) and reviewed by 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) 2022-2024 Buğra Alptekin Sarı (@BugraAlptekinSari)
*
********************************************************************************************/
#include "raylib.h"
#include "rlgl.h"
#include "math.h" // Used for tan()
#include "raymath.h" // Used to calculate camera Direction
#if defined(PLATFORM_DESKTOP)
#define GLSL_VERSION 330
#else // PLATFORM_ANDROID, PLATFORM_WEB
#define GLSL_VERSION 100
#endif
//------------------------------------------------------------------------------------
// Declare custom functions required for the example
//------------------------------------------------------------------------------------
// Load custom render texture, create a writable depth texture buffer
static RenderTexture2D LoadRenderTextureDepthTex(int width, int height);
// Unload render texture from GPU memory (VRAM)
static void UnloadRenderTextureDepthTex(RenderTexture2D target);
//------------------------------------------------------------------------------------
// Declare custom Structs
//------------------------------------------------------------------------------------
typedef struct {
unsigned int camPos, camDir, screenCenter;
}RayLocs ;
//------------------------------------------------------------------------------------
// Program main entry point
//------------------------------------------------------------------------------------
int main(void)
{
// Initialization
//--------------------------------------------------------------------------------------
const int screenWidth = 800;
const int screenHeight = 450;
InitWindow(screenWidth, screenHeight, "raylib [shaders] example - write depth buffer");
// This Shader calculates pixel depth and color using raymarch
Shader shdrRaymarch = LoadShader(0, TextFormat("resources/shaders/glsl%i/hybrid_raymarch.fs", GLSL_VERSION));
// This Shader is a standard rasterization fragment shader with the addition of depth writing
// You are required to write depth for all shaders if one shader does it
Shader shdrRaster = LoadShader(0, TextFormat("resources/shaders/glsl%i/hybrid_raster.fs", GLSL_VERSION));
// Declare Struct used to store camera locs.
RayLocs marchLocs = {0};
// Fill the struct with shader locs.
marchLocs.camPos = GetShaderLocation(shdrRaymarch, "camPos");
marchLocs.camDir = GetShaderLocation(shdrRaymarch, "camDir");
marchLocs.screenCenter = GetShaderLocation(shdrRaymarch, "screenCenter");
// Transfer screenCenter position to shader. Which is used to calculate ray direction.
Vector2 screenCenter = {.x = screenWidth/2.0f, .y = screenHeight/2.0f};
SetShaderValue(shdrRaymarch, marchLocs.screenCenter , &screenCenter , SHADER_UNIFORM_VEC2);
// Use Customized function to create writable depth texture buffer
RenderTexture2D target = LoadRenderTextureDepthTex(screenWidth, screenHeight);
// Define the camera to look into our 3d world
Camera camera = {
.position = (Vector3){ 0.5f, 1.0f, 1.5f }, // Camera position
.target = (Vector3){ 0.0f, 0.5f, 0.0f }, // Camera looking at point
.up = (Vector3){ 0.0f, 1.0f, 0.0f }, // Camera up vector (rotation towards target)
.fovy = 45.0f, // Camera field-of-view Y
.projection = CAMERA_PERSPECTIVE // Camera projection type
};
// Camera FOV is pre-calculated in the camera Distance.
float camDist = 1.0f/(tanf(camera.fovy*0.5f*DEG2RAD));
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 Camera Postion in the ray march shader.
SetShaderValue(shdrRaymarch, marchLocs.camPos, &(camera.position), RL_SHADER_UNIFORM_VEC3);
// Update Camera Looking Vector. Vector length determines FOV.
Vector3 camDir = Vector3Scale( Vector3Normalize( Vector3Subtract(camera.target, camera.position)) , camDist);
SetShaderValue(shdrRaymarch, marchLocs.camDir, &(camDir), RL_SHADER_UNIFORM_VEC3);
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
// Draw into our custom render texture (framebuffer)
BeginTextureMode(target);
ClearBackground(WHITE);
// Raymarch Scene
rlEnableDepthTest(); //Manually enable Depth Test to handle multiple rendering methods.
BeginShaderMode(shdrRaymarch);
DrawRectangleRec((Rectangle){0,0, (float)screenWidth, (float)screenHeight},WHITE);
EndShaderMode();
// Rasterize Scene
BeginMode3D(camera);
BeginShaderMode(shdrRaster);
DrawCubeWiresV((Vector3){ 0.0f, 0.5f, 1.0f }, (Vector3){ 1.0f, 1.0f, 1.0f }, RED);
DrawCubeV((Vector3){ 0.0f, 0.5f, 1.0f }, (Vector3){ 1.0f, 1.0f, 1.0f }, PURPLE);
DrawCubeWiresV((Vector3){ 0.0f, 0.5f, -1.0f }, (Vector3){ 1.0f, 1.0f, 1.0f }, DARKGREEN);
DrawCubeV((Vector3) { 0.0f, 0.5f, -1.0f }, (Vector3){ 1.0f, 1.0f, 1.0f }, YELLOW);
DrawGrid(10, 1.0f);
EndShaderMode();
EndMode3D();
EndTextureMode();
// Draw into screen our custom render texture
BeginDrawing();
ClearBackground(RAYWHITE);
DrawTextureRec(target.texture, (Rectangle) { 0, 0, (float)screenWidth, (float)-screenHeight }, (Vector2) { 0, 0 }, WHITE);
DrawFPS(10, 10);
EndDrawing();
//----------------------------------------------------------------------------------
}
// De-Initialization
//--------------------------------------------------------------------------------------
UnloadRenderTextureDepthTex(target);
UnloadShader(shdrRaymarch);
UnloadShader(shdrRaster);
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}
//------------------------------------------------------------------------------------
// Define custom functions required for the example
//------------------------------------------------------------------------------------
// Load custom render texture, create a writable depth texture buffer
RenderTexture2D LoadRenderTextureDepthTex(int width, int height)
{
RenderTexture2D target = { 0 };
target.id = rlLoadFramebuffer(); // Load an empty framebuffer
if (target.id > 0)
{
rlEnableFramebuffer(target.id);
// Create color texture (default to RGBA)
target.texture.id = rlLoadTexture(0, width, height, PIXELFORMAT_UNCOMPRESSED_R8G8B8A8, 1);
target.texture.width = width;
target.texture.height = height;
target.texture.format = PIXELFORMAT_UNCOMPRESSED_R8G8B8A8;
target.texture.mipmaps = 1;
// Create depth texture buffer (instead of raylib default renderbuffer)
target.depth.id = rlLoadTextureDepth(width, height, false);
target.depth.width = width;
target.depth.height = height;
target.depth.format = 19; //DEPTH_COMPONENT_24BIT?
target.depth.mipmaps = 1;
// Attach color texture and depth texture to FBO
rlFramebufferAttach(target.id, target.texture.id, RL_ATTACHMENT_COLOR_CHANNEL0, RL_ATTACHMENT_TEXTURE2D, 0);
rlFramebufferAttach(target.id, target.depth.id, RL_ATTACHMENT_DEPTH, RL_ATTACHMENT_TEXTURE2D, 0);
// Check if fbo is complete with attachments (valid)
if (rlFramebufferComplete(target.id)) TRACELOG(LOG_INFO, "FBO: [ID %i] Framebuffer object created successfully", target.id);
rlDisableFramebuffer();
}
else TRACELOG(LOG_WARNING, "FBO: Framebuffer object can not be created");
return target;
}
// Unload render texture from GPU memory (VRAM)
void UnloadRenderTextureDepthTex(RenderTexture2D target)
{
if (target.id > 0)
{
// Color texture attached to FBO is deleted
rlUnloadTexture(target.texture.id);
rlUnloadTexture(target.depth.id);
// NOTE: Depth texture is automatically
// queried and deleted before deleting framebuffer
rlUnloadFramebuffer(target.id);
}
}
|
