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shadow_mapping_with_dof.c
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// https://github.com/Flix01/Tiny-OpenGL-Shadow-Mapping-Examples
/** License
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
// DEPENDENCIES:
/*
-> glut or freeglut (the latter is recommended)
-> glew (Windows only)
*/
// HOW TO COMPILE:
/*
// LINUX:
gcc -O2 -std=gnu89 -no-pie shadow_mapping_with_dof.c -o shadow_mapping_with_dof -I"../" -lglut -lGL -lX11 -lm
// WINDOWS (here we use the static version of glew, and glut32.lib, that can be replaced by freeglut.lib):
cl /O2 /MT /Tc shadow_mapping_with_dof.c /D"GLEW_STATIC" /I"../" /link /out:shadow_mapping_with_dof.exe glut32.lib glew32s.lib opengl32.lib gdi32.lib Shell32.lib comdlg32.lib user32.lib kernel32.lib
// IN ADDITION:
By default the source file assumes that every OpenGL-related header is in "GL/".
But you can define in the command-line the correct paths you use in your system
for glut.h, glew.h, etc. with something like:
-DGLUT_PATH=\"Glut/glut.h\"
-DGLEW_PATH=\"Glew/glew.h\"
(this syntax works on Linux, don't know about Windows)
*/
//#define USE_GLEW // By default it's only defined for Windows builds (but can be defined in Linux/Mac builds too)
// WHAT THIS DEMO SHOULD DO:
/*
This demo is basically the same as shadow_mapping.c, with the addition of a DEPTH OF FIELD post-processing filter.
When implemented correctly, it should:
1) blur the objects in the background (farther away from the 3D pivot).
2) blur the objects in the foreground (nearer than the 3D pivot).
3) always keep the 3D pivot into focus (= never blur it).
This should work always regardless of camera zooming, camera ortho/projective mode switching, etc.
*/
// IS THERE SOME FASTER IMPLEMENTATION?
/*
For sure! Usually people just use hardware mipmaps (instead of filtering in the shader), and in the
shader they just use textureLod(...) with the desired mipmap level.
*/
#define PROGRAM_NAME "shadow_mapping_with_dof"
#define VISUALIZE_DEPTH_TEXTURE
#define SHADOW_MAP_RESOLUTION 1024 //1024
#define SHADOW_MAP_CLAMP_MODE GL_CLAMP_TO_EDGE // GL_CLAMP or GL_CLAMP_TO_EDGE or GL_CLAMP_TO_BORDER
// GL_CLAMP; // sampling outside of the shadow map gives always shadowed pixels
// GL_CLAMP_TO_EDGE; // sampling outside of the shadow map can give shadowed or unshadowed pixels (it depends on the edge of the shadow map)
// GL_CLAMP_TO_BORDER; // sampling outside of the shadow map gives always non-shadowed pixels (if we set the border color correctly)
#define SHADOW_MAP_FILTER GL_LINEAR // GL_LINEAR or GL_NEAREST (GL_LINEAR is more useful with a sampler2DShadow, that cannot be used with esponential shadow mapping)
//#define USE_UNSTABLE_SHADOW_MAPPING_TECHNIQUE // Better resolution, but shadow-swimming as the camera rotates (on static objects). Please see README.md about it.
// in camera ortho3d mode [F1], the resolution is further better, but shadow-swimming appears when zooming in-out too.
//#define DISABLE_DOF_PASS
// These path definitions can be passed to the compiler command-line
#ifndef GLUT_PATH
# define GLUT_PATH "GL/glut.h" // Mandatory
#endif //GLEW_PATH
#ifndef FREEGLUT_EXT_PATH
# define FREEGLUT_EXT_PATH "GL/freeglut_ext.h" // Optional (used only if glut.h comes from the freeglut library)
#endif //GLEW_PATH
#ifndef GLEW_PATH
# define GLEW_PATH "GL/glew.h" // Mandatory for Windows only
#endif //GLEW_PATH
#ifdef _WIN32
# include "windows.h"
# define USE_GLEW
#endif //_WIN32
#ifdef USE_GLEW
# include GLEW_PATH
#else //USE_GLEW
# define GL_GLEXT_PROTOTYPES
#endif //USE_GLEW
#include GLUT_PATH
#ifdef __FREEGLUT_STD_H__
# include FREEGLUT_EXT_PATH
#endif //__FREEGLUT_STD_H__
#define STR_MACRO(s) #s
#define XSTR_MACRO(s) STR_MACRO(s)
#include "helper_functions.h" // please search this .c file for "Helper_":
// only very few of its functions are used.
#include <stdio.h>
#include <math.h>
#include <string.h>
// Config file handling: basically there's an .ini file next to the
// exe that you can tweak. (it's just an extra)
const char* ConfigFileName = PROGRAM_NAME".ini";
typedef struct {
int fullscreen_width,fullscreen_height;
int windowed_width,windowed_height;
int fullscreen_enabled;
int show_fps;
int use_camera_ortho3d_projection_matrix;
} Config;
void Config_Init(Config* c) {
c->fullscreen_width=c->fullscreen_height=0;
c->windowed_width=960;c->windowed_height=540;
c->fullscreen_enabled=0;
c->show_fps = 0;
c->use_camera_ortho3d_projection_matrix = 0;
}
int Config_Load(Config* c,const char* filePath) {
FILE* f = fopen(filePath, "rt");
char ch='\0';char buf[256]="";
size_t nread=0;
int numParsedItem=0;
if (!f) return -1;
while ((ch = fgetc(f)) !=EOF) {
buf[nread]=ch;
nread++;
if (nread>255) {
nread=0;
continue;
}
if (ch=='\n') {
buf[nread]='\0';
if (nread<2 || buf[0]=='[' || buf[0]=='#') {nread = 0;continue;}
if (nread>2 && buf[0]=='/' && buf[1]=='/') {nread = 0;continue;}
// Parse
switch (numParsedItem) {
case 0:
sscanf(buf, "%d %d", &c->fullscreen_width,&c->fullscreen_height);
break;
case 1:
sscanf(buf, "%d %d", &c->windowed_width,&c->windowed_height);
break;
case 2:
sscanf(buf, "%d", &c->fullscreen_enabled);
break;
case 3:
sscanf(buf, "%d", &c->show_fps);
break;
case 4:
sscanf(buf, "%d", &c->use_camera_ortho3d_projection_matrix);
break;
}
nread=0;
++numParsedItem;
}
}
fclose(f);
if (c->windowed_width<=0) c->windowed_width=720;
if (c->windowed_height<=0) c->windowed_height=405;
return 0;
}
int Config_Save(Config* c,const char* filePath) {
FILE* f = fopen(filePath, "wt");
if (!f) return -1;
fprintf(f, "[Size In Fullscreen Mode (zero means desktop size)]\n%d %d\n",c->fullscreen_width,c->fullscreen_height);
fprintf(f, "[Size In Windowed Mode]\n%d %d\n",c->windowed_width,c->windowed_height);
fprintf(f, "[Fullscreen Enabled (0 or 1) (CTRL+RETURN)]\n%d\n", c->fullscreen_enabled);
fprintf(f, "[Show FPS (0 or 1) (F2)]\n%d\n", c->show_fps);
fprintf(f, "[Use camera ortho3d projection matrix (0 or 1) (F1)]\n%d\n", c->use_camera_ortho3d_projection_matrix);
fprintf(f,"\n");
fclose(f);
return 0;
}
Config config;
// glut has a special fullscreen GameMode that you can toggle with CTRL+RETURN (not in WebGL)
int windowId = 0; // window Id when not in fullscreen mode
int gameModeWindowId = 0; // window Id when in fullscreen mode
// Now we can start with our program
// camera data:
float targetPos[3]; // please set it in resetCamera()
float cameraYaw; // please set it in resetCamera()
float cameraPitch; // please set it in resetCamera()
float cameraDistance; // please set it in resetCamera()
float cameraPos[3]; // Derived value (do not edit)
float vMatrix[16]; // view matrix
float cameraSpeed = 0.5f; // When moving it
// light data
float lightYaw = M_PI*0.425f,lightPitch = M_PI*0.235f; // must be copied to resetLight() too
float lightDirection[4] = {0,1,0,0}; // Derived value (do not edit) [lightDirection[3]==0]
// pMatrix data:
float pMatrix[16],pMatrixInverse[16]; // projection matrix (pMatrixInverse is used only when USE_UNSTABLE_SHADOW_MAPPING_TECHNIQUE is defined)
const float pMatrixFovyDeg = 45.f; // smaller => better shadow resolution
const float pMatrixNearPlane = 0.5f; // bigger => better shadow resolution
const float pMatrixFarPlane = 20.f; // smaller => better shadow resolution
float instantFrameTime = 16.2f;
// Optional (to speed up Helper_GlutDrawGeometry(...) a bit)
GLuint gDisplayListBase = 0;GLuint* pgDisplayListBase = &gDisplayListBase; // Can be set to 0 as a fallback.
float current_width=0,current_height=0,current_aspect_ratio=1; // Not sure when I've used these...
static const char* ShadowPassVertexShader[] = {
" void main() {\n"
" gl_Position = ftransform();\n"
" }\n"
};
static const char* ShadowPassFragmentShader[] = {
" void main() {\n"
" //gl_FragColor = gl_Color;\n"
" }\n"
};
typedef struct {
GLuint fbo;
GLuint textureId;
GLuint program;
} ShadowPass;
ShadowPass shadowPass;
void InitShadowPass(ShadowPass* sp) {
sp->program = Helper_LoadShaderProgramFromSource(*ShadowPassVertexShader,*ShadowPassFragmentShader);
// create depth texture
glGenTextures(1, &sp->textureId);
glBindTexture(GL_TEXTURE_2D, sp->textureId);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, SHADOW_MAP_FILTER);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, SHADOW_MAP_FILTER);
# ifndef __EMSCRIPTEN__
glTexImage2D( GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, SHADOW_MAP_RESOLUTION, SHADOW_MAP_RESOLUTION, 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, 0);
# else //__EMSCRIPTEN__
glTexImage2D( GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, SHADOW_MAP_RESOLUTION, SHADOW_MAP_RESOLUTION, 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_SHORT, 0);
# undef SHADOW_MAP_CLAMP_MODE
# define SHADOW_MAP_CLAMP_MODE GL_CLAMP_TO_EDGE
# endif //__EMSCRIPTEN__
if (SHADOW_MAP_CLAMP_MODE==GL_CLAMP_TO_BORDER) {
const GLfloat border[] = {1.0f,1.0f,1.0f,0.0f };
glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_BORDER_COLOR, border);
}
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, SHADOW_MAP_CLAMP_MODE );
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, SHADOW_MAP_CLAMP_MODE );
glBindTexture(GL_TEXTURE_2D, 0);
// create depth fbo
glGenFramebuffers(1, &sp->fbo);
glBindFramebuffer(GL_FRAMEBUFFER, sp->fbo);
# ifndef __EMSCRIPTEN__
glDrawBuffer(GL_NONE); // Instruct openGL that we won't bind a color texture with the currently bound FBO
glReadBuffer(GL_NONE);
# endif //__EMSCRIPTEN__
glFramebufferTexture2D(GL_FRAMEBUFFER,GL_DEPTH_ATTACHMENT,GL_TEXTURE_2D,sp->textureId, 0);
{
//Does the GPU support current FBO configuration?
GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
if (status!=GL_FRAMEBUFFER_COMPLETE) printf("glCheckFramebufferStatus(...) FAILED for shadowPass.fbo.\n");
}
glBindFramebuffer(GL_FRAMEBUFFER, 0);
}
void DestroyShadowPass(ShadowPass* sp) {
if (sp->program) {glDeleteProgram(sp->program);sp->program=0;}
if (sp->fbo) {glDeleteBuffers(1,&sp->fbo);sp->fbo=0;}
if (sp->textureId) {glDeleteTextures(1,&sp->textureId);}
}
static const char* DefaultPassVertexShader[] = {
"uniform mat4 u_biasedShadowMvpMatrix;\n" // (*) Actually it's already multiplied with vMatrixInverse (in C code, so that the multiplication can be easily done with doubles)
"varying vec4 v_shadowCoord;\n"
"varying vec4 v_diffuse;\n"
"\n"
"void main() {\n"
" gl_Position = ftransform();\n"
"\n"
" vec3 normal = gl_NormalMatrix * gl_Normal;\n"
" vec3 lightVector = gl_LightSource[0].position.xyz\n;// - gl_Vertex.xyz;\n"
" float nxDir = max(0.0, dot(normal, lightVector));\n"
" v_diffuse = gl_LightSource[0].diffuse * nxDir; \n"
"\n"
" gl_FrontColor = gl_Color;\n"
"\n"
" v_shadowCoord = u_biasedShadowMvpMatrix*(gl_ModelViewMatrix*gl_Vertex);\n" // (*) We don't pass a 'naked' mMatrix in shaders (not robust to double precision usage). We dress it in a mvMatrix. So here we're passing a mMatrix from camera space to light space (through a mvMatrix).
"}\n" // (the bias just converts clip space to texture space)
};
static const char* DefaultPassFragmentShader[] = {
"uniform sampler2D u_shadowMap;\n"
"uniform vec2 u_shadowDarkening;\n" // .x = fDarkeningFactor [10.0-80.0], .y = min value clamp [0.0-1.0]
"varying vec4 v_shadowCoord;\n"
"varying vec4 v_diffuse;\n"
"\n"
"void main() {\n"
" float shadowFactor = 1.0;\n"
" vec4 shadowCoordinateWdivide = v_shadowCoord/v_shadowCoord.w;\n"
" shadowFactor = clamp(exp(u_shadowDarkening.x*(texture2D(u_shadowMap,(shadowCoordinateWdivide.st)).r - shadowCoordinateWdivide.z)),u_shadowDarkening.y,1.0);\n"
"// shadowFactor = clamp( exp(u_shadowDarkening.x*texture2D(u_shadowMap,(shadowCoordinateWdivide.st)).r) * exp(-u_shadowDarkening.x*shadowCoordinateWdivide.z),u_shadowDarkening.y,1.0);\n"
" gl_FragColor = gl_LightSource[0].ambient + (v_diffuse * vec4(gl_Color.rgb*shadowFactor,1.0));\n"
"}\n"
};
typedef struct {
GLuint program;
GLint uniform_location_biasedShadowMvpMatrix;
GLint uniform_location_shadowMap;
GLint uniform_location_shadowDarkening;
} DefaultPass;
DefaultPass defaultPass;
void InitDefaultPass(DefaultPass* dp) {
dp->program = Helper_LoadShaderProgramFromSource(*DefaultPassVertexShader,*DefaultPassFragmentShader);
dp->uniform_location_biasedShadowMvpMatrix = glGetUniformLocation(dp->program,"u_biasedShadowMvpMatrix");
dp->uniform_location_shadowMap = glGetUniformLocation(dp->program,"u_shadowMap");
dp->uniform_location_shadowDarkening = glGetUniformLocation(dp->program,"u_shadowDarkening");
glUseProgram(dp->program);
glUniform1i(dp->uniform_location_shadowMap,0);
glUniform2f(dp->uniform_location_shadowDarkening,80.0,0.45); // Default values are (40.0f,0.75f) in [0-80] and [0-1]
//glUniformMatrix4fv(dp->uniform_location_biasedShadowMvpMatrix, 1 /*only setting 1 matrix*/, GL_FALSE /*transpose?*/, Matrix);
glUseProgram(0);
}
void DestroyDefaultPass(DefaultPass* dp) {
if (dp->program) {glDeleteProgram(dp->program);dp->program=0;}
}
// Mostly adapted from the Github repository: https://github.com/Jam3/glsl-fast-gaussian-blur/ (MIT license)
static const char* DofPassVertexShader[] = {
"#version 120\n"
"varying vec2 v_uv;\n"
"\n"
"void main() {\n"
" gl_Position = gl_Vertex;\n"
" v_uv = gl_MultiTexCoord0.xy;\n"
"}\n"
};
static const char* DofPassFragmentShader[] = {
"#version 120\n"
"uniform vec2 u_resolution;\n" // Maybe using the C macro would be faser
"uniform sampler2D u_sampler;\n"
"uniform sampler2D u_depthSampler;\n"
"uniform vec2 u_direction;\n"
"uniform float u_focusDepthValue;\n"
"uniform vec3 u_dofBlurClampAndBias;\n"
"uniform vec4 u_linearizeDepthConstants;\n" // Perspective: .x = n; .y = f; .z = f-n; .w = 0; Ortho: .x = 0; .w = 1
"\n"
"varying vec2 v_uv;\n"
"\n"
"// It must be: 2.0*weights[].x+2.0*weights[].y+1.0*weights[].z = 1.0; \n"
"const vec3 weights[6] = vec3[6](vec3(0.0, 0.0, 1.0),vec3(0.0, 0.15, 0.7),vec3(0.15, 0.2, 0.3),vec3(0.2, 0.2, 0.2),vec3(0.25, 0.15, 0.2),vec3(0.3, 0.15, 0.1));\n"
"\n"
" vec3 blur(sampler2D image,vec2 uv,vec2 resolution,vec2 direction,float floorBlurSpread,float floorWeightSpread) {\n"
" vec2 off = (direction/resolution)*floorBlurSpread;\n"
" vec3 weight = weights[int(min(floorWeightSpread,5.0))];\n"
" vec3 color= weight.x*(texture2D(image, uv+vec2(-2.0*off.x,-2.0*off.y)).rgb+texture2D(image, uv+vec2(2.0*off.x,2.0*off.y)).rgb) + \n"
" weight.y*(texture2D(image, uv+vec2(-1.0*off.x,-1.0*off.y)).rgb+texture2D(image, uv+vec2(1.0*off.x,1.0*off.y)).rgb) + \n"
" weight.z*texture2D(image, uv).rgb;\n"
" return color;\n"
" }\n"
"\n"
"// For perspective camera only, otherwise it just returns depth (assuming the correct uniforms are set):\n"
"// Maps values in [0,1] to [0,1] range.\n"
"// f>0 and n>0. f>n.\n"
"float LinearizeDepth(float depth) {\n"
" return u_linearizeDepthConstants.w*depth + u_linearizeDepthConstants.x*depth/(u_linearizeDepthConstants.y-u_linearizeDepthConstants.z*depth);\n"
"}\n"
"\n"
"void main() {\n"
" float depth = LinearizeDepth(texture2D(u_depthSampler, v_uv).r);\n" // texture2D(u_depthSampler, v_uv).r is in [0,1]
" float depthDifference = depth - u_focusDepthValue;\n" // u_focusDepthValue has been pre-linearized
" float depthDifferenceSign = sign(depthDifference);\n" // Used below to boost blur in perspective-camera foreground objects only (not needed in ortho mode)
" depthDifference = depthDifference*depthDifferenceSign;\n" // == abs(depthDifference) [depthDifferenceSign<0 for foreground objects only]
" float foregroundObjectsBlurBoost = u_linearizeDepthConstants.w+(1.0-u_linearizeDepthConstants.w)*(2.0-1.0*depthDifferenceSign);\n" // Last added can be boosted this way: (4.0-3.0*depthDifferenceSign) [The difference must be 1.0 regardless of depthDifferenceSign]
" float blurAmount = max(depthDifference - u_dofBlurClampAndBias.y, 0.0);\n" // The intent is to leave a DeltaZ around u_focusDepthValue (based on u_dofBlurClampAndBias.y), with no blur at all.
" blurAmount = min(blurAmount*foregroundObjectsBlurBoost*u_dofBlurClampAndBias.z,u_dofBlurClampAndBias.x);\n" // u_dofBlurClampAndBias.z is the blur power, and u_dofBlurClampAndBias.x is the blur maximum value
" blurAmount = floor(blurAmount);\n"
" gl_FragColor = vec4(blur(u_sampler,v_uv,u_resolution.xy,u_direction,blurAmount,blurAmount),1.0);\n" // Here we reuse blurAmount twice (for both blur radius and (weight) power), but maybe there's a better way to set these values
"\n"
" //gl_FragColor = vec4(depth,depth,depth,1);\n" // This looks OK for both perspective and ortho AFAICS (so that LinearizeDepth(...) seems to be correct)
"}\n"
};
typedef struct {
GLuint program; // program that, on a fullscreen quad, applies vertical OR horizontal dof
GLuint depthTextureId;
GLuint colorTextureId1,colorTextureId2;
GLuint fbo1,fbo2; // fbo1 draws to colorTextureId1 and depthTextureId;fbo2 draws to colorTextureId2
GLint uniform_location_resolution;
GLint uniform_location_sampler;
GLint uniform_location_depthSampler;
GLint uniform_location_direction;
GLint uniform_location_dofBlurClampAndBias;
GLint uniform_location_focusDepthValue;
GLint uniform_location_linearizeDepthConstants;
} DofPass;
DofPass dofPass;
void InitDofPass(DofPass* sp,int width,int height,int skip_creating_program) {
const GLenum imageTextureFIlter =
GL_NEAREST;
//GL_LINEAR;
if (!skip_creating_program) {
sp->program = Helper_LoadShaderProgramFromSource(*DofPassVertexShader,*DofPassFragmentShader);
sp->uniform_location_resolution = glGetUniformLocation(sp->program,"u_resolution");
sp->uniform_location_sampler = glGetUniformLocation(sp->program,"u_sampler");
sp->uniform_location_depthSampler = glGetUniformLocation(sp->program,"u_depthSampler");
sp->uniform_location_direction = glGetUniformLocation(sp->program,"u_direction");
sp->uniform_location_dofBlurClampAndBias = glGetUniformLocation(sp->program,"u_dofBlurClampAndBias");
sp->uniform_location_focusDepthValue = glGetUniformLocation(sp->program,"u_focusDepthValue");
sp->uniform_location_linearizeDepthConstants = glGetUniformLocation(sp->program,"u_linearizeDepthConstants");
glUseProgram(sp->program);
glUniform1i(sp->uniform_location_sampler,0);
glUniform1i(sp->uniform_location_depthSampler,1);
glUniform2f(sp->uniform_location_resolution,width,height);
glUniform2f(sp->uniform_location_direction,1.0f,0.0f);
glUniform3f(sp->uniform_location_dofBlurClampAndBias,2.5f,0.05f,9.f); // .y in (0,1)... but these values are too difficult to tweak
glUniform1f(sp->uniform_location_focusDepthValue,0.5f);
if (config.use_camera_ortho3d_projection_matrix)
glUniform4f(sp->uniform_location_linearizeDepthConstants,0.f,pMatrixFarPlane,pMatrixFarPlane-pMatrixNearPlane,1.f);
else
glUniform4f(sp->uniform_location_linearizeDepthConstants,pMatrixNearPlane,pMatrixFarPlane,pMatrixFarPlane-pMatrixNearPlane,0.f);
glUseProgram(0);
}
// create depthTextureId
glGenTextures(1, &sp->depthTextureId);
glBindTexture(GL_TEXTURE_2D, sp->depthTextureId);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
# ifndef __EMSCRIPTEN__
glTexImage2D( GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, width, height, 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, 0);
# else //__EMSCRIPTEN__
glTexImage2D( GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, width, height, 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_SHORT, 0);
# endif //__EMSCRIPTEN__
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
glBindTexture(GL_TEXTURE_2D, 0);
// create colorTextureId1
glGenTextures(1, &sp->colorTextureId1);
glBindTexture(GL_TEXTURE_2D, sp->colorTextureId1);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, imageTextureFIlter);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, imageTextureFIlter);
glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_FLOAT, 0);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
glBindTexture(GL_TEXTURE_2D, 0);
// create colorTextureId2
glGenTextures(1, &sp->colorTextureId2);
glBindTexture(GL_TEXTURE_2D, sp->colorTextureId2);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, imageTextureFIlter);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, imageTextureFIlter);
glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_FLOAT, 0);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
glBindTexture(GL_TEXTURE_2D, 0);
// create depth fbo1
glGenFramebuffers(1, &sp->fbo1);
glBindFramebuffer(GL_FRAMEBUFFER, sp->fbo1);
# ifndef __EMSCRIPTEN__
//glDrawBuffer(GL_NONE); // Instruct openGL that we won't bind a color texture with the currently bound FBO
//glReadBuffer(GL_NONE); // Maybe this line can be activated
# endif //__EMSCRIPTEN__
glFramebufferTexture2D(GL_FRAMEBUFFER,GL_COLOR_ATTACHMENT0,GL_TEXTURE_2D, sp->colorTextureId1, 0);
glFramebufferTexture2D(GL_FRAMEBUFFER,GL_DEPTH_ATTACHMENT,GL_TEXTURE_2D,sp->depthTextureId, 0);
{
//Does the GPU support current FBO configuration?
GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
if (status!=GL_FRAMEBUFFER_COMPLETE) printf("glCheckFramebufferStatus(...) FAILED for DofPass.fbo1.\n");
}
glBindFramebuffer(GL_FRAMEBUFFER, 0);
// create depth fbo2
glGenFramebuffers(1, &sp->fbo2);
glBindFramebuffer(GL_FRAMEBUFFER, sp->fbo2);
# ifndef __EMSCRIPTEN__
//glDrawBuffer(GL_NONE); // Instruct openGL that we won't bind a color texture with the currently bound FBO
//glReadBuffer(GL_NONE); // Maybe this line can be activated
# endif //__EMSCRIPTEN__
glFramebufferTexture2D(GL_FRAMEBUFFER,GL_COLOR_ATTACHMENT0,GL_TEXTURE_2D, sp->colorTextureId2, 0);
{
//Does the GPU support current FBO configuration?
GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
if (status!=GL_FRAMEBUFFER_COMPLETE) printf("glCheckFramebufferStatus(...) FAILED for DofPass.fbo2.\n");
}
glBindFramebuffer(GL_FRAMEBUFFER, 0);
}
void DestroyDofPass(DofPass* dp,int skip_destroying_program) {
if (!skip_destroying_program && dp->program) {glDeleteProgram(dp->program);dp->program=0;}
if (dp->fbo1) {glDeleteBuffers(1,&dp->fbo1);dp->fbo1=0;}
if (dp->fbo2) {glDeleteBuffers(1,&dp->fbo2);dp->fbo2=0;}
if (dp->colorTextureId1) {glDeleteTextures(1,&dp->colorTextureId1);dp->colorTextureId1=0;}
if (dp->colorTextureId2) {glDeleteTextures(2,&dp->colorTextureId2);dp->colorTextureId2=0;}
if (dp->depthTextureId) {glDeleteTextures(1,&dp->depthTextureId);dp->depthTextureId=0;}
}
void ResizeDofPass(DofPass* dp,int width,int height) {
DestroyDofPass(dp,1);
InitDofPass(dp,width,height,1);
}
void ResizeGL(int w,int h) {
current_width = (float) w;
current_height = (float) h;
if (current_height!=0) current_aspect_ratio = current_width/current_height;
if (h>0) {
// We set our pMatrix
if (!config.use_camera_ortho3d_projection_matrix)
Helper_Perspective(pMatrix,pMatrixFovyDeg,(float)w/(float)h,pMatrixNearPlane,pMatrixFarPlane);
else
Helper_Ortho3D(pMatrix,cameraDistance,pMatrixFovyDeg,(float)w/(float)h,pMatrixNearPlane,pMatrixFarPlane);
glMatrixMode(GL_PROJECTION);glLoadMatrixf(pMatrix);glMatrixMode(GL_MODELVIEW);
# ifdef USE_UNSTABLE_SHADOW_MAPPING_TECHNIQUE
Helper_InvertMatrix(pMatrixInverse,pMatrix); // pMatrixInverse is used only when USE_UNSTABLE_SHADOW_MAPPING_TECHNIQUE is defined
# endif //USE_UNSTABLE_SHADOW_MAPPING_TECHNIQUE
ResizeDofPass(&dofPass,w,h); // new
//# define TESTS_TO_REMOVE
# ifdef TESTS_TO_REMOVE
{
float cameraDist;
if (!config.use_camera_ortho3d_projection_matrix) {
printf("Perspective Camera Tests:\n");
for (cameraDist = pMatrixNearPlane;cameraDist<=pMatrixFarPlane+0.001;cameraDist+=0.5f) {
const float cameraDistanceDepthValue = Helper_Perspective_ZToDepthValue(pMatrix,cameraDist);
const float cameraDistanceEyeZ = Helper_Perspective_DepthValueToZ(pMatrix,cameraDistanceDepthValue);
const float cameraDistanceDepthValueLinearized = Helper_Perspective_LinearizeDepth(cameraDistanceDepthValue,pMatrixNearPlane,pMatrixFarPlane);
const float cameraDistanceDepthValue2 = Helper_Perspective_DelinearizeDepth(cameraDistanceDepthValueLinearized,pMatrixNearPlane,pMatrixFarPlane);
if (fabs(cameraDistanceDepthValue-cameraDistanceDepthValue2)>0.0001f || cameraDistanceEyeZ<pMatrixNearPlane || cameraDistanceEyeZ>pMatrixFarPlane ||
cameraDistanceDepthValue<0 || cameraDistanceDepthValue>1 || cameraDistanceDepthValueLinearized<0 || cameraDistanceDepthValueLinearized>1)
printf("cameraDistance=%1.6f cameraDistanceDepthValue=%1.6f cameraDistanceEyeZ=%1.6f cameraDistanceDepthValueLinearized=%1.6f cameraDistanceDepthValue2=%1.6f\n",
cameraDist,cameraDistanceDepthValue,cameraDistanceEyeZ,cameraDistanceDepthValueLinearized,cameraDistanceDepthValue2);
}
printf("Perspective Camera Tests: DONE\n");
}
else {
printf("Ortho Camera Test:\n");
for (cameraDist = pMatrixNearPlane;cameraDist<=pMatrixFarPlane+0.001;cameraDist+=0.5f) {
Helper_Ortho3D(pMatrix,cameraDist,pMatrixFovyDeg,(float)w/(float)h,pMatrixNearPlane,pMatrixFarPlane);
{
const float cameraDistanceDepthValue = Helper_Ortho_ZToDepthValue(pMatrix,cameraDist);
const float cameraDistanceEyeZ = Helper_Ortho_DepthValueToZ(pMatrix,cameraDistanceDepthValue);
if (fabs(cameraDist-cameraDistanceEyeZ)>0.0001f || cameraDistanceEyeZ<pMatrixNearPlane || cameraDistanceEyeZ>pMatrixFarPlane ||
cameraDistanceDepthValue<0 || cameraDistanceDepthValue>1)
printf("cameraDistance=%1.6f cameraDistanceDepthValue=%1.6f cameraDistanceEyeZ=%1.6f\n",
cameraDist,cameraDistanceDepthValue,cameraDistanceEyeZ);
}
}
printf("Ortho Camera Test: DONE\n");
}
exit(1);
}
# endif
}
if (w>0 && h>0 && !config.fullscreen_enabled) {
// On exiting we'll like to save these data back
config.windowed_width=w;
config.windowed_height=h;
}
glViewport(0,0,w,h); // This is what people often call in ResizeGL()
}
void InitGL(void) {
// These are important, but often overlooked OpenGL calls
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); // Otherwise transparent objects are not displayed correctly
glClearColor(0.3f, 0.6f, 1.0f, 1.0f);
glEnable(GL_TEXTURE_2D); // Only needed for ffp, when VISUALIZE_DEPTH_TEXTURE is defined
// ffp stuff
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glEnable(GL_COLOR_MATERIAL);
glEnable(GL_NORMALIZE);
// New
InitShadowPass(&shadowPass);
InitDefaultPass(&defaultPass);
InitDofPass(&dofPass,current_width,current_height,0);
// Please note that after InitGL(), this implementation calls ResizeGL(...,...).
// If you copy/paste this code you can call it explicitly...
}
void DestroyGL() {
// New
DestroyShadowPass(&shadowPass);
DestroyDefaultPass(&defaultPass);
DestroyDofPass(&dofPass,0);
// 40 display lists are generated by Helper_GlutDrawGeometry(...) if pgDisplayListBase!=0
if (pgDisplayListBase && *pgDisplayListBase) {glDeleteLists(*pgDisplayListBase,40);*pgDisplayListBase=0;}
}
void DrawGL(void)
{
// All the things about time are just used to display FPS (F2)
// or to move objects around (NOT for shadow)
static unsigned begin = 0;
static unsigned cur_time = 0;
unsigned elapsed_time,delta_time;
float elapsedMs;float cosAlpha,sinAlpha; // used to move objects around
// These two instead are necessary for shadow mapping
static float vMatrixInverse[16]; // view Matrix inverse (it's the camera matrix).
static float lvpMatrix[16]; // = light_pMatrix*light_vMatrix
// Just some time stuff here
if (begin==0) begin = glutGet(GLUT_ELAPSED_TIME);
elapsed_time = glutGet(GLUT_ELAPSED_TIME) - begin;
delta_time = elapsed_time - cur_time;
instantFrameTime = (float)delta_time*0.001f;
cur_time = elapsed_time;
elapsedMs = (float)elapsed_time;
cosAlpha = cos(elapsedMs*0.0005f);
sinAlpha = sin(elapsedMs*0.00075f);
// view Matrix
Helper_LookAt(vMatrix,cameraPos[0],cameraPos[1],cameraPos[2],targetPos[0],targetPos[1],targetPos[2],0,1,0);
glLoadMatrixf(vMatrix);
glLightfv(GL_LIGHT0,GL_POSITION,lightDirection); // Important: the ffp must recalculate internally lightDirectionEyeSpace based on vMatrix [=> every frame]
// view Matrix inverse (it's the camera matrix). Used twice below (and very important to keep in any case).
Helper_InvertMatrixFast(vMatrixInverse,vMatrix); // We can use Helper_InvertMatrixFast(...) instead of Helper_InvertMatrix(...) here [No scaling inside and no projection matrix]
// Draw to Shadow Map------------------------------------------------------------------------------------------
{
# ifndef USE_UNSTABLE_SHADOW_MAPPING_TECHNIQUE
Helper_GetLightViewProjectionMatrix(lvpMatrix,
vMatrixInverse,pMatrixNearPlane,pMatrixFarPlane,pMatrixFovyDeg,current_aspect_ratio,
lightDirection,1.0f/(float)SHADOW_MAP_RESOLUTION);
# else //USE_UNSTABLE_SHADOW_MAPPING_TECHNIQUE
Helper_GetLightViewProjectionMatrixExtra(0,
vMatrixInverse,pMatrixNearPlane,pMatrixFarPlane,pMatrixFovyDeg,current_aspect_ratio,config.use_camera_ortho3d_projection_matrix?cameraDistance:0, // in camera ortho3d mode, we can still pass zero as last arg here to avoid shadow-flickering when zooming in-out, at the expense of the further boost in shadow resolution that ortho mode can give us
lightDirection,1.0f/(float)SHADOW_MAP_RESOLUTION,
0,0,
pMatrixInverse, // Mandatory when we need to retrieve arguments that follow it
0,0,
lvpMatrix); // Technically this was provided as an 'lvpMatrix for optimal frustum culling usage' in the 'Stable Shadow Mapping' case (but can be used to replace it too)
# endif //USE_UNSTABLE_SHADOW_MAPPING_TECHNIQUE
// Draw to shadow map texture
glMatrixMode(GL_PROJECTION);glPushMatrix();glLoadIdentity();glMatrixMode(GL_MODELVIEW); // We'll set the combined light view-projection matrix in GL_MODELVIEW (do you know that it's the same?)
glBindFramebuffer(GL_FRAMEBUFFER, shadowPass.fbo);
glViewport(0, 0, SHADOW_MAP_RESOLUTION,SHADOW_MAP_RESOLUTION);
glClear(GL_DEPTH_BUFFER_BIT);
glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
glCullFace(GL_FRONT);
glEnable(GL_DEPTH_CLAMP);
glUseProgram(shadowPass.program); // we can just use glUseProgram(0) here
glPushMatrix();glLoadMatrixf(lvpMatrix); // we load both (light) projection and view matrices here (it's the same after all)
Helper_GlutDrawGeometry(elapsedMs,cosAlpha,sinAlpha,targetPos,pgDisplayListBase); // Done SHADOW_MAP_NUM_CASCADES times!
glPopMatrix();
glUseProgram(0);
glDisable(GL_DEPTH_CLAMP);
glCullFace(GL_BACK);
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
glBindFramebuffer(GL_FRAMEBUFFER,0);
glMatrixMode(GL_PROJECTION);glPopMatrix();glMatrixMode(GL_MODELVIEW);
}
// Draw to dofPass.colortextureId1
{
// biasedShadowMvpMatrix is used only in the DefaultPass:
static float bias[16] = {0.5,0,0,0, 0,0.5,0,0, 0,0,0.5,0, 0.5,0.5,0.5,1}; // Moving from unit cube in NDC [-1,1][-1,1][-1,1] to [0,1][0,1][0,1] (x and y are texCoords; z is the depth range, [0,1] by default in window coordinates)
static float biasedShadowMvpMatrix[16]; // multiplied per vMatrixInverse
Helper_MultMatrix(biasedShadowMvpMatrix,bias,lvpMatrix);
Helper_MultMatrix(biasedShadowMvpMatrix,biasedShadowMvpMatrix,vMatrixInverse); // We do this, so that when in the vertex shader we multiply it with the camera mvMatrix, we get: biasedShadowMvpMatrix * mMatrix (using mMatrices directly in the shaders prevents the usage of double precision matrices: mvMatrices are good when converted to float to feed the shader, mMatrices are bad)
// Draw to dofPass.colortextureId1
# ifndef DISABLE_DOF_PASS
glBindFramebuffer(GL_FRAMEBUFFER, dofPass.fbo1);
# endif //DISABLE_DOF_PASS
glViewport(0, 0, current_width,current_height);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glBindTexture(GL_TEXTURE_2D,shadowPass.textureId);
glUseProgram(defaultPass.program);
glUniformMatrix4fv(defaultPass.uniform_location_biasedShadowMvpMatrix, 1 /*only setting 1 matrix*/, GL_FALSE /*transpose?*/,biasedShadowMvpMatrix);
Helper_GlutDrawGeometry(elapsedMs,cosAlpha,sinAlpha,targetPos,pgDisplayListBase); // Done SHADOW_MAP_NUM_CASCADES times!
glUseProgram(0);
glBindTexture(GL_TEXTURE_2D,0);
glBindFramebuffer(GL_FRAMEBUFFER,0);
}
# ifndef DISABLE_DOF_PASS
// Copy dofPass.textureId to frame buffer
{
int i;
// Not sure at all if this is correct:
const float focusDepthValue =
(config.use_camera_ortho3d_projection_matrix) ?
Helper_Ortho_ZToDepthValue(pMatrix,cameraDistance) :
Helper_Perspective_LinearizeDepth(Helper_Perspective_ZToDepthValue(pMatrix,cameraDistance),pMatrixNearPlane,pMatrixFarPlane)
;
glMatrixMode(GL_PROJECTION);glPushMatrix();glLoadIdentity();
glMatrixMode(GL_MODELVIEW);glPushMatrix();glLoadIdentity();
glDisable(GL_DEPTH_TEST);glDepthMask(GL_FALSE);glDisable(GL_CULL_FACE);glDisable(GL_LIGHTING);
glViewport(0, 0, current_width,current_height);
//glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
// Two passes: horizontal + vertical are faster
for (i=0;i<2;i++) {
const GLuint FBOs[2] = {dofPass.fbo2,0}; // Target texture
const GLuint TEXTs[2] = {dofPass.colorTextureId1,dofPass.colorTextureId2}; // Source texture
glBindFramebuffer(GL_FRAMEBUFFER, FBOs[i]);
glUseProgram(dofPass.program);
glUniform2f(dofPass.uniform_location_resolution,current_width,current_height);
glUniform1f(dofPass.uniform_location_focusDepthValue,focusDepthValue);
if (config.use_camera_ortho3d_projection_matrix)
glUniform4f(dofPass.uniform_location_linearizeDepthConstants,0.f,pMatrixFarPlane,pMatrixFarPlane-pMatrixNearPlane,1.f);
else
glUniform4f(dofPass.uniform_location_linearizeDepthConstants,pMatrixNearPlane,pMatrixFarPlane,pMatrixFarPlane-pMatrixNearPlane,0.f);
glClear(GL_COLOR_BUFFER_BIT);
glBindTexture(GL_TEXTURE_2D,TEXTs[i]);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D,dofPass.depthTextureId);
glActiveTexture(GL_TEXTURE0);
if (i==0) glUniform2f(dofPass.uniform_location_direction,1.0f,0.0f); // Horizontal
else glUniform2f(dofPass.uniform_location_direction,0.0f,1.0f); // Vertical
glColor3f(1,1,1);
glBegin(GL_QUADS);
glTexCoord2f(0,0);glVertex2f(-1, -1);
glTexCoord2f(1,0);glVertex2f( 1, -1);
glTexCoord2f(1,1);glVertex2f( 1, 1);
glTexCoord2f(0,1);glVertex2f(-1, 1);
glEnd();
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D,0);
glActiveTexture(GL_TEXTURE0);
}
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glUseProgram(0);
glBindTexture(GL_TEXTURE_2D,0);
glEnable(GL_DEPTH_TEST);glDepthMask(GL_TRUE);glEnable(GL_CULL_FACE);glEnable(GL_LIGHTING);
glMatrixMode(GL_PROJECTION);glPopMatrix();
glMatrixMode(GL_MODELVIEW);glPopMatrix();
}
# endif //DISABLE_DOF_PASS
if (config.show_fps && instantFrameTime>0) {
if ((elapsed_time/1000)%2==0) {
printf("FPS=%1.0f\n",1.f/instantFrameTime);fflush(stdout);
config.show_fps=0;
}
}
# ifdef VISUALIZE_DEPTH_TEXTURE
{
glDisable(GL_DEPTH_TEST);
glDisable(GL_CULL_FACE);
glDepthMask(GL_FALSE);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
glColor3f(1,1,1);
glDisable(GL_LIGHTING);
glEnable(GL_BLEND);
glBindTexture(GL_TEXTURE_2D,shadowPass.textureId);
glColor4f(1,1,1,0.9f);
glBegin(GL_QUADS);
glTexCoord2f(0,0);glVertex2f(-1, -1);
glTexCoord2f(1,0);glVertex2f(-0.25*current_aspect_ratio, -1);
glTexCoord2f(1,1);glVertex2f(-0.25*current_aspect_ratio, -0.25/current_aspect_ratio);
glTexCoord2f(0,1);glVertex2f(-1, -0.25/current_aspect_ratio);
glEnd();
glBindTexture(GL_TEXTURE_2D,0);
glDisable(GL_BLEND);
glEnable(GL_LIGHTING);
glPopMatrix();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
glDepthMask(GL_TRUE);
}
# endif //VISUALIZE_DEPTH_TEXTURE
}
static void GlutDestroyWindow(void);
static void GlutCreateWindow();
void GlutCloseWindow(void) {Config_Save(&config,ConfigFileName);}
void GlutNormalKeys(unsigned char key, int x, int y) {
const int mod = glutGetModifiers();
switch (key) {
case 27: // esc key
Config_Save(&config,ConfigFileName);
GlutDestroyWindow();
# ifdef __FREEGLUT_STD_H__
glutLeaveMainLoop();
# else
exit(0);
# endif
break;
case 13: // return key
{
if (mod&GLUT_ACTIVE_CTRL) {
config.fullscreen_enabled = gameModeWindowId ? 0 : 1;
GlutDestroyWindow();
GlutCreateWindow();
}
}
break;
}
}
static void updateCameraPos() {
const float distanceY = sin(cameraPitch)*cameraDistance;
const float distanceXZ = cos(cameraPitch)*cameraDistance;
cameraPos[0] = targetPos[0] + sin(cameraYaw)*distanceXZ;
cameraPos[1] = targetPos[1] + distanceY;
cameraPos[2] = targetPos[2] + cos(cameraYaw)*distanceXZ;
}
static void updateDirectionalLight() {
const float distanceY = sin(lightPitch);
const float distanceXZ = cos(lightPitch);
lightDirection[0] = sin(lightYaw)*distanceXZ;
lightDirection[1] = distanceY;
lightDirection[2] = cos(lightYaw)*distanceXZ;
Helper_Vector3Normalize(lightDirection);
lightDirection[3]=0.f;
}
static void resetCamera() {
// You can set the initial camera position here through:
targetPos[0]=0; targetPos[1]=0; targetPos[2]=0; // The camera target point
cameraYaw = 2*M_PI; // The camera rotation around the Y axis
cameraPitch = M_PI*0.125f; // The camera rotation around the XZ plane
cameraDistance = 5; // The distance between the camera position and the camera target point
updateCameraPos();
if (config.use_camera_ortho3d_projection_matrix) ResizeGL(current_width,current_height); // Needed because in Helper_Orho3D(...) cameraTargetDistance changes
}
static void resetLight() {
lightYaw = M_PI*0.425f;
lightPitch = M_PI*0.235f;
updateDirectionalLight();
}
void GlutSpecialKeys(int key,int x,int y)
{
const int mod = glutGetModifiers();
if (!(mod&GLUT_ACTIVE_CTRL) && !(mod&GLUT_ACTIVE_SHIFT)) {
switch (key) {
case GLUT_KEY_LEFT:
case GLUT_KEY_RIGHT:
cameraYaw+= instantFrameTime*cameraSpeed*(key==GLUT_KEY_LEFT ? -4.0f : 4.0f);
if (cameraYaw>M_PI) cameraYaw-=2*M_PI;
else if (cameraYaw<=-M_PI) cameraYaw+=2*M_PI;
updateCameraPos(); break;
case GLUT_KEY_UP:
case GLUT_KEY_DOWN:
cameraPitch+= instantFrameTime*cameraSpeed*(key==GLUT_KEY_UP ? 2.f : -2.f);
if (cameraPitch>M_PI-0.001f) cameraPitch=M_PI-0.001f;
else if (cameraPitch<-M_PI*0.05f) cameraPitch=-M_PI*0.05f;
updateCameraPos();
break;
case GLUT_KEY_PAGE_UP:
case GLUT_KEY_PAGE_DOWN:
cameraDistance+= instantFrameTime*cameraSpeed*(key==GLUT_KEY_PAGE_DOWN ? 25.0f : -25.0f);
if (cameraDistance<1.f) cameraDistance=1.f;
updateCameraPos();
if (config.use_camera_ortho3d_projection_matrix) ResizeGL(current_width,current_height); // Needed because in Helper_Orho3D(...) cameraTargetDistance changes
break;
case GLUT_KEY_F2:
config.show_fps = !config.show_fps;
//printf("showFPS: %s.\n",config.show_fps?"ON":"OFF");fflush(stdout);
break;
case GLUT_KEY_F1:
config.use_camera_ortho3d_projection_matrix = !config.use_camera_ortho3d_projection_matrix;
//printf("camera ortho mode: %s.\n",config.use_camera_ortho3d_projection_matrix?"ON":"OFF");fflush(stdout);
ResizeGL(current_width,current_height);
break;
case GLUT_KEY_HOME:
// Reset the camera
resetCamera();
break;
}
}
else if (mod&GLUT_ACTIVE_CTRL) {
switch (key) {
case GLUT_KEY_LEFT:
case GLUT_KEY_RIGHT:
case GLUT_KEY_UP:
case GLUT_KEY_DOWN:
{
// Here we move targetPos and cameraPos at the same time
// We must find a pivot relative to the camera here (ignoring Y)
float forward[3] = {targetPos[0]-cameraPos[0],0,targetPos[2]-cameraPos[2]};
float up[3] = {0,1,0};
float left[3];
Helper_Vector3Normalize(forward);
Helper_Vector3Cross(left,up,forward);
{
float delta[3] = {0,0,0};int i;
if (key==GLUT_KEY_LEFT || key==GLUT_KEY_RIGHT) {
float amount = instantFrameTime*cameraSpeed*(key==GLUT_KEY_RIGHT ? -25.0f : 25.0f);
for (i=0;i<3;i++) delta[i]+=amount*left[i];
}
else {
float amount = instantFrameTime*cameraSpeed*(key==GLUT_KEY_DOWN ? -25.0f : 25.0f);
for ( i=0;i<3;i++) delta[i]+=amount*forward[i];
}
for ( i=0;i<3;i++) {
targetPos[i]+=delta[i];
cameraPos[i]+=delta[i];
}
}
}
break;
case GLUT_KEY_PAGE_UP:
case GLUT_KEY_PAGE_DOWN:
// We use world space coords here.
targetPos[1]+= instantFrameTime*cameraSpeed*(key==GLUT_KEY_PAGE_DOWN ? -25.0f : 25.0f);
if (targetPos[1]<-50.f) targetPos[1]=-50.f;
else if (targetPos[1]>500.f) targetPos[1]=500.f;
updateCameraPos();
if (config.use_camera_ortho3d_projection_matrix) ResizeGL(current_width,current_height); // Needed because in Helper_Orho3D(...) cameraTargetDistance changes
break;
}
}
else if (mod&GLUT_ACTIVE_SHIFT) {
switch (key) {
case GLUT_KEY_LEFT:
case GLUT_KEY_RIGHT:
lightYaw+= instantFrameTime*cameraSpeed*(key==GLUT_KEY_LEFT ? -4.0f : 4.0f);
if (lightYaw>M_PI) lightYaw-=2*M_PI;
else if (lightYaw<=-M_PI) lightYaw+=2*M_PI;
updateDirectionalLight();
break;
case GLUT_KEY_UP:
case GLUT_KEY_DOWN:
case GLUT_KEY_PAGE_UP:
case GLUT_KEY_PAGE_DOWN:
lightPitch+= instantFrameTime*cameraSpeed*( (key==GLUT_KEY_UP || key==GLUT_KEY_PAGE_UP) ? 2.f : -2.f);
if (lightPitch>M_PI-0.001f) lightPitch=M_PI-0.001f;
else if (lightPitch<-M_PI*0.05f) lightPitch=-M_PI*0.05f;
updateDirectionalLight();