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variance_shadow_mapping.c
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// https://github.com/Flix01/Tiny-OpenGL-Shadow-Mapping-Examples
// This demo is greatly based on http://fabiensanglard.net/shadowmappingVSM/
// Blur filters are based on https://github.com/Jam3/glsl-fast-gaussian-blur/ (MIT licensed)
/** 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 variance_shadow_mapping.c -o variance_shadow_mapping -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 variance_shadow_mapping.c /D"GLEW_STATIC" /I"../" /link /out:variance_shadow_mapping.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)
#define PROGRAM_NAME "variance_shadow_mapping"
#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_MIPMAP_LINEAR // GL_LINEAR_MIPMAP_LINEAR or GL_LINEAR
//#define SHADOW_MAP_BLUR_USING_BOX_FILTER // Optional [Not sure code is correct]
#define SHADOW_MAP_BLUR_KERNEL_SIZE 5 // 0 or 1 (=no blur); 3, 5, 9, 13 valid values (when SHADOW_MAP_BLUR_USING_BOX_FILTER is NOT defined)
//#define SHADOW_MAP_USE_SMOOTHSTEP_FOR_LIGHT_BLEEDING_REDUCTION // Otherwise linear step is used (cheaper?)
//#define __EMSCRIPTEN__ // This is just a hack to use a 16bit texture format to save half of GPU memory (of course all these demos use the fixed function pipeline and can't work on emscripten as they are)
// Also it needs a higher bias and lightBleedingReduction too (we auto-tweak the latter).
//#define SHADOW_MAP_USE_OPTIMIZED_MOMENT_QUANTIZATION // Optimization for 2 moments proposed in http://cg.cs.uni-bonn.de/aigaion2root/attachments/MomentShadowMapping.pdf
// [But differences are probably visible in 16-bit mode only, without using any light bleeding reduction...]
// Not sure if the following is better or not... I would not use it, so that shaders are more portable
//#define USE_GLSL_TEXTUREGRAD
// 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)
#if (!defined(SHADOW_MAP_BLUR_KERNEL_SIZE) || SHADOW_MAP_BLUR_KERNEL_SIZE<=0)
# undef SHADOW_MAP_BLUR_KERNEL_SIZE
# define SHADOW_MAP_BLUR_KERNEL_SIZE 1
#endif
#if (SHADOW_MAP_BLUR_KERNEL_SIZE==(SHADOW_MAP_BLUR_KERNEL_SIZE/2)*2)
# error SHADOW_MAP_BLUR_KERNEL_SIZE must be an odd number
#endif
#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;
} 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;
}
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 4:
sscanf(buf, "%d", &c->show_fps);
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,"\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]; // projection matrix
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.
static const char* ShadowPassVertexShader[] = {
"varying vec4 v_position;\n"
"\n"
" void main() {\n"
" gl_Position = ftransform();\n"
" v_position = gl_Position;\n"
" }\n"
};
static const char* ShadowPassFragmentShader[] = { // From http://fabiensanglard.net/shadowmappingVSM/index.php
"varying vec4 v_position;\n"
"\n"
"vec2 ComputeMoments(float FragmentDepth) {\n"
" vec2 mu = vec2(FragmentDepth,FragmentDepth*FragmentDepth);\n"
" // Adjusting moments (this is sort of bias per pixel) using derivative\n"
" // (However many implementations just skip these 3 lines)\n"
" float dx = dFdx(FragmentDepth);\n"
" float dy = dFdy(FragmentDepth);\n"
" mu.y += 0.25*(dx*dx+dy*dy);\n"
# ifdef SHADOW_MAP_USE_OPTIMIZED_MOMENT_QUANTIZATION
" mu.y = 4.0*(mu.x-mu.y);\n"
# endif //SHADOW_MAP_USE_OPTIMIZED_MOMENT_QUANTIZATION
" return mu;\n"
"}\n"
"\n"
" void main() {\n"
" float depth = v_position.z/v_position.w;\n"
" depth = depth * 0.5 + 0.5; //Don't forget to move away from unit cube ([-1,1]) to [0,1] coordinate system\n"
"\n"
" gl_FragColor = vec4(ComputeMoments(depth).xy,0.0,0.0);\n"
" }\n"
};
typedef struct {
GLuint fbo;
GLuint depthTextureId;
GLuint colorTextureId;
GLuint program;
} ShadowPass;
ShadowPass shadowPass;
void InitShadowPass(ShadowPass* sp) {
sp->program = Helper_LoadShaderProgramFromSource(*ShadowPassVertexShader,*ShadowPassFragmentShader);
// create depth texture
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, SHADOW_MAP_RESOLUTION, SHADOW_MAP_RESOLUTION, 0, GL_DEPTH_COMPONENT, GL_FLOAT, 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 texture
glGenTextures(1, &sp->colorTextureId);
glBindTexture(GL_TEXTURE_2D, sp->colorTextureId);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, SHADOW_MAP_FILTER);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
# ifndef __EMSCRIPTEN__
glTexImage2D( GL_TEXTURE_2D, 0, GL_RG32F, SHADOW_MAP_RESOLUTION, SHADOW_MAP_RESOLUTION, 0, GL_RG, GL_FLOAT, 0);
# else //__EMSCRIPTEN__
glTexImage2D( GL_TEXTURE_2D, 0, GL_RG16F, SHADOW_MAP_RESOLUTION, SHADOW_MAP_RESOLUTION, 0, GL_RG, GL_FLOAT, 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 );
# if (SHADOW_MAP_FILTER==GL_LINEAR_MIPMAP_LINEAR || SHADOW_MAP_FILTER==GL_LINEAR_MIPMAP_NEAREST || SHADOW_MAP_FILTER==GL_NEAREST_MIPMAP_LINEAR || SHADOW_MAP_FILTER==GL_NEAREST_MIPMAP_NEAREST)
glGenerateMipmap(GL_TEXTURE_2D);
# endif
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); // Maybe this line can be activated
# endif //__EMSCRIPTEN__
glFramebufferTexture2D(GL_FRAMEBUFFER,GL_COLOR_ATTACHMENT0,GL_TEXTURE_2D, sp->colorTextureId, 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 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->depthTextureId) {glDeleteTextures(1,&sp->depthTextureId);sp->depthTextureId=0;}
if (sp->colorTextureId) {glDeleteTextures(1,&sp->colorTextureId);sp->colorTextureId=0;}
}
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 to 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_shadowLightBleedingReductionAndDarkening;\n" // Both values in [0.0-1.0]
"varying vec4 v_shadowCoord;\n"
"varying vec4 v_diffuse;\n"
"\n"
"float linstep(float low, float high, float v) {\n"
" return clamp((v-low)/(high-low), 0.0, 1.0);\n"
"}\n"
"\n"
"float chebyshevUpperBound(vec2 moments,float distance) {\n"
" // Surface is fully lit. as the current fragment is before the light occluder\n"
" if (distance <= moments.x) return 1.0;\n" // Can we remove this branch ?
"\n"
" // The fragment is either in shadow or penumbra. "
" // We now use chebyshev's upperBound to check\n"
" // How likely this pixel is to be lit (p_max)\n"
" float variance = moments.y - (moments.x*moments.x);\n"
" variance = max(variance,0.0000000001);\n" // Here we can specify the minimum variance (it affects Peter Panning) [It seems that smaller is better]
"\n"
" float d = distance - moments.x;\n"
" float p_max = variance / (variance + d*d);\n" // 0<p_max<1
"\n"
# ifdef SHADOW_MAP_TEST_TO_REMOVE // Attempt to handle half of LightBleedingReduction without hard-shadowing too much... (u_shadowLightBleedingReductionAndDarkening.x should be halved when this is enabled)
" if (p_max>0.92) p_max*=p_max;\n"
" p_max*=p_max;p_max*=p_max;\n"
# endif //SHADOW_MAP_TEST_TO_REMOVE
# ifdef SHADOW_MAP_USE_SMOOTHSTEP_FOR_LIGHT_BLEEDING_REDUCTION
" p_max = smoothstep(u_shadowLightBleedingReductionAndDarkening.x,1.0,p_max);\n"
# else //SHADOW_MAP_USE_SMOOTHSTEP_FOR_LIGHT_BLEEDING_REDUCTION
" p_max = linstep(u_shadowLightBleedingReductionAndDarkening.x,1.0,p_max);\n"
# endif //SHADOW_MAP_USE_SMOOTHSTEP_FOR_LIGHT_BLEEDING_REDUCTION
" return p_max;\n"
"}\n"
"\n"
"vec2 ConvertMoments(vec2 optimizedMoments) {\n"
# ifdef SHADOW_MAP_USE_OPTIMIZED_MOMENT_QUANTIZATION
" optimizedMoments.y = optimizedMoments.x-0.25*optimizedMoments.y;\n"
# endif //SHADOW_MAP_USE_OPTIMIZED_MOMENT_QUANTIZATION
" return optimizedMoments;\n"
"}\n"
"\n"
"void main() {\n"
" vec4 shadowCoordinateWdivide = v_shadowCoord/v_shadowCoord.w;\n"
# ifdef USE_GLSL_TEXTUREGRAD // https://github.com/TheRealMJP/Shadows uses this... but I'm not sure if it's really necessary or not...
" vec3 shadowPosDX = dFdx(shadowCoordinateWdivide).xyz;\n" // These seem to work even when they are vec2. What's the difference ?
" vec3 shadowPosDY = dFdy(shadowCoordinateWdivide).xyz;\n"
" vec2 moments = ConvertMoments(textureGrad(u_shadowMap, shadowCoordinateWdivide.xy, shadowPosDX, shadowPosDY).xy);\n"
# else // USE_GLSL_TEXTUREGRAD
" vec2 moments = ConvertMoments(texture2D(u_shadowMap, shadowCoordinateWdivide.xy).xy);\n"
# endif //USE_GLSL_TEXTUREGRAD
" float shadowFactor = chebyshevUpperBound(moments.st,shadowCoordinateWdivide.z);\n"
" shadowFactor = u_shadowLightBleedingReductionAndDarkening.y + (1.0-u_shadowLightBleedingReductionAndDarkening.y)*shadowFactor;\n"
" \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_shadowLightBleedingReductionAndDarkening;
} DefaultPass;
DefaultPass defaultPass;
void InitDefaultPass(DefaultPass* dp) {
const float shadowLightness = 0.5;
const float lightBleedingReduction =
# ifndef __EMSCRIPTEN__ // 32-bit textures
0.925 //0.925
# else //__EMSCRIPTEN__ // 16-bit textures
1.0
# endif //__EMSCRIPTEN__
;
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_shadowLightBleedingReductionAndDarkening = glGetUniformLocation(dp->program,"u_shadowLightBleedingReductionAndDarkening");
glUseProgram(dp->program);
glUniform1i(dp->uniform_location_shadowMap,0);
glUniform2f(dp->uniform_location_shadowLightBleedingReductionAndDarkening,lightBleedingReduction,shadowLightness); // Both values in [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;}
}
#if SHADOW_MAP_BLUR_KERNEL_SIZE>1
// Mostly adapted from the Github repository: https://github.com/Jam3/glsl-fast-gaussian-blur/ (MIT license)
// Probably to be optimized a bit... Also there's no penumbra. Why ?
static const char* BlurPassVertexShader[] = {
"varying vec2 v_uv;\n"
"\n"
"void main() {\n"
" gl_Position = gl_Vertex;\n"
" v_uv = gl_MultiTexCoord0.xy;\n"
"}\n"
};
static const char* BlurPassFragmentShader[] = {
"#define SHADOW_MAP_BLUR_KERNEL_SIZE "XSTR_MACRO(SHADOW_MAP_BLUR_KERNEL_SIZE)"\n"
"uniform vec2 u_resolution;\n" // Maybe using the C macro would be faster
"uniform sampler2D u_sampler;\n"
"uniform vec2 u_direction;\n"
"\n"
"varying vec2 v_uv;\n"
"\n"
# ifndef SHADOW_MAP_BLUR_USING_BOX_FILTER
# if SHADOW_MAP_BLUR_KERNEL_SIZE==3
" vec2 blur(sampler2D image,vec2 uv,vec2 resolution,vec2 direction) {\n" // Not in https://github.com/Jam3/glsl-fast-gaussian-blur/. [Not sure code is correct]
" vec2 color = vec2(0.0);\n"
" vec2 off1 = vec2(0.5) * direction / resolution;\n"
" color += texture2D(image, uv + off1).rg * 0.5;\n"
" color += texture2D(image, uv - off1).rg * 0.5;\n"
" return color;\n"
" }\n"
"\n"
# elif SHADOW_MAP_BLUR_KERNEL_SIZE==5
" vec2 blur(sampler2D image,vec2 uv,vec2 resolution,vec2 direction) {\n"
" vec2 color = vec2(0.0);\n"
" vec2 off1 = vec2(1.3333333333333333) * direction / resolution;\n"
" color += texture2D(image, uv).rg * 0.29411764705882354;\n"
" color += texture2D(image, uv + off1).rg * 0.35294117647058826;\n"
" color += texture2D(image, uv - off1).rg * 0.35294117647058826;\n"
" return color;\n"
" }\n"
"\n"
# elif SHADOW_MAP_BLUR_KERNEL_SIZE==9
" vec2 blur(sampler2D image,vec2 uv,vec2 resolution,vec2 direction) {\n"
" vec2 color = vec2(0.0);\n"
" vec2 off1 = vec2(1.3846153846) * direction / resolution;\n"
" vec2 off2 = vec2(3.2307692308) * direction / resolution;\n"
" color += texture2D(image, uv).rg * 0.2270270270;\n"
" color += texture2D(image, uv + off1).rg * 0.3162162162;\n"
" color += texture2D(image, uv - off1).rg * 0.3162162162;\n"
" color += texture2D(image, uv + off2).rg * 0.0702702703;\n"
" color += texture2D(image, uv - off2).rg * 0.0702702703;\n"
" return color;\n"
" }\n"
"\n"
# elif SHADOW_MAP_BLUR_KERNEL_SIZE==13
" vec2 blur(sampler2D image,vec2 uv,vec2 resolution,vec2 direction) {\n"
" vec2 color = vec2(0.0);\n"
" vec2 off1 = vec2(1.411764705882353) * direction / resolution;\n"
" vec2 off2 = vec2(3.2941176470588234) * direction / resolution;\n"
" vec2 off3 = vec2(5.176470588235294) * direction / resolution;\n"
" color += texture2D(image, uv).rg * 0.1964825501511404;\n"
" color += texture2D(image, uv + off1).rg * 0.2969069646728344;\n"
" color += texture2D(image, uv - off1).rg * 0.2969069646728344;\n"
" color += texture2D(image, uv + off2).rg * 0.09447039785044732;\n"
" color += texture2D(image, uv - off2).rg * 0.09447039785044732;\n"
" color += texture2D(image, uv + off3).rg * 0.010381362401148057;\n"
" color += texture2D(image, uv - off3).rg * 0.010381362401148057;\n"
" return color;\n"
" }\n"
"\n"
# else // SHADOW_MAP_BLUR_KERNEL_SIZE
# error SHADOW_MAP_BLUR_KERNEL_SIZE unsupported value
# endif // SHADOW_MAP_BLUR_KERNEL_SIZE
# else //SHADOW_MAP_BLUR_USING_BOX_FILTER
" vec2 blur(sampler2D image,vec2 uv,vec2 resolution,vec2 direction) {\n" // Made this myself [Not sure code is correct]
" const float edgeVal = 0.5+float((SHADOW_MAP_BLUR_KERNEL_SIZE/2-1));\n"
" const float startVal = -edgeVal;\n"
" const float endVal = edgeVal+0.5;\n" // we use +0.5 and < instead of <= in the for loop (more robust)
" vec2 off = direction/resolution;\n"
" float x;\n"
" vec2 color = vec2(0.0);\n"
" for (x=startVal;x<endVal;x+=1.0) {\n"
" color+=texture2D(image, uv+vec2(x*off.x,x*off.y)).rg;\n"
" }\n"
" color/=float(SHADOW_MAP_BLUR_KERNEL_SIZE-1);\n"
" return color;\n"
" }\n"
# endif //SHADOW_MAP_BLUR_USING_BOX_FILTER
"void main() {\n"
" gl_FragColor = vec4(blur(u_sampler,v_uv,u_resolution.xy,u_direction),0.0,0.0);"
"}\n"
};
typedef struct {
GLuint program;
GLuint textureId;
GLuint fbo;
GLint uniform_location_resolution;
GLint uniform_location_sampler;
GLint uniform_location_direction;
} BlurPass;
BlurPass blurPass;
void InitBlurPass(BlurPass* bp) {
bp->program = Helper_LoadShaderProgramFromSource(*BlurPassVertexShader,*BlurPassFragmentShader);
bp->uniform_location_resolution = glGetUniformLocation(bp->program,"u_resolution");
bp->uniform_location_sampler = glGetUniformLocation(bp->program,"u_sampler");
bp->uniform_location_direction = glGetUniformLocation(bp->program,"u_direction");
glUseProgram(bp->program);
glUniform1i(bp->uniform_location_sampler,0);
glUniform2f(bp->uniform_location_resolution,(float)(SHADOW_MAP_RESOLUTION),(float)(SHADOW_MAP_RESOLUTION));
glUniform2f(bp->uniform_location_direction,1.0f,0.0f);
glUseProgram(0);
// create texture
glGenTextures(1, &bp->textureId);
glBindTexture(GL_TEXTURE_2D, bp->textureId);
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_RG32F, SHADOW_MAP_RESOLUTION, SHADOW_MAP_RESOLUTION, 0, GL_RG, GL_FLOAT, 0);
# else //__EMSCRIPTEN__
glTexImage2D( GL_TEXTURE_2D, 0, GL_RG16F, SHADOW_MAP_RESOLUTION, SHADOW_MAP_RESOLUTION, 0, GL_RG, GL_FLOAT, 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, &bp->fbo);
glBindFramebuffer(GL_FRAMEBUFFER, bp->fbo);
# 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, bp->textureId, 0);
{
//Does the GPU support current FBO configuration?
GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
if (status!=GL_FRAMEBUFFER_COMPLETE) printf("glCheckFramebufferStatus(...) FAILED for blurPass.fbo.\n");
}
glBindFramebuffer(GL_FRAMEBUFFER, 0);
}
void DestroyBlurPass(BlurPass* bp) {
if (bp->program) {glDeleteProgram(bp->program);bp->program=0;}
if (bp->fbo) {glDeleteBuffers(1,&bp->fbo);bp->fbo=0;}
if (bp->textureId) {glDeleteTextures(1,&bp->textureId);bp->textureId=0;}
}
#endif //SHADOW_MAP_BLUR_KERNEL_SIZE
float current_width=0,current_height=0,current_aspect_ratio=1; // Not sure when I've used these...
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
Helper_Perspective(pMatrix,pMatrixFovyDeg,(float)w/(float)h,pMatrixNearPlane,pMatrixFarPlane);
glMatrixMode(GL_PROJECTION);glLoadMatrixf(pMatrix);glMatrixMode(GL_MODELVIEW);
}
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);
# if SHADOW_MAP_BLUR_KERNEL_SIZE>1
InitBlurPass(&blurPass);
# endif
// New
# ifdef USE_GLSL_TEXTUREGRAD
//glHint(GL_FRAGMENT_SHADER_DERIVATIVE_HINT,GL_NICEST); // Optional if USE_GLSL_TEXTUREGRAD is defined in the default pass fragment shader (GL_FASTEST, GL_NICEST, and GL_DONT_CARE)
# endif //USE_GLSL_TEXTUREGRAD
// 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);
# if SHADOW_MAP_BLUR_KERNEL_SIZE>1
DestroyBlurPass(&blurPass);
# endif
// 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------------------------------------------------------------------------------------------
{
Helper_GetLightViewProjectionMatrix(lvpMatrix,
vMatrixInverse,pMatrixNearPlane,pMatrixFarPlane,pMatrixFovyDeg,current_aspect_ratio,
lightDirection,1.0f/(float)SHADOW_MAP_RESOLUTION);
// 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);
glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
glColorMask(GL_TRUE, GL_TRUE, GL_FALSE, GL_FALSE);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
//glCullFace(GL_FRONT);
//glEnable(GL_POLYGON_OFFSET_FILL);glPolygonOffset(-2.0f, -2.0f);
glEnable(GL_DEPTH_CLAMP);
glDisable(GL_LIGHTING);
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);
glEnable(GL_LIGHTING);
glDisable(GL_DEPTH_CLAMP);
//glDisable(GL_POLYGON_OFFSET_FILL);
//glCullFace(GL_BACK);
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
glBindFramebuffer(GL_FRAMEBUFFER,0);
glMatrixMode(GL_PROJECTION);glPopMatrix();glMatrixMode(GL_MODELVIEW);
}
# if SHADOW_MAP_BLUR_KERNEL_SIZE>1
// Blur shadow map
{
int i;
glMatrixMode(GL_PROJECTION);glPushMatrix();glLoadIdentity();
glMatrixMode(GL_MODELVIEW);glPushMatrix();glLoadIdentity();
glDisable(GL_DEPTH_TEST);glDepthMask(GL_FALSE);glDisable(GL_CULL_FACE);glDisable(GL_LIGHTING);
glColorMask(GL_TRUE, GL_TRUE, GL_FALSE, GL_FALSE);
glViewport(0, 0, SHADOW_MAP_RESOLUTION,SHADOW_MAP_RESOLUTION);
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] = {blurPass.fbo,shadowPass.fbo}; // Target texture
const GLuint TEXTs[2] = {shadowPass.colorTextureId,blurPass.textureId}; // Source texture
glBindFramebuffer(GL_FRAMEBUFFER, FBOs[i]);
glUseProgram(blurPass.program);
glClear(GL_COLOR_BUFFER_BIT);
glBindTexture(GL_TEXTURE_2D,TEXTs[i]);
if (i==0) glUniform2f(blurPass.uniform_location_direction,1.0f,0.0f); // Horizontal
else glUniform2f(blurPass.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();
}
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glUseProgram(0);
glBindTexture(GL_TEXTURE_2D,0);
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
glEnable(GL_DEPTH_TEST);glDepthMask(GL_TRUE);glEnable(GL_CULL_FACE);glEnable(GL_LIGHTING);
glMatrixMode(GL_PROJECTION);glPopMatrix();
glMatrixMode(GL_MODELVIEW);glPopMatrix();
}
# endif //SHADOW_MAP_BLUR_KERNEL_SIZE>1
// Draw world
{
// 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 [-1,1] to [0,1]
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 world
glViewport(0, 0, current_width,current_height);
glClearColor(0.3f, 0.6f, 1.0f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glBindTexture(GL_TEXTURE_2D,shadowPass.colorTextureId); // or shadowPass.colorTextureId ???
# if (SHADOW_MAP_FILTER==GL_LINEAR_MIPMAP_LINEAR || SHADOW_MAP_FILTER==GL_LINEAR_MIPMAP_NEAREST || SHADOW_MAP_FILTER==GL_NEAREST_MIPMAP_LINEAR || SHADOW_MAP_FILTER==GL_NEAREST_MIPMAP_NEAREST)
glGenerateMipmap(GL_TEXTURE_2D);
# endif
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);
}
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.colorTextureId);
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();
}
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();
break;
case GLUT_KEY_F1:
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_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();
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;