shadowmapping (#2)

includes/utils.h

@@ -36,4 +36,7 @@ void loadImg(const char *filename, const GLuint texture);
 // Copy a texture
 void copyTexture(const GLuint, const GLuint);
 
+// Get the current FBO ID
+GLuint getCurrentFramebufferID(void);
+
 #endif

shaders/credits.fs

@@ -1,4 +1,5 @@
 #version 330
+
 uniform sampler2D tex;
 in vec2 vsoTexCoord;
 out vec4 fragColor;

shaders/manif.fs

@@ -2,6 +2,7 @@
 
 in vec4 pos_model;
 in vec3 vec_normal;
+in vec4 shadowMapCoord;
 
 out vec4 fragColor;
 
@@ -11,6 +12,7 @@ uniform vec4 couleur;
 uniform vec4 lumPos[max];
 uniform mat4 view;
 uniform vec4 lumColor[max];
+uniform sampler2D shadowmap;
 
 void main() {
   const vec3 vue = vec3(0, 0, -1);
@@ -19,6 +21,12 @@ void main() {
   for(int i = 0; i < max; i++) {
     vec3 torche = normalize(pos_model.xyz - lumPos[i].xyz);
     float intensite_lumineuse = clamp(dot(vec_normal, -torche), 0., 1.);
+
+    vec3 shadowMapPcoord = shadowMapCoord.xyz / shadowMapCoord.w;
+    if(texture(shadowmap, shadowMapPcoord.xy).r < shadowMapPcoord.z) {
+      intensite_lumineuse = 0;
+    }
+
     vec3 reflet = (transpose(inverse(view)) * vec4(reflect(torche, vec_normal), 0)).xyz;
     float intensite_specularite = pow(clamp(dot(reflet, -vue), 0., 1.), 10);
 

shaders/manif.vs

@@ -5,12 +5,17 @@ layout(location = 1) in vec3 normal;
 
 out vec4 pos_model;
 out vec3 vec_normal;
+out vec4 shadowMapCoord;
 
 uniform mat4 proj, model, view;
+uniform mat4 lightView, lightProjection;
 
 void main() {
+  const mat4 bias = mat4(0.5, 0.0, 0.0, 0.0, 0.0, 0.5, 0.0, 0.0, 0.0, 0.0, 0.5, 0.0, 0.5, 0.5, 0.5, 1.0);
+
   pos_model = model * vec4(pos, 1);
   vec_normal = normalize(transpose(inverse(model)) * vec4(normal, 0)).xyz;
 
+  shadowMapCoord = bias * lightProjection * lightView * pos_model;
   gl_Position = proj * view * pos_model;
 }

shaders/shadowMap.fs

@@ -0,0 +1,4 @@
+#version 330
+
+void main(void) {
+}

shaders/shadowMap.vs

@@ -0,0 +1,12 @@
+
+#version 330
+
+uniform mat4 model;
+uniform mat4 lightView;
+uniform mat4 lightProjection;
+
+layout(location = 0) in vec3 vsiPosition;
+
+void main(void) {
+  gl_Position = lightProjection * lightView * model * vec4(vsiPosition, 1.0);
+}

src/animations.c

@@ -3,7 +3,8 @@
 /* Mise-à-jour des animations en fonction du son */
 static void update_with_audio(void (*)(int), void (*)(int), int);
 
-static GLuint _transition_pId[2] = {0}, _transition_tId = 0, _quadId = 0;
+static GLuint _transition_pId[2] = {0}, _transition_tId = 0, _quadId = 0,
+              _transition_fbo[2] = {0};
 static void transition_init(const char *, const int, GLuint *);
 static void transition_draw(void (*)(int), void (*)(int), Uint32, Uint32, int,
                             int, GLuint *);
@@ -23,6 +24,7 @@ void transitionsInit(void) {
   if (!_quadId) {
     _quadId = gl4dgGenQuadf();
   }
+  glGenFramebuffers(2, _transition_fbo);
 }
 
 void zoomIn(void (*a0)(int), void (*a1)(int), Uint32 t, Uint32 et,
@@ -74,23 +76,29 @@ static void transition_draw(void (*a0)(int), void (*a1)(int), Uint32 t,
   glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
                                         GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
                                         (GLint *)&_transition_tId);
+  GLint currentFramebufferID = getCurrentFramebufferID();
 
+  glBindFramebuffer(GL_FRAMEBUFFER, _transition_fbo[0]);
   glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
                          tex[0], 0);
   if (a0) {
     a0(state);
   }
 
+  glBindFramebuffer(GL_FRAMEBUFFER, _transition_fbo[1]);
   glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
                          tex[1], 0);
   if (a1) {
     a1(state);
   }
 
+  glBindFramebuffer(GL_FRAMEBUFFER, currentFramebufferID);
   glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
                          _transition_tId, 0);
 
   glDisable(GL_DEPTH_TEST);
+  glDisable(GL_CULL_FACE);
+
   glActiveTexture(GL_TEXTURE0);
   glBindTexture(GL_TEXTURE_2D, tex[0]);
   glActiveTexture(GL_TEXTURE1);
@@ -113,7 +121,11 @@ static void transition_draw(void (*a0)(int), void (*a1)(int), Uint32 t,
 static void transition_deinit(GLuint *tex) {
   if (tex[0]) {
     glDeleteTextures(2, tex);
-    tex[0] = tex[1] = 0;
+    tex[0] = 0;
+  }
+  if (_transition_fbo[0]) {
+    glDeleteFramebuffers(2, _transition_fbo);
+    _transition_fbo[0] = 0;
   }
 }
 

src/manif.c

@@ -1,17 +1,23 @@
 #include "../includes/animations.h"
 
-static GLuint _pId = 0;
+static GLuint _pId[2] = {0};
 static GLuint _planId = 0;
 
 #define HEROS_NUMBER 30 // should change in fragment shader too
 static struct manifestant _herosId[HEROS_NUMBER];
 
+#define SHADOW_MAP_SIDE 1024
+static GLuint _fbo = 0, _shadow_map_tex = 0;
+
 static const char *matrix_proj = "proj";
 static const char *matrix_model = "model";
 static const char *matrix_view = "view";
+static const char *matrix_lview = "lightView";
+static const char *matrix_lproj = "lightProjection";
 
 static void init(void);
 static void draw(void);
+static void deinit(void);
 
 void manif(const int state) {
   switch (state) {
@@ -23,6 +29,10 @@ void manif(const int state) {
     draw();
     break;
 
+  case GL4DH_FREE:
+    deinit();
+    break;
+
   default:
     break;
   }
@@ -39,27 +49,72 @@ static void init(void) {
     _herosId[i].ox = ((GLfloat)rand() / (GLfloat)RAND_MAX) * -50;
     _herosId[i].oz = 30 - ((GLfloat)rand() / (GLfloat)RAND_MAX) * 50;
   }
-  _pId =
+  _pId[0] =
       gl4duCreateProgram("<vs>shaders/manif.vs", "<fs>shaders/manif.fs", NULL);
 
+  _pId[1] = gl4duCreateProgram("<vs>shaders/shadowMap.vs",
+                               "<fs>shaders/shadowMap.fs", NULL);
+
   gl4duGenMatrix(GL_FLOAT, matrix_proj);
   gl4duGenMatrix(GL_FLOAT, matrix_model);
   gl4duGenMatrix(GL_FLOAT, matrix_view);
+  gl4duGenMatrix(GL_FLOAT, matrix_lview);
+  gl4duGenMatrix(GL_FLOAT, matrix_lproj);
+
+  // Création et paramétrage de la Texture de shadow map
+  glGenTextures(1, &_shadow_map_tex);
+  glBindTexture(GL_TEXTURE_2D, _shadow_map_tex);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+  glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, SHADOW_MAP_SIDE,
+               SHADOW_MAP_SIDE, 0, GL_DEPTH_COMPONENT, GL_FLOAT, NULL);
+
+  // Création du FBO
+  glGenFramebuffers(1, &_fbo);
 }
 
 static void draw(void) {
   static double t0 = 0;
   double dt = get_dt(&t0, GL_TRUE);
+  static float deplacement = 0;
 
   glEnable(GL_DEPTH_TEST);
+  glEnable(GL_CULL_FACE);
   glClearColor(0.2f, 0.2f, 0.8f, 1); // couleur ciel
+
+  glUseProgram(_pId[1]);
+
+  bindAndLoadf(matrix_lproj);
+  gl4duLoadIdentityf();
+  gl4duOrthof(-13, 13, -6, 6, 1, 40);
+
+  bindAndLoadf(matrix_lview);
+  gl4duLookAtf(9, 6, 0, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f);
+  glCullFace(GL_FRONT);
+
+  GLint currentFramebufferID = getCurrentFramebufferID();
+
+  glBindFramebuffer(GL_FRAMEBUFFER, _fbo);
+  glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D,
+                         _shadow_map_tex, 0);
+  glViewport(0, 0, SHADOW_MAP_SIDE, SHADOW_MAP_SIDE);
+  glClear(GL_DEPTH_BUFFER_BIT);
+  for (int i = 0; i < HEROS_NUMBER; ++i) {
+    drawManifestant(matrix_model, &_herosId[i], deplacement, GL_TRUE);
+  }
+  glBindFramebuffer(GL_FRAMEBUFFER, currentFramebufferID);
+
+  glCullFace(GL_BACK);
+  glDrawBuffer(GL_COLOR_ATTACHMENT0);
+
+  glViewport(0, 0, _dims[0], _dims[1]);
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-  glUseProgram(_pId);
+  glCullFace(GL_FRONT_FACE);
+  glUseProgram(_pId[0]);
 
   const GLfloat couleur_plan[] = {0.3f, 0.3f, 0.3f, 1},
                 couleur_heros[] = {1, 1, 0, 1};
-  GLint couleur_gpu = glGetUniformLocation(_pId, "couleur");
-  static float deplacement = 0;
+  GLint couleur_gpu = glGetUniformLocation(_pId[0], "couleur");
 
   bindAndLoadf(matrix_proj);
   GLfloat ratio = (GLfloat)_dims[0] / (GLfloat)_dims[1];
@@ -96,11 +151,26 @@ static void draw(void) {
     drawManifestant(matrix_model, &_herosId[i], deplacement, GL_TRUE);
   }
 
+  glActiveTexture(GL_TEXTURE0);
+  glBindTexture(GL_TEXTURE_2D, _shadow_map_tex);
   int max_gpu = 3; // HEROS_NUMBER;
-  glUniform4fv(glGetUniformLocation(_pId, "lumPos"), max_gpu, (float *)lumpos);
-  glUniform4fv(glGetUniformLocation(_pId, "lumColor"), max_gpu,
+  glUniform4fv(glGetUniformLocation(_pId[0], "lumPos"), max_gpu,
+               (float *)lumpos);
+  glUniform4fv(glGetUniformLocation(_pId[0], "lumColor"), max_gpu,
                (float *)lumcolor);
+  glUniform1i(glGetUniformLocation(_pId[0], "shadowmap"), 0);
 
   deplacement += (float)(0.4 * M_PI * dt);
   glUseProgram(0);
+
+  glDisable(GL_DEPTH_TEST);
+  glDisable(GL_CULL_FACE);
+}
+
+static void deinit(void) {
+  if (_fbo) {
+    glDeleteTextures(1, &_shadow_map_tex);
+    glDeleteFramebuffers(1, &_fbo);
+    _fbo = 0;
+  }
 }

src/tag.c

@@ -104,6 +104,7 @@ static void draw(void) {
 
   glUseProgram(0);
   glBindTexture(GL_TEXTURE_2D, 0);
+  glDisable(GL_DEPTH_TEST);
 }
 
 static void deinit(void) {

src/utils.c

@@ -88,3 +88,10 @@ void copyTexture(const GLuint src, const GLuint dst) {
   SDL_FreeSurface(s);
   glBindTexture(GL_TEXTURE_2D, 0);
 }
+
+GLuint getCurrentFramebufferID(void) {
+  GLint currentFramebufferID = 0;
+  glGetIntegerv(GL_FRAMEBUFFER_BINDING, &currentFramebufferID);
+
+  return currentFramebufferID;
+}