render.c

   1 #include <GL/glut.h>
   2 #include <stdbool.h>
   3
   4 #include "level.h"
   5 #include "performance.h"
   6 #include "render.h"
   7 #include "typedefs.h"
   8
   9 const float AXIS_RADIUS = 5.0f;
  10
  11 static void renderBlockGrid(const BlockGrid grid);
  12 static void drawBlock(const Block* block);
  13
  14 void initRender() {
  15         glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
  16
  17         GLfloat light0_ambient[] = {0.1f, 0.1f, 0.1f, 1.0f};
  18         GLfloat light0_diffuse[] = {1.0f, 1.0f, 1.0f, 1.0f};
  19         GLfloat light0_specular[] = {1.0f, 1.0f, 1.0f, 1.0f};
  20         GLfloat light0_position[] = {5.0f, 10.0f, 5.0f, 1.0f};
  21
  22         glLightfv(GL_LIGHT0, GL_AMBIENT, light0_ambient);
  23         glLightfv(GL_LIGHT0, GL_DIFFUSE, light0_diffuse);
  24         glLightfv(GL_LIGHT0, GL_SPECULAR, light0_specular);
  25         glLightfv(GL_LIGHT0, GL_POSITION, light0_position);
  26
  27         glLightf(GL_LIGHT0, GL_CONSTANT_ATTENUATION, 1.0f);
  28         glLightf(GL_LIGHT0, GL_LINEAR_ATTENUATION, 0.05f);
  29         glLightf(GL_LIGHT0, GL_QUADRATIC_ATTENUATION, 0.005f);
  30 }
  31
  32 void renderScene() {
  33         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  34         glLoadIdentity();
  35
  36         glEnable(GL_NORMALIZE);
  37         glEnable(GL_CULL_FACE);
  38         glEnable(GL_DEPTH_TEST);
  39
  40         glDisable(GL_LIGHTING);
  41         drawAxes();
  42         glEnable(GL_LIGHTING);
  43
  44         glEnable(GL_LIGHT0);
  45         glEnable(GL_TEXTURE_2D);
  46 //      drawSceneRecursive(levelScene, levelScene->mRootNode);
  47         renderBlockGrid(levelGrid);
  48         glDisable(GL_TEXTURE_2D);
  49         glDisable(GL_LIGHT0);
  50
  51         glFlush();
  52         glutSwapBuffers();
  53         frameRendered();
  54         glutPostRedisplay();
  55 }
  56
  57 void drawAxes() {
  58         point3f xAxisStart = { 0.0f, 0.0f, 0.0f };
  59         point3f xAxisEnd = { AXIS_RADIUS, 0.0f, 0.0f };
  60         point3f yAxisStart = { 0.0f, 0.0f, 0.0f };
  61         point3f yAxisEnd = { 0.0f, AXIS_RADIUS, 0.0f };
  62         point3f zAxisStart = { 0.0f, 0.0f, 0.0f };
  63         point3f zAxisEnd = { 0.0f, 0.0f, AXIS_RADIUS };
  64
  65         glColor3f(1.0f, 0.0f, 0.0f);
  66         glBegin(GL_LINES);
  67         glVertex3fv(xAxisStart);
  68         glVertex3fv(xAxisEnd);
  69         glEnd();
  70
  71         glColor3f(0.0f, 1.0f, 0.0f);
  72         glBegin(GL_LINES);
  73         glVertex3fv(yAxisStart);
  74         glVertex3fv(yAxisEnd);
  75         glEnd();
  76
  77         glColor3f(0.0f, 0.0f, 1.0f);
  78         glBegin(GL_LINES);
  79         glVertex3fv(zAxisStart);
  80         glVertex3fv(zAxisEnd);
  81         glEnd();
  82 }
  83
  84 static void renderBlockGrid(const BlockGrid grid) {
  85         glMatrixMode(GL_MODELVIEW);
  86         for (int z = 0; z < grid.depth; ++z) {
  87                 glLoadIdentity();
  88                 glTranslatef(0.0f, 0.0f, z * BLOCKGRID_CELL_SIZE);
  89                 for (int x = 0; x < grid.width; ++x) {
  90                         drawBlock(getBlockFromGrid(grid, x, z));
  91                         glTranslatef(BLOCKGRID_CELL_SIZE, 0.0f, 0.0f);
  92                 }
  93         }
  94         glLoadIdentity();
  95 }
  96
  97 static void drawBlock(const Block* block) {
  98         if (block->sceneData == NULL) {
  99                 return;
 100         }
 101
 102         glColor3f(0.5f, 1.0f, 0.0f);
 103
 104         for (int i = 0; i < block->sceneData->mNumMeshes; ++i) {
 105                 glBindTexture(GL_TEXTURE_2D, block->textureIds[i]);
 106                 const AiMesh* mesh = block->sceneData->mMeshes[i];
 107                 bool hasNormals = mesh->mNormals != NULL;
 108                 bool hasTextureCoords = mesh->mTextureCoords[0] != NULL;
 109
 110                 for (int k = 0; k < mesh->mNumFaces; ++k) {
 111                         const AiFace face = mesh->mFaces[k];
 112
 113                         GLenum faceMode;
 114                         switch (face.mNumIndices) {
 115                                 case 1: faceMode = GL_POINTS; break;
 116                                 case 2: faceMode = GL_LINES; break;
 117                                 case 3: faceMode = GL_TRIANGLES; break;
 118                                 default: faceMode = GL_POLYGON; break;
 119                         }
 120
 121                         glBegin(faceMode);
 122
 123                         for (int l = 0; l < face.mNumIndices; ++l) {
 124                                 unsigned int vertexIndex = face.mIndices[l];
 125                                 if (hasNormals) {
 126                                         if (hasTextureCoords) {
 127                                                 AiVector3D coords = mesh->mTextureCoords[0][vertexIndex];
 128                                                 glTexCoord2f(coords.x, coords.y);
 129                                         }
 130                                         glNormal3fv(&mesh->mNormals[vertexIndex].x);
 131                                 }
 132                                 glVertex3fv((const GLfloat*) &mesh->mVertices[vertexIndex]);
 133                         }
 134
 135                         glEnd();
 136                 }
 137         }
 138         glBindTexture(GL_TEXTURE_2D, 0);
 139 }
 140
 141 void drawSceneRecursive(const AiScene* scene, const AiNode* node) {
 142         if (((*scene).mFlags & AI_SCENE_FLAGS_INCOMPLETE) == AI_SCENE_FLAGS_INCOMPLETE) {
 143                 return;
 144         }
 145
 146         for (int i = 0; i < (*node).mNumMeshes; ++i) {
 147                 const AiMesh* mesh = (*scene).mMeshes[(*node).mMeshes[i]];
 148
 149                 for (int k = 0; k < (*mesh).mNumFaces; ++k) {
 150                         const AiFace face = (*mesh).mFaces[k];
 151
 152                         GLenum faceMode;
 153                         switch (face.mNumIndices) {
 154                                 case 1: faceMode = GL_POINTS; break;
 155                                 case 2: faceMode = GL_LINES; break;
 156                                 case 3: faceMode = GL_TRIANGLES; break;
 157                                 default: faceMode = GL_POLYGON; break;
 158                         }
 159
 160                         glBegin(faceMode);
 161
 162                         glColor3f(1.0f, 1.0f, 1.0f);
 163                         for (int l = 0; l < face.mNumIndices; ++l) {
 164                                 glVertex3fv((const GLfloat*) &(*mesh).mVertices[face.mIndices[l]]);
 165                         }
 166
 167                         glEnd();
 168                 }
 169         }
 170
 171         for (int i = 0; i < (*node).mNumChildren; ++i) {
 172                 drawSceneRecursive(scene, (*node).mChildren[i]);
 173         }
 174 }