449 lines
13 KiB
C
449 lines
13 KiB
C
/* ----------------------------------------------------------------------------
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// Simple sample to prove that Assimp is easy to use with OpenGL.
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// It takes a file name as command line parameter, loads it using standard
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// settings and displays it.
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//
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// If you intend to _use_ this code sample in your app, do yourself a favour
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// and replace immediate mode calls with VBOs ...
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//
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// The vc8 solution links against assimp-release-dll_win32 - be sure to
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// have this configuration built.
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// ----------------------------------------------------------------------------
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#ifdef __APPLE__
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#include <freeglut.h>
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#else
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#include <GL/freeglut.h>
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#endif
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/* assimp include files. These three are usually needed. */
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#include <assimp/cimport.h>
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#include <assimp/scene.h>
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#include <assimp/postprocess.h>
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#define COMMAND_USAGE "--usage"
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/* ---------------------------------------------------------------------------- */
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inline static void print_run_command(const char* command_name) {
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printf("Run '%s %s' for more information.\n",
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PROJECT_NAME, command_name);
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}
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/* ---------------------------------------------------------------------------- */
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inline static void print_error(const char* msg) {
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printf("ERROR: %s\n", msg);
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}
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#define NEW_LINE "\n"
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#define DOUBLE_NEW_LINE NEW_LINE NEW_LINE
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/* ---------------------------------------------------------------------------- */
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inline static void print_usage() {
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static const char* usage_format =
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"Usage: "
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PROJECT_NAME
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" <file>" DOUBLE_NEW_LINE
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"where:" DOUBLE_NEW_LINE
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" %-10s %s" DOUBLE_NEW_LINE
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"options:" DOUBLE_NEW_LINE
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" %-10s %s" DOUBLE_NEW_LINE;
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printf(usage_format,
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// where
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"file", "The input model file to load.",
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// options
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COMMAND_USAGE, "Display usage.");
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}
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/* the global Assimp scene object */
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const C_STRUCT aiScene* scene = NULL;
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GLuint scene_list = 0;
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C_STRUCT aiVector3D scene_min, scene_max, scene_center;
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/* current rotation angle */
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static float angle = 0.f;
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#define aisgl_min(x,y) (x<y?x:y)
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#define aisgl_max(x,y) (y>x?y:x)
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/* ---------------------------------------------------------------------------- */
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void reshape(int width, int height)
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{
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const double aspectRatio = (float) width / height, fieldOfView = 45.0;
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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gluPerspective(fieldOfView, aspectRatio,
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1.0, 1000.0); /* Znear and Zfar */
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glViewport(0, 0, width, height);
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}
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/* ---------------------------------------------------------------------------- */
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void get_bounding_box_for_node (const C_STRUCT aiNode* nd,
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C_STRUCT aiVector3D* min,
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C_STRUCT aiVector3D* max,
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C_STRUCT aiMatrix4x4* trafo
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){
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C_STRUCT aiMatrix4x4 prev;
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unsigned int n = 0, t;
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prev = *trafo;
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aiMultiplyMatrix4(trafo,&nd->mTransformation);
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for (; n < nd->mNumMeshes; ++n) {
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const C_STRUCT aiMesh* mesh = scene->mMeshes[nd->mMeshes[n]];
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for (t = 0; t < mesh->mNumVertices; ++t) {
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C_STRUCT aiVector3D tmp = mesh->mVertices[t];
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aiTransformVecByMatrix4(&tmp,trafo);
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min->x = aisgl_min(min->x,tmp.x);
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min->y = aisgl_min(min->y,tmp.y);
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min->z = aisgl_min(min->z,tmp.z);
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max->x = aisgl_max(max->x,tmp.x);
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max->y = aisgl_max(max->y,tmp.y);
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max->z = aisgl_max(max->z,tmp.z);
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}
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}
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for (n = 0; n < nd->mNumChildren; ++n) {
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get_bounding_box_for_node(nd->mChildren[n],min,max,trafo);
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}
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*trafo = prev;
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}
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/* ---------------------------------------------------------------------------- */
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void get_bounding_box(C_STRUCT aiVector3D* min, C_STRUCT aiVector3D* max)
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{
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C_STRUCT aiMatrix4x4 trafo;
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aiIdentityMatrix4(&trafo);
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min->x = min->y = min->z = 1e10f;
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max->x = max->y = max->z = -1e10f;
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get_bounding_box_for_node(scene->mRootNode,min,max,&trafo);
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}
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/* ---------------------------------------------------------------------------- */
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void color4_to_float4(const C_STRUCT aiColor4D *c, float f[4])
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{
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f[0] = c->r;
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f[1] = c->g;
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f[2] = c->b;
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f[3] = c->a;
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}
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/* ---------------------------------------------------------------------------- */
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void set_float4(float f[4], float a, float b, float c, float d)
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{
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f[0] = a;
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f[1] = b;
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f[2] = c;
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f[3] = d;
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}
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/* ---------------------------------------------------------------------------- */
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void apply_material(const C_STRUCT aiMaterial *mtl)
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{
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float c[4];
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GLenum fill_mode;
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int ret1, ret2;
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C_STRUCT aiColor4D diffuse;
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C_STRUCT aiColor4D specular;
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C_STRUCT aiColor4D ambient;
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C_STRUCT aiColor4D emission;
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ai_real shininess, strength;
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int two_sided;
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int wireframe;
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unsigned int max;
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set_float4(c, 0.8f, 0.8f, 0.8f, 1.0f);
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if(AI_SUCCESS == aiGetMaterialColor(mtl, AI_MATKEY_COLOR_DIFFUSE, &diffuse))
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color4_to_float4(&diffuse, c);
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glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, c);
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set_float4(c, 0.0f, 0.0f, 0.0f, 1.0f);
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if(AI_SUCCESS == aiGetMaterialColor(mtl, AI_MATKEY_COLOR_SPECULAR, &specular))
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color4_to_float4(&specular, c);
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glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, c);
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set_float4(c, 0.2f, 0.2f, 0.2f, 1.0f);
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if(AI_SUCCESS == aiGetMaterialColor(mtl, AI_MATKEY_COLOR_AMBIENT, &ambient))
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color4_to_float4(&ambient, c);
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glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, c);
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set_float4(c, 0.0f, 0.0f, 0.0f, 1.0f);
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if(AI_SUCCESS == aiGetMaterialColor(mtl, AI_MATKEY_COLOR_EMISSIVE, &emission))
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color4_to_float4(&emission, c);
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glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, c);
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max = 1;
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ret1 = aiGetMaterialFloatArray(mtl, AI_MATKEY_SHININESS, &shininess, &max);
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if(ret1 == AI_SUCCESS) {
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max = 1;
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ret2 = aiGetMaterialFloatArray(mtl, AI_MATKEY_SHININESS_STRENGTH, &strength, &max);
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if(ret2 == AI_SUCCESS)
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glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, shininess * strength);
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else
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glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, shininess);
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}
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else {
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glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, 0.0f);
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set_float4(c, 0.0f, 0.0f, 0.0f, 0.0f);
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glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, c);
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}
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max = 1;
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if(AI_SUCCESS == aiGetMaterialIntegerArray(mtl, AI_MATKEY_ENABLE_WIREFRAME, &wireframe, &max))
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fill_mode = wireframe ? GL_LINE : GL_FILL;
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else
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fill_mode = GL_FILL;
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glPolygonMode(GL_FRONT_AND_BACK, fill_mode);
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max = 1;
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if((AI_SUCCESS == aiGetMaterialIntegerArray(mtl, AI_MATKEY_TWOSIDED, &two_sided, &max)) && two_sided)
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glDisable(GL_CULL_FACE);
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else
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glEnable(GL_CULL_FACE);
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}
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/* ---------------------------------------------------------------------------- */
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void recursive_render (const C_STRUCT aiScene *sc, const C_STRUCT aiNode* nd)
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{
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unsigned int i;
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unsigned int n = 0, t;
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C_STRUCT aiMatrix4x4 m = nd->mTransformation;
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/* update transform */
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aiTransposeMatrix4(&m);
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glPushMatrix();
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glMultMatrixf((float*)&m);
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/* draw all meshes assigned to this node */
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for (; n < nd->mNumMeshes; ++n) {
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const C_STRUCT aiMesh* mesh = scene->mMeshes[nd->mMeshes[n]];
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apply_material(sc->mMaterials[mesh->mMaterialIndex]);
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if(mesh->mNormals == NULL) {
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glDisable(GL_LIGHTING);
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} else {
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glEnable(GL_LIGHTING);
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}
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for (t = 0; t < mesh->mNumFaces; ++t) {
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const C_STRUCT aiFace* face = &mesh->mFaces[t];
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GLenum face_mode;
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switch(face->mNumIndices) {
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case 1: face_mode = GL_POINTS; break;
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case 2: face_mode = GL_LINES; break;
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case 3: face_mode = GL_TRIANGLES; break;
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default: face_mode = GL_POLYGON; break;
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}
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glBegin(face_mode);
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for(i = 0; i < face->mNumIndices; i++) {
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int index = face->mIndices[i];
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if(mesh->mColors[0] != NULL)
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glColor4fv((GLfloat*)&mesh->mColors[0][index]);
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if(mesh->mNormals != NULL)
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glNormal3fv(&mesh->mNormals[index].x);
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glVertex3fv(&mesh->mVertices[index].x);
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}
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glEnd();
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}
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}
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/* draw all children */
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for (n = 0; n < nd->mNumChildren; ++n) {
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recursive_render(sc, nd->mChildren[n]);
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}
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glPopMatrix();
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}
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/* ---------------------------------------------------------------------------- */
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void do_motion (void)
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{
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static GLint prev_time = 0;
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static GLint prev_fps_time = 0;
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static int frames = 0;
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int time = glutGet(GLUT_ELAPSED_TIME);
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angle += static_cast<float>((time-prev_time)*0.01);
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prev_time = time;
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frames += 1;
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if ((time - prev_fps_time) > 1000) /* update every seconds */
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{
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int current_fps = frames * 1000 / (time - prev_fps_time);
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printf("%d fps\n", current_fps);
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frames = 0;
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prev_fps_time = time;
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}
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glutPostRedisplay ();
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}
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/* ---------------------------------------------------------------------------- */
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void display(void)
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{
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float tmp;
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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gluLookAt(0.f,0.f,3.f,0.f,0.f,-5.f,0.f,1.f,0.f);
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/* rotate it around the y axis */
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glRotatef(angle,0.f,1.f,0.f);
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/* scale the whole asset to fit into our view frustum */
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tmp = scene_max.x-scene_min.x;
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tmp = aisgl_max(scene_max.y - scene_min.y,tmp);
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tmp = aisgl_max(scene_max.z - scene_min.z,tmp);
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tmp = 1.f / tmp;
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glScalef(tmp, tmp, tmp);
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/* center the model */
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glTranslatef( -scene_center.x, -scene_center.y, -scene_center.z );
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/* if the display list has not been made yet, create a new one and
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fill it with scene contents */
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if(scene_list == 0) {
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scene_list = glGenLists(1);
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glNewList(scene_list, GL_COMPILE);
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/* now begin at the root node of the imported data and traverse
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the scenegraph by multiplying subsequent local transforms
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together on GL's matrix stack. */
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recursive_render(scene, scene->mRootNode);
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glEndList();
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}
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glCallList(scene_list);
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glutSwapBuffers();
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do_motion();
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}
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/* ---------------------------------------------------------------------------- */
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int loadasset (const char* path)
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{
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/* we are taking one of the postprocessing presets to avoid
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spelling out 20+ single postprocessing flags here. */
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scene = aiImportFile(path,aiProcessPreset_TargetRealtime_MaxQuality);
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if (scene) {
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get_bounding_box(&scene_min,&scene_max);
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scene_center.x = (scene_min.x + scene_max.x) / 2.0f;
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scene_center.y = (scene_min.y + scene_max.y) / 2.0f;
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scene_center.z = (scene_min.z + scene_max.z) / 2.0f;
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return 0;
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}
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return 1;
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}
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/* ---------------------------------------------------------------------------- */
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int main(int argc, char **argv)
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{
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const char* model_file = NULL;
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C_STRUCT aiLogStream stream;
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if (argc < 2) {
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print_error("No input model file specifed.");
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print_run_command(COMMAND_USAGE);
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return EXIT_FAILURE;
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}
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// Find and execute available commands entered by the user.
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for (int i = 1; i < argc; ++i) {
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if (!strncmp(argv[i], COMMAND_USAGE, strlen(COMMAND_USAGE))) {
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print_usage();
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return EXIT_SUCCESS;
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}
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}
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// Check and validate the specified model file extension.
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model_file = argv[1];
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const char* extension = strchr(model_file, '.');
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if (!extension) {
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print_error("Please provide a file with a valid extension.");
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return EXIT_FAILURE;
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}
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if (AI_FALSE == aiIsExtensionSupported(extension)) {
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print_error("The specified model file extension is currently "
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"unsupported in Assimp " ASSIMP_VERSION ".");
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return EXIT_FAILURE;
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}
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glutInitWindowSize(900,600);
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glutInitWindowPosition(100,100);
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glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
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glutInit(&argc, argv);
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glutSetOption(GLUT_ACTION_ON_WINDOW_CLOSE, GLUT_ACTION_GLUTMAINLOOP_RETURNS);
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glutCreateWindow("Assimp - Very simple OpenGL sample");
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glutDisplayFunc(display);
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glutReshapeFunc(reshape);
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/* get a handle to the predefined STDOUT log stream and attach
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it to the logging system. It remains active for all further
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calls to aiImportFile(Ex) and aiApplyPostProcessing. */
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stream = aiGetPredefinedLogStream(aiDefaultLogStream_STDOUT,NULL);
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aiAttachLogStream(&stream);
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/* ... same procedure, but this stream now writes the
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log messages to assimp_log.txt */
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stream = aiGetPredefinedLogStream(aiDefaultLogStream_FILE,"assimp_log.txt");
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aiAttachLogStream(&stream);
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// Load the model file.
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if(0 != loadasset(model_file)) {
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print_error("Failed to load model. Please ensure that the specified file exists.");
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aiDetachAllLogStreams();
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return EXIT_FAILURE;
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}
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glClearColor(0.1f,0.1f,0.1f,1.f);
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glEnable(GL_LIGHTING);
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glEnable(GL_LIGHT0); /* Uses default lighting parameters */
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glEnable(GL_DEPTH_TEST);
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glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE);
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glEnable(GL_NORMALIZE);
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/* XXX docs say all polygons are emitted CCW, but tests show that some aren't. */
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if(getenv("MODEL_IS_BROKEN"))
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glFrontFace(GL_CW);
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glColorMaterial(GL_FRONT_AND_BACK, GL_DIFFUSE);
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glutGet(GLUT_ELAPSED_TIME);
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glutMainLoop();
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/* cleanup - calling 'aiReleaseImport' is important, as the library
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keeps internal resources until the scene is freed again. Not
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doing so can cause severe resource leaking. */
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aiReleaseImport(scene);
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/* We added a log stream to the library, it's our job to disable it
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again. This will definitely release the last resources allocated
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by Assimp.*/
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aiDetachAllLogStreams();
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return EXIT_SUCCESS;
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}
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