* Adjustment: Initial CMake reworking.

Engine/lib/assimp/samples/SimpleOpenGL/Sample_SimpleOpenGL.c

@@ -0,0 +1,448 @@
+/* ----------------------------------------------------------------------------
+// Simple sample to prove that Assimp is easy to use with OpenGL.
+// It takes a file name as command line parameter, loads it using standard
+// settings and displays it.
+//
+// If you intend to _use_ this code sample in your app, do yourself a favour
+// and replace immediate mode calls with VBOs ...
+//
+// The vc8 solution links against assimp-release-dll_win32 - be sure to
+// have this configuration built.
+// ----------------------------------------------------------------------------
+*/
+
+#include <stdlib.h>
+#include <stdio.h>
+
+#ifdef __APPLE__
+#include <freeglut.h>
+#else
+#include <GL/freeglut.h>
+#endif
+
+/* assimp include files. These three are usually needed. */
+#include <assimp/cimport.h>
+#include <assimp/scene.h>
+#include <assimp/postprocess.h>
+
+#define COMMAND_USAGE "--usage"
+
+/* ---------------------------------------------------------------------------- */
+inline static void print_run_command(const char* command_name) {
+	printf("Run '%s %s' for more information.\n",
+		PROJECT_NAME, command_name);
+}
+
+/* ---------------------------------------------------------------------------- */
+inline static void print_error(const char* msg) {
+	printf("ERROR: %s\n", msg);
+}
+
+#define NEW_LINE "\n"
+#define DOUBLE_NEW_LINE NEW_LINE NEW_LINE
+
+/* ---------------------------------------------------------------------------- */
+inline static void print_usage() {
+	static const char* usage_format =
+		"Usage: "
+		PROJECT_NAME
+		" <file>"	 DOUBLE_NEW_LINE
+		"where:"	 DOUBLE_NEW_LINE
+		"  %-10s %s" DOUBLE_NEW_LINE
+		"options:"	 DOUBLE_NEW_LINE
+		"  %-10s %s" DOUBLE_NEW_LINE;
+	printf(usage_format,
+		// where
+		"file", "The input model file to load.",
+		// options
+		COMMAND_USAGE, "Display usage.");
+}
+
+/* the global Assimp scene object */
+const C_STRUCT aiScene* scene = NULL;
+GLuint scene_list = 0;
+C_STRUCT aiVector3D scene_min, scene_max, scene_center;
+
+/* current rotation angle */
+static float angle = 0.f;
+
+#define aisgl_min(x,y) (x<y?x:y)
+#define aisgl_max(x,y) (y>x?y:x)
+
+/* ---------------------------------------------------------------------------- */
+void reshape(int width, int height)
+{
+	const double aspectRatio = (float) width / height, fieldOfView = 45.0;
+
+	glMatrixMode(GL_PROJECTION);
+	glLoadIdentity();
+	gluPerspective(fieldOfView, aspectRatio,
+		1.0, 1000.0);  /* Znear and Zfar */
+	glViewport(0, 0, width, height);
+}
+
+/* ---------------------------------------------------------------------------- */
+void get_bounding_box_for_node (const C_STRUCT aiNode* nd,
+	C_STRUCT aiVector3D* min,
+	C_STRUCT aiVector3D* max,
+	C_STRUCT aiMatrix4x4* trafo
+){
+	C_STRUCT aiMatrix4x4 prev;
+	unsigned int n = 0, t;
+
+	prev = *trafo;
+	aiMultiplyMatrix4(trafo,&nd->mTransformation);
+
+	for (; n < nd->mNumMeshes; ++n) {
+		const C_STRUCT aiMesh* mesh = scene->mMeshes[nd->mMeshes[n]];
+		for (t = 0; t < mesh->mNumVertices; ++t) {
+
+			C_STRUCT aiVector3D tmp = mesh->mVertices[t];
+			aiTransformVecByMatrix4(&tmp,trafo);
+
+			min->x = aisgl_min(min->x,tmp.x);
+			min->y = aisgl_min(min->y,tmp.y);
+			min->z = aisgl_min(min->z,tmp.z);
+
+			max->x = aisgl_max(max->x,tmp.x);
+			max->y = aisgl_max(max->y,tmp.y);
+			max->z = aisgl_max(max->z,tmp.z);
+		}
+	}
+
+	for (n = 0; n < nd->mNumChildren; ++n) {
+		get_bounding_box_for_node(nd->mChildren[n],min,max,trafo);
+	}
+	*trafo = prev;
+}
+
+/* ---------------------------------------------------------------------------- */
+void get_bounding_box(C_STRUCT aiVector3D* min, C_STRUCT aiVector3D* max)
+{
+	C_STRUCT aiMatrix4x4 trafo;
+	aiIdentityMatrix4(&trafo);
+
+	min->x = min->y = min->z =  1e10f;
+	max->x = max->y = max->z = -1e10f;
+	get_bounding_box_for_node(scene->mRootNode,min,max,&trafo);
+}
+
+/* ---------------------------------------------------------------------------- */
+void color4_to_float4(const C_STRUCT aiColor4D *c, float f[4])
+{
+	f[0] = c->r;
+	f[1] = c->g;
+	f[2] = c->b;
+	f[3] = c->a;
+}
+
+/* ---------------------------------------------------------------------------- */
+void set_float4(float f[4], float a, float b, float c, float d)
+{
+	f[0] = a;
+	f[1] = b;
+	f[2] = c;
+	f[3] = d;
+}
+
+/* ---------------------------------------------------------------------------- */
+void apply_material(const C_STRUCT aiMaterial *mtl)
+{
+	float c[4];
+
+	GLenum fill_mode;
+	int ret1, ret2;
+	C_STRUCT aiColor4D diffuse;
+	C_STRUCT aiColor4D specular;
+	C_STRUCT aiColor4D ambient;
+	C_STRUCT aiColor4D emission;
+	ai_real shininess, strength;
+	int two_sided;
+	int wireframe;
+	unsigned int max;
+
+	set_float4(c, 0.8f, 0.8f, 0.8f, 1.0f);
+	if(AI_SUCCESS == aiGetMaterialColor(mtl, AI_MATKEY_COLOR_DIFFUSE, &diffuse))
+		color4_to_float4(&diffuse, c);
+	glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, c);
+
+	set_float4(c, 0.0f, 0.0f, 0.0f, 1.0f);
+	if(AI_SUCCESS == aiGetMaterialColor(mtl, AI_MATKEY_COLOR_SPECULAR, &specular))
+		color4_to_float4(&specular, c);
+	glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, c);
+
+	set_float4(c, 0.2f, 0.2f, 0.2f, 1.0f);
+	if(AI_SUCCESS == aiGetMaterialColor(mtl, AI_MATKEY_COLOR_AMBIENT, &ambient))
+		color4_to_float4(&ambient, c);
+	glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, c);
+
+	set_float4(c, 0.0f, 0.0f, 0.0f, 1.0f);
+	if(AI_SUCCESS == aiGetMaterialColor(mtl, AI_MATKEY_COLOR_EMISSIVE, &emission))
+		color4_to_float4(&emission, c);
+	glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, c);
+
+	max = 1;
+	ret1 = aiGetMaterialFloatArray(mtl, AI_MATKEY_SHININESS, &shininess, &max);
+	if(ret1 == AI_SUCCESS) {
+    	max = 1;
+    	ret2 = aiGetMaterialFloatArray(mtl, AI_MATKEY_SHININESS_STRENGTH, &strength, &max);
+		if(ret2 == AI_SUCCESS)
+			glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, shininess * strength);
+        else
+        	glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, shininess);
+    }
+	else {
+		glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, 0.0f);
+		set_float4(c, 0.0f, 0.0f, 0.0f, 0.0f);
+		glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, c);
+	}
+
+	max = 1;
+	if(AI_SUCCESS == aiGetMaterialIntegerArray(mtl, AI_MATKEY_ENABLE_WIREFRAME, &wireframe, &max))
+		fill_mode = wireframe ? GL_LINE : GL_FILL;
+	else
+		fill_mode = GL_FILL;
+	glPolygonMode(GL_FRONT_AND_BACK, fill_mode);
+
+	max = 1;
+	if((AI_SUCCESS == aiGetMaterialIntegerArray(mtl, AI_MATKEY_TWOSIDED, &two_sided, &max)) && two_sided)
+		glDisable(GL_CULL_FACE);
+	else
+		glEnable(GL_CULL_FACE);
+}
+
+/* ---------------------------------------------------------------------------- */
+void recursive_render (const C_STRUCT aiScene *sc, const C_STRUCT aiNode* nd)
+{
+	unsigned int i;
+	unsigned int n = 0, t;
+	C_STRUCT aiMatrix4x4 m = nd->mTransformation;
+
+	/* update transform */
+	aiTransposeMatrix4(&m);
+	glPushMatrix();
+	glMultMatrixf((float*)&m);
+
+	/* draw all meshes assigned to this node */
+	for (; n < nd->mNumMeshes; ++n) {
+		const C_STRUCT aiMesh* mesh = scene->mMeshes[nd->mMeshes[n]];
+
+		apply_material(sc->mMaterials[mesh->mMaterialIndex]);
+
+		if(mesh->mNormals == NULL) {
+			glDisable(GL_LIGHTING);
+		} else {
+			glEnable(GL_LIGHTING);
+		}
+
+		for (t = 0; t < mesh->mNumFaces; ++t) {
+			const C_STRUCT aiFace* face = &mesh->mFaces[t];
+			GLenum face_mode;
+
+			switch(face->mNumIndices) {
+				case 1: face_mode = GL_POINTS; break;
+				case 2: face_mode = GL_LINES; break;
+				case 3: face_mode = GL_TRIANGLES; break;
+				default: face_mode = GL_POLYGON; break;
+			}
+
+			glBegin(face_mode);
+
+			for(i = 0; i < face->mNumIndices; i++) {
+				int index = face->mIndices[i];
+				if(mesh->mColors[0] != NULL)
+					glColor4fv((GLfloat*)&mesh->mColors[0][index]);
+				if(mesh->mNormals != NULL)
+					glNormal3fv(&mesh->mNormals[index].x);
+				glVertex3fv(&mesh->mVertices[index].x);
+			}
+
+			glEnd();
+		}
+
+	}
+
+	/* draw all children */
+	for (n = 0; n < nd->mNumChildren; ++n) {
+		recursive_render(sc, nd->mChildren[n]);
+	}
+
+	glPopMatrix();
+}
+
+/* ---------------------------------------------------------------------------- */
+void do_motion (void)
+{
+	static GLint prev_time = 0;
+	static GLint prev_fps_time = 0;
+	static int frames = 0;
+
+	int time = glutGet(GLUT_ELAPSED_TIME);
+	angle += (float)((time-prev_time)*0.01);
+	prev_time = time;
+
+	frames += 1;
+	if ((time - prev_fps_time) > 1000) /* update every seconds */
+    {
+        int current_fps = frames * 1000 / (time - prev_fps_time);
+        printf("%d fps\n", current_fps);
+        frames = 0;
+        prev_fps_time = time;
+    }
+
+
+	glutPostRedisplay ();
+}
+
+/* ---------------------------------------------------------------------------- */
+void display(void)
+{
+	float tmp;
+
+	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+	glMatrixMode(GL_MODELVIEW);
+	glLoadIdentity();
+	gluLookAt(0.f,0.f,3.f,0.f,0.f,-5.f,0.f,1.f,0.f);
+
+	/* rotate it around the y axis */
+	glRotatef(angle,0.f,1.f,0.f);
+
+	/* scale the whole asset to fit into our view frustum */
+	tmp = scene_max.x-scene_min.x;
+	tmp = aisgl_max(scene_max.y - scene_min.y,tmp);
+	tmp = aisgl_max(scene_max.z - scene_min.z,tmp);
+	tmp = 1.f / tmp;
+	glScalef(tmp, tmp, tmp);
+
+        /* center the model */
+	glTranslatef( -scene_center.x, -scene_center.y, -scene_center.z );
+
+        /* if the display list has not been made yet, create a new one and
+           fill it with scene contents */
+	if(scene_list == 0) {
+	    scene_list = glGenLists(1);
+	    glNewList(scene_list, GL_COMPILE);
+            /* now begin at the root node of the imported data and traverse
+               the scenegraph by multiplying subsequent local transforms
+               together on GL's matrix stack. */
+	    recursive_render(scene, scene->mRootNode);
+	    glEndList();
+	}
+
+	glCallList(scene_list);
+
+	glutSwapBuffers();
+
+	do_motion();
+}
+
+/* ---------------------------------------------------------------------------- */
+int loadasset (const char* path)
+{
+	/* we are taking one of the postprocessing presets to avoid
+	   spelling out 20+ single postprocessing flags here. */
+	scene = aiImportFile(path,aiProcessPreset_TargetRealtime_MaxQuality);
+
+	if (scene) {
+		get_bounding_box(&scene_min,&scene_max);
+		scene_center.x = (scene_min.x + scene_max.x) / 2.0f;
+		scene_center.y = (scene_min.y + scene_max.y) / 2.0f;
+		scene_center.z = (scene_min.z + scene_max.z) / 2.0f;
+		return 0;
+	}
+	return 1;
+}
+
+/* ---------------------------------------------------------------------------- */
+int main(int argc, char **argv)
+{
+	const char* model_file = NULL;
+	C_STRUCT aiLogStream stream;
+
+	if (argc < 2) {
+		print_error("No input model file specified.");
+		print_run_command(COMMAND_USAGE);
+		return EXIT_FAILURE;
+	}
+
+	// Find and execute available commands entered by the user.
+	for (int i = 1; i < argc; ++i) {
+		if (!strncmp(argv[i], COMMAND_USAGE, strlen(COMMAND_USAGE))) {
+			print_usage();
+			return EXIT_SUCCESS;
+		}
+	}
+
+	// Check and validate the specified model file extension.
+	model_file = argv[1];
+	const char* extension = strrchr(model_file, '.');
+	if (!extension) {
+		print_error("Please provide a file with a valid extension.");
+		return EXIT_FAILURE;
+	}
+
+	if (AI_FALSE == aiIsExtensionSupported(extension)) {
+		print_error("The specified model file extension is currently "
+			"unsupported in Assimp " ASSIMP_VERSION ".");
+		return EXIT_FAILURE;
+	}
+
+	glutInitWindowSize(900,600);
+	glutInitWindowPosition(100,100);
+	glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
+	glutInit(&argc, argv);
+	glutSetOption(GLUT_ACTION_ON_WINDOW_CLOSE, GLUT_ACTION_GLUTMAINLOOP_RETURNS);
+
+	glutCreateWindow("Assimp - Very simple OpenGL sample");
+	glutDisplayFunc(display);
+	glutReshapeFunc(reshape);
+
+	/* get a handle to the predefined STDOUT log stream and attach
+	   it to the logging system. It remains active for all further
+	   calls to aiImportFile(Ex) and aiApplyPostProcessing. */
+	stream = aiGetPredefinedLogStream(aiDefaultLogStream_STDOUT,NULL);
+	aiAttachLogStream(&stream);
+
+	/* ... same procedure, but this stream now writes the
+	   log messages to assimp_log.txt */
+	stream = aiGetPredefinedLogStream(aiDefaultLogStream_FILE,"assimp_log.txt");
+	aiAttachLogStream(&stream);
+
+	// Load the model file.
+	if(0 != loadasset(model_file)) {
+		print_error("Failed to load model. Please ensure that the specified file exists.");
+		aiDetachAllLogStreams();
+		return EXIT_FAILURE;
+	}
+
+	glClearColor(0.1f,0.1f,0.1f,1.f);
+
+	glEnable(GL_LIGHTING);
+	glEnable(GL_LIGHT0);    /* Uses default lighting parameters */
+
+	glEnable(GL_DEPTH_TEST);
+
+	glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE);
+	glEnable(GL_NORMALIZE);
+
+	/* XXX docs say all polygons are emitted CCW, but tests show that some aren't. */
+	if(getenv("MODEL_IS_BROKEN"))
+		glFrontFace(GL_CW);
+
+	glColorMaterial(GL_FRONT_AND_BACK, GL_DIFFUSE);
+
+	glutGet(GLUT_ELAPSED_TIME);
+	glutMainLoop();
+
+	/* cleanup - calling 'aiReleaseImport' is important, as the library
+	   keeps internal resources until the scene is freed again. Not
+	   doing so can cause severe resource leaking. */
+	aiReleaseImport(scene);
+
+	/* We added a log stream to the library, it's our job to disable it
+	   again. This will definitely release the last resources allocated
+	   by Assimp.*/
+	aiDetachAllLogStreams();
+	return EXIT_SUCCESS;
+}