nuclear@10: #include <stdio.h>
nuclear@10: #include <stdlib.h>
nuclear@2: #include "mesh.h"
nuclear@2: #include "opengl.h"
nuclear@2: 
nuclear@10: /*
nuclear@10: #define DBG_NORMALS
nuclear@10: #define NSZ		0.1
nuclear@10: */
nuclear@10: 
nuclear@2: Mesh::Mesh()
nuclear@2: {
nuclear@2: 	nverts = nfaces = 0;
nuclear@2: 	for(int i=0; i<NUM_MESH_ATTR; i++) {
nuclear@2: 		vbo[i] = 0;
nuclear@2: 	}
nuclear@2: 	ibo = 0;
nuclear@2: 	tang_loc = -1;
nuclear@2: }
nuclear@2: 
nuclear@2: Mesh::~Mesh()
nuclear@2: {
nuclear@2: 	destroy();
nuclear@2: }
nuclear@2: 
nuclear@7: void Mesh::set_name(const char *name)
nuclear@7: {
nuclear@7: 	this->name = name;
nuclear@7: }
nuclear@7: 
nuclear@4: const char *Mesh::get_name() const
nuclear@4: {
nuclear@4: 	return name.c_str();
nuclear@4: }
nuclear@4: 
nuclear@2: bool Mesh::create(const aiScene *scn, aiMesh *aim)
nuclear@2: {
nuclear@2: 	if(vbo[MESH_ATTR_VERTEX]) {
nuclear@2: 		destroy();
nuclear@2: 	}
nuclear@2: 
nuclear@5: 	name = aim->mName.data;
nuclear@5: 
nuclear@2: 	nverts = aim->mNumVertices;
nuclear@2: 	nfaces = aim->mNumFaces;
nuclear@2: 
nuclear@2: 	glGenBuffers(1, vbo + MESH_ATTR_VERTEX);
nuclear@2: 	glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_VERTEX]);
nuclear@2: 	glBufferData(GL_ARRAY_BUFFER, nverts * sizeof *aim->mVertices, aim->mVertices, GL_STATIC_DRAW);
nuclear@2: 
nuclear@2: 	if(aim->mNormals) {
nuclear@2: 		glGenBuffers(1, vbo + MESH_ATTR_NORMAL);
nuclear@2: 		glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_NORMAL]);
nuclear@2: 		glBufferData(GL_ARRAY_BUFFER, nverts * sizeof *aim->mNormals, aim->mNormals, GL_STATIC_DRAW);
nuclear@2: 	}
nuclear@2: 	if(aim->mTangents) {
nuclear@2: 		glGenBuffers(1, vbo + MESH_ATTR_TANGENT);
nuclear@2: 		glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_TANGENT]);
nuclear@2: 		glBufferData(GL_ARRAY_BUFFER, nverts * sizeof *aim->mTangents, aim->mTangents, GL_STATIC_DRAW);
nuclear@2: 	}
nuclear@2: 	if(aim->mTextureCoords[0]) {
nuclear@2: 		glGenBuffers(1, vbo + MESH_ATTR_TEXCOORD);
nuclear@2: 		glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_TEXCOORD]);
nuclear@2: 		glBufferData(GL_ARRAY_BUFFER, nverts * sizeof *aim->mTextureCoords[0], aim->mTextureCoords[0], GL_STATIC_DRAW);
nuclear@2: 	}
nuclear@2: 
nuclear@2: 	glGenBuffers(1, &ibo);
nuclear@2: 	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ibo);
nuclear@2: 	glBufferData(GL_ELEMENT_ARRAY_BUFFER, nfaces * 3 * sizeof *aim->mFaces[0].mIndices, 0, GL_STATIC_DRAW);
nuclear@2: 
nuclear@2: 	/* map the buffer and fill it up */
nuclear@2: 	unsigned int *iptr = (unsigned int*)glMapBuffer(GL_ELEMENT_ARRAY_BUFFER, GL_WRITE_ONLY);
nuclear@2: 
nuclear@4: 	for(int i=0; i<(int)nfaces; i++) {
nuclear@2: 		for(int j=0; j<3; j++) {
nuclear@2: 			*iptr++ = aim->mFaces[i].mIndices[j];
nuclear@2: 		}
nuclear@2: 	}
nuclear@2: 	glUnmapBuffer(GL_ELEMENT_ARRAY_BUFFER);
nuclear@2: 	return true;
nuclear@2: }
nuclear@2: 
nuclear@2: void Mesh::destroy()
nuclear@2: {
nuclear@2: 	for(int i=0; i<NUM_MESH_ATTR; i++) {
nuclear@2: 		if(vbo[i]) {
nuclear@2: 			glDeleteBuffers(1, vbo + i);
nuclear@2: 			vbo[i] = 0;
nuclear@2: 		}
nuclear@2: 	}
nuclear@2: 	glDeleteBuffers(1, &ibo);
nuclear@2: 	ibo = 0;
nuclear@2: 
nuclear@2: 	nverts = nfaces = 0;
nuclear@2: 	tang_loc = -1;
nuclear@2: }
nuclear@2: 
nuclear@7: void Mesh::set_xform(const Matrix4x4 &mat)
nuclear@7: {
nuclear@7: 	xform = mat;
nuclear@7: }
nuclear@7: 
nuclear@7: const Matrix4x4 &Mesh::get_xform() const
nuclear@7: {
nuclear@7: 	return xform;
nuclear@7: }
nuclear@7: 
nuclear@2: void Mesh::set_attrib_location(int attr, int loc)
nuclear@2: {
nuclear@2: 	if(attr == MESH_ATTR_TANGENT) {
nuclear@2: 		tang_loc = loc;
nuclear@2: 	}
nuclear@2: }
nuclear@2: 
nuclear@2: int Mesh::get_attrib_location(int attr) const
nuclear@2: {
nuclear@2: 	return tang_loc;
nuclear@2: }
nuclear@2: 
nuclear@2: void Mesh::draw() const
nuclear@2: {
nuclear@7: 	glMatrixMode(GL_MODELVIEW);
nuclear@7: 	glPushMatrix();
nuclear@7: 	mult_matrix(xform);
nuclear@7: 
nuclear@2: 	glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_VERTEX]);
nuclear@2: 	glVertexPointer(3, GL_FLOAT, 0, 0);
nuclear@2: 	glEnableClientState(GL_VERTEX_ARRAY);
nuclear@2: 
nuclear@2: 	if(vbo[MESH_ATTR_NORMAL]) {
nuclear@2: 		glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_NORMAL]);
nuclear@2: 		glNormalPointer(GL_FLOAT, 0, 0);
nuclear@2: 		glEnableClientState(GL_NORMAL_ARRAY);
nuclear@2: 	}
nuclear@2: 	if(vbo[MESH_ATTR_TANGENT] && tang_loc >= 0) {
nuclear@2: 		glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_TANGENT]);
nuclear@2: 		glVertexAttribPointer(tang_loc, 3, GL_FLOAT, GL_FALSE, 0, 0);
nuclear@2: 		glEnableVertexAttribArray(tang_loc);
nuclear@2: 	}
nuclear@2: 	if(vbo[MESH_ATTR_TEXCOORD]) {
nuclear@2: 		glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_TEXCOORD]);
nuclear@2: 		glTexCoordPointer(3, GL_FLOAT, 0, 0);
nuclear@2: 		glEnableClientState(GL_TEXTURE_COORD_ARRAY);
nuclear@2: 	}
nuclear@2: 
nuclear@2: 	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ibo);
nuclear@2: 	glDrawElements(GL_TRIANGLES, nfaces * 3, GL_UNSIGNED_INT, 0);
nuclear@2: 
nuclear@2: 	glDisableClientState(GL_VERTEX_ARRAY);
nuclear@2: 	glDisableClientState(GL_NORMAL_ARRAY);
nuclear@2: 	glDisableClientState(GL_TEXTURE_COORD_ARRAY);
nuclear@2: 	if(tang_loc >= 0) {
nuclear@2: 		glDisableVertexAttribArray(tang_loc);
nuclear@2: 	}
nuclear@7: 
nuclear@10: #ifdef DBG_NORMALS
nuclear@10: 	glPushAttrib(GL_ENABLE_BIT);
nuclear@10: 	glDisable(GL_LIGHTING);
nuclear@10: 
nuclear@10: 	int prog;
nuclear@10: 	glGetIntegerv(GL_CURRENT_PROGRAM, &prog);
nuclear@10: 	glUseProgram(0);
nuclear@10: 
nuclear@10: 	Vector3 *varr, *narr;
nuclear@10: 
nuclear@10: 	glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_VERTEX]);
nuclear@10: 	varr = (Vector3*)glMapBuffer(GL_ARRAY_BUFFER, GL_READ_ONLY);
nuclear@10: 
nuclear@10: 	glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_NORMAL]);
nuclear@10: 	narr = (Vector3*)glMapBuffer(GL_ARRAY_BUFFER, GL_READ_ONLY);
nuclear@10: 
nuclear@10: 	glBegin(GL_LINES);
nuclear@10: 	for(unsigned int i=0; i<nverts; i++) {
nuclear@10: 		glColor3f(0, 1, 0);
nuclear@10: 		glVertex3f(varr->x, varr->y, varr->z);
nuclear@10: 		glVertex3f(varr->x + narr->x * NSZ, varr->y + narr->y * NSZ, varr->z + narr->z * NSZ);
nuclear@10: 		varr++;
nuclear@10: 		narr++;
nuclear@10: 	}
nuclear@10: 	glEnd();
nuclear@10: 
nuclear@10: 	glUnmapBuffer(GL_ARRAY_BUFFER);
nuclear@10: 	glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_VERTEX]);
nuclear@10: 	glUnmapBuffer(GL_ARRAY_BUFFER);
nuclear@10: 
nuclear@10: 	glUseProgram(prog);
nuclear@10: 	glPopAttrib();
nuclear@10: #endif
nuclear@10: 
nuclear@7: 	glPopMatrix();
nuclear@2: }