nuclear@3: #include <stdio.h>
nuclear@3: #include <string.h>
nuclear@3: #include <GL/glew.h>
nuclear@3: #include "mesh.h"
nuclear@3: 
nuclear@3: #define ALL_VALID	0xffffffff
nuclear@3: 
nuclear@3: Mesh::Mesh()
nuclear@3: {
nuclear@3: 	buf_valid = ALL_VALID;
nuclear@3: 
nuclear@3: 	for(int i=0; i<vcount; i++) {
nuclear@3: 		attr[i] = 0;
nuclear@3: 		attr_size[i] = 0;
nuclear@3: 		buf_valid &= ~(1 << i);
nuclear@3: 	}
nuclear@3: 	vcount = 0;
nuclear@3: 	glGenBuffers(NUM_MESH_ATTRIBS, vbo);
nuclear@3: }
nuclear@3: 
nuclear@3: Mesh::~Mesh()
nuclear@3: {
nuclear@3: 	for(int i=0; i<vcount; i++) {
nuclear@3: 		delete [] attr[i];
nuclear@3: 	}
nuclear@3: 	glDeleteBuffers(NUM_MESH_ATTRIBS, vbo);
nuclear@3: }
nuclear@3: 
nuclear@3: float *Mesh::set_attrib(int aidx, int count, int elemsz, float *data)
nuclear@3: {
nuclear@3: 	if(attr[aidx]) {
nuclear@3: 		delete [] attr[aidx];
nuclear@3: 	}
nuclear@3: 	attr[aidx] = new float[count * elemsz];
nuclear@3: 	attr_size[aidx] = elemsz;
nuclear@3: 	buf_valid &= ~(1 << aidx);
nuclear@3: 	return attr[aidx];
nuclear@3: }
nuclear@3: 
nuclear@3: float *Mesh::get_attrib(int aidx)
nuclear@3: {
nuclear@3: 	buf_valid &= ~(1 << aidx);
nuclear@3: 	return attr[aidx];
nuclear@3: }
nuclear@3: 
nuclear@3: const float *Mesh::get_attrib(int aidx) const
nuclear@3: {
nuclear@3: 	return attr[aidx];
nuclear@3: }
nuclear@3: 
nuclear@3: void Mesh::draw() const
nuclear@3: {
nuclear@3: 	update_buffers();
nuclear@3: 
nuclear@3: 	if(!vbo[MESH_ATTR_VERTEX]) {
nuclear@3: 		fprintf(stderr, "trying to render without a vertex buffer\n");
nuclear@3: 		return;
nuclear@3: 	}
nuclear@3: 
nuclear@3: 	glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_VERTEX]);
nuclear@3: 	glEnableClientState(GL_VERTEX_ARRAY);
nuclear@3: 	glVertexPointer(attr_size[MESH_ATTR_VERTEX], GL_FLOAT, 0, 0);
nuclear@3: 
nuclear@3: 	if(vbo[MESH_ATTR_NORMAL]) {
nuclear@3: 		glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_NORMAL]);
nuclear@3: 		glEnableClientState(GL_NORMAL_ARRAY);
nuclear@3: 		glNormalPointer(GL_FLOAT, 0, 0);
nuclear@3: 	}
nuclear@3: 	if(vbo[MESH_ATTR_TEXCOORD]) {
nuclear@3: 		glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_TEXCOORD]);
nuclear@3: 		glEnableClientState(GL_TEXTURE_COORD_ARRAY);
nuclear@3: 		glTexCoordPointer(attr_size[MESH_ATTR_TEXCOORD], GL_FLOAT, 0, 0);
nuclear@3: 	}
nuclear@3: 	glBindBuffer(GL_ARRAY_BUFFER, 0);
nuclear@3: 
nuclear@3: 	glDrawArrays(GL_TRIANGLES, 0, vcount);
nuclear@3: 
nuclear@3: 	glDisableClientState(GL_VERTEX_ARRAY);
nuclear@3: 	if(vbo[MESH_ATTR_NORMAL]) {
nuclear@3: 		glDisableClientState(GL_NORMAL_ARRAY);
nuclear@3: 	}
nuclear@3: 	if(vbo[MESH_ATTR_TEXCOORD]) {
nuclear@3: 		glDisableClientState(GL_TEXTURE_COORD_ARRAY);
nuclear@3: 	}
nuclear@3: }
nuclear@3: 
nuclear@3: void Mesh::update_buffers() const
nuclear@3: {
nuclear@3: 	if(buf_valid == ALL_VALID) {
nuclear@3: 		return;
nuclear@3: 	}
nuclear@3: 
nuclear@3: 	for(int i=0; i<NUM_MESH_ATTRIBS; i++) {
nuclear@3: 		if((buf_valid & (1 << i)) == 0) {
nuclear@3: 			glBindBuffer(GL_ARRAY_BUFFER, vbo[i]);
nuclear@3: 			glBufferData(GL_ARRAY_BUFFER, vcount * attr_size[i] * sizeof(float),
nuclear@3: 					attr[i], GL_STATIC_DRAW);
nuclear@3: 			buf_valid |= 1 << i;
nuclear@3: 		}
nuclear@3: 	}
nuclear@3: }