eqemu

annotate src/mesh.cc @ 3:f9274bebe55e

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adding 3d graphics stuff
author John Tsiombikas <nuclear@member.fsf.org>
date Thu, 17 Jul 2014 02:35:19 +0300
parents
children 3d3656360a82
rev   line source
nuclear@3 1 #include <stdio.h>
nuclear@3 2 #include <string.h>
nuclear@3 3 #include <GL/glew.h>
nuclear@3 4 #include "mesh.h"
nuclear@3 5
nuclear@3 6 #define ALL_VALID 0xffffffff
nuclear@3 7
nuclear@3 8 Mesh::Mesh()
nuclear@3 9 {
nuclear@3 10 buf_valid = ALL_VALID;
nuclear@3 11
nuclear@3 12 for(int i=0; i<vcount; i++) {
nuclear@3 13 attr[i] = 0;
nuclear@3 14 attr_size[i] = 0;
nuclear@3 15 buf_valid &= ~(1 << i);
nuclear@3 16 }
nuclear@3 17 vcount = 0;
nuclear@3 18 glGenBuffers(NUM_MESH_ATTRIBS, vbo);
nuclear@3 19 }
nuclear@3 20
nuclear@3 21 Mesh::~Mesh()
nuclear@3 22 {
nuclear@3 23 for(int i=0; i<vcount; i++) {
nuclear@3 24 delete [] attr[i];
nuclear@3 25 }
nuclear@3 26 glDeleteBuffers(NUM_MESH_ATTRIBS, vbo);
nuclear@3 27 }
nuclear@3 28
nuclear@3 29 float *Mesh::set_attrib(int aidx, int count, int elemsz, float *data)
nuclear@3 30 {
nuclear@3 31 if(attr[aidx]) {
nuclear@3 32 delete [] attr[aidx];
nuclear@3 33 }
nuclear@3 34 attr[aidx] = new float[count * elemsz];
nuclear@3 35 attr_size[aidx] = elemsz;
nuclear@3 36 buf_valid &= ~(1 << aidx);
nuclear@3 37 return attr[aidx];
nuclear@3 38 }
nuclear@3 39
nuclear@3 40 float *Mesh::get_attrib(int aidx)
nuclear@3 41 {
nuclear@3 42 buf_valid &= ~(1 << aidx);
nuclear@3 43 return attr[aidx];
nuclear@3 44 }
nuclear@3 45
nuclear@3 46 const float *Mesh::get_attrib(int aidx) const
nuclear@3 47 {
nuclear@3 48 return attr[aidx];
nuclear@3 49 }
nuclear@3 50
nuclear@3 51 void Mesh::draw() const
nuclear@3 52 {
nuclear@3 53 update_buffers();
nuclear@3 54
nuclear@3 55 if(!vbo[MESH_ATTR_VERTEX]) {
nuclear@3 56 fprintf(stderr, "trying to render without a vertex buffer\n");
nuclear@3 57 return;
nuclear@3 58 }
nuclear@3 59
nuclear@3 60 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_VERTEX]);
nuclear@3 61 glEnableClientState(GL_VERTEX_ARRAY);
nuclear@3 62 glVertexPointer(attr_size[MESH_ATTR_VERTEX], GL_FLOAT, 0, 0);
nuclear@3 63
nuclear@3 64 if(vbo[MESH_ATTR_NORMAL]) {
nuclear@3 65 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_NORMAL]);
nuclear@3 66 glEnableClientState(GL_NORMAL_ARRAY);
nuclear@3 67 glNormalPointer(GL_FLOAT, 0, 0);
nuclear@3 68 }
nuclear@3 69 if(vbo[MESH_ATTR_TEXCOORD]) {
nuclear@3 70 glBindBuffer(GL_ARRAY_BUFFER, vbo[MESH_ATTR_TEXCOORD]);
nuclear@3 71 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
nuclear@3 72 glTexCoordPointer(attr_size[MESH_ATTR_TEXCOORD], GL_FLOAT, 0, 0);
nuclear@3 73 }
nuclear@3 74 glBindBuffer(GL_ARRAY_BUFFER, 0);
nuclear@3 75
nuclear@3 76 glDrawArrays(GL_TRIANGLES, 0, vcount);
nuclear@3 77
nuclear@3 78 glDisableClientState(GL_VERTEX_ARRAY);
nuclear@3 79 if(vbo[MESH_ATTR_NORMAL]) {
nuclear@3 80 glDisableClientState(GL_NORMAL_ARRAY);
nuclear@3 81 }
nuclear@3 82 if(vbo[MESH_ATTR_TEXCOORD]) {
nuclear@3 83 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
nuclear@3 84 }
nuclear@3 85 }
nuclear@3 86
nuclear@3 87 void Mesh::update_buffers() const
nuclear@3 88 {
nuclear@3 89 if(buf_valid == ALL_VALID) {
nuclear@3 90 return;
nuclear@3 91 }
nuclear@3 92
nuclear@3 93 for(int i=0; i<NUM_MESH_ATTRIBS; i++) {
nuclear@3 94 if((buf_valid & (1 << i)) == 0) {
nuclear@3 95 glBindBuffer(GL_ARRAY_BUFFER, vbo[i]);
nuclear@3 96 glBufferData(GL_ARRAY_BUFFER, vcount * attr_size[i] * sizeof(float),
nuclear@3 97 attr[i], GL_STATIC_DRAW);
nuclear@3 98 buf_valid |= 1 << i;
nuclear@3 99 }
nuclear@3 100 }
nuclear@3 101 }