84 lines
2.5 KiB
C++
84 lines
2.5 KiB
C++
#include "vertexbuffer.h"
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#include <cassert>
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#include <climits>
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VertexBuffer::VertexBuffer() : m_isValid(false) {
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}
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VertexBuffer::~VertexBuffer() {
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if(m_isValid) {
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glDeleteBuffers(1, &m_vertexVboId);
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glDeleteBuffers(1, &m_indexVboId);
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}
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}
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bool VertexBuffer::IsValid() const {
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return m_isValid;
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}
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void VertexBuffer::SetMeshData(VertexData* vd, int vertexCount) {
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assert(vertexCount <= USHRT_MAX);
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if(vertexCount == 0)
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return;
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if(!m_isValid) {
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glGenBuffers(1, &m_vertexVboId);
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glGenBuffers(1, &m_indexVboId);
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}
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m_vertexCount = vertexCount;
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glBindBuffer(GL_ARRAY_BUFFER, m_vertexVboId);
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glBufferData(GL_ARRAY_BUFFER, sizeof(VertexData) * vertexCount, vd, GL_STATIC_DRAW);
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// Pour le moment, generer le index array pour inclure tout les vertex, sans
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// optimisation pour reduire le nombre de vertex envoyes a la carte
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// Idealement cet array devrait etre utiliser pour reutiliser les vertex et ainsi
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// sauver du temps en envoyant moins de donnees a la carte (il devrait etre construit
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// en meme temps que le buffer vd est rempli..)
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uint16_t* idx = new uint16_t[vertexCount];
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for(int i = 0; i < vertexCount; ++i)
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idx[i] = i;
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_indexVboId);
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glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(uint16_t) * vertexCount, idx, GL_STATIC_DRAW);
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delete [] idx;
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m_isValid = true;
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}
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void VertexBuffer::Render() const {
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if(IsValid())
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{
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glClientActiveTexture(GL_TEXTURE0);
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glBindBuffer(GL_ARRAY_BUFFER, m_vertexVboId);
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glEnableClientState(GL_VERTEX_ARRAY);
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glVertexPointer(3, GL_FLOAT, sizeof(VertexData), (char*)0);
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glEnableClientState(GL_COLOR_ARRAY);
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glColorPointer(3, GL_FLOAT, sizeof(VertexData), (char*)12);
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glEnableClientState(GL_TEXTURE_COORD_ARRAY);
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glTexCoordPointer(2, GL_FLOAT, sizeof(VertexData), (char*)24);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_indexVboId);
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glDrawElements(GL_QUADS, m_vertexCount, GL_UNSIGNED_SHORT, (char*)0);
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// TODO
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//glDrawRangeElements(GL_TRIANGLES, 0, 3, 3, GL_UNSIGNED_SHORT, (char*)0);
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glDisableClientState(GL_VERTEX_ARRAY);
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glDisableClientState(GL_COLOR_ARRAY);
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glDisableClientState(GL_TEXTURE_COORD_ARRAY);
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}
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}
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int VertexBuffer::Count() const {
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return m_vertexCount;
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}
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void VertexBuffer::Flush() {
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if (m_isValid) {
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glDeleteBuffers(1, &m_vertexVboId);
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glDeleteBuffers(1, &m_indexVboId);
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}
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m_isValid = false;
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}
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