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feat: draw instanced

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This commit is contained in:
Amir Adal
2025-10-16 14:06:33 +02:00
parent 282f8e8cb2
commit b991a85b6b
1 changed files with 21 additions and 7 deletions
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26
src/renderer/mesh.cpp
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@ -1,3 +1,5 @@
#include <cstddef>
#include "renderer/mesh.h" #include "renderer/mesh.h"
Mesh::Mesh() { Mesh::Mesh() {
@ -13,13 +15,21 @@ Mesh::Mesh() {
// VBO (vertex buffer) // VBO (vertex buffer)
glBindBuffer(GL_ARRAY_BUFFER, m_vbo); glBindBuffer(GL_ARRAY_BUFFER, m_vbo);
glBufferData(GL_ARRAY_BUFFER, 0, nullptr, GL_STATIC_DRAW); glBufferData(GL_ARRAY_BUFFER, 0, nullptr, GL_DYNAMIC_DRAW);
// EBO (index buffer) // EBO (index buffer)
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_ebo); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_ebo);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, 0, nullptr, GL_STATIC_DRAW); glBufferData(GL_ELEMENT_ARRAY_BUFFER, 0, nullptr, GL_DYNAMIC_DRAW);
Vertex::DefineAttrib(); // attributes
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), reinterpret_cast<const void*>(offsetof(Vertex, m_position)));
glEnableVertexAttribArray(0);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), reinterpret_cast<const void*>(offsetof(Vertex, m_normal)));
glEnableVertexAttribArray(1);
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), reinterpret_cast<const void*>(offsetof(Vertex, m_texCoord)));
glEnableVertexAttribArray(2);
glBindBuffer(GL_ARRAY_BUFFER, 0); glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindVertexArray(0); glBindVertexArray(0);
@ -29,18 +39,22 @@ void Mesh::Upload() const {
glBindVertexArray(m_vao); glBindVertexArray(m_vao);
glBindBuffer(GL_ARRAY_BUFFER, m_vbo); glBindBuffer(GL_ARRAY_BUFFER, m_vbo);
glBufferData(GL_ARRAY_BUFFER, m_vertexBuffer.size() * sizeof(Vertex), m_vertexBuffer.data(), GL_STATIC_DRAW); glBufferData(GL_ARRAY_BUFFER, m_vertexBuffer.size() * sizeof(Vertex), m_vertexBuffer.data(), GL_DYNAMIC_DRAW);
// Upload indices // Upload indices
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_ebo); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_ebo);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, m_indexBuffer.size() * sizeof(unsigned int), m_indexBuffer.data(), GL_STATIC_DRAW); glBufferData(GL_ELEMENT_ARRAY_BUFFER, m_indexBuffer.size() * sizeof(unsigned int), m_indexBuffer.data(), GL_DYNAMIC_DRAW);
glBindVertexArray(0); glBindVertexArray(0);
} }
void Mesh::Render() void Mesh::Render(unsigned int count)
{ {
Bind(); Bind();
if (count > 1) {
glDrawElementsInstanced(GL_TRIANGLES, static_cast<GLsizei>(m_indexBuffer.size()), GL_UNSIGNED_INT, 0, count);
} else {
glDrawElements(GL_TRIANGLES, static_cast<GLsizei>(m_indexBuffer.size()), GL_UNSIGNED_INT, 0); glDrawElements(GL_TRIANGLES, static_cast<GLsizei>(m_indexBuffer.size()), GL_UNSIGNED_INT, 0);
}
Unbind(); Unbind();
} }