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feat: rendering improvemenets

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This commit is contained in:
Amir Adal
2025-10-18 17:55:26 +02:00
parent fa9076b834
commit ecba8247bf
4 changed files with 23 additions and 12 deletions
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17
engine/src/components/batch.cpp
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@ -11,9 +11,20 @@ batch::batch() {
void batch::prepare(glm::mat4 *instances, unsigned int count) {
if (m_instance_vbo == 0) {
glGenBuffers(1, &m_instance_vbo);
glBindBuffer(GL_ARRAY_BUFFER, m_instance_vbo);
// Allocate *once*, no data yet — just reserve space
glBufferData(GL_ARRAY_BUFFER, sizeof(glm::mat4) * count, nullptr, GL_DYNAMIC_DRAW);
m_instance_count = count;
} else if (count > m_instance_count) {
// Optional: reallocate only if you *really* have more instances than before
glBindBuffer(GL_ARRAY_BUFFER, m_instance_vbo);
glBufferData(GL_ARRAY_BUFFER, sizeof(glm::mat4) * count, nullptr, GL_DYNAMIC_DRAW);
m_instance_count = count;
} else {
glBindBuffer(GL_ARRAY_BUFFER, m_instance_vbo);
}
glBindBuffer(GL_ARRAY_BUFFER, m_instance_vbo);
glBufferData(GL_ARRAY_BUFFER, sizeof(glm::mat4) * count, reinterpret_cast<void*>(instances), GL_DYNAMIC_DRAW);
// Just update the data region — much cheaper
glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(glm::mat4) * count, instances);
glBindBuffer(GL_ARRAY_BUFFER, 0);
}