From b46a0d9369fbaa1938f0968ab216bc2d564a9c37 Mon Sep 17 00:00:00 2001
From: fschildt <florian.schildt@protonmail.com>
Date: Mon, 21 Jul 2025 16:07:28 +0200
Subject: first commit

---
 src/renderer/opengl/GlVertexBuffer.cpp | 54 ++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 src/renderer/opengl/GlVertexBuffer.cpp

(limited to 'src/renderer/opengl/GlVertexBuffer.cpp')

diff --git a/src/renderer/opengl/GlVertexBuffer.cpp b/src/renderer/opengl/GlVertexBuffer.cpp
new file mode 100644
index 0000000..f716c50
--- /dev/null
+++ b/src/renderer/opengl/GlVertexBuffer.cpp
@@ -0,0 +1,54 @@
+#include <renderer/opengl/GlVertexBuffer.hpp>
+
+#include <GL/glew.h>
+#include <string.h>
+
+#include <stdio.h>
+
+void GlVertexBuffer::Init() {
+    m_Vertices.reserve(16384);
+    glGenBuffers(1, &m_Id);
+    glBindBuffer(GL_ARRAY_BUFFER, m_Id);
+}
+
+void GlVertexBuffer::Reset() {
+    glDisableVertexAttribArray(0);
+    glDisableVertexAttribArray(1);
+    m_Vertices.clear();
+}
+
+float *GlVertexBuffer::GetData() {
+    return reinterpret_cast<float*>(m_Vertices.data());
+}
+
+uint32_t GlVertexBuffer::GetCount() {
+    return static_cast<uint32_t>(m_Vertices.size());
+}
+
+void GlVertexBuffer::PushRectangle(V3F32 pos, V2F32 dim, V3F32 color) {
+    V3F32 positions[4] = {
+        V3F32(pos.x,         pos.y,         pos.z),
+        V3F32(pos.x + dim.x, pos.y,         pos.z),
+        V3F32(pos.x + dim.x, pos.y + dim.y, pos.z),
+        V3F32(pos.x,         pos.y + dim.y, pos.z),
+    };
+
+    for (int i = 0; i < 4; i++) {
+        GlVertex vertex = {};
+        vertex.pos = positions[i];
+        vertex.color = color;
+        m_Vertices.push_back(vertex);
+    }
+}
+
+void GlVertexBuffer::TransferData() {
+    size_t size = m_Vertices.size() * sizeof(GlVertex);
+    GLsizei stride = sizeof(GlVertex);
+    const void *offset_color = (const void*)(3*sizeof(float));
+    glEnableVertexAttribArray(0);
+    glEnableVertexAttribArray(1);
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, stride, 0);
+    glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, stride, offset_color);
+    glBufferData(GL_ARRAY_BUFFER, size, m_Vertices.data(), GL_STATIC_DRAW);
+}
+
-- 
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