initial commit

1 files changed, 76 insertions, 0 deletions

diff --git a/libs/pwyazh/mesh.h b/libs/pwyazh/mesh.h
new file mode 100644
index 0000000..9443a13
--- /dev/null
+++ b/libs/pwyazh/mesh.h
@@ -0,0 +1,76 @@
+#ifndef MESH_H
+#define MESH_H
+
+Vertex
+vertex(V3F pos, V3F normal, V2F tex_coords)
+{
+    Vertex result;
+    result.pos = pos;
+    result.normal = normal;
+    result.tex_coords = tex_coords;
+    return(result);
+}
+
+Mesh *
+mesh_init(Arena *arena,
+          Vertex *vertices, U32 vertex_count,
+          U32 *indices, U32 index_count)
+{
+    Mesh *mesh = 0;
+    U32 vbo, ebo;
+    
+    if (!vertices)
+    {
+        printf("[ERROR]: Vertices is null\n");
+        return(mesh);
+    }
+    if (!indices)
+    {
+        printf("[ERROR]: Indices is null\n");
+        return(mesh);
+    }
+    
+    Assert(arena);
+    mesh = arena_push_size(arena, sizeof(Mesh));
+    
+    mesh->vertices = vertices;
+    mesh->vertex_count = vertex_count;
+    
+    mesh->indices = indices;
+    mesh->index_count = index_count;
+    
+    glGenVertexArrays(1, &mesh->vao);
+    glBindVertexArray(mesh->vao);
+    
+    glGenBuffers(1, &vbo);
+    glBindBuffer(GL_ARRAY_BUFFER, vbo);
+    glBufferData(GL_ARRAY_BUFFER, vertex_count*sizeof(Vertex), vertices, GL_STATIC_DRAW);
+    
+    glGenBuffers(1, &ebo);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
+    glBufferData(GL_ELEMENT_ARRAY_BUFFER, index_count*sizeof(U32), indices, GL_STATIC_DRAW);
+    
+    glEnableVertexAttribArray(0);
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex),
+                          (void *)(OffsetOfMember(Vertex, pos)));
+    glEnableVertexAttribArray(1);
+    glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex),
+                          (void *)(OffsetOfMember(Vertex, normal)));
+    glEnableVertexAttribArray(2);
+    glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex),
+                          (void *)(OffsetOfMember(Vertex, tex_coords)));
+    
+    glBindVertexArray(0);
+    
+    return(mesh);
+}
+
+void
+mesh_draw(Mesh *mesh)
+{
+    glBindVertexArray(mesh->vao);
+    glDrawElements(GL_TRIANGLES, mesh->index_count, GL_UNSIGNED_INT, 0);
+    glBindVertexArray(0);
+}
+
+#endif /* MESH_H */
\ No newline at end of file