1 files changed, 86 insertions, 0 deletions
diff --git a/src/mesh/mesh.c b/src/mesh/mesh.c
new file mode 100644
index 0000000..231fcc9
--- /dev/null
+++ b/src/mesh/mesh.c
@@ -0,0 +1,86 @@
+#include "mesh.h"
+
+honey_result honey_mesh_new(honey_mesh* mesh,
+                            float* vertices,
+                            unsigned int n_vertices,
+                            unsigned int n_attributes,
+                            unsigned int* attribute_sizes,
+                            unsigned int* indices,
+                            unsigned int n_indices) {
+  if (vertices == NULL || n_vertices == 0) {
+    return HONEY_MESH_BAD_VERTEX_DATA;
+  }
+  if (indices == NULL || n_indices == 0) {
+    return HONEY_MESH_BAD_INDEX_DATA;
+  }
+
+  unsigned int vertex_size = 0;
+  for (int i=0; i<n_attributes; i++) {
+    vertex_size += attribute_sizes[i];
+  }
+
+  (*mesh).vertices = malloc(vertex_size*n_vertices * sizeof(float));
+  if ((*mesh).vertices == NULL) {
+    return HONEY_MEMORY_ALLOCATION_ERROR;
+  }
+  memcpy((*mesh).vertices, vertices, vertex_size*n_vertices*sizeof(float));
+
+  (*mesh).indices = malloc(n_indices * sizeof(unsigned int));
+  if ((*mesh).indices == NULL) {
+    return HONEY_MEMORY_ALLOCATION_ERROR;
+  }
+  memcpy((*mesh).indices, indices, n_indices * sizeof(unsigned int));
+
+  (*mesh).n_vertices = n_vertices;
+  (*mesh).n_indices  = n_indices;
+
+  glGenVertexArrays(1, &((*mesh).vertex_array));
+  glGenBuffers(1, &((*mesh).vertex_buffer));
+  glGenBuffers(1, &((*mesh).element_buffer));
+
+  glBindVertexArray((*mesh).vertex_array);
+
+  glBindBuffer(GL_ARRAY_BUFFER, (*mesh).vertex_buffer);
+  glBufferData(GL_ARRAY_BUFFER, vertex_size*n_vertices*sizeof(float), (*mesh).vertices, GL_STATIC_DRAW);
+
+  glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, (*mesh).element_buffer);
+  glBufferData(GL_ELEMENT_ARRAY_BUFFER, n_indices * sizeof(unsigned int), (*mesh).indices, GL_STATIC_DRAW);
+
+  /* set up vertex attributes */
+  unsigned int offset = 0;
+  for (int i=0; i<n_attributes; i++) {
+    glEnableVertexAttribArray(i);
+    glVertexAttribPointer(i,
+                          attribute_sizes[i],
+                          GL_FLOAT,
+                          GL_FALSE,
+                          vertex_size*sizeof(float),
+                          (void*) (offset*sizeof(float)));
+    offset += attribute_sizes[i];
+  }
+  
+  glBindVertexArray(0);
+
+  return HONEY_OK;
+}
+
+/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
+
+void honey_mesh_draw(honey_mesh mesh, honey_shader shader) {
+  honey_shader_use(shader);
+  
+  glBindVertexArray(mesh.vertex_array);
+  glDrawElements(GL_TRIANGLES, mesh.n_indices, GL_UNSIGNED_INT, 0);
+  glBindVertexArray(0);
+}
+
+/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
+
+void honey_mesh_delete(honey_mesh mesh) {
+  free(mesh.vertices);
+  free(mesh.indices);
+
+  glDeleteVertexArrays(1, &(mesh.vertex_array));
+  glDeleteBuffers(1, &(mesh.vertex_buffer));
+  glDeleteBuffers(1, &(mesh.element_buffer));
+}