From 41fa908dc15b522e53946a716f4f6c00520bd46f Mon Sep 17 00:00:00 2001
From: sanine-a <sanine.not@pm.me>
Date: Mon, 19 Oct 2020 05:35:06 -0500
Subject: add honey libraries back and reorganize directories

---
 src/mesh/mesh.c | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/mesh/mesh.h | 57 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 143 insertions(+)
 create mode 100644 src/mesh/mesh.c
 create mode 100644 src/mesh/mesh.h

(limited to 'src/mesh')

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));
+}
diff --git a/src/mesh/mesh.h b/src/mesh/mesh.h
new file mode 100644
index 0000000..a3e1e2a
--- /dev/null
+++ b/src/mesh/mesh.h
@@ -0,0 +1,57 @@
+#ifndef HONEY_MESH_H
+#define HONEY_MESH_H
+
+/** @file mesh.h
+ *
+ * @brief Defines the honey_mesh struct and related basic mesh functions. 
+*/
+
+
+
+#include "../common.h"
+#include "../shader/shader.h"
+
+typedef struct {
+  float* vertices;
+  unsigned int n_vertices;
+  unsigned int* indices;
+  unsigned int n_indices;
+  unsigned int vertex_array, vertex_buffer, element_buffer;
+} honey_mesh;
+
+/** @brief Create a new mesh from vertex and index arrays.
+ *
+ * Note that this function creates copies of the vertex and index arrays, 
+ * so you can deallocate those immediately.
+ *
+ * @param[out] mesh Pointer to the destination honey_mesh struct
+ * @param[in] vertices Array of floats representing the vertices
+ * @param[in] n_attributes The number of attributes per vertex
+ * @param[in] attribute_sizes An array containing for each attribute how many floats it contains
+ * @param[in] n_vertices The number of vertices (NOT the number of floats in the vertex array)
+ * @param[in] indices Array of vertex indices
+ * @param[in] n_indices The number of elements in the index array
+ */
+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);
+
+/** @brief Draw a mesh on screen.
+ *
+ * @param[in] mesh The mesh to draw
+ * @param[in] shader The shader to use when drawing the mesh
+ */
+void honey_mesh_draw(honey_mesh mesh,
+                     honey_shader shader);
+
+/** @brief Delete a mesh.
+ *
+ * @param[in] mesh The mesh to delete
+ */
+void honey_mesh_delete(honey_mesh mesh);
+  
+#endif
-- 
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