From 040ba6826237eb124aaa4576fc302e2e07dd40c5 Mon Sep 17 00:00:00 2001
From: sanine-a <sanine.not@pm.me>
Date: Wed, 20 May 2020 20:51:05 -0500
Subject: add honey_mesh and assorted related functions

---
 src/honey_setup.c | 28 ++++++++++++++++++
 src/mesh.c        | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/primitives.c  |  3 ++
 src/shader.c      |  2 --
 4 files changed, 117 insertions(+), 2 deletions(-)
 create mode 100644 src/honey_setup.c
 create mode 100644 src/mesh.c
 create mode 100644 src/primitives.c

(limited to 'src')

diff --git a/src/honey_setup.c b/src/honey_setup.c
new file mode 100644
index 0000000..247c325
--- /dev/null
+++ b/src/honey_setup.c
@@ -0,0 +1,28 @@
+#include "include/honey.h"
+
+honey_window honey_setup(int screen_width, int screen_height, char* window_title) {
+  glfwInit();
+  glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+  glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+  glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+
+  honey_window window = glfwCreateWindow(screen_width, screen_height, window_title, NULL, NULL);
+  if (window == NULL) {
+    fprintf(stderr, "ERROR: failed to create window!\n");
+    glfwTerminate();
+    return NULL;
+  }
+
+  glfwMakeContextCurrent(window);
+  glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
+
+  if (!gladLoadGLLoader((GLADloadproc) glfwGetProcAddress)) {
+    fprintf(stderr, "ERROR: failed to initialize GLAD!\n");
+    glfwTerminate();
+    return NULL;
+  }
+
+  return window;
+}
+
+  
diff --git a/src/mesh.c b/src/mesh.c
new file mode 100644
index 0000000..1b0fb1a
--- /dev/null
+++ b/src/mesh.c
@@ -0,0 +1,86 @@
+#include "include/mesh.h"
+
+enum honey_mesh_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 BAD_VERTEX_DATA;
+  }
+  if (indices == NULL || n_indices == 0) {
+    return 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 MEMORY_ERROR;
+  }
+  memcpy((*mesh).vertices, vertices, vertex_size*n_vertices*sizeof(float));
+
+  (*mesh).indices = malloc(n_indices * sizeof(unsigned int));
+  if ((*mesh).indices == NULL) {
+    return MEMORY_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 MESH_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/primitives.c b/src/primitives.c
new file mode 100644
index 0000000..798a691
--- /dev/null
+++ b/src/primitives.c
@@ -0,0 +1,3 @@
+#ifndef HONEY_PRIMITIVE_OBJECTS
+#define HONEY_PRIMITIVE_OBJECTS
+
diff --git a/src/shader.c b/src/shader.c
index 496b9f9..207ce30 100644
--- a/src/shader.c
+++ b/src/shader.c
@@ -1,5 +1,3 @@
-#include <stdio.h>
-#include "include/glad.h"
 #include "include/shader.h"
 
 /* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
-- 
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