started geometry type and functions

glisy · Feb 10, 2016 · a17cd52 · a17cd52
1 parent 2fb2caf
commit a17cd52
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diff --git a/include/glisy/geometry.h b/include/glisy/geometry.h
@@ -0,0 +1,55 @@
+#ifndef GLISY_GEOMETRY_H
+#define GLISY_GEOMETRY_H
+
+#include <glisy/vao.h>
+#include <glisy/buffer.h>
+
+/**
+ * Glisy Geometry struct type.
+ */
+
+typedef struct glisy_geometry glisy_geometry;
+struct glisy_geometry {
+
+  // vertext array object
+  glisy_vao vao;
+
+  // array of vao attributes
+  glisy_vao_attribute *attributes[GLISY_MAX_VAO_ATTRIBS];
+
+  // length os vao attributes array
+  GLuint attrlen;
+
+  // index buffer
+  glisy_buffer index;
+
+  // does the geometry need an update
+  GLboolean dirty;
+
+};
+
+/**
+ * Glisy Geometry initializer.
+ * @param geometry - pointer to a Glisy Geometry struct
+ */
+
+void
+glisy_geometry_init(glisy_geometry *geometry);
+
+/**
+ * Glisy Geometry update.
+ * @param geometry - pointer to a Glisy Geometry struct
+ */
+
+void
+glisy_geometry_update(glisy_geometry *geometry);
+
+/**
+ * Glisy Geometry attributes.
+ * @param geometry - pointer to a Glisy Geometry struct
+ */
+
+void
+glisy_geometry_attr(glisy_geometry *geometry, GLchar *name, glisy_vao_attribute *attr);
+
+#endif
diff --git a/src/geometry.c b/src/geometry.c
@@ -0,0 +1,56 @@
+#include <strings.h>
+#include <glisy/geometry.h>
+
+// push a vao attribute onto the geometry attributes array
+static void
+push_attr(glisy_geometry *geometry, glisy_vao_attribute *attribute) {
+  if (geometry == NULL) return;
+  if (attribute == NULL) return;
+
+  if (geometry->attrlen < GLISY_MAX_VAO_ATTRIBS) {
+    geometry->attributes[geometry->attrlen++] = attribute;
+  }
+}
+
+/**
+ * Glisy Geometry initializer.
+ */
+
+void
+glisy_geometry_init(glisy_geometry *geometry) {
+  if (geometry == NULL) return;
+
+  geometry->attrlen = 0;
+  geometry->dirty = GL_FALSE;
+
+  memset(&geometry->attributes, 0, sizeof(glisy_vao_attribute *) * GLISY_MAX_VAO_ATTRIBS);
+  glisy_vao_init(&geometry->vao);
+}
+
+/**
+ * Glisy Geometry update.
+ */
+
+void
+glisy_geometry_update(glisy_geometry *geometry) {
+  if (geometry == NULL) return;
+  if (!geometry->dirty) return;
+
+  glisy_vao_dispose(&geometry->vao);
+  glisy_vao_init(&geometry->vao);
+  //@TODO(jwerle): complete me
+}
+
+/**
+ * Glisy Geometry attributes.
+ */
+
+void
+glisy_geometry_attr(glisy_geometry *geometry, GLchar *name, glisy_vao_attribute *attr) {
+  if (geometry == NULL) return;
+  if (name == NULL) return;
+
+  geometry->dirty = GL_TRUE;
+  attr->name = name;
+  push_attr(geometry, attr);
+}