initial

1 files changed, 65 insertions, 0 deletions

diff --git a/prge_mesh.c b/prge_mesh.c
new file mode 100644
index 0000000..dc2c2da
--- /dev/null
+++ b/prge_mesh.c
@@ -0,0 +1,65 @@
+Vertex vertex(V3 pos)
+{
+	Vertex v = { pos };
+	return v;
+}
+
+void mesh_init_buffers(Mesh *mesh)
+{
+	Assert(mesh->verts);
+	Assert(mesh->nverts > 0);
+	
+	glGenVertexArrays(1, &mesh->vao);
+	glBindVertexArray(mesh->vao);
+
+	glGenBuffers(1, &mesh->vbo);
+	glBindBuffer(GL_ARRAY_BUFFER, mesh->vbo);
+	glBufferData(GL_ARRAY_BUFFER, mesh->nverts*sizeof(Vertex), mesh->verts, GL_STATIC_DRAW);
+
+	if (mesh->indices && (mesh->nindices > 0)) {
+		glGenBuffers(1, &mesh->ebo);
+		glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mesh->ebo);
+		glBufferData(GL_ELEMENT_ARRAY_BUFFER, mesh->nindices*sizeof(U32), mesh->indices, GL_STATIC_DRAW);
+	}
+
+	glEnableVertexAttribArray(PRGE_SHADER_POS_LOC);
+	glVertexAttribPointer(PRGE_SHADER_POS_LOC, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), 0);
+	glBindVertexArray(0);
+}
+
+Mesh *mesh(Arena *arena, Vertex *verts, U32 nverts, U32 *indices, U32 nindices)
+{
+	Mesh *mesh = arena_push(arena, sizeof(Mesh));
+	mesh->verts = verts;
+	mesh->nverts = nverts;
+	mesh->indices = indices;
+	mesh->nindices = nindices;
+	mesh_init_buffers(mesh);
+	return mesh;
+}
+
+void mesh_clear(Mesh *mesh)
+{
+	glBindVertexArray(mesh->vao);
+	glDisableVertexAttribArray(PRGE_SHADER_POS_LOC);
+
+	glBindVertexArray(0);
+	glDeleteVertexArrays(1, &mesh->vao);
+	
+	glBindBuffer(GL_ARRAY_BUFFER, 0);
+	glDeleteBuffers(1, &mesh->vbo);
+
+	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
+	glDeleteBuffers(1, &mesh->ebo);
+}
+
+void mesh_draw(Mesh mesh)
+{
+	Assert(mesh.vao);
+	glBindVertexArray(mesh.vao);
+	if (mesh.ebo)
+		glDrawElements(GL_TRIANGLES, mesh.nindices, GL_UNSIGNED_INT, 0);
+	else
+		glDrawArrays(GL_TRIANGLES, 0, mesh.nverts);
+	glBindVertexArray(0);
+}