From d2b167f2d1ca15e42a177b65cdf34f35592452f7 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sat, 13 Feb 2021 14:52:03 +0000
Subject: New .obj parser, packer, mesher

---
 gfx/models/obj.ll | 121 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 121 insertions(+)
 create mode 100644 gfx/models/obj.ll

(limited to 'gfx/models/obj.ll')

diff --git a/gfx/models/obj.ll b/gfx/models/obj.ll
new file mode 100644
index 0000000..9329a5a
--- /dev/null
+++ b/gfx/models/obj.ll
@@ -0,0 +1,121 @@
+%option batch
+%option c++
+%option noyywrap
+%option 8bit
+%option stack
+%option yyclass="ObjParser"
+%option prefix="objbase"
+
+%{
+#pragma GCC diagnostic ignored "-Wsign-compare"
+#pragma GCC diagnostic ignored "-Wimplicit-fallthrough"
+#if __clang__
+#pragma GCC diagnostic ignored "-Wnull-conversion"
+#endif
+#include <gfx/models/obj.h>
+#include <glm/glm.hpp>
+#include <memory>
+#include <string>
+#include <vector>
+class objbaseFlexLexer;
+%}
+
+comment #.*
+float -?[0-9.]+
+index -?[0-9]+
+linestring [^\r\n]*
+truthy (1|on)
+falsey (0|off)
+
+%x FACE
+%x MTLLIB
+%x OBJECT
+%x SMOOTH
+%x USEMTL
+%x VERTEX
+%x NORMAL
+%x TEXCOORD
+
+%%
+
+<INITIAL>{comment} {
+  // fprintf(stderr, "COMMENT %s\n", YYText());
+}
+<INITIAL>"f " {
+  BEGIN(FACE);
+  faces.emplace_back();
+  faces.back().emplace_back();
+  axis = 0;
+}
+<INITIAL>"mtllib " {
+  BEGIN(MTLLIB);
+}
+<INITIAL>"o " {
+  BEGIN(OBJECT);
+}
+<INITIAL>"s " {
+  BEGIN(SMOOTH);
+}
+<INITIAL>"usemtl " {
+  BEGIN(USEMTL);
+}
+<INITIAL>"v " {
+  BEGIN(VERTEX);
+  vertices.emplace_back(0, 0, 0, 1);
+  axis = 0;
+}
+<INITIAL>"vn " {
+  BEGIN(NORMAL);
+  normals.emplace_back(0, 0, 0);
+  axis = 0;
+}
+<INITIAL>"vt " {
+  BEGIN(TEXCOORD);
+  texCoords.emplace_back(0, 1, 1);
+  axis = 0;
+}
+<USEMTL>{linestring} {
+  // fprintf(stderr, "USEMTL <%s>\n", YYText());
+}
+<MTLLIB>{linestring} {
+  // fprintf(stderr, "MTLLIB <%s>\n", YYText());
+}
+<OBJECT>{linestring} {
+  // fprintf(stderr, "OBJECT <%s>\n", YYText());
+}
+<SMOOTH>{truthy} {
+  // fprintf(stderr, "Set smooth\n");
+}
+<SMOOTH>{falsey} {
+  // fprintf(stderr, "Set flat\n");
+}
+<VERTEX>{float} {
+  vertices.back()[axis++] = std::stof(YYText());
+}
+<NORMAL>{float} {
+  normals.back()[axis++] = std::stof(YYText());
+}
+<TEXCOORD>{float} {
+  texCoords.back()[axis++] = std::stof(YYText());
+}
+<FACE>{index} {
+  faces.back().back()[axis] = std::stoi(YYText());
+}
+<FACE>\/ {
+  axis++;
+}
+<FACE>[ \t] {
+  faces.back().emplace_back();
+  axis = 0;
+}
+
+<*>[ \t] {
+}
+<*>[\r\n\f] {
+  BEGIN(INITIAL);
+}
+
+%%
+
+// Make iwyu think unistd.h is required
+[[maybe_unused]]static auto x=getpid;
-- 
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