feat: triangle is perfectly draw

res/render/primitives/p_triangle.hpp

@@ -0,0 +1,37 @@
+#ifndef P_TRIANGLE_HPP
+#define P_TRIANGLE_HPP
+
+#include <cstddef>
+
+#include "GLFW/glfw3.h"
+
+namespace mesh
+{
+// clang-format off
+  constexpr GLfloat P_TRIANGLE_VERTICE[] = {
+    -0.5f, -0.5f, 0.0f,
+     0.5f, -0.5f, 0.0f,
+     0.0f,  0.5f, 0.0f
+  };
+// clang-format on
+
+constexpr const std::size_t P_TRIANGLE_VERTICE_LEN =
+    sizeof(P_TRIANGLE_VERTICE) / sizeof(GLfloat);
+
+constexpr unsigned int P_TRIANGLE_INDICE[] = {
+    0, 1, 2,  // 1
+};
+
+constexpr const std::size_t P_TRIANGLE_INDICE_LEN =
+    sizeof(P_TRIANGLE_VERTICE) / sizeof(unsigned int);
+
+extern "C"
+{
+  extern const unsigned char P_TRIANGLE_VERT[];
+  extern const unsigned int P_TRIANGLE_VERT_LEN;
+  extern const unsigned char P_TRIANGLE_FRAG[];
+  extern const unsigned int P_TRIANGLE_FRAG_LEN;
+}
+}  // namespace mesh
+
+#endif