Moved texture setting around

src/duskgl/display/shader/shadergl.h

@@ -9,28 +9,35 @@
 #include "error/errorgl.h"
 #include "display/texture/texture.h"
 
-typedef struct {
+typedef struct shadergl_s shadergl_t;
+
+typedef errorret_t (*shadersettexturefn_t)(
+  shadergl_t *,
+  const char_t *,
+  texture_t *
+);
+
+typedef struct shadergl_s {
   #ifdef DUSK_OPENGL_LEGACY
-    void *nothing;
+    mat4 view;
+    mat4 proj;
+    mat4 model;
   #else
     GLuint shaderProgramId;
     GLuint vertexShaderId;
     GLuint fragmentShaderId;
-  #endif
-
-  #if DUSK_OPENGL_LEGACY
-    mat4 view;
-    mat4 proj;
-    mat4 model;
+    shadersettexturefn_t setTexture;
   #endif
 } shadergl_t;
 
+
 typedef struct {
   #ifdef DUSK_OPENGL_LEGACY
     void *nothing;
   #else
     const char_t *vert;
     const char_t *frag;
+    shadersettexturefn_t setTexture;
   #endif
 } shaderdefinitiongl_t;