Small improvements to performance

src/duskgl/display/shader/shadergl.c

@@ -223,23 +223,24 @@ errorret_t shaderSetTextureGL(
       "Only one texture supported in legacy opengl."
     );
 
-    // glActiveTexture(GL_TEXTURE0);
-    errorChain(errorGLCheck());
-
     if(texture == NULL) {
-      glDisable(GL_TEXTURE_2D);
-      errorChain(errorGLCheck());
-
+      if(SHADER_LEGACY.boundTextureId != 0) {
+        glDisable(GL_TEXTURE_2D);
+        errorChain(errorGLCheck());
+        SHADER_LEGACY.boundTextureId = 0;
+      }
       errorOk();
     }
 
-    glEnable(GL_TEXTURE_2D);
-    errorChain(errorGLCheck());
-    glBindTexture(GL_TEXTURE_2D, texture->id);
-    errorChain(errorGLCheck());
-    
-    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
-    errorChain(errorGLCheck());
+    if(texture->id != SHADER_LEGACY.boundTextureId) {
+      glEnable(GL_TEXTURE_2D);
+      errorChain(errorGLCheck());
+      glBindTexture(GL_TEXTURE_2D, texture->id);
+      errorChain(errorGLCheck());
+      glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
+      errorChain(errorGLCheck());
+      SHADER_LEGACY.boundTextureId = texture->id;
+    }
 
     // glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
     // errorChain(errorGLCheck());

src/duskgl/display/shader/shadergl.h

@@ -48,6 +48,7 @@ typedef struct shadergl_s {
   typedef struct {
     shadergl_t *boundShader;
     uint_fast8_t dirty;
+    GLuint boundTextureId;
   } shaderlegacygl_t;
 
   extern shaderlegacygl_t SHADER_LEGACY;