Cleanup: GPU: Encapsulate glViewport calls

source/blender/gpu/GPU_state.h

@@ -63,6 +63,7 @@ void GPU_program_point_size(bool enable);
 void GPU_scissor(int x, int y, int width, int height);
 void GPU_scissor_get_f(float coords[4]);
 void GPU_scissor_get_i(int coords[4]);
+void GPU_viewport(int x, int y, int width, int height);
 void GPU_viewport_size_get_f(float coords[4]);
 void GPU_viewport_size_get_i(int coords[4]);
 void GPU_color_mask(bool r, bool g, bool b, bool a);

source/blender/gpu/intern/gpu_select_pick.c

@@ -320,7 +320,7 @@ void gpu_select_pick_begin(uint (*buffer)[4], uint bufsize, const rcti *input, c
     glDepthFunc(GL_LEQUAL);
 
     float viewport[4];
-    glGetFloatv(GL_VIEWPORT, viewport);
+    GPU_viewport_size_get_f(viewport);
 
     ps->src.clip_rect = *input;
     ps->src.rect_len = rect_len;
@@ -330,7 +330,7 @@ void gpu_select_pick_begin(uint (*buffer)[4], uint bufsize, const rcti *input, c
     ps->gl.clip_readpixels[2] = BLI_rcti_size_x(&ps->src.clip_rect);
     ps->gl.clip_readpixels[3] = BLI_rcti_size_y(&ps->src.clip_rect);
 
-    glViewport(UNPACK4(ps->gl.clip_readpixels));
+    GPU_viewport(UNPACK4(ps->gl.clip_readpixels));
 
     /* It's possible we don't want to clear depth buffer,
      * so existing elements are masked by current z-buffer. */

source/blender/gpu/intern/gpu_select_sample_query.c

@@ -94,8 +94,8 @@ void gpu_select_query_begin(
    * We need to get the region of the viewport so that our geometry doesn't
    * get rejected before the depth test. Should probably cull rect against
    * the viewport but this is a rare case I think */
-  glGetFloatv(GL_VIEWPORT, viewport);
-  glViewport(viewport[0], viewport[1], BLI_rcti_size_x(input), BLI_rcti_size_y(input));
+  GPU_viewport_size_get_f(viewport);
+  GPU_viewport(viewport[0], viewport[1], BLI_rcti_size_x(input), BLI_rcti_size_y(input));
 
   /* occlusion queries operates on fragments that pass tests and since we are interested on all
    * objects in the view frustum independently of their order, we need to disable the depth test */

source/blender/gpu/intern/gpu_state.c

@@ -151,6 +151,11 @@ void GPU_scissor(int x, int y, int width, int height)
   glScissor(x, y, width, height);
 }
 
+void GPU_viewport(int x, int y, int width, int height)
+{
+  glViewport(x, y, width, height);
+}
+
 void GPU_scissor_get_f(float coords[4])
 {
   glGetFloatv(GL_SCISSOR_BOX, coords);