GL: don't draw the screens when nothing is running

1 files changed, 27 insertions, 24 deletions

diff --git a/src/libui_sdl/main.cpp b/src/libui_sdl/main.cpp
index 6cc6c50..c351a04 100644
--- a/src/libui_sdl/main.cpp
+++ b/src/libui_sdl/main.cpp
@@ -396,35 +396,38 @@ void GLScreen_DrawScreen()
     glClearColor(0, 0, 0, 1);
     glClear(GL_COLOR_BUFFER_BIT);
 
-    int frontbuf = GPU::FrontBuffer;
-    glActiveTexture(GL_TEXTURE0);
-    glBindTexture(GL_TEXTURE_2D, GL_ScreenTexture);
-
-    if (GPU::Framebuffer[frontbuf][0] && GPU::Framebuffer[frontbuf][1])
+    if (RunningSomething)
     {
-        if (GPU3D::Renderer == 0)
-        {
-            glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 256, 192, GL_RGBA_INTEGER,
-                            GL_UNSIGNED_BYTE, GPU::Framebuffer[frontbuf][0]);
-            glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 192, 256, 192, GL_RGBA_INTEGER,
-                            GL_UNSIGNED_BYTE, GPU::Framebuffer[frontbuf][1]);
-        }
-        else
+        int frontbuf = GPU::FrontBuffer;
+        glActiveTexture(GL_TEXTURE0);
+        glBindTexture(GL_TEXTURE_2D, GL_ScreenTexture);
+
+        if (GPU::Framebuffer[frontbuf][0] && GPU::Framebuffer[frontbuf][1])
         {
-            glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 256*3 + 1, 192, GL_RGBA_INTEGER,
-                            GL_UNSIGNED_BYTE, GPU::Framebuffer[frontbuf][0]);
-            glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 192, 256*3 + 1, 192, GL_RGBA_INTEGER,
-                            GL_UNSIGNED_BYTE, GPU::Framebuffer[frontbuf][1]);
+            if (GPU3D::Renderer == 0)
+            {
+                glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 256, 192, GL_RGBA_INTEGER,
+                                GL_UNSIGNED_BYTE, GPU::Framebuffer[frontbuf][0]);
+                glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 192, 256, 192, GL_RGBA_INTEGER,
+                                GL_UNSIGNED_BYTE, GPU::Framebuffer[frontbuf][1]);
+            }
+            else
+            {
+                glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 256*3 + 1, 192, GL_RGBA_INTEGER,
+                                GL_UNSIGNED_BYTE, GPU::Framebuffer[frontbuf][0]);
+                glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 192, 256*3 + 1, 192, GL_RGBA_INTEGER,
+                                GL_UNSIGNED_BYTE, GPU::Framebuffer[frontbuf][1]);
+            }
         }
-    }
 
-    glActiveTexture(GL_TEXTURE1);
-    if (GPU3D::Renderer != 0)
-        GPU3D::GLRenderer::SetupAccelFrame();
+        glActiveTexture(GL_TEXTURE1);
+        if (GPU3D::Renderer != 0)
+            GPU3D::GLRenderer::SetupAccelFrame();
 
-    glBindBuffer(GL_ARRAY_BUFFER, GL_ScreenVertexBufferID);
-    glBindVertexArray(GL_ScreenVertexArrayID);
-    glDrawArrays(GL_TRIANGLES, 0, 4*3);
+        glBindBuffer(GL_ARRAY_BUFFER, GL_ScreenVertexBufferID);
+        glBindVertexArray(GL_ScreenVertexArrayID);
+        glDrawArrays(GL_TRIANGLES, 0, 4*3);
+        }
 
     glFlush();
     uiGLSwapBuffers(GLContext);