-void GL_BrightenScreen(void)
-{
- float f;
-
- if (r_brightness.value < 0.1f)
- Cvar_SetValue("r_brightness", 0.1f);
- if (r_brightness.value > 5.0f)
- Cvar_SetValue("r_brightness", 5.0f);
-
- if (r_contrast.value < 0.2f)
- Cvar_SetValue("r_contrast", 0.2f);
- if (r_contrast.value > 1.0f)
- Cvar_SetValue("r_contrast", 1.0f);
-
- if (!(lighthalf && !hardwaregammasupported) && r_brightness.value < 1.01f && r_contrast.value > 0.99f)
- return;
-
- if (!r_render.integer)
- return;
-
- glDisable(GL_TEXTURE_2D);
- CHECKGLERROR
- glEnable(GL_BLEND);
- CHECKGLERROR
- f = r_brightness.value;
- // only apply lighthalf using software color correction if hardware is not available (speed reasons)
- if (lighthalf && !hardwaregammasupported)
- f *= 2;
- if (f >= 1.01f)
- {
- glBlendFunc (GL_DST_COLOR, GL_ONE);
- CHECKGLERROR
- glBegin (GL_TRIANGLES);
- while (f >= 1.01f)
- {
- if (f >= 2)
- glColor3f (1, 1, 1);
- else
- glColor3f (f-1, f-1, f-1);
- glVertex2f (-5000, -5000);
- glVertex2f (10000, -5000);
- glVertex2f (-5000, 10000);
- f *= 0.5;
- }
- glEnd ();
- CHECKGLERROR
- }
- if (r_contrast.value <= 0.99f)
- {
- glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
- CHECKGLERROR
- if (lighthalf && hardwaregammasupported)
- glColor4f (0.5, 0.5, 0.5, 1 - r_contrast.value);
- else
- glColor4f (1, 1, 1, 1 - r_contrast.value);
- CHECKGLERROR
- glBegin (GL_TRIANGLES);
- glVertex2f (-5000, -5000);
- glVertex2f (10000, -5000);
- glVertex2f (-5000, 10000);
- glEnd ();
- CHECKGLERROR
- }
- glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
- CHECKGLERROR
-
- glEnable (GL_CULL_FACE);
- CHECKGLERROR
- glEnable (GL_DEPTH_TEST);
- CHECKGLERROR
- glDisable(GL_BLEND);
- CHECKGLERROR
- glEnable(GL_TEXTURE_2D);
- CHECKGLERROR
-}
-