+typedef enum gl20_texunit_e
+{
+ // postprocess shaders, and generic shaders:
+ GL20TU_FIRST = 0,
+ GL20TU_SECOND = 1,
+ GL20TU_GAMMARAMPS = 2,
+ // standard material properties
+ GL20TU_NORMAL = 0,
+ GL20TU_COLOR = 1,
+ GL20TU_GLOSS = 2,
+ GL20TU_GLOW = 3,
+ // material properties for a second material
+ GL20TU_SECONDARY_NORMAL = 4,
+ GL20TU_SECONDARY_COLOR = 5,
+ GL20TU_SECONDARY_GLOSS = 6,
+ GL20TU_SECONDARY_GLOW = 7,
+ // material properties for a colormapped material
+ // conflicts with secondary material
+ GL20TU_PANTS = 4,
+ GL20TU_SHIRT = 5,
+ // fog fade in the distance
+ GL20TU_FOGMASK = 8,
+ // compiled ambient lightmap and deluxemap
+ GL20TU_LIGHTMAP = 9,
+ GL20TU_DELUXEMAP = 10,
+ // refraction, used by water shaders
+ GL20TU_REFRACTION = 3,
+ // reflection, used by water shaders, also with normal material rendering
+ // conflicts with secondary material
+ GL20TU_REFLECTION = 7,
+ // rtlight attenuation (distance fade) and cubemap filter (projection texturing)
+ // conflicts with lightmap/deluxemap
+ GL20TU_ATTENUATION = 9,
+ GL20TU_CUBE = 10,
+}
+gl20_texunit;
+
+void R_SetupGenericShader(qboolean usetexture);
+void R_SetupGenericTwoTextureShader(int texturemode);
+void R_SetupDepthOrShadowShader(void);
+void R_SetupSurfaceShader(const vec3_t lightcolorbase, qboolean modellighting, float ambientscale, float diffusescale, float specularscale, rsurfacepass_t rsurfacepass);
+
+typedef struct r_waterstate_waterplane_s
+{
+ rtexture_t *texture_refraction;
+ rtexture_t *texture_reflection;
+ mplane_t plane;
+ int materialflags; // combined flags of all water surfaces on this plane
+ unsigned char pvsbits[(32768+7)>>3]; // FIXME: buffer overflow on huge maps
+ qboolean pvsvalid;
+}
+r_waterstate_waterplane_t;
+
+#define MAX_WATERPLANES 16
+
+typedef struct r_waterstate_s
+{
+ qboolean enabled;
+
+ qboolean renderingscene; // true while rendering a refraction or reflection texture, disables water surfaces
+
+ int waterwidth, waterheight;
+ int texturewidth, textureheight;
+
+ int maxwaterplanes; // same as MAX_WATERPLANES
+ int numwaterplanes;
+ r_waterstate_waterplane_t waterplanes[MAX_WATERPLANES];
+
+ float screenscale[2];
+ float screencenter[2];
+}
+r_waterstate_t;
+
+extern r_waterstate_t r_waterstate;