-#define MAX_TEXTUREUNITS 8
-
-extern int c_meshtris, c_meshs, c_transtris, c_transmeshs;
-
-typedef struct
-{
- int transparent;
- int depthwrite; // force depth writing enabled even if polygon is not opaque
- int depthdisable; // disable depth read/write entirely
- int blendfunc1;
- int blendfunc2;
- int numtriangles;
- int *index;
- int numverts;
- float *vertex;
- int vertexstep;
- float *color;
- int colorstep;
- float cr, cg, cb, ca; // if color is NULL, these are used for all vertices
- int tex[MAX_TEXTUREUNITS];
- float *texcoords[MAX_TEXTUREUNITS];
- int texcoordstep[MAX_TEXTUREUNITS];
- int texrgbscale[MAX_TEXTUREUNITS]; // used only if COMBINE is present
-}
-rmeshinfo_t;
-
-typedef struct
+// how many texture units to track state on (backendunits/backendimageunits/backendarrayunits are limited to this value)
+#define MAX_TEXTUREUNITS 64
+
+#define POLYGONELEMENTS_MAXPOINTS 258
+extern unsigned short polygonelements[(POLYGONELEMENTS_MAXPOINTS-2)*3];
+#define QUADELEMENTS_MAXQUADS 128
+extern unsigned short quadelements[QUADELEMENTS_MAXQUADS*6];
+
+void R_Viewport_TransformToScreen(const r_viewport_t *v, const vec4_t in, vec4_t out);
+void R_Viewport_InitOrtho(r_viewport_t *v, const matrix4x4_t *cameramatrix, int x, int y, int width, int height, double x1, double y1, double x2, double y2, double zNear, double zFar, const double *nearplane);
+void R_Viewport_InitPerspective(r_viewport_t *v, const matrix4x4_t *cameramatrix, int x, int y, int width, int height, double frustumx, double frustumy, double zNear, double zFar, const double *nearplane);
+void R_Viewport_InitPerspectiveInfinite(r_viewport_t *v, const matrix4x4_t *cameramatrix, int x, int y, int width, int height, double frustumx, double frustumy, double zNear, const double *nearplane);
+void R_Viewport_InitCubeSideView(r_viewport_t *v, const matrix4x4_t *cameramatrix, int side, int size, float nearclip, float farclip, const float *nearplane);
+void R_Viewport_InitRectSideView(r_viewport_t *v, const matrix4x4_t *cameramatrix, int side, int size, int border, float nearclip, float farclip, const float *nearplane);
+void R_SetViewport(const r_viewport_t *v);
+void R_GetViewport(r_viewport_t *v);
+
+void GL_BlendFunc(int blendfunc1, int blendfunc2);
+void GL_DepthMask(int state);
+void GL_DepthTest(int state);
+void GL_DepthRange(float nearfrac, float farfrac);
+void GL_PolygonOffset(float planeoffset, float depthoffset);
+void GL_CullFace(int state);
+void GL_AlphaTest(int state);
+void GL_ColorMask(int r, int g, int b, int a);
+void GL_Color(float cr, float cg, float cb, float ca);
+void GL_LockArrays(int first, int count);
+void GL_ActiveTexture(unsigned int num);
+void GL_ClientActiveTexture(unsigned int num);
+void GL_Scissor(int x, int y, int width, int height);
+void GL_ScissorTest(int state);
+void GL_Clear(int mask);
+
+unsigned int GL_Backend_CompileProgram(int vertexstrings_count, const char **vertexstrings_list, int geometrystrings_count, const char **geometrystrings_list, int fragmentstrings_count, const char **fragmentstrings_list);
+void GL_Backend_FreeProgram(unsigned int prog);
+
+extern cvar_t gl_lockarrays;
+extern cvar_t gl_mesh_copyarrays;
+extern cvar_t gl_paranoid;
+extern cvar_t gl_printcheckerror;
+
+//input to R_Mesh_TextureState
+typedef struct rmeshstate_s