warzone2100/lib/ivis_opengl/piestate.c

/***************************************************************************/
/*
 * pieState.c
 *
 * renderer setup and state control routines for 3D rendering
 *
 */
/***************************************************************************/

#include <string.h>
#ifdef _MSC_VER	
#include <windows.h>  //needed for gl.h!  --Qamly
#endif
#include <GL/gl.h>

#include "frame.h"
#include "piestate.h"
#include "piedef.h"
#include "tex.h"

/***************************************************************************/
/*
 *	Global Variables
 */
/***************************************************************************/

SDWORD		pieStateCount = 0;
BOOL		bSwirls = FALSE;
BOOL		bWave = FALSE;
/***************************************************************************/
/*
 *	Local Definitions
 */
/***************************************************************************/

typedef	enum	COLOUR_MODE
				{
					COLOUR_FLAT_CONSTANT,
					COLOUR_FLAT_ITERATED,
					COLOUR_TEX_ITERATED,
					COLOUR_TEX_CONSTANT
				}
				COLOUR_MODE;

typedef	enum	TEX_MODE
				{
					TEX_LOCAL,
					TEX_NONE
				}
				TEX_MODE;

typedef	enum	ALPHA_MODE
				{
					ALPHA_ITERATED,
					ALPHA_CONSTANT
				}
				ALPHA_MODE;

typedef struct _renderState
{
	REND_ENGINE			rendEngine;
	BOOL				bHardware;
	DEPTH_MODE			depthBuffer;
	BOOL				translucent;
	BOOL				additive;
	FOG_CAP				fogCap;
	BOOL				fogEnabled;
	BOOL				fog;
	UDWORD				fogColour;
	TEX_CAP				texCap;
	SDWORD				texPage;
	REND_MODE			rendMode;
	BOOL				bilinearOn;
	BOOL				keyingOn;
	COLOUR_MODE			colourCombine;
	TEX_MODE			texCombine;
	ALPHA_MODE			alphaCombine;
	TRANSLUCENCY_MODE	transMode;
	UDWORD				colour;
#ifdef STATES
	BOOL				textured;
	UBYTE				lightLevel;
#endif
	UBYTE				DDrawDriverName[256];
	UBYTE				D3DDriverName[256];
} RENDER_STATE;

/***************************************************************************/
/*
 *	Local Variables
 */
/***************************************************************************/

RENDER_STATE	rendStates;

/***************************************************************************/
/*
 *	Local ProtoTypes
 */
/***************************************************************************/
static void pie_SetColourCombine(COLOUR_MODE colCombMode);
static void pie_SetTexCombine(TEX_MODE texCombMode);
static void pie_SetAlphaCombine(ALPHA_MODE alphaCombMode);
static void pie_SetTranslucencyMode(TRANSLUCENCY_MODE transMode);
//static void pie_SetAlphaCombine(BOOL trans);

/***************************************************************************/
/*
 *	Source
 */
/***************************************************************************/
void pie_SetDefaultStates(void)//Sets all states
{
//		pie_SetFogColour(0x00B08f5f);//nicks colour
	//fog off
	rendStates.fogEnabled = FALSE;// enable fog before renderer
	rendStates.fog = FALSE;//to force reset to false
	pie_SetFogStatus(FALSE);
	pie_SetFogColour(0x00000000);//nicks colour

	//depth Buffer on
	rendStates.depthBuffer = FALSE;//to force reset to true
	pie_SetDepthBufferStatus(DEPTH_CMP_LEQ_WRT_ON);

	//set render mode
	pie_SetTranslucent(TRUE);
	pie_SetAdditive(TRUE);
	
	//basic gouraud textured rendering
	rendStates.texCombine = TEX_NONE;//to force reset to GOURAUD_TEX
	pie_SetTexCombine(TEX_LOCAL);
	rendStates.colourCombine = COLOUR_FLAT_CONSTANT;//to force reset to GOURAUD_TEX
	pie_SetColourCombine(COLOUR_TEX_ITERATED);
	rendStates.alphaCombine = ALPHA_ITERATED;//to force reset to GOURAUD_TEX
	pie_SetAlphaCombine(ALPHA_CONSTANT);
	rendStates.transMode = TRANS_ALPHA;//to force reset to DECAL
	pie_SetTranslucencyMode(TRANS_DECAL);

	//chroma keying on black
	rendStates.keyingOn = FALSE;//to force reset to true
	pie_SetColourKeyedBlack(TRUE);

	//bilinear filtering
	rendStates.bilinearOn = FALSE;//to force reset to true
	pie_SetBilinear(TRUE);
}

/***************************************************************************/
/***************************************************************************/
void pie_ResetStates(void)//Sets all states
{
	SDWORD		temp;

//		pie_SetFogColour(0x00B08f5f);//nicks colour
	rendStates.fog = !rendStates.fog;//to force reset
	pie_SetFogStatus(!rendStates.fog);

	//depth Buffer on
	temp = rendStates.depthBuffer;
	rendStates.depthBuffer = -1;//to force reset
	pie_SetDepthBufferStatus(temp);

	//set render mode
//	pie_SetTranslucent(TRUE);
//	pie_SetAdditive(TRUE);
	
	//basic gouraud textured rendering
	temp = rendStates.texCombine;
	rendStates.texCombine = -1;//to force reset
	pie_SetTexCombine(temp);

	temp = rendStates.colourCombine;
	rendStates.colourCombine = -1;//to force reset
	pie_SetColourCombine(temp);

	temp = rendStates.alphaCombine;
	rendStates.alphaCombine = -1;//to force reset
	pie_SetAlphaCombine(temp);

	temp = rendStates.transMode;
	rendStates.transMode = -1;//to force reset
	pie_SetTranslucencyMode(temp);

	//chroma keying on black
	temp = rendStates.keyingOn;
	rendStates.keyingOn = -1;//to force reset
	pie_SetColourKeyedBlack(temp);

	//bilinear filtering
	temp = rendStates.bilinearOn;
	rendStates.bilinearOn = -1;//to force reset
	pie_SetBilinear(temp);
}

/***************************************************************************/
/***************************************************************************/

void pie_SetRenderEngine(REND_ENGINE rendEngine) {
//	printf("renderstate is (old)%d (new)%d\n",rendStates.rendEngine,rendEngine);	//Quick check to see what we using. -Q
	rendStates.rendEngine = rendEngine;
}

REND_ENGINE pie_GetRenderEngine(void) {
//	printf("renderstate is :%d\n",rendStates.rendEngine);		//Quick check to see what we are using -Q
	return rendStates.rendEngine;
}

BOOL	pie_Hardware(void) {
	return TRUE;
}

/***************************************************************************/
/***************************************************************************/

void pie_SetDepthBufferStatus(DEPTH_MODE depthMode) {
	switch(depthMode) {
		case DEPTH_CMP_LEQ_WRT_ON:
			glEnable(GL_DEPTH_TEST);
			glDepthFunc(GL_LEQUAL);
			glDepthMask(GL_TRUE);
			break;
		case DEPTH_CMP_ALWAYS_WRT_ON:
			glDisable(GL_DEPTH_TEST);
			glDepthMask(GL_TRUE);
			break;
		case DEPTH_CMP_LEQ_WRT_OFF:
			glEnable(GL_DEPTH_TEST);
			glDepthFunc(GL_LEQUAL);
			glDepthMask(GL_FALSE);
			break;
		case DEPTH_CMP_ALWAYS_WRT_OFF:
			glDisable(GL_DEPTH_TEST);
			glDepthMask(GL_FALSE);
			break;
	}
}

//***************************************************************************
//
// pie_SetTranslucent(BOOL val);
//
// Global enable/disable Translucent effects 
//
//***************************************************************************

void pie_SetTranslucent(BOOL val)
{
	rendStates.translucent = val;
}

BOOL pie_Translucent(void)
{
	return rendStates.translucent;
}

//***************************************************************************
//
// pie_SetAdditive(BOOL val);
//
// Global enable/disable Additive effects 
//
//***************************************************************************

void pie_SetAdditive(BOOL val)
{
	rendStates.additive = val;
}

BOOL pie_Additive(void)
{
	return rendStates.additive;
}

//***************************************************************************
//
// pie_SetCaps(BOOL val);
//
// HIGHEST LEVEL enable/disable modes 
//
//***************************************************************************


void pie_SetFogCap(FOG_CAP val)
{
	rendStates.fogCap = val;
}

FOG_CAP pie_GetFogCap(void)
{
	return rendStates.fogCap;
}

void pie_SetTexCap(TEX_CAP val)
{
	rendStates.texCap = val;
}

TEX_CAP pie_GetTexCap(void)
{
	return rendStates.texCap;
}

//***************************************************************************
//
// pie_EnableFog(BOOL val)
//
// Global enable/disable fog to allow fog to be turned of ingame 
//
//***************************************************************************

void pie_EnableFog(BOOL val)
{
	if (rendStates.fogCap == FOG_CAP_NO)
	{
		val = FALSE;
	}
	if (rendStates.fogEnabled != val)
	{
		rendStates.fogEnabled = val;
		if (val == TRUE)
		{
//			pie_SetFogColour(0x0078684f);//(nicks colour + 404040)/2
			pie_SetFogColour(0x00B08f5f);//nicks colour
		}
		else
		{
			pie_SetFogColour(0x00000000);//clear background to black
		}

	}
}

BOOL pie_GetFogEnabled(void)
{
	return  rendStates.fogEnabled;
}

//***************************************************************************
//
// pie_SetFogStatus(BOOL val)
//
// Toggle fog on and off for rendering objects inside or outside the 3D world
//
//***************************************************************************

void pie_SetFogStatus(BOOL val)
{
	PIELIGHT fog;
	float fog_colour[4];

	if (rendStates.fogEnabled)
	{
		//fog enabled so toggle if required 
		if (rendStates.fog != val)
		{
			rendStates.fog = val;

			if (rendStates.fog) {
				fog.argb = pie_GetFogColour();
				fog_colour[0] = fog.byte.r/255.0;
				fog_colour[1] = fog.byte.g/255.0;
				fog_colour[2] = fog.byte.b/255.0;
				fog_colour[3] = fog.byte.a/255.0;

				glFogi(GL_FOG_MODE, GL_LINEAR);
				glFogfv(GL_FOG_COLOR, fog_colour);
				glFogf(GL_FOG_DENSITY, 0.35f);
				glHint(GL_FOG_HINT, GL_DONT_CARE);
				glFogf(GL_FOG_START, 5000.0f);
				glFogf(GL_FOG_END, 7000.0f);
				glEnable(GL_FOG);
			} else {
				glDisable(GL_FOG);
			}
		}
	}
	else
	{
		//fog disabled so turn it off if not off already 
		if (rendStates.fog != FALSE)
		{
			rendStates.fog = FALSE;
		}
	}
}

BOOL pie_GetFogStatus(void)
{
	return  rendStates.fog;
}
/***************************************************************************/
void pie_SetFogColour(UDWORD colour)
{
	UDWORD grey;
 	if (rendStates.fogCap == FOG_CAP_GREY)
	{
		grey = colour & 0xff;
		colour >>= 8;
		grey += (colour & 0xff);
		colour >>= 8;
		grey += (colour & 0xff);
		grey /= 3;
		grey &= 0xff;//check only
		colour = grey + (grey<<8) + (grey<<16);
		rendStates.fogColour = colour;
	}
	else if (rendStates.fogCap == FOG_CAP_NO)
	{
		rendStates.fogColour = 0;
	}
	else
	{
		rendStates.fogColour = colour;
	}
}

UDWORD pie_GetFogColour(void)
{
	return rendStates.fogColour;
}
/***************************************************************************/
void pie_SetTexturePage(SDWORD num)
{
#ifndef PIETOOL
	if (num != rendStates.texPage) {
		rendStates.texPage = num;
		if (num < 0) {
			glDisable(GL_TEXTURE_2D);
		} else {
			glEnable(GL_TEXTURE_2D);
			glBindTexture(GL_TEXTURE_2D, _TEX_PAGE[num].textPage3dfx);
		}
	}
#endif
}

/***************************************************************************/
void pie_SetRendMode(REND_MODE rendMode)
{
	if (rendMode != rendStates.rendMode)
	{
		rendStates.rendMode = rendMode;
		switch (rendMode)
		{
			case REND_GOURAUD_TEX:
				pie_SetColourCombine(COLOUR_TEX_ITERATED);
				pie_SetTexCombine(TEX_LOCAL);
				pie_SetAlphaCombine(ALPHA_CONSTANT);
				pie_SetTranslucencyMode(TRANS_DECAL);
				break;
			case REND_ALPHA_TEX:
				pie_SetColourCombine(COLOUR_TEX_ITERATED);
				pie_SetTexCombine(TEX_LOCAL);
				pie_SetAlphaCombine(ALPHA_ITERATED);
				pie_SetTranslucencyMode(TRANS_ALPHA);
				break;
			case REND_ADDITIVE_TEX:
				pie_SetColourCombine(COLOUR_TEX_ITERATED);
				pie_SetTexCombine(TEX_LOCAL);
				pie_SetAlphaCombine(ALPHA_ITERATED);
				pie_SetTranslucencyMode(TRANS_ADDITIVE);
				break;
			case REND_TEXT:
				pie_SetColourCombine(COLOUR_TEX_CONSTANT);
				pie_SetTexCombine(TEX_LOCAL);
				pie_SetAlphaCombine(ALPHA_CONSTANT);
				pie_SetTranslucencyMode(TRANS_DECAL);
				break;
			case REND_ALPHA_TEXT:
				pie_SetColourCombine(COLOUR_TEX_CONSTANT);
				pie_SetTexCombine(TEX_LOCAL);
				pie_SetAlphaCombine(ALPHA_CONSTANT);
				pie_SetTranslucencyMode(TRANS_ALPHA);
				break;
			case REND_ALPHA_FLAT:
				pie_SetColourCombine(COLOUR_FLAT_CONSTANT);
				pie_SetTexCombine(TEX_LOCAL);
				pie_SetAlphaCombine(ALPHA_CONSTANT);
				pie_SetTranslucencyMode(TRANS_ALPHA);
				break;
			case REND_ALPHA_ITERATED:
				pie_SetColourCombine(COLOUR_FLAT_ITERATED);
				pie_SetTexCombine(TEX_LOCAL);
				pie_SetAlphaCombine(ALPHA_ITERATED);
				pie_SetTranslucencyMode(TRANS_ADDITIVE);
				break;
		   	case REND_FILTER_FLAT:
				pie_SetColourCombine(COLOUR_FLAT_CONSTANT);
				pie_SetTexCombine(TEX_LOCAL);
				pie_SetAlphaCombine(ALPHA_CONSTANT);
				pie_SetTranslucencyMode(TRANS_FILTER);
				break;
			case REND_FILTER_ITERATED:
				pie_SetColourCombine(COLOUR_FLAT_CONSTANT);
				pie_SetTexCombine(TEX_LOCAL);
				pie_SetAlphaCombine(ALPHA_ITERATED);
				pie_SetTranslucencyMode(TRANS_ALPHA);
				break;
			case REND_FLAT:
				pie_SetColourCombine(COLOUR_FLAT_CONSTANT);
				pie_SetTexCombine(TEX_LOCAL);
				pie_SetAlphaCombine(ALPHA_CONSTANT);
				pie_SetTranslucencyMode(TRANS_DECAL);
			default:
				break;
		}
	}
	return;
}

/***************************************************************************/

void pie_SetColourKeyedBlack(BOOL keyingOn)
{
#ifndef PIETOOL
	if (keyingOn != rendStates.keyingOn)
	{
		rendStates.keyingOn = keyingOn;
		pieStateCount++;

		if (keyingOn == TRUE) {
			glEnable(GL_ALPHA_TEST);
			glAlphaFunc(GL_GREATER, 0.1);
		} else {
			glDisable(GL_ALPHA_TEST);
		}
	}
#endif
}

/***************************************************************************/
void pie_SetBilinear(BOOL bilinearOn)
{
#ifndef PIETOOL
	if (bilinearOn != rendStates.bilinearOn)
	{
		rendStates.bilinearOn = bilinearOn;
		pieStateCount++;
	}
#endif
}

BOOL pie_GetBilinear(void)
{
#ifndef PIETOOL
	return rendStates.bilinearOn;
#else
	return FALSE;
#endif
}

/***************************************************************************/
static void pie_SetColourCombine(COLOUR_MODE colCombMode)
{
#ifndef PIETOOL	//ffs

	if (colCombMode != rendStates.colourCombine) {
		rendStates.colourCombine = colCombMode;
		pieStateCount++;
		switch (colCombMode) {
			case COLOUR_TEX_CONSTANT:
				break;
			case COLOUR_FLAT_CONSTANT:
			case COLOUR_FLAT_ITERATED:
				pie_SetTexturePage(-1);
				break;
			case COLOUR_TEX_ITERATED:
			default:
				break;
		}
	}
#endif
}

/***************************************************************************/
static void pie_SetTexCombine(TEX_MODE texCombMode)
{
#ifndef PIETOOL	//ffs
	if (texCombMode != rendStates.texCombine)
	{
		rendStates.texCombine = texCombMode;
		pieStateCount++;
	}
#endif
}

/***************************************************************************/
static void pie_SetAlphaCombine(ALPHA_MODE alphaCombMode)
{
#ifndef PIETOOL	//ffs
	if (alphaCombMode != rendStates.alphaCombine)
	{
		rendStates.alphaCombine = alphaCombMode;
		pieStateCount++;
	}
#endif
}

/***************************************************************************/
static void pie_SetTranslucencyMode(TRANSLUCENCY_MODE transMode)
{
#ifndef PIETOOL
	if (transMode != rendStates.transMode) {
		rendStates.transMode = transMode;
		switch (transMode) {
			case TRANS_ALPHA:
				glEnable(GL_BLEND);
				glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
				break;
			case TRANS_ADDITIVE:
				glEnable(GL_BLEND);
				glBlendFunc(GL_SRC_ALPHA, GL_ONE);
				break;
			case TRANS_FILTER:						
				glEnable(GL_BLEND);
				glBlendFunc(GL_SRC_ALPHA, GL_SRC_COLOR);
				break;
			default:
				rendStates.transMode = TRANS_DECAL;
				glDisable(GL_BLEND);
				break;
		}
	}
#endif
}

/***************************************************************************/
// set the constant colour used in text and flat render modes
/***************************************************************************/
void pie_SetColour(UDWORD colour)
{
	if (colour != rendStates.colour) {
		PIELIGHT c;

		rendStates.colour = colour;
		pieStateCount++;

		c.argb = colour;
		glColor4ub(c.byte.r, c.byte.g, c.byte.b, c.byte.a);
	}
}

/***************************************************************************/
// get the constant colour used in text and flat render modes
/***************************************************************************/
UDWORD pie_GetColour(void)
{
	return	rendStates.colour;
}

/***************************************************************************/
void pie_SetGammaValue(float val)
{
}

/***************************************************************************/
void pie_DrawMouse(SDWORD x,SDWORD y)
{
}

/***************************************************************************/
UWORD	presentMouseID;
void pie_SetMouse(IMAGEFILE *psImageFile,UWORD ImageID)
{
	presentMouseID = ImageID;
}

/***************************************************************************/
UDWORD	pie_GetMouseID( void )
{
	return(presentMouseID);
}
/***************************************************************************/
BOOL	pie_SwirlyBoxes( void )
{
	return(bSwirls);
}

void	pie_SetSwirlyBoxes( BOOL val )
{
	bSwirls = val;
}

BOOL	pie_WaveBlit( void )
{
	return(bWave);
}

void	pie_SetWaveBlit( BOOL val )
{
	bWave = val;
}
/***************************************************************************/
/***************************************************************************/
/***************************************************************************/
/***************************************************************************/
/***************************************************************************/
/***************************************************************************/
/***************************************************************************/
/***************************************************************************/
/***************************************************************************/
/***************************************************************************/