gamma_state.c

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interacti

	    break;
	case GL_DIFFUSE:
	    CHECK_DMA_BUFFER(gmesa, 3);
	    /* We don't do alpha */
	    WRITEF(gmesa->buf, Light0DiffuseIntensityBlue, params[2]);
	    WRITEF(gmesa->buf, Light0DiffuseIntensityGreen, params[1]);
	    WRITEF(gmesa->buf, Light0DiffuseIntensityRed, params[0]);
	    break;
	case GL_SPECULAR:
	    CHECK_DMA_BUFFER(gmesa, 3);
	    /* We don't do alpha */
	    WRITEF(gmesa->buf, Light0SpecularIntensityBlue, params[2]);
	    WRITEF(gmesa->buf, Light0SpecularIntensityGreen, params[1]);
	    WRITEF(gmesa->buf, Light0SpecularIntensityRed, params[0]);
	    break;
	case GL_POSITION:
    	    /* Normalize <x,y,z> */
	    x = params[0]; y = params[1]; z = params[2]; w = params[3];
	    l = sqrt(x*x + y*y + z*z + w*w);
	    w /= l;
	    x /= l;
	    y /= l;
	    z /= l;
	    if (params[3] != 0.0) {
		gmesa->Light0Mode |= Light0ModeAttenuation;
		gmesa->Light0Mode |= Light0ModeLocal;
	    } else {
		gmesa->Light0Mode &= ~Light0ModeAttenuation;
		gmesa->Light0Mode &= ~Light0ModeLocal;
	    }
	    CHECK_DMA_BUFFER(gmesa, 5);
	    WRITE(gmesa->buf, Light0Mode, gmesa->Light0Mode);
	    WRITEF(gmesa->buf, Light0PositionW, w);
	    WRITEF(gmesa->buf, Light0PositionZ, z);
	    WRITEF(gmesa->buf, Light0PositionY, y);
	    WRITEF(gmesa->buf, Light0PositionX, x);
	    break;
	case GL_SPOT_DIRECTION:
	    CHECK_DMA_BUFFER(gmesa, 3);
	    /* WRITEF(gmesa->buf, Light0SpotlightDirectionW, params[3]); */
	    WRITEF(gmesa->buf, Light0SpotlightDirectionZ, params[2]);
	    WRITEF(gmesa->buf, Light0SpotlightDirectionY, params[1]);
	    WRITEF(gmesa->buf, Light0SpotlightDirectionX, params[0]);
	    break;
	case GL_SPOT_EXPONENT:
	    CHECK_DMA_BUFFER(gmesa, 1);
	    WRITEF(gmesa->buf, Light0SpotlightExponent, params[0]);
	    break;
	case GL_SPOT_CUTOFF:
	    if (params[0] != 180.0) 
		gmesa->Light0Mode |= Light0ModeSpotLight;
	    else
		gmesa->Light0Mode &= ~Light0ModeSpotLight;
	    CHECK_DMA_BUFFER(gmesa, 2);
	    WRITE(gmesa->buf, Light0Mode, gmesa->Light0Mode);
	    WRITEF(gmesa->buf, Light0CosSpotlightCutoffAngle, cos(params[0]*DEG2RAD));
	    break;
	case GL_CONSTANT_ATTENUATION:
	    CHECK_DMA_BUFFER(gmesa, 1);
	    WRITEF(gmesa->buf, Light0ConstantAttenuation, params[0]);
	    break;
	case GL_LINEAR_ATTENUATION:
	    CHECK_DMA_BUFFER(gmesa, 1);
	    WRITEF(gmesa->buf, Light0LinearAttenuation, params[0]);
	    break;
	case GL_QUADRATIC_ATTENUATION:
	    CHECK_DMA_BUFFER(gmesa, 1);
	    WRITEF(gmesa->buf, Light0QuadraticAttenuation, params[0]);
	    break;
	}
	break;
    }
}

static void gammaDDLightModelfv( GLcontext *ctx, GLenum pname,
				const GLfloat *params )
{
   gammaContextPtr gmesa = GAMMA_CONTEXT(ctx);

   switch (pname) {
   case GL_LIGHT_MODEL_AMBIENT:
	CHECK_DMA_BUFFER(gmesa, 3);
	/* We don't do alpha */
	WRITEF(gmesa->buf, SceneAmbientColorBlue, params[2]);
	WRITEF(gmesa->buf, SceneAmbientColorGreen, params[1]);
	WRITEF(gmesa->buf, SceneAmbientColorRed, params[0]);
	break;
    case GL_LIGHT_MODEL_LOCAL_VIEWER:
	if (params[0] != 0.0)
	    gmesa->LightingMode |= LightingModeLocalViewer;
	else
	    gmesa->LightingMode &= ~LightingModeLocalViewer;
	CHECK_DMA_BUFFER(gmesa, 1);
	WRITE(gmesa->buf, LightingMode, gmesa->LightingMode);
	break;
    case GL_LIGHT_MODEL_TWO_SIDE:
	if (params[0] == 1.0f) {
	    gmesa->LightingMode |= LightingModeTwoSides;
	    gmesa->MaterialMode |= MaterialModeTwoSides;
	} else {
	    gmesa->LightingMode &= ~LightingModeTwoSides;
	    gmesa->MaterialMode &= ~MaterialModeTwoSides;
	}
	CHECK_DMA_BUFFER(gmesa, 2);
	WRITE(gmesa->buf, LightingMode, gmesa->LightingMode);
	WRITE(gmesa->buf, MaterialMode, gmesa->MaterialMode);
	break;
    }
}
#endif

static void gammaDDShadeModel( GLcontext *ctx, GLenum mode )
{
   gammaContextPtr gmesa = GAMMA_CONTEXT(ctx);
   u_int32_t g = gmesa->GeometryMode;
   u_int32_t c = gmesa->ColorDDAMode;

   g &= ~GM_ShadingMask;
   c &= ~ColorDDAShadingMask;

   switch ( mode ) {
   case GL_FLAT:
      g |= GM_FlatShading;
      c |= ColorDDAFlat;
      break;
   case GL_SMOOTH:
      g |= GM_GouraudShading;
      c |= ColorDDAGouraud;
      break;
   default:
      return;
   }

   if ( gmesa->ColorDDAMode != c ) {
      FLUSH_BATCH( gmesa );
      gmesa->ColorDDAMode = c;

      gmesa->dirty |= GAMMA_UPLOAD_SHADE;
   }

   if ( gmesa->GeometryMode != g ) {
      FLUSH_BATCH( gmesa );
      gmesa->GeometryMode = g;

      gmesa->dirty |= GAMMA_UPLOAD_GEOMETRY;
   }
}

/* =============================================================
 * Miscellaneous
 */

static void gammaDDClearColor( GLcontext *ctx, const GLfloat color[4])
{
   gammaContextPtr gmesa = GAMMA_CONTEXT(ctx);
   GLubyte c[4];
   UNCLAMPED_FLOAT_TO_UBYTE(c[0], color[0]);
   UNCLAMPED_FLOAT_TO_UBYTE(c[1], color[1]);
   UNCLAMPED_FLOAT_TO_UBYTE(c[2], color[2]);
   UNCLAMPED_FLOAT_TO_UBYTE(c[3], color[3]);

   gmesa->ClearColor = gammaPackColor( gmesa->gammaScreen->cpp,
                                       c[0], c[1], c[2], c[3] );

   if (gmesa->gammaScreen->cpp == 2) gmesa->ClearColor |= gmesa->ClearColor<<16;
}


static void gammaDDLogicalOpcode( GLcontext *ctx, GLenum opcode )
{
   gammaContextPtr gmesa = GAMMA_CONTEXT(ctx);

   FLUSH_BATCH( gmesa );

   if ( ctx->Color.ColorLogicOpEnabled ) {
      gmesa->LogicalOpMode = opcode << 1 | LogicalOpModeEnable;
   } else {
      gmesa->LogicalOpMode = LogicalOpModeDisable;
   }

   gmesa->dirty |= GAMMA_UPLOAD_LOGICOP;
}

static void gammaDDDrawBuffer( GLcontext *ctx, GLenum mode )
{
   gammaContextPtr gmesa = GAMMA_CONTEXT(ctx);

   FLUSH_BATCH( gmesa );

   switch ( mode ) {
   case GL_FRONT_LEFT:
      gmesa->drawOffset = gmesa->readOffset = 0;
      break;
   case GL_BACK_LEFT:
      gmesa->drawOffset = gmesa->readOffset = gmesa->driScreen->fbHeight * gmesa->driScreen->fbWidth * gmesa->gammaScreen->cpp; 
      break;
   }
}

static void gammaDDReadBuffer( GLcontext *ctx, GLenum mode )
{
   /* XXX anything? */
}

/* =============================================================
 * Window position and viewport transformation
 */

void gammaUpdateWindow( GLcontext *ctx )
{
   gammaContextPtr gmesa = GAMMA_CONTEXT(ctx);
   __DRIdrawablePrivate *dPriv = gmesa->driDrawable;
   GLfloat xoffset = (GLfloat)dPriv->x;
   GLfloat yoffset = gmesa->driScreen->fbHeight - (GLfloat)dPriv->y - dPriv->h;
   const GLfloat *v = ctx->Viewport._WindowMap.m;

   GLfloat sx = v[MAT_SX];
   GLfloat tx = v[MAT_TX] + xoffset;
   GLfloat sy = v[MAT_SY];
   GLfloat ty = v[MAT_TY] + yoffset;
   GLfloat sz = v[MAT_SZ] * gmesa->depth_scale;
   GLfloat tz = v[MAT_TZ] * gmesa->depth_scale;

   gmesa->dirty |= GAMMA_UPLOAD_VIEWPORT;

   gmesa->ViewportScaleX = sx;
   gmesa->ViewportScaleY = sy;
   gmesa->ViewportScaleZ = sz;
   gmesa->ViewportOffsetX = tx;
   gmesa->ViewportOffsetY = ty;
   gmesa->ViewportOffsetZ = tz;
}



static void gammaDDViewport( GLcontext *ctx, GLint x, GLint y,
			    GLsizei width, GLsizei height )
{
   gammaUpdateWindow( ctx );
}

static void gammaDDDepthRange( GLcontext *ctx, GLclampd nearval,
			      GLclampd farval )
{
   gammaUpdateWindow( ctx );
}

void gammaUpdateViewportOffset( GLcontext *ctx )
{
   gammaContextPtr gmesa = GAMMA_CONTEXT(ctx);
   __DRIdrawablePrivate *dPriv = gmesa->driDrawable;
   GLfloat xoffset = (GLfloat)dPriv->x;
   GLfloat yoffset = gmesa->driScreen->fbHeight - (GLfloat)dPriv->y - dPriv->h;
   const GLfloat *v = ctx->Viewport._WindowMap.m;

   GLfloat tx = v[MAT_TX] + xoffset;
   GLfloat ty = v[MAT_TY] + yoffset;

   if ( gmesa->ViewportOffsetX != tx ||
        gmesa->ViewportOffsetY != ty )
   {
      gmesa->ViewportOffsetX = tx;
      gmesa->ViewportOffsetY = ty;

      gmesa->new_state |= GAMMA_NEW_WINDOW;
   }

   gmesa->new_state |= GAMMA_NEW_CLIP;
}

#if 0
/* 
 * Matrix 
 */

static void gammaLoadHWMatrix(GLcontext *ctx)
{
    gammaContextPtr gmesa = GAMMA_CONTEXT(ctx);
    const GLfloat *m;

    gmesa->TransformMode &= ~XM_XformTexture;

    switch (ctx->Transform.MatrixMode) {
    case GL_MODELVIEW:
	gmesa->TransformMode |= XM_UseModelViewMatrix;
        m = ctx->ModelviewMatrixStack.Top->m;
	CHECK_DMA_BUFFER(gmesa, 16);
	WRITEF(gmesa->buf, ModelViewMatrix0,  m[0]);
	WRITEF(gmesa->buf, ModelViewMatrix1,  m[1]);
	WRITEF(gmesa->buf, ModelViewMatrix2,  m[2]);
	WRITEF(gmesa->buf, ModelViewMatrix3,  m[3]);
	WRITEF(gmesa->buf, ModelViewMatrix4,  m[4]);
	WRITEF(gmesa->buf, ModelViewMatrix5,  m[5]);
	WRITEF(gmesa->buf, ModelViewMatrix6,  m[6]);
	WRITEF(gmesa->buf, ModelViewMatrix7,  m[7]);
	WRITEF(gmesa->buf, ModelViewMatrix8,  m[8]);
	WRITEF(gmesa->buf, ModelViewMatrix9,  m[9]);
	WRITEF(gmesa->buf, ModelViewMatrix10, m[10]);
	WRITEF(gmesa->buf, ModelViewMatrix11, m[11]);
	WRITEF(gmesa->buf, ModelViewMatrix12, m[12]);
	WRITEF(gmesa->buf, ModelViewMatrix13, m[13]);
	WRITEF(gmesa->buf, ModelViewMatrix14, m[14]);
	WRITEF(gmesa->buf, ModelViewMatrix15, m[15]);
	break;
    case GL_PROJECTION:
        m = ctx->ProjectionMatrixStack.Top->m;
	CHECK_DMA_BUFFER(gmesa, 16);
	WRITEF(gmesa->buf, ModelViewProjectionMatrix0, m[0]);
	WRITEF(gmesa->buf, ModelViewProjectionMatrix1, m[1]);
	WRITEF(gmesa->buf, ModelViewProjectionMatrix2, m[2]);
	WRITEF(gmesa->buf, ModelViewProjectionMatrix3, m[3]);
	WRITEF(gmesa->buf, ModelViewProjectionMatrix4, m[4]);
	WRITEF(gmesa->buf, ModelViewProjectionMatrix5, m[5]);
	WRITEF(gmesa->buf, ModelViewProjectionMatrix6, m[6]);
	WRITEF(gmesa->buf, ModelViewProjectionMatrix7, m[7]);
	WRITEF(gmesa->buf, ModelViewProjectionMatrix8, m[8]);
	WRITEF(gmesa->buf, ModelViewProjectionMatrix9, m[9]);
	WRITEF(gmesa->buf, ModelViewProjectionMatrix10, m[10]);
	WRITEF(gmesa->buf, ModelViewProjectionMatrix11, m[11]);
	WRITEF(gmesa->buf, ModelViewProjectionMatrix12, m[12]);
	WRITEF(gmesa->buf, ModelViewProjectionMatrix13, m[13]);
	WRITEF(gmesa->buf, ModelViewProjectionMatrix14, m[14]);
	WRITEF(gmesa->buf, ModelViewProjectionMatrix15, m[15]);
	break;
    case GL_TEXTURE:
        m = ctx->TextureMatrixStack[0].Top->m;
	CHECK_DMA_BUFFER(gmesa, 16);
	gmesa->TransformMode |= XM_XformTexture;
	WRITEF(gmesa->buf, TextureMatrix0,  m[0]);
	WRITEF(gmesa->buf, TextureMatrix1,  m[1]);
	WRITEF(gmesa->buf, TextureMatrix2,  m[2]);
	WRITEF(gmesa->buf, TextureMatrix3,  m[3]);
	WRITEF(gmesa->buf, TextureMatrix4,  m[4]);
	WRITEF(gmesa->buf, TextureMatrix5,  m[5]);
	WRITEF(gmesa->buf, TextureMatrix6,  m[6]);
	WRITEF(gmesa->buf, TextureMatrix7,  m[7]);
	WRITEF(gmesa->buf, TextureMatrix8,  m[8]);
	WRITEF(gmesa->buf, TextureMatrix9,  m[9]);
	WRITEF(gmesa->buf, TextureMatrix10,  m[10]);
	WRITEF(gmesa->buf, TextureMatrix11,  m[11]);
	WRITEF(gmesa->buf, TextureMatrix12,  m[12]);
	WRITEF(gmesa->buf, TextureMatrix13,  m[13]);
	WRITEF(gmesa->buf, TextureMatrix14,  m[14]);
	WRITEF(gmesa->buf, TextureMatrix15,  m[15]);
	break;

    default:
	/* ERROR!!! -- how did this happen? */
	break;
    }

    gmesa->dirty |= GAMMA_UPLOAD_TRANSFORM;
}
#endif

/* =============================================================
 * State enable/disable
 */

static void gammaDDEnable( GLcontext *ctx, GLenum cap, GLboolean state )
{
   gammaContextPtr gmesa = GAMMA_CONTEXT(ctx);

   switch ( cap ) {
   case GL_ALPHA_TEST:
   case GL_BLEND:
      FLUSH_BATCH( gmesa );
      gmesa->new_state |= GAMMA_NEW_ALPHA;
      break;

   case GL_CULL_FACE:
      FLUSH_BATCH( gmesa );
      gmesa->new_state |= GAMMA_NEW_CULL;
      break;

   case GL_DEPTH_TEST:
      FLUSH_BATCH( gmesa );
      gmesa->new_state |= GAMMA_NEW_DEPTH;
      break;

   case GL_DITHER:
      do {
	 u_int32_t d = gmesa->DitherMode;
	 FLUSH_BATCH( gmesa );

	 if ( state ) {
	    d |=  DM_DitherEnable;
	 } else {
	    d &= ~DM_DitherEnable;
	 }

	 if ( gmesa->DitherMode != d ) {
	    gmesa->DitherMode = d;
	    gmesa->dirty |= GAMMA_UPLOAD_DITHER;
	 }
      } while (0);
      break;

#if 0
   case GL_FOG:
      FLUSH_BATCH( gmesa );
      gmesa->new_state |= GAMMA_NEW_FOG;
      break;
#endif

   case GL_INDEX_LOGIC_OP:
   case GL_COLOR_LOGIC_OP:
      FLUSH_BATCH( gmesa );
      gmesa->new_state |= GAMMA_NEW_LOGICOP;
      break;

#if ENABLELIGHTING
   case GL_LIGHTING:
      do {
	 u_int32_t l = gmesa->LightingMode;
	 FLUSH_BATCH( gmesa );

	 if ( state ) {
	    l |=  LightingModeEnable;
	 } else {
	    l &= ~LightingModeEnable;
	 }

	 if ( gmesa->LightingMode != l ) {
	    gmesa->LightingMode = l;
	    gmesa->dirty |= GAMMA_UPLOAD_LIGHT;
	 }
      } while (0);
      break;

   case GL_COLOR_MATERIAL: