r300_state.c

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

			(char *)ctx->FragmentProgram._Current;
		return (fp && fp->WritesDepth);
	} else {
		struct r500_fragment_program* fp =
			(struct r500_fragment_program*)(char*)
			ctx->FragmentProgram._Current;
		return (fp && fp->writes_depth);
	}
}

static void r300SetEarlyZState(GLcontext * ctx)
{
	r300ContextPtr r300 = R300_CONTEXT(ctx);
	GLuint topZ = R300_ZTOP_ENABLE;

	if (ctx->Color.AlphaEnabled && ctx->Color.AlphaFunc != GL_ALWAYS)
		topZ = R300_ZTOP_DISABLE;
	if (current_fragment_program_writes_depth(ctx))
		topZ = R300_ZTOP_DISABLE;

	if (topZ != r300->hw.zstencil_format.cmd[2]) {
		/* Note: This completely reemits the stencil format.
		 * I have not tested whether this is strictly necessary,
		 * or if emitting a write to ZB_ZTOP is enough.
		 */
		R300_STATECHANGE(r300, zstencil_format);
		r300->hw.zstencil_format.cmd[2] = topZ;
	}
}

static void r300SetAlphaState(GLcontext * ctx)
{
	r300ContextPtr r300 = R300_CONTEXT(ctx);
	GLubyte refByte;
	uint32_t pp_misc = 0x0;
	GLboolean really_enabled = ctx->Color.AlphaEnabled;

	CLAMPED_FLOAT_TO_UBYTE(refByte, ctx->Color.AlphaRef);

	switch (ctx->Color.AlphaFunc) {
	case GL_NEVER:
		pp_misc |= R300_FG_ALPHA_FUNC_NEVER;
		break;
	case GL_LESS:
		pp_misc |= R300_FG_ALPHA_FUNC_LESS;
		break;
	case GL_EQUAL:
		pp_misc |= R300_FG_ALPHA_FUNC_EQUAL;
		break;
	case GL_LEQUAL:
		pp_misc |= R300_FG_ALPHA_FUNC_LE;
		break;
	case GL_GREATER:
		pp_misc |= R300_FG_ALPHA_FUNC_GREATER;
		break;
	case GL_NOTEQUAL:
		pp_misc |= R300_FG_ALPHA_FUNC_NOTEQUAL;
		break;
	case GL_GEQUAL:
		pp_misc |= R300_FG_ALPHA_FUNC_GE;
		break;
	case GL_ALWAYS:
		/*pp_misc |= FG_ALPHA_FUNC_ALWAYS; */
		really_enabled = GL_FALSE;
		break;
	}

	if (really_enabled) {
		pp_misc |= R300_FG_ALPHA_FUNC_ENABLE;
		pp_misc |= R500_FG_ALPHA_FUNC_8BIT;
		pp_misc |= (refByte & R300_FG_ALPHA_FUNC_VAL_MASK);
	} else {
		pp_misc = 0x0;
	}

	R300_STATECHANGE(r300, at);
	r300->hw.at.cmd[R300_AT_ALPHA_TEST] = pp_misc;
	r300->hw.at.cmd[R300_AT_UNKNOWN] = 0;

	r300SetEarlyZState(ctx);
}

static void r300AlphaFunc(GLcontext * ctx, GLenum func, GLfloat ref)
{
	(void)func;
	(void)ref;
	r300SetAlphaState(ctx);
}

static int translate_func(int func)
{
	switch (func) {
	case GL_NEVER:
		return R300_ZS_NEVER;
	case GL_LESS:
		return R300_ZS_LESS;
	case GL_EQUAL:
		return R300_ZS_EQUAL;
	case GL_LEQUAL:
		return R300_ZS_LEQUAL;
	case GL_GREATER:
		return R300_ZS_GREATER;
	case GL_NOTEQUAL:
		return R300_ZS_NOTEQUAL;
	case GL_GEQUAL:
		return R300_ZS_GEQUAL;
	case GL_ALWAYS:
		return R300_ZS_ALWAYS;
	}
	return 0;
}

static void r300SetDepthState(GLcontext * ctx)
{
	r300ContextPtr r300 = R300_CONTEXT(ctx);

	R300_STATECHANGE(r300, zs);
	r300->hw.zs.cmd[R300_ZS_CNTL_0] &= R300_STENCIL_ENABLE|R300_STENCIL_FRONT_BACK;
	r300->hw.zs.cmd[R300_ZS_CNTL_1] &= ~(R300_ZS_MASK << R300_Z_FUNC_SHIFT);

	if (ctx->Depth.Test) {
		r300->hw.zs.cmd[R300_ZS_CNTL_0] |= R300_Z_ENABLE;
		if (ctx->Depth.Mask)
			r300->hw.zs.cmd[R300_ZS_CNTL_0] |= R300_Z_WRITE_ENABLE;
		r300->hw.zs.cmd[R300_ZS_CNTL_1] |=
		    translate_func(ctx->Depth.Func) << R300_Z_FUNC_SHIFT;
	}

	r300SetEarlyZState(ctx);
}

static void r300SetStencilState(GLcontext * ctx, GLboolean state)
{
	r300ContextPtr r300 = R300_CONTEXT(ctx);

	if (r300->state.stencil.hw_stencil) {
		R300_STATECHANGE(r300, zs);
		if (state) {
			r300->hw.zs.cmd[R300_ZS_CNTL_0] |=
			    R300_STENCIL_ENABLE;
		} else {
			r300->hw.zs.cmd[R300_ZS_CNTL_0] &=
			    ~R300_STENCIL_ENABLE;
		}
	} else {
#if R200_MERGED
		FALLBACK(&r300->radeon, RADEON_FALLBACK_STENCIL, state);
#endif
	}
}

static void r300UpdatePolygonMode(GLcontext * ctx)
{
	r300ContextPtr r300 = R300_CONTEXT(ctx);
	uint32_t hw_mode = R300_GA_POLY_MODE_DISABLE;

	/* Only do something if a polygon mode is wanted, default is GL_FILL */
	if (ctx->Polygon.FrontMode != GL_FILL ||
	    ctx->Polygon.BackMode != GL_FILL) {
		GLenum f, b;

		/* Handle GL_CW (clock wise and GL_CCW (counter clock wise)
		 * correctly by selecting the correct front and back face
		 */
		if (ctx->Polygon.FrontFace == GL_CCW) {
			f = ctx->Polygon.FrontMode;
			b = ctx->Polygon.BackMode;
		} else {
			f = ctx->Polygon.BackMode;
			b = ctx->Polygon.FrontMode;
		}

		/* Enable polygon mode */
		hw_mode |= R300_GA_POLY_MODE_DUAL;

		switch (f) {
		case GL_LINE:
			hw_mode |= R300_GA_POLY_MODE_FRONT_PTYPE_LINE;
			break;
		case GL_POINT:
			hw_mode |= R300_GA_POLY_MODE_FRONT_PTYPE_POINT;
			break;
		case GL_FILL:
			hw_mode |= R300_GA_POLY_MODE_FRONT_PTYPE_TRI;
			break;
		}

		switch (b) {
		case GL_LINE:
			hw_mode |= R300_GA_POLY_MODE_BACK_PTYPE_LINE;
			break;
		case GL_POINT:
			hw_mode |= R300_GA_POLY_MODE_BACK_PTYPE_POINT;
			break;
		case GL_FILL:
			hw_mode |= R300_GA_POLY_MODE_BACK_PTYPE_TRI;
			break;
		}
	}

	if (r300->hw.polygon_mode.cmd[1] != hw_mode) {
		R300_STATECHANGE(r300, polygon_mode);
		r300->hw.polygon_mode.cmd[1] = hw_mode;
	}

	r300->hw.polygon_mode.cmd[2] = 0x00000001;
	r300->hw.polygon_mode.cmd[3] = 0x00000000;
}

/**
 * Change the culling mode.
 *
 * \note Mesa already filters redundant calls to this function.
 */
static void r300CullFace(GLcontext * ctx, GLenum mode)
{
	(void)mode;

	r300UpdateCulling(ctx);
}

/**
 * Change the polygon orientation.
 *
 * \note Mesa already filters redundant calls to this function.
 */
static void r300FrontFace(GLcontext * ctx, GLenum mode)
{
	(void)mode;

	r300UpdateCulling(ctx);
	r300UpdatePolygonMode(ctx);
}

/**
 * Change the depth testing function.
 *
 * \note Mesa already filters redundant calls to this function.
 */
static void r300DepthFunc(GLcontext * ctx, GLenum func)
{
	(void)func;
	r300SetDepthState(ctx);
}

/**
 * Enable/Disable depth writing.
 *
 * \note Mesa already filters redundant calls to this function.
 */
static void r300DepthMask(GLcontext * ctx, GLboolean mask)
{
	(void)mask;
	r300SetDepthState(ctx);
}

/**
 * Handle glColorMask()
 */
static void r300ColorMask(GLcontext * ctx,
			  GLboolean r, GLboolean g, GLboolean b, GLboolean a)
{
	r300ContextPtr r300 = R300_CONTEXT(ctx);
	int mask = (r ? RB3D_COLOR_CHANNEL_MASK_RED_MASK0 : 0) |
	    (g ? RB3D_COLOR_CHANNEL_MASK_GREEN_MASK0 : 0) |
	    (b ? RB3D_COLOR_CHANNEL_MASK_BLUE_MASK0 : 0) |
	    (a ? RB3D_COLOR_CHANNEL_MASK_ALPHA_MASK0 : 0);

	if (mask != r300->hw.cmk.cmd[R300_CMK_COLORMASK]) {
		R300_STATECHANGE(r300, cmk);
		r300->hw.cmk.cmd[R300_CMK_COLORMASK] = mask;
	}
}

/* =============================================================
 * Fog
 */
static void r300Fogfv(GLcontext * ctx, GLenum pname, const GLfloat * param)
{
	r300ContextPtr r300 = R300_CONTEXT(ctx);
	union {
		int i;
		float f;
	} fogScale, fogStart;

	(void)param;

	fogScale.i = r300->hw.fogp.cmd[R300_FOGP_SCALE];
	fogStart.i = r300->hw.fogp.cmd[R300_FOGP_START];

	switch (pname) {
	case GL_FOG_MODE:
		switch (ctx->Fog.Mode) {
		case GL_LINEAR:
			R300_STATECHANGE(r300, fogs);
			r300->hw.fogs.cmd[R300_FOGS_STATE] =
			    (r300->hw.fogs.
			     cmd[R300_FOGS_STATE] & ~R300_FG_FOG_BLEND_FN_MASK) |
			    R300_FG_FOG_BLEND_FN_LINEAR;

			if (ctx->Fog.Start == ctx->Fog.End) {
				fogScale.f = -1.0;
				fogStart.f = 1.0;
			} else {
				fogScale.f =
				    1.0 / (ctx->Fog.End - ctx->Fog.Start);
				fogStart.f =
				    -ctx->Fog.Start / (ctx->Fog.End -
						       ctx->Fog.Start);
			}
			break;
		case GL_EXP:
			R300_STATECHANGE(r300, fogs);
			r300->hw.fogs.cmd[R300_FOGS_STATE] =
			    (r300->hw.fogs.
			     cmd[R300_FOGS_STATE] & ~R300_FG_FOG_BLEND_FN_MASK) |
			    R300_FG_FOG_BLEND_FN_EXP;
			fogScale.f = 0.0933 * ctx->Fog.Density;
			fogStart.f = 0.0;
			break;
		case GL_EXP2:
			R300_STATECHANGE(r300, fogs);
			r300->hw.fogs.cmd[R300_FOGS_STATE] =
			    (r300->hw.fogs.
			     cmd[R300_FOGS_STATE] & ~R300_FG_FOG_BLEND_FN_MASK) |
			    R300_FG_FOG_BLEND_FN_EXP2;
			fogScale.f = 0.3 * ctx->Fog.Density;
			fogStart.f = 0.0;
		default:
			return;
		}
		break;
	case GL_FOG_DENSITY:
		switch (ctx->Fog.Mode) {
		case GL_EXP:
			fogScale.f = 0.0933 * ctx->Fog.Density;
			fogStart.f = 0.0;
			break;
		case GL_EXP2:
			fogScale.f = 0.3 * ctx->Fog.Density;
			fogStart.f = 0.0;
		default:
			break;
		}
		break;
	case GL_FOG_START:
	case GL_FOG_END:
		if (ctx->Fog.Mode == GL_LINEAR) {
			if (ctx->Fog.Start == ctx->Fog.End) {
				fogScale.f = -1.0;
				fogStart.f = 1.0;
			} else {
				fogScale.f =
				    1.0 / (ctx->Fog.End - ctx->Fog.Start);
				fogStart.f =
				    -ctx->Fog.Start / (ctx->Fog.End -
						       ctx->Fog.Start);
			}
		}
		break;
	case GL_FOG_COLOR:
		R300_STATECHANGE(r300, fogc);
		r300->hw.fogc.cmd[R300_FOGC_R] =
		    (GLuint) (ctx->Fog.Color[0] * 1023.0F) & 0x3FF;
		r300->hw.fogc.cmd[R300_FOGC_G] =
		    (GLuint) (ctx->Fog.Color[1] * 1023.0F) & 0x3FF;
		r300->hw.fogc.cmd[R300_FOGC_B] =
		    (GLuint) (ctx->Fog.Color[2] * 1023.0F) & 0x3FF;
		break;
	case GL_FOG_COORD_SRC:
		break;
	default:
		return;
	}

	if (fogScale.i != r300->hw.fogp.cmd[R300_FOGP_SCALE] ||
	    fogStart.i != r300->hw.fogp.cmd[R300_FOGP_START]) {
		R300_STATECHANGE(r300, fogp);
		r300->hw.fogp.cmd[R300_FOGP_SCALE] = fogScale.i;
		r300->hw.fogp.cmd[R300_FOGP_START] = fogStart.i;
	}
}

static void r300SetFogState(GLcontext * ctx, GLboolean state)
{
	r300ContextPtr r300 = R300_CONTEXT(ctx);

	R300_STATECHANGE(r300, fogs);
	if (state) {
		r300->hw.fogs.cmd[R300_FOGS_STATE] |= R300_FG_FOG_BLEND_ENABLE;

		r300Fogfv(ctx, GL_FOG_MODE, NULL);
		r300Fogfv(ctx, GL_FOG_DENSITY, &ctx->Fog.Density);
		r300Fogfv(ctx, GL_FOG_START, &ctx->Fog.Start);
		r300Fogfv(ctx, GL_FOG_END, &ctx->Fog.End);
		r300Fogfv(ctx, GL_FOG_COLOR, ctx->Fog.Color);
	} else {
		r300->hw.fogs.cmd[R300_FOGS_STATE] &= ~R300_FG_FOG_BLEND_ENABLE;
	}
}

/* =============================================================
 * Point state
 */
static void r300PointSize(GLcontext * ctx, GLfloat size)
{
	r300ContextPtr r300 = R300_CONTEXT(ctx);
        /* same size limits for AA, non-AA points */
	size = CLAMP(size, ctx->Const.MinPointSize, ctx->Const.MaxPointSize);

	R300_STATECHANGE(r300, ps);
	r300->hw.ps.cmd[R300_PS_POINTSIZE] =
	    ((int)(size * 6) << R300_POINTSIZE_X_SHIFT) |
	    ((int)(size * 6) << R300_POINTSIZE_Y_SHIFT);
}

static void r300PointParameter(GLcontext * ctx, GLenum pname, const GLfloat * param)
{
	r300ContextPtr r300 = R300_CONTEXT(ctx);

	switch (pname) {
	case GL_POINT_SIZE_MIN:
		R300_STATECHANGE(r300, ga_point_minmax);
		r300->hw.ga_point_minmax.cmd[1] &= ~R300_GA_POINT_MINMAX_MIN_MASK;
		r300->hw.ga_point_minmax.cmd[1] |= (GLuint)(ctx->Point.MinSize * 6.0);
		break;
	case GL_POINT_SIZE_MAX:
		R300_STATECHANGE(r300, ga_point_minmax);
		r300->hw.ga_point_minmax.cmd[1] &= ~R300_GA_POINT_MINMAX_MAX_MASK;
		r300->hw.ga_point_minmax.cmd[1] |= (GLuint)(ctx->Point.MaxSize * 6.0)
			<< R300_GA_POINT_MINMAX_MAX_SHIFT;
		break;
	case GL_POINT_DISTANCE_ATTENUATION:
		break;
	case GL_POINT_FADE_THRESHOLD_SIZE:
		break;
	default:
		break;
	}
}

/* =============================================================
 * Line state
 */
static void r300LineWidth(GLcontext * ctx, GLfloat widthf)
{
	r300ContextPtr r300 = R300_CONTEXT(ctx);

	widthf = CLAMP(widthf,
                       ctx->Const.MinPointSize,
                       ctx->Const.MaxPointSize);
	R300_STATECHANGE(r300, lcntl);
	r300->hw.lcntl.cmd[1] =
	    R300_LINE_CNT_HO | R300_LINE_CNT_VE | (int)(widthf * 6.0);
}

static void r300PolygonMode(GLcontext * ctx, GLenum face, GLenum mode)