Fog support (Ewald Snel)

6 files changed, 177 insertions, 24 deletions

diff --git a/src/mesa/drivers/dri/r300/r300_cmdbuf.c b/src/mesa/drivers/dri/r300/r300_cmdbuf.c
index 09f7669bd7..320e1bd13e 100644
--- a/src/mesa/drivers/dri/r300/r300_cmdbuf.c
+++ b/src/mesa/drivers/dri/r300/r300_cmdbuf.c
@@ -337,8 +337,10 @@ void r300InitCmdBuf(r300ContextPtr r300)
 		r300->hw.unk4260.cmd[0] = cmdpacket0(0x4260, 3);
 	ALLOC_STATE( unk4274, always, 5, "unk4274", 0 );
 		r300->hw.unk4274.cmd[0] = cmdpacket0(0x4274, 4);
-	ALLOC_STATE( unk4288, always, 6, "unk4288", 0 );
-		r300->hw.unk4288.cmd[0] = cmdpacket0(0x4288, 5);
+	ALLOC_STATE( unk4288, always, 4, "unk4288", 0 );
+		r300->hw.unk4288.cmd[0] = cmdpacket0(0x4288, 3);
+	ALLOC_STATE( fogp, always, 3, "fogp", 0 );
+		r300->hw.fogp.cmd[0] = cmdpacket0(R300_RE_FOG_SCALE, 2);
 	ALLOC_STATE( unk42A0, always, 2, "unk42A0", 0 );
 		r300->hw.unk42A0.cmd[0] = cmdpacket0(0x42A0, 1);
 	ALLOC_STATE( zbs, always, R300_ZBS_CMDSIZE, "zbs", 0 );
@@ -374,10 +376,10 @@ void r300InitCmdBuf(r300ContextPtr r300)
 		r300->hw.fpi[2].cmd[R300_FPI_CMD_0] = cmdpacket0(R300_PFS_INSTR2_0, 1);
 	ALLOC_STATE( fpi[3], variable, R300_FPI_CMDSIZE, "fpi/3", 3 );
 		r300->hw.fpi[3].cmd[R300_FPI_CMD_0] = cmdpacket0(R300_PFS_INSTR3_0, 1);
-	ALLOC_STATE( unk4BC0, always, 2, "unk4BC0", 0 );
-		r300->hw.unk4BC0.cmd[0] = cmdpacket0(0x4BC0, 1);
-	ALLOC_STATE( unk4BC8, always, 4, "unk4BC8", 0 );
-		r300->hw.unk4BC8.cmd[0] = cmdpacket0(0x4BC8, 3);
+	ALLOC_STATE( fogs, always, R300_FOGS_CMDSIZE, "fogs", 0 );
+		r300->hw.fogs.cmd[R300_FOGS_CMD_0] = cmdpacket0(R300_RE_FOG_STATE, 1);
+	ALLOC_STATE( fogc, always, R300_FOGC_CMDSIZE, "fogc", 0 );
+		r300->hw.fogc.cmd[R300_FOGC_CMD_0] = cmdpacket0(R300_FOG_COLOR_R, 3);
 	ALLOC_STATE( at, always, R300_AT_CMDSIZE, "at", 0 );
 		r300->hw.at.cmd[R300_AT_CMD_0] = cmdpacket0(R300_PP_ALPHA_TEST, 2);
 	ALLOC_STATE( unk4BD8, always, 2, "unk4BD8", 0 );
@@ -478,6 +480,7 @@ void r300InitCmdBuf(r300ContextPtr r300)
 	insert_at_tail(&r300->hw.atomlist, &r300->hw.unk4260);
 	insert_at_tail(&r300->hw.atomlist, &r300->hw.unk4274);
 	insert_at_tail(&r300->hw.atomlist, &r300->hw.unk4288);
+	insert_at_tail(&r300->hw.atomlist, &r300->hw.fogp);
 	insert_at_tail(&r300->hw.atomlist, &r300->hw.unk42A0);
 	insert_at_tail(&r300->hw.atomlist, &r300->hw.zbs);
 	insert_at_tail(&r300->hw.atomlist, &r300->hw.unk42B4);
@@ -495,8 +498,8 @@ void r300InitCmdBuf(r300ContextPtr r300)
 	insert_at_tail(&r300->hw.atomlist, &r300->hw.fpi[1]);
 	insert_at_tail(&r300->hw.atomlist, &r300->hw.fpi[2]);
 	insert_at_tail(&r300->hw.atomlist, &r300->hw.fpi[3]);
-	insert_at_tail(&r300->hw.atomlist, &r300->hw.unk4BC0);
-	insert_at_tail(&r300->hw.atomlist, &r300->hw.unk4BC8);
+	insert_at_tail(&r300->hw.atomlist, &r300->hw.fogs);
+	insert_at_tail(&r300->hw.atomlist, &r300->hw.fogc);
 	insert_at_tail(&r300->hw.atomlist, &r300->hw.at);
 	insert_at_tail(&r300->hw.atomlist, &r300->hw.unk4BD8);
 	insert_at_tail(&r300->hw.atomlist, &r300->hw.fpp);
diff --git a/src/mesa/drivers/dri/r300/r300_context.h b/src/mesa/drivers/dri/r300/r300_context.h
index 176341d771..449459b5b1 100644
--- a/src/mesa/drivers/dri/r300/r300_context.h
+++ b/src/mesa/drivers/dri/r300/r300_context.h
@@ -346,6 +346,21 @@ struct r300_state_atom {
 #define R300_FPP_PARAM_0	1
 #define R300_FPP_CMDSIZE	(32*4+1)
 
+#define R300_FOGS_CMD_0		0
+#define R300_FOGS_STATE		1
+#define R300_FOGS_CMDSIZE	2
+
+#define R300_FOGC_CMD_0		0
+#define R300_FOGC_R		1
+#define R300_FOGC_G		2
+#define R300_FOGC_B		3
+#define R300_FOGC_CMDSIZE	4
+
+#define R300_FOGP_CMD_0		0
+#define R300_FOGP_SCALE		1
+#define R300_FOGP_START		2
+#define R300_FOGP_CMDSIZE	3
+
 #define R300_AT_CMD_0		0
 #define R300_AT_ALPHA_TEST	1
 #define R300_AT_UNKNOWN		2
@@ -432,6 +447,8 @@ struct r300_hw_state {
 	struct r300_state_atom unk4260; /* (4260) */
 	struct r300_state_atom unk4274; /* (4274) */
 	struct r300_state_atom unk4288; /* (4288) */
+	struct r300_state_atom fogp;	/* fog parameters (4294) */
+	struct r300_state_atom unk429C; /* (429C) */
 	struct r300_state_atom unk42A0;	/* (42A0) */
 	struct r300_state_atom zbs;	/* zbias (42A4) */
 	struct r300_state_atom unk42B4; /* (42B4) */
@@ -446,8 +463,8 @@ struct r300_hw_state {
 	struct r300_state_atom fpt;     /* texi - (4620) */
 	struct r300_state_atom unk46A4;	/* (46A4) */
 	struct r300_state_atom fpi[4];	/* fp instructions (46C0/47C0/48C0/49C0) */
-	struct r300_state_atom unk4BC0;	/* (4BC0) */
-	struct r300_state_atom unk4BC8;	/* (4BC8) */
+	struct r300_state_atom fogs;	/* fog state (4BC0) */
+	struct r300_state_atom fogc;	/* fog color (4BC8) */
 	struct r300_state_atom at;	/* alpha test (4BD4) */
 	struct r300_state_atom unk4BD8;	/* (4BD8) */
 	struct r300_state_atom fpp;     /* 0x4C00 and following */
diff --git a/src/mesa/drivers/dri/r300/r300_ioctl.c b/src/mesa/drivers/dri/r300/r300_ioctl.c
index 0115d622a9..159285962d 100644
--- a/src/mesa/drivers/dri/r300/r300_ioctl.c
+++ b/src/mesa/drivers/dri/r300/r300_ioctl.c
@@ -380,10 +380,16 @@ static void r300EmitClearState(GLcontext * ctx)
 	int i;
 	LOCAL_VARS;
 	
+	
 	R300_STATECHANGE(r300, vir[0]);
 	reg_start(R300_VAP_INPUT_ROUTE_0_0, 0);
 	e32(0x21030003);
 	
+	/* disable fog */
+	R300_STATECHANGE(r300, fogs);
+	reg_start(R300_RE_FOG_STATE, 0);
+	e32(0x0);
+	
 	R300_STATECHANGE(r300, vir[1]);
 	reg_start(R300_VAP_INPUT_ROUTE_1_0, 0);
 	e32(0xF688F688);
@@ -553,7 +559,7 @@ static void r300Clear(GLcontext * ctx, GLbitfield mask, GLboolean all,
 
 #ifdef CB_DPATH
 	/* Make sure it fits there. */
-	r300EnsureCmdBufSpace(r300, 419*3, __FUNCTION__);
+	r300EnsureCmdBufSpace(r300, 421*3, __FUNCTION__);
 	if(flags || bits)
 		r300EmitClearState(ctx);
 #endif
diff --git a/src/mesa/drivers/dri/r300/r300_reg.h b/src/mesa/drivers/dri/r300/r300_reg.h
index c78462af2e..4afe4f239c 100644
--- a/src/mesa/drivers/dri/r300/r300_reg.h
+++ b/src/mesa/drivers/dri/r300/r300_reg.h
@@ -517,6 +517,10 @@ I am fairly certain that they are correct unless stated otherwise in comments.
 #	define R300_PM_BACK_LINE              (1 << 7)
 #	define R300_PM_BACK_FILL              (1 << 8)
 
+/* Fog parameters */
+#define R300_RE_FOG_SCALE                     0x4294
+#define R300_RE_FOG_START                     0x4298
+
 /* Not sure why there are duplicate of factor and constant values. 
    My best guess so far is that there are seperate zbiases for test and write. 
    Ordering might be wrong.
@@ -1113,7 +1117,17 @@ I am fairly certain that they are correct unless stated otherwise in comments.
 #       define R300_FPI2_UNKNOWN_31              (1 << 31)
 /* END */
 
-/* gap */
+/* Fog state and color */
+#define R300_RE_FOG_STATE                   0x4BC0
+#       define R300_FOG_ENABLE                   (1 << 0)
+#	define R300_FOG_MODE_LINEAR              (0 << 1)
+#	define R300_FOG_MODE_EXP                 (1 << 1)
+#	define R300_FOG_MODE_EXP2                (2 << 1)
+#	define R300_FOG_MODE_MASK                (3 << 1)
+#define R300_FOG_COLOR_R                    0x4BC8
+#define R300_FOG_COLOR_G                    0x4BCC
+#define R300_FOG_COLOR_B                    0x4BD0
+
 #define R300_PP_ALPHA_TEST                  0x4BD4
 #       define R300_REF_ALPHA_MASK               0x000000ff
 #       define R300_ALPHA_TEST_FAIL              (0 << 8)
diff --git a/src/mesa/drivers/dri/r300/r300_render.c b/src/mesa/drivers/dri/r300/r300_render.c
index e6ed06a69d..783b2e292a 100644
--- a/src/mesa/drivers/dri/r300/r300_render.c
+++ b/src/mesa/drivers/dri/r300/r300_render.c
@@ -469,12 +469,12 @@ int r300Fallback(GLcontext *ctx)
 	FALLBACK_IF(ctx->Color.AlphaEnabled); // GL_ALPHA_TEST
 	FALLBACK_IF(ctx->Color.BlendEnabled); // GL_BLEND
 	FALLBACK_IF(ctx->Polygon.OffsetFill); // GL_POLYGON_OFFSET_FILL
+	FALLBACK_IF(ctx->Fog.Enabled);
 #endif
 	FALLBACK_IF(ctx->Polygon.OffsetPoint); // GL_POLYGON_OFFSET_POINT
 	FALLBACK_IF(ctx->Polygon.OffsetLine); // GL_POLYGON_OFFSET_LINE
 	//FALLBACK_IF(ctx->Stencil.Enabled); // GL_STENCIL_TEST
 	
-	//FALLBACK_IF(ctx->Fog.Enabled); // GL_FOG disable as swtcl doesnt seem to support this
 	//FALLBACK_IF(ctx->Polygon.SmoothFlag); // GL_POLYGON_SMOOTH disabling to get blender going
 	FALLBACK_IF(ctx->Polygon.StippleFlag); // GL_POLYGON_STIPPLE
 	FALLBACK_IF(ctx->Multisample.Enabled); // GL_MULTISAMPLE_ARB
diff --git a/src/mesa/drivers/dri/r300/r300_state.c b/src/mesa/drivers/dri/r300/r300_state.c
index d4dafe62a7..466b1cbe4f 100644
--- a/src/mesa/drivers/dri/r300/r300_state.c
+++ b/src/mesa/drivers/dri/r300/r300_state.c
@@ -417,6 +417,25 @@ static void r300Enable(GLcontext* ctx, GLenum cap, GLboolean state)
 	case GL_TEXTURE_3D:
 		break;
 
+	case GL_FOG:
+		R300_STATECHANGE(r300, fogs);
+		if (state) {
+			r300->hw.fogs.cmd[R300_FOGS_STATE] |=
+			    R300_FOG_ENABLE;
+			
+			r300Enable(ctx, GL_FOG, ctx->Fog.Enabled);
+			ctx->Driver.Fogfv( ctx, GL_FOG_MODE, NULL );
+			ctx->Driver.Fogfv( ctx, GL_FOG_DENSITY, &ctx->Fog.Density );
+			ctx->Driver.Fogfv( ctx, GL_FOG_START, &ctx->Fog.Start );
+			ctx->Driver.Fogfv( ctx, GL_FOG_END, &ctx->Fog.End );
+			ctx->Driver.Fogfv( ctx, GL_FOG_COLOR, ctx->Fog.Color );
+		} else {
+			r300->hw.fogs.cmd[R300_FOGS_STATE] &=
+			    ~R300_FOG_ENABLE;
+		}
+		
+		break;
+
 	case GL_ALPHA_TEST:
 		R300_STATECHANGE(r300, at);
 		if (state) {
@@ -640,6 +659,101 @@ static void r300ColorMask(GLcontext* ctx,
 }
 
 /* =============================================================
+ * 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:
+		if (!ctx->Fog.Enabled)
+			return;
+		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_FOG_MODE_MASK) | R300_FOG_MODE_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_FOG_MODE_MASK) | R300_FOG_MODE_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_FOG_MODE_MASK) | R300_FOG_MODE_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;
+	}
+}
+
+/* =============================================================
  * Point state
  */
 static void r300PointSize(GLcontext * ctx, GLfloat size)
@@ -1870,7 +1984,8 @@ void r300ResetHwState(r300ContextPtr r300)
 		r300->hw.gb_misc.cmd[R300_GB_MISC_TILE_CONFIG] = R300_GB_TILE_ENABLE
 							| R300_GB_TILE_PIPE_COUNT_RV300
 							| R300_GB_TILE_SIZE_16;
-	r300->hw.gb_misc.cmd[R300_GB_MISC_SELECT] = 0x00000000;
+	/* set to 0 when fog is disabled? */
+	r300->hw.gb_misc.cmd[R300_GB_MISC_SELECT] = R300_GB_FOG_SELECT_1_1_W;
 	r300->hw.gb_misc.cmd[R300_GB_MISC_AA_CONFIG] = 0x00000000; /* No antialiasing */
 
 	//r300->hw.txe.cmd[R300_TXE_ENABLE] = 0;
@@ -1907,9 +2022,6 @@ void r300ResetHwState(r300ContextPtr r300)
 	r300PolygonMode(ctx, GL_BACK, ctx->Polygon.BackMode);
 	r300->hw.unk4288.cmd[2] = 0x00000001;
 	r300->hw.unk4288.cmd[3] = 0x00000000;
-	r300->hw.unk4288.cmd[4] = 0x00000000;
-	r300->hw.unk4288.cmd[5] = 0x00000000;
-
 	r300->hw.unk42A0.cmd[1] = 0x00000000;
 
 	r300PolygonOffset(ctx, ctx->Polygon.OffsetFactor, ctx->Polygon.OffsetUnits);
@@ -1949,13 +2061,13 @@ void r300ResetHwState(r300ContextPtr r300)
 		r300->hw.fpi[3].cmd[i] = FP_SELA(0,W,NO,FP_TMP(0),0,0);
 	}
 #endif
-
-	r300->hw.unk4BC0.cmd[1] = 0;
-
-	r300->hw.unk4BC8.cmd[1] = 0;
-	r300->hw.unk4BC8.cmd[2] = 0;
-	r300->hw.unk4BC8.cmd[3] = 0;
-
+	r300Enable(ctx, GL_FOG, ctx->Fog.Enabled);
+	ctx->Driver.Fogfv( ctx, GL_FOG_MODE, NULL );
+	ctx->Driver.Fogfv( ctx, GL_FOG_DENSITY, &ctx->Fog.Density );
+	ctx->Driver.Fogfv( ctx, GL_FOG_START, &ctx->Fog.Start );
+	ctx->Driver.Fogfv( ctx, GL_FOG_END, &ctx->Fog.End );
+	ctx->Driver.Fogfv( ctx, GL_FOG_COLOR, ctx->Fog.Color );
+	ctx->Driver.Fogfv( ctx, GL_FOG_COORDINATE_SOURCE_EXT, NULL );
 
 	r300->hw.at.cmd[R300_AT_UNKNOWN] = 0;
 	r300->hw.unk4BD8.cmd[1] = 0;
@@ -2128,6 +2240,7 @@ void r300InitStateFuncs(struct dd_function_table* functions)
 	functions->DepthFunc = r300DepthFunc;
 	functions->DepthMask = r300DepthMask;
 	functions->CullFace = r300CullFace;
+	functions->Fogfv = r300Fogfv;
 	functions->FrontFace = r300FrontFace;
 	functions->ShadeModel = r300ShadeModel;