r300: Implement hardware acceleration for ColorLogicOp

5 files changed, 49 insertions, 4 deletions

diff --git a/src/mesa/drivers/dri/r300/r300_cmdbuf.c b/src/mesa/drivers/dri/r300/r300_cmdbuf.c
index 4dc31614492..c069660eeaf 100644
--- a/src/mesa/drivers/dri/r300/r300_cmdbuf.c
+++ b/src/mesa/drivers/dri/r300/r300_cmdbuf.c
@@ -477,6 +477,8 @@ void r300InitCmdBuf(r300ContextPtr r300)
 		ALLOC_STATE(blend_color, always, 2, 0);
 		r300->hw.blend_color.cmd[0] = cmdpacket0(R300_RB3D_BLEND_COLOR, 1);
 	}
+	ALLOC_STATE(rop, always, 2, 0);
+	r300->hw.rop.cmd[0] = cmdpacket0(R300_RB3D_ROPCNTL, 1);
 	ALLOC_STATE(cb, always, R300_CB_CMDSIZE, 0);
 	r300->hw.cb.cmd[R300_CB_CMD_0] = cmdpacket0(R300_RB3D_COLOROFFSET0, 1);
 	r300->hw.cb.cmd[R300_CB_CMD_1] = cmdpacket0(R300_RB3D_COLORPITCH0, 1);
diff --git a/src/mesa/drivers/dri/r300/r300_context.h b/src/mesa/drivers/dri/r300/r300_context.h
index 98af6d8f10a..d2017f8afeb 100644
--- a/src/mesa/drivers/dri/r300/r300_context.h
+++ b/src/mesa/drivers/dri/r300/r300_context.h
@@ -516,6 +516,7 @@ struct r300_hw_state {
 	struct r300_state_atom bld;	/* blending (4E04) */
 	struct r300_state_atom cmk;	/* colormask (4E0C) */
 	struct r300_state_atom blend_color;	/* constant blend color */
+	struct r300_state_atom rop;	/* ropcntl */
 	struct r300_state_atom cb;	/* colorbuffer (4E28) */
 	struct r300_state_atom rb3d_dither_ctl;	/* (4E50) */
 	struct r300_state_atom rb3d_aaresolve_ctl;	/* (4E88) */
diff --git a/src/mesa/drivers/dri/r300/r300_reg.h b/src/mesa/drivers/dri/r300/r300_reg.h
index ec2b58377c5..562cd6afdb2 100644
--- a/src/mesa/drivers/dri/r300/r300_reg.h
+++ b/src/mesa/drivers/dri/r300/r300_reg.h
@@ -2249,7 +2249,9 @@ USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 /* 3D ROP Control. Stalls the 2d/3d datapath until it is idle. */
 #define R300_RB3D_ROPCNTL                             0x4e18
-/* TODO: fill in content here */
+#	define R300_RB3D_ROPCNTL_ROP_ENABLE            0x00000004
+#	define R300_RB3D_ROPCNTL_ROP_MASK              (15 << 8)
+#	define R300_RB3D_ROPCNTL_ROP_SHIFT             8
 
 /* Color Compare Flip. Stalls the 2d/3d datapath until it is idle. */
 #define R300_RB3D_CLRCMP_FLIPE                        0x4e1c
diff --git a/src/mesa/drivers/dri/r300/r300_render.c b/src/mesa/drivers/dri/r300/r300_render.c
index 58bc0884431..0a199e6faad 100644
--- a/src/mesa/drivers/dri/r300/r300_render.c
+++ b/src/mesa/drivers/dri/r300/r300_render.c
@@ -377,8 +377,6 @@ static int r300Fallback(GLcontext * ctx)
 			|| ctx->Stencil.WriteMask[0] !=
 			ctx->Stencil.WriteMask[1]));
 
-	FALLBACK_IF(ctx->Color.ColorLogicOpEnabled);
-
 	if (ctx->Extensions.NV_point_sprite || ctx->Extensions.ARB_point_sprite)
 		FALLBACK_IF(ctx->Point.PointSprite);
 
diff --git a/src/mesa/drivers/dri/r300/r300_state.c b/src/mesa/drivers/dri/r300/r300_state.c
index 6931de4421d..ec17974d78c 100644
--- a/src/mesa/drivers/dri/r300/r300_state.c
+++ b/src/mesa/drivers/dri/r300/r300_state.c
@@ -321,6 +321,44 @@ static void r300BlendFuncSeparate(GLcontext * ctx,
 	r300SetBlendState(ctx);
 }
 
+/**
+ * Translate LogicOp enums into hardware representation.
+ * Both use a very logical bit-wise layout, but unfortunately the order
+ * of bits is reversed.
+ */
+static GLuint translate_logicop(GLenum logicop)
+{
+	GLuint bits = logicop - GL_CLEAR;
+	bits = ((bits & 1) << 3) | ((bits & 2) << 1) | ((bits & 4) >> 1) | ((bits & 8) >> 3);
+	return bits << R300_RB3D_ROPCNTL_ROP_SHIFT;
+}
+
+/**
+ * Used internally to update the r300->hw hardware state to match the
+ * current OpenGL state.
+ */
+static void r300SetLogicOpState(GLcontext *ctx)
+{
+	r300ContextPtr r300 = R300_CONTEXT(ctx);
+	R300_STATECHANGE(r300, rop);
+	if (RGBA_LOGICOP_ENABLED(ctx)) {
+		r300->hw.rop.cmd[1] = R300_RB3D_ROPCNTL_ROP_ENABLE |
+			translate_logicop(ctx->Color.LogicOp);
+	} else {
+		r300->hw.rop.cmd[1] = 0;
+	}
+}
+
+/**
+ * Called by Mesa when an application program changes the LogicOp state
+ * via glLogicOp.
+ */
+static void r300LogicOpcode(GLcontext *ctx, GLenum logicop)
+{
+	if (RGBA_LOGICOP_ENABLED(ctx))
+		r300SetLogicOpState(ctx);
+}
+
 static void r300ClipPlane( GLcontext *ctx, GLenum plane, const GLfloat *eq )
 {
 	r300ContextPtr rmesa = R300_CONTEXT(ctx);
@@ -2117,8 +2155,10 @@ static void r300Enable(GLcontext * ctx, GLenum cap, GLboolean state)
 	case GL_ALPHA_TEST:
 		r300SetAlphaState(ctx);
 		break;
-	case GL_BLEND:
 	case GL_COLOR_LOGIC_OP:
+		r300SetLogicOpState(ctx);
+		/* fall-through, because logic op overrides blending */
+	case GL_BLEND:
 		r300SetBlendState(ctx);
 		break;
 	case GL_CLIP_PLANE0:
@@ -2188,6 +2228,7 @@ static void r300ResetHwState(r300ContextPtr r300)
 	r300UpdateTextureState(ctx);
 
 	r300SetBlendState(ctx);
+	r300SetLogicOpState(ctx);
 
 	r300AlphaFunc(ctx, ctx->Color.AlphaFunc, ctx->Color.AlphaRef);
 	r300Enable(ctx, GL_ALPHA_TEST, ctx->Color.AlphaEnabled);
@@ -2755,6 +2796,7 @@ void r300InitStateFuncs(struct dd_function_table *functions)
 	functions->Fogfv = r300Fogfv;
 	functions->FrontFace = r300FrontFace;
 	functions->ShadeModel = r300ShadeModel;
+	functions->LogicOpcode = r300LogicOpcode;
 
 	/* ARB_point_parameters */
 	functions->PointParameterfv = r300PointParameter;