4 files changed, 132 insertions, 5 deletions
diff --git a/rtl/gfx/gfx_defs.sv b/rtl/gfx/gfx_defs.sv
index 1fe0df2..6e96b4e 100644
--- a/rtl/gfx/gfx_defs.sv
+++ b/rtl/gfx/gfx_defs.sv
@@ -11,10 +11,18 @@
 `define FP_MUL_STAGES 5  // ~144 LUTs ~1 bloque DSP
 `define FP_INV_STAGES 3  // ~178 LUTs ~1 bloque DSP
 
-typedef logic[`FLOAT_BITS - 1:0] fp;
-typedef fp                       vec2[2];
-typedef fp                       vec4[`FLOATS_PER_VEC];
-typedef vec4                     mat4[`VECS_PER_MAT];
+typedef logic[`FLOAT_BITS - 1:0]  fp;
+typedef fp                        vec2[2];
+typedef fp                        vec4[`FLOATS_PER_VEC];
+typedef fp[`FLOATS_PER_VEC - 1:0] vec4_packed;
+typedef vec4                      mat4[`VECS_PER_MAT];
+
+`define FP_UNIT 16'h3c00
+
+typedef struct packed
+{
+	fp x, y, z, w;
+} attr4;
 
 typedef logic[1:0] index4;
 
diff --git a/rtl/gfx/gfx_perspective.sv b/rtl/gfx/gfx_perspective.sv
new file mode 100644
index 0000000..3cc38b2
--- /dev/null
+++ b/rtl/gfx/gfx_perspective.sv
@@ -0,0 +1,69 @@
+`include "gfx/gfx_defs.sv"
+
+module gfx_perspective
+(
+	input  logic clk,
+
+	input  attr4 clip_attr,
+	input  logic stall,
+	             in_start,
+	             out_start,
+
+	output attr4 ndc_attr,
+	output fp    w_inv
+);
+
+	fp selected_w_inv, next_w_inv, vertex_w_inv, w_inv_pipes[`FP_MUL_STAGES];
+	vec4 in_pipes[`FP_INV_STAGES], div_q;
+
+	assign w_inv = w_inv_pipes[`FP_MUL_STAGES - 1];
+	assign selected_w_inv = in_start ? next_w_inv : vertex_w_inv;
+
+	fp_inv inv
+	(
+		.a(clip_attr.w),
+		.q(next_w_inv),
+		.*
+	);
+
+	genvar i;
+	generate
+		for (i = 0; i < `FLOATS_PER_VEC; ++i) begin: divs
+			fp_mul div
+			(
+				.a(in_pipes[`FP_INV_STAGES - 1][i]),
+				.b(selected_w_inv),
+				.q(div_q[i]),
+				.*
+			);
+		end
+
+		for (i = 1; i < `FP_INV_STAGES; ++i) begin: in
+			always_ff @(posedge clk)
+				if (!stall)
+					in_pipes[i] <= in_pipes[i - 1];
+		end
+
+		for (i = 1; i < `FP_MUL_STAGES; ++i) begin: out
+			always_ff @(posedge clk)
+				if (!stall)
+					w_inv_pipes[i] <= w_inv_pipes[i - 1];
+		end
+	endgenerate
+
+	always_comb begin
+		ndc_attr = div_q;
+		if (out_start)
+			ndc_attr.w = `FP_UNIT;
+	end
+
+	always_ff @(posedge clk)
+		if (!stall) begin
+			if (in_start)
+				vertex_w_inv <= next_w_inv;
+
+			in_pipes[0] <= clip_attr;
+			w_inv_pipes[0] <= selected_w_inv;
+		end
+
+endmodule
diff --git a/rtl/gfx/gfx_perspective_flow.sv b/rtl/gfx/gfx_perspective_flow.sv
new file mode 100644
index 0000000..ecacc65
--- /dev/null
+++ b/rtl/gfx/gfx_perspective_flow.sv
@@ -0,0 +1,50 @@
+`include "gfx/gfx_defs.sv"
+
+module gfx_perspective_flow
+(
+	input  logic clk,
+	             rst_n,
+
+	input  logic vertex_start,
+	output logic stall,
+	             in_start,
+	             out_start,
+
+	input  logic in_valid,
+	             out_ready,
+
+	output logic in_ready,
+	             out_valid
+	             stall
+);
+
+	localparam STAGES = `FP_INV_STAGES + `FP_MUL_STAGES;
+
+	logic[STAGES - 1:0] start_pipes;
+
+	assign in_start = start_pipes[`FP_INV_STAGES - 1];
+	assign out_start = start_pipes[STAGES - 1];
+
+	pipeline_flow #(.STAGES(STAGES)) flow
+	(
+		.*
+	);
+
+	always_ff @(posedge clk or negedge rst_n)
+		if (!rst_n)
+			start_pipes[0] <= 0;
+		else if (!stall)
+			start_pipes[0] <= in_valid && vertex_start;
+
+	genvar i;
+	generate
+		for (i = 1; i < STAGES; ++i) begin: pipeline
+			always_ff @(posedge clk or negedge rst_n)
+				if (!rst_n)
+					start_pipes[i] <= 0;
+				else if (!stall)
+					start_pipes[i] <= start_pipes[i - 1];
+		end
+	endgenerate
+
+endmodule
diff --git a/rtl/gfx/pipeline_flow.sv b/rtl/gfx/pipeline_flow.sv
index 15986d0..64b5714 100644
--- a/rtl/gfx/pipeline_flow.sv
+++ b/rtl/gfx/pipeline_flow.sv
@@ -12,7 +12,7 @@ module pipeline_flow
 	             stall
 );
 
-	logic valid[STAGES];
+	logic[STAGES - 1:0] valid;
 
 	skid_flow skid
 	(