From 74bf43051c5a0abbe83f431ca8e1d8d4d2b068c4 Mon Sep 17 00:00:00 2001
From: Vladimir Dergachev <volodya@freedesktop.org>
Date: Thu, 30 Dec 2004 06:06:54 +0000
Subject: [PATCH] Port viewport setting code from R200. Take it outside
 R300ResetHwState.

---
 src/mesa/drivers/dri/r300/r300_context.h | 11 ++++
 src/mesa/drivers/dri/r300/r300_state.c   | 81 ++++++++++++++++++------
 src/mesa/drivers/dri/r300/r300_state.h   | 13 ++++
 3 files changed, 85 insertions(+), 20 deletions(-)

diff --git a/src/mesa/drivers/dri/r300/r300_context.h b/src/mesa/drivers/dri/r300/r300_context.h
index be276592593..5863ee52f2f 100644
--- a/src/mesa/drivers/dri/r300/r300_context.h
+++ b/src/mesa/drivers/dri/r300/r300_context.h
@@ -308,7 +308,13 @@ struct r300_cmdbuf {
 /**
  * State cache
  */
+ 
+struct r300_depthbuffer_state {
+	GLfloat scale;
+};
+
 struct r300_state {
+	struct r300_depthbuffer_state depth;
 };
 
 
@@ -321,6 +327,11 @@ struct r300_context {
 	struct r300_hw_state hw;
 	struct r300_cmdbuf cmdbuf;
 	struct r300_state state;
+	
+	/* Vertex buffers */
+	int elt_count;  /* size of the buffer for vertices */
+	int attrib_count; /* size of the buffer for vertex attributes.. Somehow it can be different ? */
+	
 };
 
 #define R300_CONTEXT(ctx)		((r300ContextPtr)(ctx->DriverCtx))
diff --git a/src/mesa/drivers/dri/r300/r300_state.c b/src/mesa/drivers/dri/r300/r300_state.c
index 86b457bf82c..d080ae5bf71 100644
--- a/src/mesa/drivers/dri/r300/r300_state.c
+++ b/src/mesa/drivers/dri/r300/r300_state.c
@@ -225,6 +225,58 @@ static void r300ColorMask(GLcontext* ctx,
 	}
 }
 
+/* =============================================================
+ * Window position and viewport transformation
+ */
+
+/*
+ * To correctly position primitives:
+ */
+#define SUBPIXEL_X 0.125
+#define SUBPIXEL_Y 0.125
+
+void r300UpdateWindow(GLcontext * ctx)
+{
+	r300ContextPtr rmesa = R300_CONTEXT(ctx);
+	__DRIdrawablePrivate *dPriv = rmesa->radeon.dri.drawable;
+	GLfloat xoffset = dPriv ? (GLfloat) dPriv->x : 0;
+	GLfloat yoffset = dPriv ? (GLfloat) dPriv->y + dPriv->h : 0;
+	const GLfloat *v = ctx->Viewport._WindowMap.m;
+
+	GLfloat sx = v[MAT_SX];
+	GLfloat tx = v[MAT_TX] + xoffset + SUBPIXEL_X;
+	GLfloat sy = -v[MAT_SY];
+	GLfloat ty = (-v[MAT_TY]) + yoffset + SUBPIXEL_Y;
+	GLfloat sz = v[MAT_SZ] * rmesa->state.depth.scale;
+	GLfloat tz = v[MAT_TZ] * rmesa->state.depth.scale;
+
+	R300_FIREVERTICES(rmesa);
+	R300_STATECHANGE(rmesa, vpt);
+
+	rmesa->hw.vpt.cmd[R300_VPT_XSCALE]  = r300PackFloat32(sx);
+	rmesa->hw.vpt.cmd[R300_VPT_XOFFSET] = r300PackFloat32(tx);
+	rmesa->hw.vpt.cmd[R300_VPT_YSCALE]  = r300PackFloat32(sy);
+	rmesa->hw.vpt.cmd[R300_VPT_YOFFSET] = r300PackFloat32(ty);
+	rmesa->hw.vpt.cmd[R300_VPT_ZSCALE]  = r300PackFloat32(sz);
+	rmesa->hw.vpt.cmd[R300_VPT_ZOFFSET] = r300PackFloat32(tz);
+}
+
+static void r300Viewport(GLcontext * ctx, GLint x, GLint y,
+			 GLsizei width, GLsizei height)
+{
+	/* Don't pipeline viewport changes, conflict with window offset
+	 * setting below.  Could apply deltas to rescue pipelined viewport
+	 * values, or keep the originals hanging around.
+	 */
+	R200_FIREVERTICES(R200_CONTEXT(ctx));
+	r300UpdateWindow(ctx);
+}
+
+static void r300DepthRange(GLcontext * ctx, GLclampd nearval, GLclampd farval)
+{
+	r300UpdateWindow(ctx);
+}
+
 
 /**
  * Called by Mesa after an internal state update.
@@ -255,26 +307,8 @@ void r300ResetHwState(r300ContextPtr r300)
 	if (RADEON_DEBUG & DEBUG_STATE)
 		fprintf(stderr, "%s\n", __FUNCTION__);
 
-	{
-		__DRIdrawablePrivate *dPriv = r300->radeon.dri.drawable;
-		GLfloat xoffset = dPriv ? (GLfloat) dPriv->x : 0;
-		GLfloat yoffset = dPriv ? (GLfloat) dPriv->y + dPriv->h : 0;
-		const GLfloat *v = ctx->Viewport._WindowMap.m;
-
-		r300->hw.vpt.cmd[R300_VPT_XSCALE] =
-			r300PackFloat32(v[MAT_SX]);
-		r300->hw.vpt.cmd[R300_VPT_XOFFSET] =
-			r300PackFloat32(v[MAT_TX] + xoffset);
-		r300->hw.vpt.cmd[R300_VPT_YSCALE] =
-			r300PackFloat32(-v[MAT_SY]);
-		r300->hw.vpt.cmd[R300_VPT_YOFFSET] =
-			r300PackFloat32(-v[MAT_TY] + yoffset);
-		r300->hw.vpt.cmd[R300_VPT_ZSCALE] =
-			r300PackFloat32(v[MAT_SZ]);
-		r300->hw.vpt.cmd[R300_VPT_ZOFFSET] =
-			r300PackFloat32(v[MAT_TZ]);
-	}
-
+	r300UpdateWindow(ctx);
+	
 	r300ColorMask(ctx,
 		ctx->Color.ColorMask[RCOMP],
 		ctx->Color.ColorMask[GCOMP],
@@ -504,11 +538,14 @@ void r300ResetHwState(r300ContextPtr r300)
 void r300InitState(r300ContextPtr r300)
 {
 	radeonInitState(&r300->radeon);
+	
+	r300->state.depth.scale = 1.0 / (GLfloat) 0xffff;
 
 	r300ResetHwState(r300);
 }
 
 
+
 /**
  * Initialize driver's state callback functions
  */
@@ -523,5 +560,9 @@ void r300InitStateFuncs(struct dd_function_table* functions)
 	functions->DepthMask = r300DepthMask;
 	functions->CullFace = r300CullFace;
 	functions->FrontFace = r300FrontFace;
+
+	/* Viewport related */
+	functions->Viewport = r300Viewport;
+	functions->DepthRange = r300DepthRange;
 }
 
diff --git a/src/mesa/drivers/dri/r300/r300_state.h b/src/mesa/drivers/dri/r300/r300_state.h
index 9c945c4cdd6..a04835c79d1 100644
--- a/src/mesa/drivers/dri/r300/r300_state.h
+++ b/src/mesa/drivers/dri/r300/r300_state.h
@@ -43,6 +43,19 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 		r300->hw.is_dirty = GL_TRUE;		\
 	} while(0)
 
+/* Fire the buffered vertices no matter what.
+   TODO: This has not been implemented yet
+ */
+#define R300_FIREVERTICES( r300 )			\
+do {							\
+   /* \
+   if ( (r300)->store.cmd_used || (r300)->dma.flush ) {	\
+      radeonFlush( (r300)->radeon.glCtx );		\
+   }							\
+   */ \
+} while (0)
+
+	
 extern void r300ResetHwState(r300ContextPtr r300);
 
 extern void r300InitState(r300ContextPtr r300);
-- 
2.30.2