From cafb0617eaacf09d9d19b75a5596b4dd2a1f85ba Mon Sep 17 00:00:00 2001
From: Aapo Tahkola <aet@rasterburn.org>
Date: Tue, 22 Aug 2006 21:54:50 +0000
Subject: [PATCH] extend some DrawRangeElements cases to support rendering more
 than 65535 verts in one blast. ut2k4 cases in other words ...

---
 src/mesa/drivers/dri/r300/r300_context.h    |  2 ++
 src/mesa/drivers/dri/r300/r300_render.c     |  7 ++--
 src/mesa/drivers/dri/r300/radeon_vtxfmt_a.c | 36 ++++++++++++++++++++-
 3 files changed, 39 insertions(+), 6 deletions(-)

diff --git a/src/mesa/drivers/dri/r300/r300_context.h b/src/mesa/drivers/dri/r300/r300_context.h
index 48677909519..1acb6a6c944 100644
--- a/src/mesa/drivers/dri/r300/r300_context.h
+++ b/src/mesa/drivers/dri/r300/r300_context.h
@@ -847,6 +847,8 @@ extern GLboolean r300CreateContext(const __GLcontextModes * glVisual,
 				   __DRIcontextPrivate * driContextPriv,
 				   void *sharedContextPrivate);
 
+extern int r300_get_num_verts(r300ContextPtr rmesa, int num_verts, int prim);
+
 void r300_translate_vertex_shader(struct r300_vertex_program *vp);
 extern void r300InitShaderFuncs(struct dd_function_table *functions);
 extern int r300VertexProgUpdateParams(GLcontext *ctx, struct r300_vertex_program *vp, float *dst);
diff --git a/src/mesa/drivers/dri/r300/r300_render.c b/src/mesa/drivers/dri/r300/r300_render.c
index 0f1e567a910..c49567d69e9 100644
--- a/src/mesa/drivers/dri/r300/r300_render.c
+++ b/src/mesa/drivers/dri/r300/r300_render.c
@@ -113,10 +113,7 @@ static int r300_get_primitive_type(r300ContextPtr rmesa, GLcontext *ctx, int pri
    return type;
 }
 
-static int r300_get_num_verts(r300ContextPtr rmesa,
-	GLcontext *ctx,
-	int num_verts,
-	int prim)
+int r300_get_num_verts(r300ContextPtr rmesa, int num_verts, int prim)
 {
 	int verts_off=0;
 	char *name="UNKNOWN";
@@ -286,7 +283,7 @@ static void r300_render_vb_primitive(r300ContextPtr rmesa,
    int type, num_verts;
 
    type=r300_get_primitive_type(rmesa, ctx, prim);
-   num_verts=r300_get_num_verts(rmesa, ctx, end-start, prim);
+   num_verts=r300_get_num_verts(rmesa, end-start, prim);
 
    if(type<0 || num_verts <= 0)return;
 
diff --git a/src/mesa/drivers/dri/r300/radeon_vtxfmt_a.c b/src/mesa/drivers/dri/r300/radeon_vtxfmt_a.c
index cbd837fa725..7f539b43776 100644
--- a/src/mesa/drivers/dri/r300/radeon_vtxfmt_a.c
+++ b/src/mesa/drivers/dri/r300/radeon_vtxfmt_a.c
@@ -344,6 +344,22 @@ static void radeonDrawElements( GLenum mode, GLsizei count, GLenum type, const G
 	_mesa_install_exec_vtxfmt( ctx, &TNL_CONTEXT(ctx)->exec_vtxfmt );
 }
 
+static int elt_bytes(GLenum type)
+{
+       switch (type) {
+       case GL_UNSIGNED_BYTE:
+               return 1;
+       case GL_UNSIGNED_SHORT:
+               return 2;
+       case GL_UNSIGNED_INT:
+               return 4;
+       default:
+               _mesa_problem(NULL, "bad elt type in %s", __FUNCTION__);
+               return 0;
+       }
+       return 0;
+}
+
 static void radeonDrawRangeElements(GLenum mode, GLuint min, GLuint max, GLsizei count, GLenum type, const GLvoid *c_indices)
 {
 	GET_CURRENT_CONTEXT(ctx);
@@ -356,6 +372,25 @@ static void radeonDrawRangeElements(GLenum mode, GLuint min, GLuint max, GLsizei
 	const GLvoid *indices = c_indices;
 	
 	if (count > 65535) {
+		/* TODO */
+		if (mode == GL_POINTS ||
+		    mode == GL_LINES ||
+		    mode == GL_QUADS ||
+		    mode == GL_TRIANGLES) {
+			
+			if (!_mesa_validate_DrawRangeElements( ctx, mode, min, max, count, type, indices ))
+				return;
+			
+			while (count) {
+				i = r300_get_num_verts(rmesa, MIN2(count, 65535), mode);
+				
+				radeonDrawRangeElements(mode, min, max, i, type, indices);
+				
+				indices += i * elt_bytes(type);
+				count -= i;
+			}
+			return ;
+		}
 		WARN_ONCE("Too many verts!\n");
 		goto fallback;
 	}
@@ -506,7 +541,6 @@ static void radeonDrawArrays( GLenum mode, GLint start, GLsizei count )
 	GET_CURRENT_CONTEXT(ctx);
 	r300ContextPtr rmesa = R300_CONTEXT(ctx);
 	struct tnl_prim prim;
-	int i;
 	
 	if (count > 65535) {
 		WARN_ONCE("Too many verts!\n");
-- 
2.30.2