summaryrefslogtreecommitdiff
path: root/src/mesa
diff options
context:
space:
mode:
authorBrian Paul <brianp@vmware.com>2009-02-02 16:33:08 -0700
committerBrian Paul <brianp@vmware.com>2009-02-02 16:51:45 -0700
commitdea0d4d56326f148a42c766bdbaf1b5bb247cc59 (patch)
tree001cb5e05a1a279cf00e4fd993d1d8cb8222df91 /src/mesa
parent1cb7cd1292dc8592d4912194d91355eb61361be5 (diff)
mesa: fix GLSL issue preventing use of all 16 generic vertex attributes
Only 15 actually worked before since we always reserved generic[0] as an alias for vertex position. The case of vertex attribute 0 is tricky. The spec says that there is no aliasing between generic vertex attributes 0..MAX_VERTEX_ATTRIBS-1 and the conventional attributes. But it also says that calls to glVertexAttrib(0, v) are equivalent to glVertex(v). The distinction seems to be in glVertex-mode versus vertex array mode. So update the VBO code so that if the shader uses generic[0] but not gl_Vertex, route the attribute data set with glVertex() to go to shader input generic[0]. No change needed for the glDrawArrays/Elements() path. This is a potentially risky change so regressions are possible. All the usual tests seem OK though.
Diffstat (limited to 'src/mesa')
-rw-r--r--src/mesa/shader/slang/slang_link.c13
-rw-r--r--src/mesa/vbo/vbo_exec_api.c5
-rw-r--r--src/mesa/vbo/vbo_exec_draw.c13
-rw-r--r--src/mesa/vbo/vbo_save_draw.c18
4 files changed, 45 insertions, 4 deletions
diff --git a/src/mesa/shader/slang/slang_link.c b/src/mesa/shader/slang/slang_link.c
index c6d5cc0566..77bcda0871 100644
--- a/src/mesa/shader/slang/slang_link.c
+++ b/src/mesa/shader/slang/slang_link.c
@@ -318,7 +318,7 @@ _slang_resolve_attributes(struct gl_shader_program *shProg,
{
GLint attribMap[MAX_VERTEX_ATTRIBS];
GLuint i, j;
- GLbitfield usedAttributes;
+ GLbitfield usedAttributes; /* generics only, not legacy attributes */
assert(origProg != linkedProg);
assert(origProg->Target == GL_VERTEX_PROGRAM_ARB);
@@ -342,6 +342,15 @@ _slang_resolve_attributes(struct gl_shader_program *shProg,
usedAttributes |= (1 << attr);
}
+ /* If gl_Vertex is used, that actually counts against the limit
+ * on generic vertex attributes. This avoids the ambiguity of
+ * whether glVertexAttrib4fv(0, v) sets legacy attribute 0 (vert pos)
+ * or generic attribute[0]. If gl_Vertex is used, we want the former.
+ */
+ if (origProg->InputsRead & VERT_BIT_POS) {
+ usedAttributes |= 0x1;
+ }
+
/* initialize the generic attribute map entries to -1 */
for (i = 0; i < MAX_VERTEX_ATTRIBS; i++) {
attribMap[i] = -1;
@@ -384,7 +393,7 @@ _slang_resolve_attributes(struct gl_shader_program *shProg,
* Start at 1 since generic attribute 0 always aliases
* glVertex/position.
*/
- for (attr = 1; attr < MAX_VERTEX_ATTRIBS; attr++) {
+ for (attr = 0; attr < MAX_VERTEX_ATTRIBS; attr++) {
if (((1 << attr) & usedAttributes) == 0)
break;
}
diff --git a/src/mesa/vbo/vbo_exec_api.c b/src/mesa/vbo/vbo_exec_api.c
index d48f5230cb..f6daa253fd 100644
--- a/src/mesa/vbo/vbo_exec_api.c
+++ b/src/mesa/vbo/vbo_exec_api.c
@@ -148,11 +148,14 @@ static void vbo_exec_copy_to_current( struct vbo_exec_context *exec )
/* Note: the exec->vtx.current[i] pointers point into the
* ctx->Current.Attrib and ctx->Light.Material.Attrib arrays.
*/
+ if (exec->vtx.attrptr[i]) {
+
COPY_CLEAN_4V(current,
exec->vtx.attrsz[i],
exec->vtx.attrptr[i]);
-
+ }
+
/* Given that we explicitly state size here, there is no need
* for the COPY_CLEAN above, could just copy 16 bytes and be
* done. The only problem is when Mesa accesses ctx->Current
diff --git a/src/mesa/vbo/vbo_exec_draw.c b/src/mesa/vbo/vbo_exec_draw.c
index 5b2e3550ca..7204aec1dc 100644
--- a/src/mesa/vbo/vbo_exec_draw.c
+++ b/src/mesa/vbo/vbo_exec_draw.c
@@ -175,7 +175,20 @@ static void vbo_exec_bind_arrays( GLcontext *ctx )
exec->vtx.inputs[attr + 16] = &vbo->generic_currval[attr];
}
map = vbo->map_vp_arb;
+
+ /* check if VERT_ATTRIB_POS is not read but VERT_BIT_GENERIC0 is read.
+ * In that case we effectively need to route the data from
+ * glVertexAttrib(0, val) calls to feed into the GENERIC0 input.
+ */
+ if ((ctx->VertexProgram._Current->Base.InputsRead & VERT_BIT_POS) == 0 &&
+ (ctx->VertexProgram._Current->Base.InputsRead & VERT_BIT_GENERIC0)) {
+ exec->vtx.inputs[16] = exec->vtx.inputs[0];
+ exec->vtx.attrsz[16] = exec->vtx.attrsz[0];
+ exec->vtx.attrsz[0] = 0;
+ }
break;
+ default:
+ assert(0);
}
/* Make all active attributes (including edgeflag) available as
diff --git a/src/mesa/vbo/vbo_save_draw.c b/src/mesa/vbo/vbo_save_draw.c
index 6fa3f1a7e4..7ee0a9a33f 100644
--- a/src/mesa/vbo/vbo_save_draw.c
+++ b/src/mesa/vbo/vbo_save_draw.c
@@ -110,6 +110,9 @@ static void vbo_bind_vertex_list( GLcontext *ctx,
GLuint data = node->buffer_offset;
const GLuint *map;
GLuint attr;
+ GLubyte node_attrsz[VBO_ATTRIB_MAX]; /* copy of node->attrsz[] */
+
+ memcpy(node_attrsz, node->attrsz, sizeof(node->attrsz));
/* Install the default (ie Current) attributes first, then overlay
* all active ones.
@@ -135,13 +138,26 @@ static void vbo_bind_vertex_list( GLcontext *ctx,
save->inputs[attr + 16] = &vbo->generic_currval[attr];
}
map = vbo->map_vp_arb;
+
+ /* check if VERT_ATTRIB_POS is not read but VERT_BIT_GENERIC0 is read.
+ * In that case we effectively need to route the data from
+ * glVertexAttrib(0, val) calls to feed into the GENERIC0 input.
+ */
+ if ((ctx->VertexProgram._Current->Base.InputsRead & VERT_BIT_POS) == 0 &&
+ (ctx->VertexProgram._Current->Base.InputsRead & VERT_BIT_GENERIC0)) {
+ save->inputs[16] = save->inputs[0];
+ node_attrsz[16] = node_attrsz[0];
+ node_attrsz[0] = 0;
+ }
break;
+ default:
+ assert(0);
}
for (attr = 0; attr < VERT_ATTRIB_MAX; attr++) {
GLuint src = map[attr];
- if (node->attrsz[src]) {
+ if (node_attrsz[src]) {
/* override the default array set above */
save->inputs[attr] = &arrays[attr];