summaryrefslogtreecommitdiff
path: root/src/mesa/state_tracker/st_draw.c
diff options
context:
space:
mode:
authorBrian <brian.paul@tungstengraphics.com>2007-08-18 16:05:49 +0100
committerBrian <brian.paul@tungstengraphics.com>2007-08-18 16:05:49 +0100
commit1f026d98dd77b6d26cc76946d92f69a9e6091b8e (patch)
tree24d7b0a41210cf848f3f77b1ea03bce6e94acbd0 /src/mesa/state_tracker/st_draw.c
parentb3f067e8593b9fda0474041f32479b20cd64e728 (diff)
Create a default vertex attribute buffer which mirrors ctx->Current.Attrrib[]
Used when the vertex shader references attributes which aren't present in VBOs.
Diffstat (limited to 'src/mesa/state_tracker/st_draw.c')
-rw-r--r--src/mesa/state_tracker/st_draw.c113
1 files changed, 86 insertions, 27 deletions
diff --git a/src/mesa/state_tracker/st_draw.c b/src/mesa/state_tracker/st_draw.c
index 425076d653..db24b24fa7 100644
--- a/src/mesa/state_tracker/st_draw.c
+++ b/src/mesa/state_tracker/st_draw.c
@@ -44,6 +44,7 @@
#include "st_cb_bufferobjects.h"
#include "pipe/p_context.h"
#include "pipe/p_defines.h"
+#include "pipe/p_winsys.h"
#include "vbo/vbo_context.h"
@@ -52,7 +53,7 @@
* bypassing the T&L module. This only works with VBO-based demos,
* such as progs/test/bufferobj.c
*/
-#define USE_NEW_DRAW 0
+#define USE_NEW_DRAW 01
/*
@@ -135,6 +136,38 @@ pipe_vertex_format(GLenum format, GLuint size)
/**
+ * The default attribute buffer is basically a copy of the
+ * ctx->Current.Attrib[] array. It's used when the vertex program
+ * references an attribute for which we don't have a VBO/array.
+ */
+static void
+create_default_attribs_buffer(struct st_context *st)
+{
+ struct pipe_context *pipe = st->pipe;
+ st->default_attrib_buffer = pipe->winsys->buffer_create( pipe->winsys, 32 );
+}
+
+
+static void
+destroy_default_attribs_buffer(struct st_context *st)
+{
+ struct pipe_context *pipe = st->pipe;
+ pipe->winsys->buffer_unreference(pipe->winsys, &st->default_attrib_buffer);
+}
+
+
+static void
+update_default_attribs_buffer(GLcontext *ctx)
+{
+ struct pipe_context *pipe = ctx->st->pipe;
+ struct pipe_buffer_handle *buf = ctx->st->default_attrib_buffer;
+ const unsigned size = sizeof(ctx->Current.Attrib);
+ const void *data = ctx->Current.Attrib;
+ pipe->winsys->buffer_data(pipe->winsys, buf, size, data);
+}
+
+
+/**
* This function gets plugged into the VBO module and is called when
* we have something to render.
* Basically, translate the information into the format expected by pipe.
@@ -150,41 +183,66 @@ draw_vbo(GLcontext *ctx,
{
struct pipe_context *pipe = ctx->st->pipe;
GLuint attr, i;
+ GLbitfield attrsNeeded;
+ const unsigned attr0_offset = (unsigned) arrays[0]->Ptr;
st_validate_state(ctx->st);
+ update_default_attribs_buffer(ctx);
+ /* this must be after state validation */
+ attrsNeeded = ctx->st->state.vs.inputs_read;
/* tell pipe about the vertex array element/attributes */
for (attr = 0; attr < 16; attr++) {
- struct gl_buffer_object *bufobj = arrays[attr]->BufferObj;
struct pipe_vertex_buffer vbuffer;
struct pipe_vertex_element velement;
- if (bufobj && bufobj->Name) {
- struct st_buffer_object *stobj = st_buffer_object(bufobj);
-
- assert(stobj->buffer);
-
- vbuffer.pitch = arrays[attr]->StrideB; /* in bytes */
- vbuffer.max_index = 0;
- vbuffer.buffer = stobj->buffer;
- vbuffer.buffer_offset = 0;
-
- /* Recall that for VBOs, the gl_client_array->Ptr field is
- * really an offset from the start of the VBO, not a pointer.
- */
- velement.src_offset = (unsigned) arrays[attr]->Ptr;
- velement.vertex_buffer_index = attr;
- velement.dst_offset = 0;
- velement.src_format = pipe_vertex_format(arrays[attr]->Type,
- arrays[attr]->Size);
+ vbuffer.buffer = NULL;
+ vbuffer.pitch = 0;
+ velement.src_offset = 0;
+ velement.vertex_buffer_index = 0;
+ velement.src_format = 0;
+
+ if (attrsNeeded & (1 << attr)) {
+ struct gl_buffer_object *bufobj = arrays[attr]->BufferObj;
+
+ if (bufobj && bufobj->Name) {
+ struct st_buffer_object *stobj = st_buffer_object(bufobj);
+ /* Recall that for VBOs, the gl_client_array->Ptr field is
+ * really an offset from the start of the VBO, not a pointer.
+ */
+ unsigned offset = (unsigned) arrays[attr]->Ptr;
+
+ assert(stobj->buffer);
+
+ vbuffer.buffer = stobj->buffer;
+ vbuffer.buffer_offset = attr0_offset; /* in bytes */
+ vbuffer.pitch = arrays[attr]->StrideB; /* in bytes */
+ vbuffer.max_index = 0; /* need this? */
+
+ velement.src_offset = offset - attr0_offset; /* bytes */
+ velement.vertex_buffer_index = attr;
+ velement.dst_offset = 0; /* need this? */
+ velement.src_format = pipe_vertex_format(arrays[attr]->Type,
+ arrays[attr]->Size);
+ assert(velement.src_format);
+ }
+ else {
+ /* use the default attribute buffer */
+ vbuffer.buffer = ctx->st->default_attrib_buffer;
+ vbuffer.buffer_offset = 0;
+ vbuffer.pitch = 0; /* must be zero! */
+ vbuffer.max_index = 1;
+
+ velement.src_offset = attr * 4 * sizeof(GLfloat);
+ velement.vertex_buffer_index = attr;
+ velement.dst_offset = 0;
+ velement.src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
+ }
}
- else {
- /* vertex attribute data is not an a real buffer! */
- /* XXX we'll want to handle that someday... */
- vbuffer.buffer = NULL;
- }
+ if (attr == 0)
+ assert(vbuffer.buffer);
pipe->set_vertex_buffer(pipe, attr, &vbuffer);
pipe->set_vertex_element(pipe, attr, &velement);
@@ -209,6 +267,8 @@ void st_init_draw( struct st_context *st )
#if USE_NEW_DRAW
struct vbo_context *vbo = (struct vbo_context *) ctx->swtnl_im;
+ create_default_attribs_buffer(st);
+
assert(vbo);
assert(vbo->draw_prims);
vbo->draw_prims = draw_vbo;
@@ -224,8 +284,7 @@ void st_init_draw( struct st_context *st )
void st_destroy_draw( struct st_context *st )
{
- /* Nothing to do.
- */
+ destroy_default_attribs_buffer(st);
}