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gallium: initial edgeflags code

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This commit is contained in:
Brian Paul 2008-04-24 16:01:18 -06:00
parent 9816531862
commit ef683014dd
1 changed files with 59 additions and 1 deletions
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60
src/mesa/state_tracker/st_draw.c
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@ -190,6 +190,57 @@ pipe_vertex_format(GLenum type, GLuint size, GLboolean normalized)
}
/*
* If edge flags are needed, setup an bitvector of flags and call
* pipe->set_edgeflags().
* XXX memleak: need to free the returned pointer at some point
*/
static void *
setup_edgeflags(GLcontext *ctx, GLenum primMode, GLint start, GLint count,
const struct gl_client_array *array)
{
struct pipe_context *pipe = ctx->st->pipe;
if ((primMode == GL_TRIANGLES ||
primMode == GL_QUADS ||
primMode == GL_POLYGON) &&
(ctx->Polygon.FrontMode != GL_FILL ||
ctx->Polygon.BackMode != GL_FILL)) {
/* need edge flags */
GLuint i;
unsigned *vec = (unsigned *) calloc(sizeof(unsigned), (count + 31) / 32);
struct st_buffer_object *stobj = st_buffer_object(array->BufferObj);
ubyte *map;
if (!vec)
return NULL;
map = pipe->winsys->buffer_map(pipe->winsys, stobj->buffer,
PIPE_BUFFER_USAGE_CPU_READ);
map = ADD_POINTERS(map, array->Ptr);
for (i = 0; i < count; i++) {
if (*((float *) map))
vec[i/32] |= 1 << (i % 32);
map += array->StrideB;
}
pipe->winsys->buffer_unmap(pipe->winsys, stobj->buffer);
pipe->set_edgeflags(pipe, vec);
return vec;
}
else {
/* edge flags not needed */
pipe->set_edgeflags(pipe, NULL);
return NULL;
}
}
/**
* This function gets plugged into the VBO module and is called when
* we have something to render.
@ -277,7 +328,6 @@ st_draw_vbo(GLcontext *ctx,
pipe->set_vertex_buffers(pipe, vp->num_inputs, vbuffer);
pipe->set_vertex_elements(pipe, vp->num_inputs, velements);
/* do actual drawing */
if (ib) {
/* indexed primitive */
@ -317,6 +367,10 @@ st_draw_vbo(GLcontext *ctx,
/* draw */
for (i = 0; i < nr_prims; i++) {
setup_edgeflags(ctx, prims[i].mode,
prims[i].start + indexOffset, prims[i].count,
arrays[VERT_ATTRIB_EDGEFLAG]);
pipe->draw_elements(pipe, indexBuf, indexSize,
prims[i].mode,
prims[i].start + indexOffset, prims[i].count);
@ -328,6 +382,10 @@ st_draw_vbo(GLcontext *ctx,
/* non-indexed */
GLuint i;
for (i = 0; i < nr_prims; i++) {
setup_edgeflags(ctx, prims[i].mode,
prims[i].start, prims[i].count,
arrays[VERT_ATTRIB_EDGEFLAG]);
pipe->draw_arrays(pipe, prims[i].mode, prims[i].start, prims[i].count);
}
}