static void
brw_draw_rectlist(struct brw_context *brw, struct rect *rect, int num_instances)
{
struct gl_context *ctx = &brw->ctx;
struct brw_fast_clear_state *clear = brw->fast_clear_state;
int start = 0, count = 3;
struct _mesa_prim prim;
float verts[6];
verts[0] = rect->x1;
verts[1] = rect->y1;
verts[2] = rect->x0;
verts[3] = rect->y1;
verts[4] = rect->x0;
verts[5] = rect->y0;
/* upload new vertex data */
_mesa_buffer_data(ctx, clear->buf_obj, GL_NONE, sizeof(verts), verts,
GL_DYNAMIC_DRAW, __func__);
if (ctx->NewState)
_mesa_update_state(ctx);
vbo_bind_arrays(ctx);
memset(&prim, 0, sizeof prim);
prim.begin = 1;
prim.end = 1;
prim.mode = BRW_PRIM_OFFSET + _3DPRIM_RECTLIST;
prim.num_instances = num_instances;
prim.start = start;
prim.count = count;
/* Make sure our internal prim value doesn't clash with a valid GL value. */
assert(!_mesa_is_valid_prim_mode(ctx, prim.mode));
brw_draw_prims(ctx, &prim, 1, NULL,
GL_TRUE, start, start + count - 1,
NULL, 0, NULL);
}
static void
vbo_draw_transform_feedback(struct gl_context *ctx, GLenum mode,
struct gl_transform_feedback_object *obj,
GLuint stream, GLuint numInstances)
{
struct vbo_context *vbo = vbo_context(ctx);
struct vbo_exec_context *exec = &vbo->exec;
struct _mesa_prim prim[2];
if (!_mesa_validate_DrawTransformFeedback(ctx, mode, obj, stream,
numInstances)) {
return;
}
vbo_bind_arrays(ctx);
/* init most fields to zero */
memset(prim, 0, sizeof(prim));
prim[0].begin = 1;
prim[0].end = 1;
prim[0].mode = mode;
prim[0].num_instances = numInstances;
prim[0].base_instance = 0;
/* Maybe we should do some primitive splitting for primitive restart
* (like in DrawArrays), but we have no way to know how many vertices
* will be rendered. */
check_buffers_are_unmapped(exec->array.inputs);
vbo->draw_prims(ctx, prim, 1, NULL,
GL_TRUE, 0, 0, obj);
if (MESA_DEBUG_FLAGS & DEBUG_ALWAYS_FLUSH) {
_mesa_flush(ctx);
}
}
/**
* Inner support for both _mesa_DrawElements and _mesa_DrawRangeElements.
* Do the rendering for a glDrawElements or glDrawRangeElements call after
* we've validated buffer bounds, etc.
*/
static void
vbo_validated_drawrangeelements(struct gl_context *ctx, GLenum mode,
GLboolean index_bounds_valid,
GLuint start, GLuint end,
GLsizei count, GLenum type,
const GLvoid *indices,
GLint basevertex, GLuint numInstances,
GLuint baseInstance)
{
struct vbo_context *vbo = vbo_context(ctx);
struct vbo_exec_context *exec = &vbo->exec;
struct _mesa_index_buffer ib;
struct _mesa_prim prim[1];
vbo_bind_arrays(ctx);
ib.count = count;
ib.type = type;
ib.obj = ctx->Array.ArrayObj->ElementArrayBufferObj;
ib.ptr = indices;
prim[0].begin = 1;
prim[0].end = 1;
prim[0].weak = 0;
prim[0].pad = 0;
prim[0].mode = mode;
prim[0].start = 0;
prim[0].count = count;
prim[0].indexed = 1;
prim[0].basevertex = basevertex;
prim[0].num_instances = numInstances;
prim[0].base_instance = baseInstance;
/* Need to give special consideration to rendering a range of
* indices starting somewhere above zero. Typically the
* application is issuing multiple DrawRangeElements() to draw
* successive primitives layed out linearly in the vertex arrays.
* Unless the vertex arrays are all in a VBO (or locked as with
* CVA), the OpenGL semantics imply that we need to re-read or
* re-upload the vertex data on each draw call.
*
* In the case of hardware tnl, we want to avoid starting the
* upload at zero, as it will mean every draw call uploads an
* increasing amount of not-used vertex data. Worse - in the
* software tnl module, all those vertices might be transformed and
* lit but never rendered.
*
* If we just upload or transform the vertices in start..end,
* however, the indices will be incorrect.
*
* At this level, we don't know exactly what the requirements of
* the backend are going to be, though it will likely boil down to
* either:
*
* 1) Do nothing, everything is in a VBO and is processed once
* only.
*
* 2) Adjust the indices and vertex arrays so that start becomes
* zero.
*
* Rather than doing anything here, I'll provide a helper function
* for the latter case elsewhere.
*/
check_buffers_are_unmapped(exec->array.inputs);
vbo_handle_primitive_restart(ctx, prim, 1, &ib,
index_bounds_valid, start, end);
if (MESA_DEBUG_FLAGS & DEBUG_ALWAYS_FLUSH) {
_mesa_flush(ctx);
}
}
/**
* Helper function called by the other DrawArrays() functions below.
* This is where we handle primitive restart for drawing non-indexed
* arrays. If primitive restart is enabled, it typically means
* splitting one DrawArrays() into two.
*/
static void
vbo_draw_arrays(struct gl_context *ctx, GLenum mode, GLint start,
GLsizei count, GLuint numInstances, GLuint baseInstance)
{
struct vbo_context *vbo = vbo_context(ctx);
struct vbo_exec_context *exec = &vbo->exec;
struct _mesa_prim prim[2];
vbo_bind_arrays(ctx);
/* init most fields to zero */
memset(prim, 0, sizeof(prim));
prim[0].begin = 1;
prim[0].end = 1;
prim[0].mode = mode;
prim[0].num_instances = numInstances;
prim[0].base_instance = baseInstance;
/* Implement the primitive restart index */
if (ctx->Array.PrimitiveRestart && ctx->Array.RestartIndex < count) {
GLuint primCount = 0;
if (ctx->Array.RestartIndex == start) {
/* special case: RestartIndex at beginning */
if (count > 1) {
prim[0].start = start + 1;
prim[0].count = count - 1;
primCount = 1;
}
}
else if (ctx->Array.RestartIndex == start + count - 1) {
/* special case: RestartIndex at end */
if (count > 1) {
prim[0].start = start;
prim[0].count = count - 1;
primCount = 1;
}
}
else {
/* general case: RestartIndex in middle, split into two prims */
prim[0].start = start;
prim[0].count = ctx->Array.RestartIndex - start;
prim[1] = prim[0];
prim[1].start = ctx->Array.RestartIndex + 1;
prim[1].count = count - prim[1].start;
primCount = 2;
}
if (primCount > 0) {
/* draw one or two prims */
check_buffers_are_unmapped(exec->array.inputs);
vbo->draw_prims(ctx, prim, primCount, NULL,
GL_TRUE, start, start + count - 1, NULL);
}
}
else {
/* no prim restart */
prim[0].start = start;
prim[0].count = count;
check_buffers_are_unmapped(exec->array.inputs);
vbo->draw_prims(ctx, prim, 1, NULL,
GL_TRUE, start, start + count - 1,
NULL);
}
if (MESA_DEBUG_FLAGS & DEBUG_ALWAYS_FLUSH) {
_mesa_flush(ctx);
}
}
/**
* Inner support for both _mesa_MultiDrawElements() and
* _mesa_MultiDrawRangeElements().
* This does the actual rendering after we've checked array indexes, etc.
*/
static void
vbo_validated_multidrawelements(struct gl_context *ctx, GLenum mode,
const GLsizei *count, GLenum type,
const GLvoid * const *indices,
GLsizei primcount,
const GLint *basevertex)
{
struct vbo_context *vbo = vbo_context(ctx);
struct vbo_exec_context *exec = &vbo->exec;
struct _mesa_index_buffer ib;
struct _mesa_prim *prim;
unsigned int index_type_size = vbo_sizeof_ib_type(type);
uintptr_t min_index_ptr, max_index_ptr;
GLboolean fallback = GL_FALSE;
int i;
if (primcount == 0)
return;
prim = calloc(1, primcount * sizeof(*prim));
if (prim == NULL) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glMultiDrawElements");
return;
}
vbo_bind_arrays(ctx);
min_index_ptr = (uintptr_t)indices[0];
max_index_ptr = 0;
for (i = 0; i < primcount; i++) {
min_index_ptr = MIN2(min_index_ptr, (uintptr_t)indices[i]);
max_index_ptr = MAX2(max_index_ptr, (uintptr_t)indices[i] +
index_type_size * count[i]);
}
/* Check if we can handle this thing as a bunch of index offsets from the
* same index pointer. If we can't, then we have to fall back to doing
* a draw_prims per primitive.
* Check that the difference between each prim's indexes is a multiple of
* the index/element size.
*/
if (index_type_size != 1) {
for (i = 0; i < primcount; i++) {
if ((((uintptr_t)indices[i] - min_index_ptr) % index_type_size) != 0) {
fallback = GL_TRUE;
break;
}
}
}
/* If the index buffer isn't in a VBO, then treating the application's
* subranges of the index buffer as one large index buffer may lead to
* us reading unmapped memory.
*/
if (!_mesa_is_bufferobj(ctx->Array.ArrayObj->ElementArrayBufferObj))
fallback = GL_TRUE;
if (!fallback) {
ib.count = (max_index_ptr - min_index_ptr) / index_type_size;
ib.type = type;
ib.obj = ctx->Array.ArrayObj->ElementArrayBufferObj;
ib.ptr = (void *)min_index_ptr;
for (i = 0; i < primcount; i++) {
prim[i].begin = (i == 0);
prim[i].end = (i == primcount - 1);
prim[i].weak = 0;
prim[i].pad = 0;
prim[i].mode = mode;
prim[i].start = ((uintptr_t)indices[i] - min_index_ptr) / index_type_size;
prim[i].count = count[i];
prim[i].indexed = 1;
prim[i].num_instances = 1;
prim[i].base_instance = 0;
if (basevertex != NULL)
prim[i].basevertex = basevertex[i];
else
prim[i].basevertex = 0;
}
check_buffers_are_unmapped(exec->array.inputs);
vbo_handle_primitive_restart(ctx, prim, primcount, &ib,
GL_FALSE, ~0, ~0);
} else {
/* render one prim at a time */
for (i = 0; i < primcount; i++) {
ib.count = count[i];
ib.type = type;
ib.obj = ctx->Array.ArrayObj->ElementArrayBufferObj;
ib.ptr = indices[i];
prim[0].begin = 1;
prim[0].end = 1;
prim[0].weak = 0;
prim[0].pad = 0;
prim[0].mode = mode;
prim[0].start = 0;
prim[0].count = count[i];
prim[0].indexed = 1;
prim[0].num_instances = 1;
prim[0].base_instance = 0;
if (basevertex != NULL)
prim[0].basevertex = basevertex[i];
else
prim[0].basevertex = 0;
check_buffers_are_unmapped(exec->array.inputs);
vbo_handle_primitive_restart(ctx, prim, 1, &ib,
GL_FALSE, ~0, ~0);
}
}
free(prim);
if (MESA_DEBUG_FLAGS & DEBUG_ALWAYS_FLUSH) {
_mesa_flush(ctx);
}
}
