281 lines
8.1 KiB
C
281 lines
8.1 KiB
C
/**************************************************************************
|
|
*
|
|
* Copyright 2007 VMware, Inc.
|
|
* All Rights Reserved.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a
|
|
* copy of this software and associated documentation files (the
|
|
* "Software"), to deal in the Software without restriction, including
|
|
* without limitation the rights to use, copy, modify, merge, publish,
|
|
* distribute, sub license, and/or sell copies of the Software, and to
|
|
* permit persons to whom the Software is furnished to do so, subject to
|
|
* the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice (including the
|
|
* next paragraph) shall be included in all copies or substantial portions
|
|
* of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
|
|
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
|
|
* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
|
|
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
|
|
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
|
|
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*
|
|
**************************************************************************/
|
|
|
|
/**
|
|
* glRasterPos implementation. Basically render a GL_POINT with our
|
|
* private draw module. Plug in a special "rasterpos" stage at the end
|
|
* of the 'draw' pipeline to capture the results and update the current
|
|
* raster pos attributes.
|
|
*
|
|
* Authors:
|
|
* Brian Paul
|
|
*/
|
|
|
|
|
|
|
|
#include "main/macros.h"
|
|
#include "main/arrayobj.h"
|
|
#include "main/feedback.h"
|
|
#include "main/framebuffer.h"
|
|
#include "main/rastpos.h"
|
|
#include "main/state.h"
|
|
#include "main/varray.h"
|
|
|
|
#include "util/u_memory.h"
|
|
|
|
#include "st_context.h"
|
|
#include "st_atom.h"
|
|
#include "st_draw.h"
|
|
#include "st_program.h"
|
|
#include "st_cb_rasterpos.h"
|
|
#include "draw/draw_context.h"
|
|
#include "draw/draw_pipe.h"
|
|
#include "vbo/vbo.h"
|
|
|
|
|
|
/**
|
|
* Our special drawing pipeline stage (replaces rasterization).
|
|
*/
|
|
struct rastpos_stage
|
|
{
|
|
struct draw_stage stage; /**< Base class */
|
|
struct gl_context *ctx; /**< Rendering context */
|
|
|
|
/* vertex attrib info we can setup once and re-use */
|
|
struct gl_vertex_array_object *VAO;
|
|
struct _mesa_prim prim;
|
|
};
|
|
|
|
|
|
static inline struct rastpos_stage *
|
|
rastpos_stage( struct draw_stage *stage )
|
|
{
|
|
return (struct rastpos_stage *) stage;
|
|
}
|
|
|
|
static void
|
|
rastpos_flush( struct draw_stage *stage, unsigned flags )
|
|
{
|
|
/* no-op */
|
|
}
|
|
|
|
static void
|
|
rastpos_reset_stipple_counter( struct draw_stage *stage )
|
|
{
|
|
/* no-op */
|
|
}
|
|
|
|
static void
|
|
rastpos_tri( struct draw_stage *stage, struct prim_header *prim )
|
|
{
|
|
/* should never get here */
|
|
assert(0);
|
|
}
|
|
|
|
static void
|
|
rastpos_line( struct draw_stage *stage, struct prim_header *prim )
|
|
{
|
|
/* should never get here */
|
|
assert(0);
|
|
}
|
|
|
|
static void
|
|
rastpos_destroy(struct draw_stage *stage)
|
|
{
|
|
struct rastpos_stage *rstage = (struct rastpos_stage*)stage;
|
|
_mesa_reference_vao(rstage->ctx, &rstage->VAO, NULL);
|
|
FREE(stage);
|
|
}
|
|
|
|
|
|
/**
|
|
* Update a raster pos attribute from the vertex result if it's present,
|
|
* else copy the current attrib.
|
|
*/
|
|
static void
|
|
update_attrib(struct gl_context *ctx, const ubyte *outputMapping,
|
|
const struct vertex_header *vert,
|
|
GLfloat *dest,
|
|
GLuint result, GLuint defaultAttrib)
|
|
{
|
|
const GLfloat *src;
|
|
const ubyte k = outputMapping[result];
|
|
if (k != 0xff)
|
|
src = vert->data[k];
|
|
else
|
|
src = ctx->Current.Attrib[defaultAttrib];
|
|
COPY_4V(dest, src);
|
|
}
|
|
|
|
|
|
/**
|
|
* Normally, this function would render a GL_POINT.
|
|
*/
|
|
static void
|
|
rastpos_point(struct draw_stage *stage, struct prim_header *prim)
|
|
{
|
|
struct rastpos_stage *rs = rastpos_stage(stage);
|
|
struct gl_context *ctx = rs->ctx;
|
|
struct st_context *st = st_context(ctx);
|
|
const GLfloat height = (GLfloat) ctx->DrawBuffer->Height;
|
|
struct gl_vertex_program *stvp = (struct gl_vertex_program *)st->vp;
|
|
const ubyte *outputMapping = stvp->result_to_output;
|
|
const GLfloat *pos;
|
|
GLuint i;
|
|
|
|
ctx->PopAttribState |= GL_CURRENT_BIT;
|
|
|
|
/* if we get here, we didn't get clipped */
|
|
ctx->Current.RasterPosValid = GL_TRUE;
|
|
|
|
/* update raster pos */
|
|
pos = prim->v[0]->data[0];
|
|
ctx->Current.RasterPos[0] = pos[0];
|
|
if (_mesa_fb_orientation(ctx->DrawBuffer) == Y_0_TOP)
|
|
ctx->Current.RasterPos[1] = height - pos[1]; /* invert Y */
|
|
else
|
|
ctx->Current.RasterPos[1] = pos[1];
|
|
ctx->Current.RasterPos[2] = pos[2];
|
|
ctx->Current.RasterPos[3] = pos[3];
|
|
|
|
/* update other raster attribs */
|
|
update_attrib(ctx, outputMapping, prim->v[0],
|
|
ctx->Current.RasterColor,
|
|
VARYING_SLOT_COL0, VERT_ATTRIB_COLOR0);
|
|
|
|
update_attrib(ctx, outputMapping, prim->v[0],
|
|
ctx->Current.RasterSecondaryColor,
|
|
VARYING_SLOT_COL1, VERT_ATTRIB_COLOR1);
|
|
|
|
for (i = 0; i < ctx->Const.MaxTextureCoordUnits; i++) {
|
|
update_attrib(ctx, outputMapping, prim->v[0],
|
|
ctx->Current.RasterTexCoords[i],
|
|
VARYING_SLOT_TEX0 + i, VERT_ATTRIB_TEX0 + i);
|
|
}
|
|
|
|
if (ctx->RenderMode == GL_SELECT) {
|
|
_mesa_update_hitflag( ctx, ctx->Current.RasterPos[2] );
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Create rasterpos "drawing" stage.
|
|
*/
|
|
static struct rastpos_stage *
|
|
new_draw_rastpos_stage(struct gl_context *ctx, struct draw_context *draw)
|
|
{
|
|
struct rastpos_stage *rs = CALLOC_STRUCT(rastpos_stage);
|
|
|
|
rs->stage.draw = draw;
|
|
rs->stage.next = NULL;
|
|
rs->stage.point = rastpos_point;
|
|
rs->stage.line = rastpos_line;
|
|
rs->stage.tri = rastpos_tri;
|
|
rs->stage.flush = rastpos_flush;
|
|
rs->stage.destroy = rastpos_destroy;
|
|
rs->stage.reset_stipple_counter = rastpos_reset_stipple_counter;
|
|
rs->stage.destroy = rastpos_destroy;
|
|
rs->ctx = ctx;
|
|
|
|
rs->VAO = _mesa_new_vao(ctx, ~((GLuint)0));
|
|
_mesa_vertex_attrib_binding(ctx, rs->VAO, VERT_ATTRIB_POS, 0);
|
|
_mesa_update_array_format(ctx, rs->VAO, VERT_ATTRIB_POS, 4, GL_FLOAT,
|
|
GL_RGBA, GL_FALSE, GL_FALSE, GL_FALSE, 0);
|
|
_mesa_enable_vertex_array_attrib(ctx, rs->VAO, 0);
|
|
|
|
rs->prim.mode = GL_POINTS;
|
|
rs->prim.begin = 1;
|
|
rs->prim.end = 1;
|
|
rs->prim.start = 0;
|
|
rs->prim.count = 1;
|
|
|
|
return rs;
|
|
}
|
|
|
|
|
|
void
|
|
st_RasterPos(struct gl_context *ctx, const GLfloat v[4])
|
|
{
|
|
struct st_context *st = st_context(ctx);
|
|
struct draw_context *draw = st_get_draw_context(st);
|
|
struct rastpos_stage *rs;
|
|
|
|
if (!st->draw)
|
|
return;
|
|
|
|
if (ctx->VertexProgram._Current == NULL ||
|
|
ctx->VertexProgram._Current == ctx->VertexProgram._TnlProgram) {
|
|
/* No vertex shader/program is enabled, used the simple/fast fixed-
|
|
* function implementation of RasterPos.
|
|
*/
|
|
_mesa_RasterPos(ctx, v);
|
|
return;
|
|
}
|
|
|
|
if (st->rastpos_stage) {
|
|
/* get rastpos stage info */
|
|
rs = rastpos_stage(st->rastpos_stage);
|
|
}
|
|
else {
|
|
/* create rastpos draw stage */
|
|
rs = new_draw_rastpos_stage(ctx, draw);
|
|
st->rastpos_stage = &rs->stage;
|
|
}
|
|
|
|
/* plug our rastpos stage into the draw module */
|
|
draw_set_rasterize_stage(st->draw, st->rastpos_stage);
|
|
|
|
/* make sure everything's up to date */
|
|
st_validate_state(st, ST_PIPELINE_RENDER);
|
|
|
|
/* This will get set only if rastpos_point(), above, gets called */
|
|
ctx->PopAttribState |= GL_CURRENT_BIT;
|
|
ctx->Current.RasterPosValid = GL_FALSE;
|
|
|
|
/* All vertex attribs but position were previously initialized above.
|
|
* Just plug in position pointer now.
|
|
*/
|
|
rs->VAO->VertexAttrib[VERT_ATTRIB_POS].Ptr = (GLubyte *) v;
|
|
rs->VAO->NewVertexBuffers = true;
|
|
/* Non-dynamic VAOs merge vertex buffers, which changes vertex elements. */
|
|
if (!rs->VAO->IsDynamic)
|
|
rs->VAO->NewVertexElements = true;
|
|
_mesa_set_draw_vao(ctx, rs->VAO, VERT_BIT_POS);
|
|
|
|
/* Draw the point. */
|
|
st_feedback_draw_vbo(ctx, &rs->prim, 1, NULL, true, false, 0, 0, 1, 1, 0);
|
|
|
|
/* restore draw's rasterization stage depending on rendermode */
|
|
if (ctx->RenderMode == GL_FEEDBACK) {
|
|
draw_set_rasterize_stage(draw, st->feedback_stage);
|
|
}
|
|
else if (ctx->RenderMode == GL_SELECT) {
|
|
draw_set_rasterize_stage(draw, st->selection_stage);
|
|
}
|
|
}
|