mirror of
https://gitlab.freedesktop.org/mesa/mesa.git
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Reimplement glRasterPos using the private 'draw' module.
This commit is contained in:
Brian
parent
6a1154bab0
commit
aa880bdfa0
2 changed files with 174 additions and 297 deletions
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@ -25,353 +25,229 @@
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*
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**************************************************************************/
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/*
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* Authors:
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* Brian Paul
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*/
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/**
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* glRasterPos implementation. Basically render a GL_POINT with our
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* private draw module. Plug in a special "rasterpos" stage at the end
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* of the 'draw' pipeline to capture the results and update the current
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* raster pos attributes.
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*
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* Authors:
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* Brian Paul
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*/
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#include "main/imports.h"
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#include "main/feedback.h"
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#include "main/macros.h"
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#include "st_context.h"
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#include "st_atom.h"
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#include "st_cache.h"
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#include "st_draw.h"
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#include "st_program.h"
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#include "st_cb_rasterpos.h"
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#include "st_draw.h"
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#include "st_format.h"
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#include "pipe/p_context.h"
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#include "pipe/p_defines.h"
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#include "pipe/p_winsys.h"
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#include "pipe/draw/draw_context.h"
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#include "pipe/draw/draw_private.h"
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#include "shader/prog_instruction.h"
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#include "vbo/vbo.h"
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/**
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* Our special drawing pipeline stage (replaces rasterization).
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*/
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struct rastpos_stage
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{
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struct draw_stage stage; /**< Base class */
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GLcontext *ctx; /**< Rendering context */
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/* vertex attrib info we can setup once and re-use */
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struct gl_client_array array[VERT_ATTRIB_MAX];
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const struct gl_client_array *arrays[VERT_ATTRIB_MAX];
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struct _mesa_prim prim;
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};
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static INLINE struct rastpos_stage *
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rastpos_stage( struct draw_stage *stage )
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{
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return (struct rastpos_stage *) stage;
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}
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static void
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setup_vertex_attribs(GLcontext *ctx)
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rastpos_begin( struct draw_stage *stage )
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{
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struct pipe_context *pipe = ctx->st->pipe;
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const struct cso_vertex_shader *vs = ctx->st->state.vs;
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const struct st_vertex_program *stvp = ctx->st->vp;
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uint slot;
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/* all attributes come from the default attribute buffer */
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{
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struct pipe_vertex_buffer vbuffer;
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vbuffer.buffer = ctx->st->default_attrib_buffer;
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vbuffer.buffer_offset = 0;
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vbuffer.pitch = 0; /* must be zero! */
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vbuffer.max_index = 1;
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pipe->set_vertex_buffer(pipe, 0, &vbuffer);
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}
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for (slot = 0; slot < vs->state.num_inputs; slot++) {
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struct pipe_vertex_element velement;
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const GLuint attr = stvp->index_to_input[slot];
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velement.src_offset = attr * 4 * sizeof(GLfloat);
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velement.vertex_buffer_index = 0;
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velement.dst_offset = 0;
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velement.src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
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pipe->set_vertex_element(pipe, slot, &velement);
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}
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/* no-op */
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}
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static void
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setup_feedback(GLcontext *ctx)
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rastpos_end( struct draw_stage *stage )
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{
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struct pipe_context *pipe = ctx->st->pipe;
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const struct pipe_shader_state *vs = &ctx->st->state.vs->state;
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struct pipe_feedback_state feedback;
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uint i;
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memset(&feedback, 0, sizeof(feedback));
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feedback.enabled = 1;
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feedback.interleaved = 1;
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feedback.discard = 1;
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feedback.num_attribs = 0;
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/* feedback all results from vertex shader */
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for (i = 0; i < vs->num_outputs; i++) {
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feedback.attrib[feedback.num_attribs] = i;
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feedback.size[feedback.num_attribs] = 4;
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feedback.num_attribs++;
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}
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if (pipe->set_feedback_state)
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pipe->set_feedback_state(pipe, &feedback);
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/* no-op */
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}
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/**
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* Clip a point against the view volume.
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*
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* \param v vertex vector describing the point to clip.
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*
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* \return zero if outside view volume, or one if inside.
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*/
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static GLuint
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viewclip_point( const GLfloat v[] )
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static void
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rastpos_reset_stipple_counter( struct draw_stage *stage )
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{
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if ( v[0] > v[3] || v[0] < -v[3]
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|| v[1] > v[3] || v[1] < -v[3]
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|| v[2] > v[3] || v[2] < -v[3] ) {
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return 0;
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}
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else {
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return 1;
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}
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/* no-op */
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}
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static void
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rastpos_tri( struct draw_stage *stage, struct prim_header *prim )
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{
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/* should never get here */
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assert(0);
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}
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static void
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rastpos_line( struct draw_stage *stage, struct prim_header *prim )
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{
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/* should never get here */
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assert(0);
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}
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/**
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* Clip a point against the far/near Z clipping planes.
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*
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* \param v vertex vector describing the point to clip.
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*
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* \return zero if outside view volume, or one if inside.
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*/
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static GLuint
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viewclip_point_z( const GLfloat v[] )
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{
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if (v[2] > v[3] || v[2] < -v[3] ) {
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return 0;
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}
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else {
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return 1;
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}
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}
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/**
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* Clip a point against the user clipping planes.
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*
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* \param ctx GL context.
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* \param v vertex vector describing the point to clip.
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*
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* \return zero if the point was clipped, or one otherwise.
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*/
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static GLuint
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userclip_point( GLcontext *ctx, const GLfloat v[] )
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{
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GLuint p;
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for (p = 0; p < ctx->Const.MaxClipPlanes; p++) {
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if (ctx->Transform.ClipPlanesEnabled & (1 << p)) {
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GLfloat dot = v[0] * ctx->Transform._ClipUserPlane[p][0]
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+ v[1] * ctx->Transform._ClipUserPlane[p][1]
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+ v[2] * ctx->Transform._ClipUserPlane[p][2]
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+ v[3] * ctx->Transform._ClipUserPlane[p][3];
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if (dot < 0.0F) {
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return 0;
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}
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}
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}
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return 1;
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}
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/**
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* Update the current raster position.
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* Do clip testing, etc. here.
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* Update a raster pos attribute from the vertex result if it's present,
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* else copy the current attrib.
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*/
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static void
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update_rasterpos(GLcontext *ctx,
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const float clipPos[4],
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const float color0[4],
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const float color1[4],
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const float *fog,
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const float *tex)
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update_attrib(GLcontext *ctx, const GLuint *outputMapping,
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const struct vertex_header *vert,
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GLfloat *dest,
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GLuint result, GLuint defaultAttrib)
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{
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uint i;
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float d, ndc[3];
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/* clip to view volume */
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if (ctx->Transform.RasterPositionUnclipped) {
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/* GL_IBM_rasterpos_clip: only clip against Z */
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if (viewclip_point_z(clipPos) == 0) {
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ctx->Current.RasterPosValid = GL_FALSE;
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return;
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}
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}
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else if (viewclip_point(clipPos) == 0) {
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/* Normal OpenGL behaviour */
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ctx->Current.RasterPosValid = GL_FALSE;
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return;
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}
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/* clip to user clipping planes */
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if (ctx->Transform.ClipPlanesEnabled && !userclip_point(ctx, clipPos)) {
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ctx->Current.RasterPosValid = GL_FALSE;
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return;
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}
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const GLfloat *src;
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const GLuint k = outputMapping[result];
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if (k != ~0)
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src = vert->data[k];
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else
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src = ctx->Current.Attrib[defaultAttrib];
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COPY_4V(dest, src);
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}
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/*
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* update current raster position
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*/
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/* ndc = clip / W */
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d = (clipPos[3] == 0.0F) ? 1.0F : 1.0F / clipPos[3];
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ndc[0] = clipPos[0] * d;
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ndc[1] = clipPos[1] * d;
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ndc[2] = clipPos[2] * d;
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/* wincoord = viewport_mapping(ndc) */
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ctx->Current.RasterPos[0] = (ndc[0] * ctx->Viewport._WindowMap.m[MAT_SX]
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+ ctx->Viewport._WindowMap.m[MAT_TX]);
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ctx->Current.RasterPos[1] = (ndc[1] * ctx->Viewport._WindowMap.m[MAT_SY]
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+ ctx->Viewport._WindowMap.m[MAT_TY]);
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ctx->Current.RasterPos[2] = (ndc[2] * ctx->Viewport._WindowMap.m[MAT_SZ]
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+ ctx->Viewport._WindowMap.m[MAT_TZ])
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/ ctx->DrawBuffer->_DepthMaxF;
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ctx->Current.RasterPos[3] = clipPos[3];
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/* compute raster distance */
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#if 0
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if (ctx->Fog.FogCoordinateSource == GL_FOG_COORDINATE_EXT)
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ctx->Current.RasterDistance = ctx->Current.Attrib[VERT_ATTRIB_FOG][0];
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else {
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/* XXX we don't have an eye coord! */
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ctx->Current.RasterDistance =
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SQRTF( eye[0]*eye[0] + eye[1]*eye[1] + eye[2]*eye[2] );
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}
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#else
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ctx->Current.RasterDistance = fog[0];
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#endif
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/* colors and texcoords */
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COPY_4FV(ctx->Current.RasterColor, color0);
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COPY_4FV(ctx->Current.RasterSecondaryColor, color1);
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for (i = 0; i < ctx->Const.MaxTextureCoordUnits; i++) {
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COPY_4FV(ctx->Current.RasterTexCoords + i, tex + i *4);
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}
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/**
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* Normally, this function would render a GL_POINT.
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*/
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static void
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rastpos_point(struct draw_stage *stage, struct prim_header *prim)
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{
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struct rastpos_stage *rs = rastpos_stage(stage);
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GLcontext *ctx = rs->ctx;
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struct st_context *st = ctx->st;
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const GLfloat height = ctx->DrawBuffer->Height;
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const GLuint *outputMapping = st->vertex_result_to_slot;
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const GLfloat *pos;
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GLuint i;
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/* if we get here, we didn't get clipped */
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ctx->Current.RasterPosValid = GL_TRUE;
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if (ctx->RenderMode == GL_SELECT) {
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_mesa_update_hitflag( ctx, ctx->Current.RasterPos[2] );
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/* update raster pos */
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pos = prim->v[0]->data[0];
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ctx->Current.RasterPos[0] = pos[0];
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ctx->Current.RasterPos[1] = height - 1 - pos[1];
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ctx->Current.RasterPos[2] = pos[2];
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ctx->Current.RasterPos[3] = pos[3];
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/* update other raster attribs */
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update_attrib(ctx, outputMapping, prim->v[0],
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ctx->Current.RasterColor,
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VERT_RESULT_COL0, VERT_ATTRIB_COLOR0);
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update_attrib(ctx, outputMapping, prim->v[0],
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ctx->Current.RasterSecondaryColor,
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VERT_RESULT_COL1, VERT_ATTRIB_COLOR1);
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for (i = 0; i < MAX_TEXTURE_UNITS; i++) {
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update_attrib(ctx, outputMapping, prim->v[0],
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ctx->Current.RasterTexCoords[i],
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VERT_RESULT_TEX0 + i, VERT_ATTRIB_TEX0 + i);
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}
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}
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/**
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* Create rasterpos "drawing" stage.
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*/
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static struct rastpos_stage *
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new_draw_rastpos_stage(GLcontext *ctx, struct draw_context *draw)
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{
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struct rastpos_stage *rs = CALLOC_STRUCT(rastpos_stage);
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rs->stage.draw = draw;
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rs->stage.next = NULL;
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rs->stage.begin = rastpos_begin;
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rs->stage.point = rastpos_point;
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rs->stage.line = rastpos_line;
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rs->stage.tri = rastpos_tri;
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rs->stage.end = rastpos_end;
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rs->stage.reset_stipple_counter = rastpos_reset_stipple_counter;
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rs->ctx = ctx;
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return rs;
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}
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static void
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st_RasterPos(GLcontext *ctx, const GLfloat v[4])
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{
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const struct st_context *st = ctx->st;
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struct pipe_context *pipe = st->pipe;
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float *buf_map;
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struct pipe_feedback_buffer fb_buf;
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struct st_context *st = ctx->st;
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struct draw_context *draw = st->draw;
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struct rastpos_stage *rs;
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if (st->rastpos_stage) {
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/* get rastpos stage info */
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rs = rastpos_stage(st->rastpos_stage);
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}
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else {
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/* create rastpos draw stage */
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GLuint i;
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rs = new_draw_rastpos_stage(ctx, draw);
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st->rastpos_stage = &rs->stage;
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/* one-time init */
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for (i = 0; i < VERT_ATTRIB_MAX; i++) {
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rs->array[i].Size = 4;
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rs->array[i].Type = GL_FLOAT;
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rs->array[i].Stride = 0;
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rs->array[i].StrideB = 0;
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rs->array[i].Ptr = (GLubyte *) ctx->Current.Attrib[i];
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rs->array[i].Enabled = GL_TRUE;
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rs->array[i].Normalized = GL_TRUE;
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rs->array[i].BufferObj = NULL;
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rs->arrays[i] = &rs->array[i];
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}
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rs->prim.mode = GL_POINTS;
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rs->prim.indexed = 0;
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rs->prim.begin = 1;
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rs->prim.end = 1;
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rs->prim.weak = 0;
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rs->prim.start = 0;
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rs->prim.count = 1;
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}
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/* plug our rastpos stage into the draw module */
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draw_set_rasterize_stage(st->draw, st->rastpos_stage);
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/* make sure everything's up to date */
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st_validate_state(ctx->st);
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/* setup vertex buffers */
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setup_vertex_attribs(ctx);
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/* This will get set only if rastpos_point(), above, gets called */
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ctx->Current.RasterPosValid = GL_FALSE;
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/*
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* Load the default attribute buffer with current attribs.
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/* All vertex attribs but position were previously initialized above.
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* Just plug in position pointer now.
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*/
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{
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struct pipe_buffer_handle *buf = st->default_attrib_buffer;
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const unsigned size = sizeof(ctx->Current.Attrib);
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const void *data = ctx->Current.Attrib;
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/* colors, texcoords, etc */
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pipe->winsys->buffer_data(pipe->winsys, buf,
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size, data,
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PIPE_BUFFER_USAGE_VERTEX);
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/* position */
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pipe->winsys->buffer_subdata(pipe->winsys, buf,
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0, /* offset */
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4 * sizeof(float), /* size */
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v); /* data */
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}
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rs->array[0].Ptr = (GLubyte *) v;
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/* setup feedback state */
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setup_feedback(ctx);
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/* setup vertex feedback buffer */
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{
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fb_buf.size = 8 * 4 * sizeof(float);
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fb_buf.buffer = pipe->winsys->buffer_create(pipe->winsys, 0);
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fb_buf.start_offset = 0;
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pipe->winsys->buffer_data(pipe->winsys, fb_buf.buffer,
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fb_buf.size,
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NULL, /* data */
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PIPE_BUFFER_USAGE_VERTEX);
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if (pipe->set_feedback_buffer)
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pipe->set_feedback_buffer(pipe, 0, &fb_buf);
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}
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/* draw a point */
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pipe->draw_arrays(pipe, GL_POINTS, 0, 1);
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/* get feedback */
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buf_map = (float *) pipe->winsys->buffer_map(pipe->winsys, fb_buf.buffer,
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PIPE_BUFFER_FLAG_READ);
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/* extract values and update rasterpos state */
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{
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const GLuint *outputMapping = st->vertex_result_to_slot;
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const float *pos, *color0, *color1, *fog, *tex0;
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float *buf = buf_map;
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assert(outputMapping[VERT_RESULT_HPOS] != ~0);
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pos = buf;
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buf += 4;
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if (outputMapping[VERT_RESULT_COL0] != ~0) {
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color0 = buf;
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buf += 4;
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}
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else {
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color0 = ctx->Current.Attrib[VERT_ATTRIB_COLOR0];
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}
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if (outputMapping[VERT_RESULT_COL1] != ~0) {
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color1 = buf;
|
||||
buf += 4;
|
||||
}
|
||||
else {
|
||||
color1 = ctx->Current.Attrib[VERT_ATTRIB_COLOR1];
|
||||
}
|
||||
|
||||
if (outputMapping[VERT_RESULT_FOGC] != ~0) {
|
||||
fog = buf;
|
||||
buf += 4;
|
||||
}
|
||||
else {
|
||||
fog = ctx->Current.Attrib[VERT_ATTRIB_FOG];
|
||||
}
|
||||
|
||||
if (outputMapping[VERT_RESULT_TEX0] != ~0) {
|
||||
tex0 = buf;
|
||||
buf += 4;
|
||||
}
|
||||
else {
|
||||
tex0 = ctx->Current.Attrib[VERT_ATTRIB_TEX0];
|
||||
}
|
||||
|
||||
update_rasterpos(ctx, pos, color0, color1, fog, tex0);
|
||||
}
|
||||
|
||||
/* free vertex feedback buffer */
|
||||
pipe->winsys->buffer_unmap(pipe->winsys, fb_buf.buffer);
|
||||
pipe->winsys->buffer_reference(pipe->winsys, &fb_buf.buffer, NULL);
|
||||
|
||||
/* restore pipe state */
|
||||
if (pipe->set_feedback_state)
|
||||
pipe->set_feedback_state(pipe, &st->state.feedback);
|
||||
/* draw the point */
|
||||
st_feedback_draw_vbo(ctx, rs->arrays, &rs->prim, 1, NULL, 0, 1);
|
||||
}
|
||||
|
||||
|
||||
|
||||
void st_init_rasterpos_functions(struct dd_function_table *functions)
|
||||
{
|
||||
functions->RasterPos = st_RasterPos;
|
||||
|
|
|
|||
|
|
@ -68,9 +68,10 @@ struct st_context
|
|||
|
||||
struct pipe_context *pipe;
|
||||
|
||||
struct draw_context *draw; /**< For selection/feedback */
|
||||
struct draw_context *draw; /**< For selection/feedback/rastpos only */
|
||||
struct draw_stage *feedback_stage; /**< For GL_FEEDBACK rendermode */
|
||||
struct draw_stage *selection_stage; /**< For GL_SELECT rendermode */
|
||||
struct draw_stage *rastpos_stage; /**< For glRasterPos */
|
||||
|
||||
/* Some state is contained in constant objects.
|
||||
* Other state is just parameter values.
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue