diff options
Diffstat (limited to 'src/mesa/pipe/softpipe/g_tile_fs.c')
| -rw-r--r-- | src/mesa/pipe/softpipe/g_tile_fs.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/src/mesa/pipe/softpipe/g_tile_fs.c b/src/mesa/pipe/softpipe/g_tile_fs.c new file mode 100644 index 0000000000..4c5e6efaed --- /dev/null +++ b/src/mesa/pipe/softpipe/g_tile_fs.c @@ -0,0 +1,203 @@ +/* + * Mesa 3-D graphics library + * Version: 6.5 + * + * Copyright (C) 1999-2005 Brian Paul 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, sublicense, + * 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 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 NONINFRINGEMENT. IN NO EVENT SHALL + * BRIAN PAUL 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. + */ + +/* Vertices are just an array of floats, with all the attributes + * packed. We currently assume a layout like: + * + * attr[0][0..3] - window position + * attr[1..n][0..3] - remaining attributes. + * + * Attributes are assumed to be 4 floats wide but are packed so that + * all the enabled attributes run contiguously. + */ + +#include "glheader.h" +#include "g_context.h" +#include "g_headers.h" +#include "g_tile.h" + +struct exec_machine { + const struct setup_coefficient *coef; + + GLfloat attr[FRAG_ATTRIB_MAX][4][QUAD_SIZE]; +}; + + +/** + * Compute quad's attributes values, as constants (GL_FLAT shading). + */ +static INLINE void cinterp( struct exec_machine *exec, + GLuint attrib, + GLuint i ) +{ + GLuint j; + + for (j = 0; j < QUAD_SIZE; j++) { + exec->attr[attrib][i][j] = exec->coef[attrib].a0[i]; + } +} + + +/** + * Compute quad's attribute values by linear interpolation. + * + * Push into the fp: + * + * INPUT[attr] = MAD COEF_A0[attr], COEF_DADX[attr], INPUT_WPOS.xxxx + * INPUT[attr] = MAD INPUT[attr], COEF_DADY[attr], INPUT_WPOS.yyyy + */ +static INLINE void linterp( struct exec_machine *exec, + GLuint attrib, + GLuint i ) +{ + GLuint j; + + for (j = 0; j < QUAD_SIZE; j++) { + const GLfloat x = exec->attr[FRAG_ATTRIB_WPOS][0][j]; + const GLfloat y = exec->attr[FRAG_ATTRIB_WPOS][1][j]; + exec->attr[attrib][i][j] = (exec->coef[attrib].a0[i] + + exec->coef[attrib].dadx[i] * x + + exec->coef[attrib].dady[i] * y); + } +} + + +/** + * Compute quad's attribute values by linear interpolation with + * perspective correction. + * + * Push into the fp: + * + * INPUT[attr] = MAD COEF_A0[attr], COEF_DADX[attr], INPUT_WPOS.xxxx + * INPUT[attr] = MAD INPUT[attr], COEF_DADY[attr], INPUT_WPOS.yyyy + * INPUT[attr] = MUL INPUT[attr], INPUT_WPOS.wwww + * + * (Or should that be 1/w ???) + */ +static INLINE void pinterp( struct exec_machine *exec, + GLuint attrib, + GLuint i ) +{ + GLuint j; + + for (j = 0; j < QUAD_SIZE; j++) { + const GLfloat x = exec->attr[FRAG_ATTRIB_WPOS][0][j]; + const GLfloat y = exec->attr[FRAG_ATTRIB_WPOS][1][j]; + const GLfloat invW = exec->attr[FRAG_ATTRIB_WPOS][3][j]; + exec->attr[attrib][i][j] = ((exec->coef[attrib].a0[i] + + exec->coef[attrib].dadx[i] * x + + exec->coef[attrib].dady[i] * y) * invW); + } +} + + + +/* This should be done by the fragment shader execution unit (code + * generated from the decl instructions). Do it here for now. + */ +void quad_shade( struct generic_context *generic, + struct quad_header *quad ) +{ + struct exec_machine exec; + GLfloat fx = quad->x0; + GLfloat fy = quad->y0; + GLuint i, j; + + exec.coef = quad->coef; + + /* Position: + */ + exec.attr[FRAG_ATTRIB_WPOS][0][0] = fx; + exec.attr[FRAG_ATTRIB_WPOS][0][1] = fx + 1.0; + exec.attr[FRAG_ATTRIB_WPOS][0][2] = fx; + exec.attr[FRAG_ATTRIB_WPOS][0][3] = fx + 1.0; + + exec.attr[FRAG_ATTRIB_WPOS][1][0] = fy; + exec.attr[FRAG_ATTRIB_WPOS][1][1] = fy; + exec.attr[FRAG_ATTRIB_WPOS][1][2] = fy + 1.0; + exec.attr[FRAG_ATTRIB_WPOS][1][3] = fy + 1.0; + + /* Z and W are done by linear interpolation: + * XXX we'll probably have to use integers for Z + */ + if (generic->need_z) { + linterp(&exec, 0, 2); + } + + if (generic->need_w) { + linterp(&exec, 0, 3); +// invert(&exec, 0, 3); + } + + /* Interpolate all the remaining attributes. This will get pushed + * into the fragment program's responsibilities at some point. + */ + for (i = 1; i < quad->nr_attrs; i++) { +#if 1 + for (j = 0; j < NUM_CHANNELS; j++) + linterp(&exec, i, j); +#else + switch (quad->interp[i]) { + case INTERP_CONSTANT: + for (j = 0; j < NUM_CHANNELS; j++) + cinterp(&exec, i, j); + break; + + case INTERP_LINEAR: + for (j = 0; j < NUM_CHANNELS; j++) + linterp(&exec, i, j); + break; + + case INTERP_PERSPECTIVE: + for (j = 0; j < NUM_CHANNELS; j++) + pinterp(&exec, i, j); + break; + } +#endif + } + +#if 0 + generic->run_fs( tri->fp, quad, &tri->outputs ); +#else + { + GLuint attr = generic->fp_attr_to_slot[FRAG_ATTRIB_COL0]; + assert(attr); + + memcpy(quad->outputs.color, + exec.attr[attr], + sizeof(quad->outputs.color)); + } +#endif + + + if (quad->mask) + quad_output( generic, quad ); +} + + + + + + + |