| /* |
| * Copyright 2010 Marek Olšák <maraeo@gmail.com> |
| * |
| * 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 |
| * on 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 |
| * THE AUTHOR(S) AND/OR THEIR 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. */ |
| |
| /** |
| * The two-sided stencil reference value fallback for r3xx-r4xx chips. |
| * These chips support two-sided stencil functions but they do not support |
| * a two-sided reference value. |
| * |
| * The functions below split every draw call which uses the two-sided |
| * reference value into two draw calls -- the first one renders front faces |
| * and the second renders back faces with the other reference value. |
| */ |
| |
| #include "r300_context.h" |
| #include "r300_reg.h" |
| |
| struct r300_stencilref_context { |
| void (*draw_arrays)(struct pipe_context *pipe, |
| unsigned mode, unsigned start, unsigned count); |
| |
| void (*draw_range_elements)( |
| struct pipe_context *pipe, struct pipe_resource *indexBuffer, |
| unsigned indexSize, int indexBias, unsigned minIndex, unsigned maxIndex, |
| unsigned mode, unsigned start, unsigned count); |
| |
| uint32_t rs_cull_mode; |
| uint32_t zb_stencilrefmask; |
| ubyte ref_value_front; |
| }; |
| |
| static boolean r300_stencilref_needed(struct r300_context *r300) |
| { |
| struct r300_dsa_state *dsa = (struct r300_dsa_state*)r300->dsa_state.state; |
| |
| return dsa->two_sided_stencil_ref || |
| (dsa->two_sided && |
| r300->stencil_ref.ref_value[0] != r300->stencil_ref.ref_value[1]); |
| } |
| |
| /* Set drawing for front faces. */ |
| static void r300_stencilref_begin(struct r300_context *r300) |
| { |
| struct r300_stencilref_context *sr = r300->stencilref_fallback; |
| struct r300_rs_state *rs = (struct r300_rs_state*)r300->rs_state.state; |
| struct r300_dsa_state *dsa = (struct r300_dsa_state*)r300->dsa_state.state; |
| |
| /* Save state. */ |
| sr->rs_cull_mode = rs->cb_main[rs->cull_mode_index]; |
| sr->zb_stencilrefmask = dsa->stencil_ref_mask; |
| sr->ref_value_front = r300->stencil_ref.ref_value[0]; |
| |
| /* We *cull* pixels, therefore no need to mask out the bits. */ |
| rs->cb_main[rs->cull_mode_index] |= R300_CULL_BACK; |
| |
| r300->rs_state.dirty = TRUE; |
| } |
| |
| /* Set drawing for back faces. */ |
| static void r300_stencilref_switch_side(struct r300_context *r300) |
| { |
| struct r300_stencilref_context *sr = r300->stencilref_fallback; |
| struct r300_rs_state *rs = (struct r300_rs_state*)r300->rs_state.state; |
| struct r300_dsa_state *dsa = (struct r300_dsa_state*)r300->dsa_state.state; |
| |
| rs->cb_main[rs->cull_mode_index] = sr->rs_cull_mode | R300_CULL_FRONT; |
| dsa->stencil_ref_mask = dsa->stencil_ref_bf; |
| r300->stencil_ref.ref_value[0] = r300->stencil_ref.ref_value[1]; |
| |
| r300->rs_state.dirty = TRUE; |
| r300->dsa_state.dirty = TRUE; |
| } |
| |
| /* Restore the original state. */ |
| static void r300_stencilref_end(struct r300_context *r300) |
| { |
| struct r300_stencilref_context *sr = r300->stencilref_fallback; |
| struct r300_rs_state *rs = (struct r300_rs_state*)r300->rs_state.state; |
| struct r300_dsa_state *dsa = (struct r300_dsa_state*)r300->dsa_state.state; |
| |
| /* Restore state. */ |
| rs->cb_main[rs->cull_mode_index] = sr->rs_cull_mode; |
| dsa->stencil_ref_mask = sr->zb_stencilrefmask; |
| r300->stencil_ref.ref_value[0] = sr->ref_value_front; |
| |
| r300->rs_state.dirty = TRUE; |
| r300->dsa_state.dirty = TRUE; |
| } |
| |
| static void r300_stencilref_draw_arrays(struct pipe_context *pipe, unsigned mode, |
| unsigned start, unsigned count) |
| { |
| struct r300_context *r300 = r300_context(pipe); |
| struct r300_stencilref_context *sr = r300->stencilref_fallback; |
| |
| if (!r300_stencilref_needed(r300)) { |
| sr->draw_arrays(pipe, mode, start, count); |
| } else { |
| r300_stencilref_begin(r300); |
| sr->draw_arrays(pipe, mode, start, count); |
| r300_stencilref_switch_side(r300); |
| sr->draw_arrays(pipe, mode, start, count); |
| r300_stencilref_end(r300); |
| } |
| } |
| |
| static void r300_stencilref_draw_range_elements( |
| struct pipe_context *pipe, struct pipe_resource *indexBuffer, |
| unsigned indexSize, int indexBias, unsigned minIndex, unsigned maxIndex, |
| unsigned mode, unsigned start, unsigned count) |
| { |
| struct r300_context *r300 = r300_context(pipe); |
| struct r300_stencilref_context *sr = r300->stencilref_fallback; |
| |
| if (!r300_stencilref_needed(r300)) { |
| sr->draw_range_elements(pipe, indexBuffer, indexSize, indexBias, |
| minIndex, maxIndex, mode, start, count); |
| } else { |
| r300_stencilref_begin(r300); |
| sr->draw_range_elements(pipe, indexBuffer, indexSize, indexBias, |
| minIndex, maxIndex, mode, start, count); |
| r300_stencilref_switch_side(r300); |
| sr->draw_range_elements(pipe, indexBuffer, indexSize, indexBias, |
| minIndex, maxIndex, mode, start, count); |
| r300_stencilref_end(r300); |
| } |
| } |
| |
| void r300_plug_in_stencil_ref_fallback(struct r300_context *r300) |
| { |
| r300->stencilref_fallback = CALLOC_STRUCT(r300_stencilref_context); |
| |
| /* Save original draw functions. */ |
| r300->stencilref_fallback->draw_arrays = r300->context.draw_arrays; |
| r300->stencilref_fallback->draw_range_elements = r300->context.draw_range_elements; |
| |
| /* Override the draw functions. */ |
| r300->context.draw_arrays = r300_stencilref_draw_arrays; |
| r300->context.draw_range_elements = r300_stencilref_draw_range_elements; |
| } |