/************************************************************************** * * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas. * 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 TUNGSTEN GRAPHICS 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. * **************************************************************************/ /** * quad blending * \author Brian Paul */ #include "glheader.h" #include "imports.h" #include "macros.h" #include "pipe/p_defines.h" #include "sp_context.h" #include "sp_headers.h" #include "sp_surface.h" #include "sp_quad.h" static void blend_quad(struct quad_stage *qs, struct quad_header *quad) { struct softpipe_context *softpipe = qs->softpipe; GLfloat source[4][QUAD_SIZE], dest[4][QUAD_SIZE]; GLuint i, j; /* XXX we're also looping in output_quad() !?! */ /* copy quad's colors since we'll modify them in the loop */ memcpy(source, quad->outputs.color, 4 * 4 * sizeof(GLfloat)); for (i = 0; i < softpipe->framebuffer.num_cbufs; i++) { GLfloat srcTerm[4], dstTerm[4]; struct softpipe_surface *sps = softpipe_surface(softpipe->framebuffer.cbufs[i]); sps->read_quad_f_swz(sps, quad->x0, quad->y0, dest); /* XXX this loop could be factored out - we'd compute the src/dstTerm * for all four pixels in the quad at once. */ for (j = 0; j < QUAD_SIZE; j++) { /* if this pixel in the quad is alive */ if (quad->mask & (1 << j)) { switch (softpipe->blend.rgb_src_factor) { case PIPE_BLENDFACTOR_ONE: srcTerm[0] = srcTerm[1] = srcTerm[2] = 1.0; break; case PIPE_BLENDFACTOR_SRC_ALPHA: srcTerm[0] = srcTerm[1] = srcTerm[2] = quad->outputs.color[3][j]; break; case PIPE_BLENDFACTOR_ZERO: srcTerm[0] = srcTerm[1] = srcTerm[2] = 0.0; break; /* XXX fill in remaining terms */ default: abort(); } switch (softpipe->blend.alpha_src_factor) { case PIPE_BLENDFACTOR_ONE: srcTerm[3] = 1.0; break; case PIPE_BLENDFACTOR_SRC_ALPHA: srcTerm[3] = quad->outputs.color[3][j]; break; case PIPE_BLENDFACTOR_ZERO: srcTerm[3] = 0.0; break; /* XXX fill in remaining terms */ default: abort(); } switch (softpipe->blend.rgb_dst_factor) { case PIPE_BLENDFACTOR_ONE: dstTerm[0] = dstTerm[1] = dstTerm[2] = 1.0; break; case PIPE_BLENDFACTOR_INV_SRC_ALPHA: dstTerm[0] = dstTerm[1] = dstTerm[2] = 1.0 - quad->outputs.color[3][j]; break; case PIPE_BLENDFACTOR_ZERO: dstTerm[0] = dstTerm[1] = dstTerm[2] = 0.0; break; /* XXX fill in remaining terms */ default: abort(); } switch (softpipe->blend.alpha_dst_factor) { case PIPE_BLENDFACTOR_ONE: dstTerm[3] = 1.0; break; case PIPE_BLENDFACTOR_INV_SRC_ALPHA: dstTerm[3] = 1.0 - quad->outputs.color[3][j]; break; case PIPE_BLENDFACTOR_ZERO: dstTerm[3] = 0.0; break; /* XXX fill in remaining terms */ default: abort(); } switch (softpipe->blend.rgb_func) { case PIPE_BLEND_ADD: quad->outputs.color[0][j] = source[0][j] * srcTerm[0] + dest[0][j] * dstTerm[0]; quad->outputs.color[1][j] = source[1][j] * srcTerm[1] + dest[1][j] * dstTerm[1]; quad->outputs.color[2][j] = source[2][j] * srcTerm[2] + dest[2][j] * dstTerm[2]; quad->outputs.color[3][j] = source[3][j] * srcTerm[3] + dest[3][j] * dstTerm[3]; break; case PIPE_BLEND_SUBTRACT: quad->outputs.color[0][j] = source[0][j] * srcTerm[0] - dest[0][j] * dstTerm[0]; quad->outputs.color[1][j] = source[1][j] * srcTerm[1] - dest[1][j] * dstTerm[1]; quad->outputs.color[2][j] = source[2][j] * srcTerm[2] - dest[2][j] * dstTerm[2]; quad->outputs.color[3][j] = source[3][j] * srcTerm[3] - dest[3][j] * dstTerm[3]; break; case PIPE_BLEND_REVERSE_SUBTRACT: quad->outputs.color[0][j] = dest[0][j] * dstTerm[0] - source[0][j] * srcTerm[0]; quad->outputs.color[1][j] = dest[1][j] * dstTerm[1] - source[1][j] * srcTerm[1]; quad->outputs.color[2][j] = dest[2][j] * dstTerm[2] - source[2][j] * srcTerm[2]; quad->outputs.color[3][j] = dest[3][j] * dstTerm[3] - source[3][j] * srcTerm[3]; break; case PIPE_BLEND_MIN: quad->outputs.color[0][j] = MIN2(dest[0][j], source[0][j]); quad->outputs.color[1][j] = MIN2(dest[1][j], source[1][j]); quad->outputs.color[2][j] = MIN2(dest[2][j], source[2][j]); quad->outputs.color[3][j] = MIN2(dest[3][j], source[3][j]); break; case PIPE_BLEND_MAX: quad->outputs.color[0][j] = MAX2(dest[0][j], source[0][j]); quad->outputs.color[1][j] = MAX2(dest[1][j], source[1][j]); quad->outputs.color[2][j] = MAX2(dest[2][j], source[2][j]); quad->outputs.color[3][j] = MAX2(dest[3][j], source[3][j]); break; default: abort(); } } } /* loop over quad's pixels*/ /* pass blended quad to next stage */ qs->next->run(qs->next, quad); } } struct quad_stage *sp_quad_blend_stage( struct softpipe_context *softpipe ) { struct quad_stage *stage = CALLOC_STRUCT(quad_stage); stage->softpipe = softpipe; stage->run = blend_quad; return stage; }