/* glsl_sprite.c Sprite drawing support for GLSL Copyright (C) 2011 Bill Currie Author: Bill Currie Date: 2011/12/30 This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to: Free Software Foundation, Inc. 59 Temple Place - Suite 330 Boston, MA 02111-1307, USA */ #ifdef HAVE_CONFIG_H # include "config.h" #endif static __attribute__ ((used)) const char rcsid[] = "$Id$"; #ifdef HAVE_STRING_H # include #endif #ifdef HAVE_STRINGS_H # include #endif #include "QF/cvar.h" #include "QF/draw.h" #include "QF/dstring.h" #include "QF/quakefs.h" #include "QF/sys.h" #include "QF/vid.h" #include "QF/GLSL/defines.h" #include "QF/GLSL/funcs.h" #include "QF/GLSL/qf_textures.h" #include "QF/GLSL/qf_vid.h" #include "r_local.h" static const char quakesprite_vert[] = #include "quakespr.vc" ; static const char quakesprite_frag[] = #include "quakespr.fc" ; //static float proj_matrix[16]; static struct { int program; shaderparam_t spritea; shaderparam_t spriteb; shaderparam_t palette; shaderparam_t matrix; shaderparam_t vertexa; shaderparam_t vertexb; shaderparam_t uvab; shaderparam_t colora; shaderparam_t colorb; shaderparam_t blend; shaderparam_t fog; } quake_sprite = { 0, {"spritea", 1}, {"spriteb", 1}, {"palette", 1}, {"mvp_mat", 1}, {"vertexa", 0}, {"vertexb", 0}, {"uvab", 0}, {"vcolora", 0}, {"vcolorb", 0}, {"vblend", 0}, {"fog", 1}, }; VISIBLE void R_InitSprites (void) { int frag, vert; vert = GLSL_CompileShader ("quakespr.vert", quakesprite_vert, GL_VERTEX_SHADER); frag = GLSL_CompileShader ("quakespr.frag", quakesprite_frag, GL_FRAGMENT_SHADER); quake_sprite.program = GLSL_LinkProgram ("quakespr", vert, frag); GLSL_ResolveShaderParam (quake_sprite.program, &quake_sprite.spritea); GLSL_ResolveShaderParam (quake_sprite.program, &quake_sprite.spriteb); GLSL_ResolveShaderParam (quake_sprite.program, &quake_sprite.palette); GLSL_ResolveShaderParam (quake_sprite.program, &quake_sprite.matrix); GLSL_ResolveShaderParam (quake_sprite.program, &quake_sprite.vertexa); GLSL_ResolveShaderParam (quake_sprite.program, &quake_sprite.vertexb); GLSL_ResolveShaderParam (quake_sprite.program, &quake_sprite.colora); GLSL_ResolveShaderParam (quake_sprite.program, &quake_sprite.colorb); GLSL_ResolveShaderParam (quake_sprite.program, &quake_sprite.uvab); GLSL_ResolveShaderParam (quake_sprite.program, &quake_sprite.blend); GLSL_ResolveShaderParam (quake_sprite.program, &quake_sprite.fog); } static void R_GetSpriteFrames (entity_t *ent, msprite_t *sprite, mspriteframe_t **frame1, mspriteframe_t **frame2, float *blend) { int framenum = currententity->frame; int pose; int i, numframes; float *intervals; float frame_interval; float fullinterval, targettime, time; mspritegroup_t *group = 0; mspriteframedesc_t *framedesc; if (framenum >= sprite->numframes || framenum < 0) framenum = 0; numframes = sprite->numframes; framedesc = &sprite->frames[framenum]; if (framedesc->type == SPR_SINGLE) { frame_interval = 0.1; pose = framenum; } else { group = (mspritegroup_t *) framedesc->frameptr; intervals = group->intervals; numframes = group->numframes; fullinterval = intervals[numframes - 1]; time = r_realtime + currententity->syncbase; targettime = time - ((int) (time / fullinterval)) * fullinterval; for (i = 0; i < numframes - 1; i++) { if (intervals[i] > targettime) break; } frame_interval = intervals[i]; if (i) frame_interval = intervals[i - 1]; pose = i; } //FIXME this will break if the sprite changes between single frames and //group frames. *blend = R_EntityBlend (ent, pose, frame_interval); if (group) { *frame1 = group->frames[ent->pose1]; *frame2 = group->frames[ent->pose2]; } else { *frame1 = sprite->frames[ent->pose1].frameptr; *frame2 = sprite->frames[ent->pose2].frameptr; } } static void make_quad (mspriteframe_t *frame, const vec3_t vpn, const vec3_t vright, const vec3_t vup, float verts[6][3]) { vec3_t left, up, right, down; vec3_t ul, ur, ll, lr; // build the sprite poster in worldspace // first, rotate the sprite axes into world space VectorScale (vright, frame->right, right); VectorScale (vup, frame->up, up); VectorScale (vright, frame->left, left); VectorScale (vup, frame->down, down); // next, build the sprite corners from the axes VectorAdd (up, left, ul); VectorAdd (up, right, ur); VectorAdd (down, left, ll); VectorAdd (down, right, lr); // finally, translate the sprite corners, creating two triangles VectorAdd (currententity->origin, ul, verts[0]); // first triangle VectorAdd (currententity->origin, ur, verts[1]); VectorAdd (currententity->origin, lr, verts[2]); VectorAdd (currententity->origin, ul, verts[3]); // second triangle VectorAdd (currententity->origin, lr, verts[4]); VectorAdd (currententity->origin, ll, verts[5]); } void R_DrawSprite (void) { entity_t *ent = currententity; msprite_t *sprite = (msprite_t *) ent->model->cache.data; mspriteframe_t *frame1, *frame2; float blend, sr, cr, dot, angle; vec3_t tvec; vec3_t svpn, svright, svup; static quat_t color = { 1, 1, 1, 1}; float vertsa[6][3], vertsb[6][3]; static float uvab[6][4] = { { 0, 0, 0, 0 }, { 1, 0, 1, 0 }, { 1, 1, 1, 1 }, { 0, 0, 0, 0 }, { 1, 1, 1, 1 }, { 0, 1, 0, 1 }, }; switch (sprite->type) { case SPR_FACING_UPRIGHT: // generate the sprite's exes with svup straight up in worldspace // and svright perpendicular to r_origin. This will not work if the // view direction is very close to straight up or down because the // cross product will be between two nearly parallel vectors and // starts to approach an undefined staate, so we don't draw if the // two vectors are less than 1 degree apart VectorNegate (r_origin, tvec); VectorNormalize (tvec); dot = tvec[2]; // same as DotProcut (tvec, svup) because // svup is 0, 0, 1 if ((dot > 0.999848) || (dot < -0.99848)) // cos (1 degree) return; VectorSet (0, 0, 1, svup); // CrossProduct (svup, -r_origin, svright) VectorSet (tvec[1], -tvec[0], 0, svright); VectorNormalize (svright); // CrossProduct (svright, svup, svpn); VectorSet (-svright[1], svright[0], 0, svpn); break; case SPR_VP_PARALLEL: // generate the prite's axes completely parallel to the viewplane. // There are no problem situations, because the prite is always in // the same position relative to the viewer. VectorCopy (vup, svup); VectorCopy (vright, svright); VectorCopy (vpn, svpn); break; case SPR_VP_PARALLEL_UPRIGHT: // generate the sprite's axes with svup straight up in worldspace, // and svright parallel to the viewplane. This will not work if the // view diretion iss very close to straight up or down because the // cross prodcut will be between two nearly parallel vectors and // starts to approach an undefined state, so we don't draw if the // two vectros are less that 1 degree apart dot = vpn[2]; if ((dot > 0.999848) || (dot < -0.99848)) // cos (1 degree) return; VectorSet (0, 0, 1, svup); // CrossProduct (svup, -r_origin, svright) VectorSet (vpn[1], -vpn[0], 0, svright); VectorNormalize (svright); // CrossProduct (svright, svup, svpn); VectorSet (-svright[1], svright[0], 0, svpn); break; case SPR_ORIENTED: // generate the prite's axes according to the sprite's world // orientation VectorCopy (currententity->transform + 0, svpn); VectorNegate (currententity->transform + 4, svright); VectorCopy (currententity->transform + 8, svup); break; case SPR_VP_PARALLEL_ORIENTED: // generate the sprite's axes parallel to the viewplane, but // rotated in that plane round the center according to the sprite // entity's roll angle. Thus svpn stays the same, but svright and // svup rotate angle = currententity->angles[ROLL] * (M_PI / 180); sr = sin (angle); cr = cos (angle); VectorCopy (vpn, svpn); VectorScale (vright, cr, svright); VectorMultAdd (svright, sr, vup, svright); VectorScale (vup, cr, svup); VectorMultAdd (svup, -sr, vright, svup); break; default: Sys_Error ("R_DrawSprite: Bad sprite type %d", sprite->type); } R_GetSpriteFrames (ent, sprite, &frame1, &frame2, &blend); qfglActiveTexture (GL_TEXTURE0 + 0); qfglBindTexture (GL_TEXTURE_2D, frame1->gl_texturenum); qfglActiveTexture (GL_TEXTURE0 + 1); qfglBindTexture (GL_TEXTURE_2D, frame2->gl_texturenum); qfglVertexAttrib4fv (quake_sprite.colora.location, color); qfglVertexAttrib4fv (quake_sprite.colorb.location, color); qfglVertexAttrib1f (quake_sprite.blend.location, blend); make_quad (frame1, svpn, svright, svup, vertsa); make_quad (frame2, svpn, svright, svup, vertsb); qfglVertexAttribPointer (quake_sprite.vertexa.location, 3, GL_FLOAT, 0, 0, vertsa); qfglVertexAttribPointer (quake_sprite.vertexb.location, 3, GL_FLOAT, 0, 0, vertsb); qfglVertexAttribPointer (quake_sprite.uvab.location, 4, GL_FLOAT, 0, 0, uvab); qfglDrawArrays (GL_TRIANGLES, 0, 6); } // All sprites are drawn in a batch, so avoid thrashing the gl state void R_SpriteBegin (void) { mat4_t mat; quat_t fog; qfglUseProgram (quake_sprite.program); qfglEnableVertexAttribArray (quake_sprite.vertexa.location); qfglEnableVertexAttribArray (quake_sprite.vertexb.location); qfglEnableVertexAttribArray (quake_sprite.uvab.location); qfglDisableVertexAttribArray (quake_sprite.colora.location); qfglDisableVertexAttribArray (quake_sprite.colorb.location); qfglDisableVertexAttribArray (quake_sprite.blend.location); VectorCopy (Fog_GetColor (), fog); fog[3] = Fog_GetDensity () / 64.0; qfglUniform4fv (quake_sprite.fog.location, 1, fog); qfglUniform1i (quake_sprite.spritea.location, 0); qfglActiveTexture (GL_TEXTURE0 + 0); qfglEnable (GL_TEXTURE_2D); qfglUniform1i (quake_sprite.spriteb.location, 1); qfglActiveTexture (GL_TEXTURE0 + 1); qfglEnable (GL_TEXTURE_2D); qfglUniform1i (quake_sprite.palette.location, 2); qfglActiveTexture (GL_TEXTURE0 + 2); qfglEnable (GL_TEXTURE_2D); qfglBindTexture (GL_TEXTURE_2D, glsl_palette); Mat4Mult (glsl_projection, glsl_view, mat); qfglUniformMatrix4fv (quake_sprite.matrix.location, 1, false, mat); } void R_SpriteEnd (void) { qfglDisableVertexAttribArray (quake_sprite.vertexa.location); qfglDisableVertexAttribArray (quake_sprite.vertexb.location); qfglDisableVertexAttribArray (quake_sprite.uvab.location); qfglActiveTexture (GL_TEXTURE0 + 0); qfglDisable (GL_TEXTURE_2D); qfglActiveTexture (GL_TEXTURE0 + 1); qfglDisable (GL_TEXTURE_2D); qfglActiveTexture (GL_TEXTURE0 + 2); qfglDisable (GL_TEXTURE_2D); }