/**
* @brief Developer tool for viewing BSP vertex normals. Only Phong interpolated
* surfaces show their normals when r_shownormals > 1.
*/
void R_DrawBspNormals (int tile)
{
int i, j, k;
const mBspSurface_t* surf;
const mBspModel_t* bsp;
const vec4_t color = {1.0, 0.0, 0.0, 1.0};
if (!r_shownormals->integer)
return;
R_EnableTexture(&texunit_diffuse, false);
R_ResetArrayState(); /* default arrays */
R_Color(color);
k = 0;
bsp = &r_mapTiles[tile]->bsp;
surf = bsp->surfaces;
for (i = 0; i < bsp->numsurfaces; i++, surf++) {
if (surf->frame != r_locals.frame)
continue; /* not visible */
if (surf->texinfo->flags & SURF_WARP)
continue; /* don't care */
if (r_shownormals->integer > 1 && !(surf->texinfo->flags & SURF_PHONG))
continue; /* don't care */
/* avoid overflows, draw in batches */
if (k > r_state.array_size - 512) {
glDrawArrays(GL_LINES, 0, k / 3);
k = 0;
refdef.batchCount++;
}
for (j = 0; j < surf->numedges; j++) {
vec3_t end;
const GLfloat* vertex = &bsp->verts[(surf->index + j) * 3];
const GLfloat* normal = &bsp->normals[(surf->index + j) * 3];
VectorMA(vertex, 12.0, normal, end);
memcpy(&r_state.vertex_array_3d[k], vertex, sizeof(vec3_t));
memcpy(&r_state.vertex_array_3d[k + 3], end, sizeof(vec3_t));
k += sizeof(vec3_t) / sizeof(vec_t) * 2;
R_ReallocateStateArrays(k);
}
}
glDrawArrays(GL_LINES, 0, k / 3);
refdef.batchCount++;
R_EnableTexture(&texunit_diffuse, true);
R_Color(nullptr);
}
/*
* @brief
*/
void R_DrawCoronas(void) {
if (!r_coronas->value)
return;
if (!r_view.num_coronas)
return;
R_EnableTexture(&texunit_diffuse, false);
R_EnableColorArray(true);
R_ResetArrayState();
R_BlendFunc(GL_SRC_ALPHA, GL_ONE);
for (uint16_t i = 0; i < r_view.num_coronas; i++) {
const r_corona_t *c = &r_view.coronas[i];
const vec_t f = c->radius * c->flicker * sin(0.09 * r_view.time);
// use at least 12 verts, more for larger coronas
const uint16_t num_verts = Clamp(c->radius / 8.0, 12, 64);
memcpy(&r_state.color_array[0], c->color, sizeof(vec3_t));
r_state.color_array[3] = r_coronas->value; // set origin color
// and the corner colors
memset(&r_state.color_array[4], 0, num_verts * 2 * sizeof(vec4_t));
memcpy(&r_state.vertex_array_3d[0], c->origin, sizeof(vec3_t));
uint32_t vert_index = 3; // and the origin
for (uint16_t j = 0; j <= num_verts; j++) { // now draw the corners
const vec_t a = j / (vec_t) num_verts * M_PI * 2;
vec3_t v;
VectorCopy(c->origin, v);
VectorMA(v, cos(a) * (c->radius + f), r_view.right, v);
VectorMA(v, sin(a) * (c->radius + f), r_view.up, v);
memcpy(&r_state.vertex_array_3d[vert_index], v, sizeof(vec3_t));
vert_index += 3;
}
glDrawArrays(GL_TRIANGLE_FAN, 0, vert_index / 3);
}
R_BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
R_EnableColorArray(false);
R_EnableTexture(&texunit_diffuse, true);
R_Color(NULL);
}
/**
* @brief Restores renderer state for the given entity.
*/
static void R_ResetMeshShellState_default(const r_entity_t *e) {
if (e->effects & EF_WEAPON) {
R_DepthRange(0.0, 1.0);
}
R_RotateForEntity(NULL);
R_ResetArrayState();
R_UseInterpolation(0.0);
}
/*
* @brief
*/
void R_DrawSkyBox(void) {
const int32_t sky_order[6] = { 0, 2, 1, 3, 4, 5 };
r_bsp_surfaces_t *surfs;
uint32_t i, j;
surfs = &r_model_state.world->bsp->sorted_surfaces->sky;
j = 0;
// first add all visible sky surfaces to the sky bounds
for (i = 0; i < surfs->count; i++) {
if (surfs->surfaces[i]->frame == r_locals.frame) {
R_AddSkySurface(surfs->surfaces[i]);
j++;
}
}
if (!j) // no visible sky surfaces
return;
R_ResetArrayState();
glPushMatrix();
glTranslatef(r_view.origin[0], r_view.origin[1], r_view.origin[2]);
if (r_state.fog_enabled)
glFogf(GL_FOG_END, FOG_END * 8);
r_sky.texcoord_index = r_sky.vert_index = 0;
for (i = 0; i < 6; i++) {
if (r_sky.st_mins[0][i] >= r_sky.st_maxs[0][i] || r_sky.st_mins[1][i]
>= r_sky.st_maxs[1][i])
continue; // nothing on this plane
R_BindTexture(r_sky.images[sky_order[i]]->texnum);
R_MakeSkyVec(r_sky.st_mins[0][i], r_sky.st_mins[1][i], i);
R_MakeSkyVec(r_sky.st_mins[0][i], r_sky.st_maxs[1][i], i);
R_MakeSkyVec(r_sky.st_maxs[0][i], r_sky.st_maxs[1][i], i);
R_MakeSkyVec(r_sky.st_maxs[0][i], r_sky.st_mins[1][i], i);
glDrawArrays(GL_QUADS, 0, r_sky.vert_index / 3);
r_sky.texcoord_index = r_sky.vert_index = 0;
}
if (r_state.fog_enabled)
glFogf(GL_FOG_END, FOG_END);
glPopMatrix();
}
/**
* @param[in] drawFunc The function pointer to the surface draw function
* @param[in] surfType The primary rendering type of the surface
*/
static void R_RenderBspRRefs (drawSurfaceFunc drawFunc, surfaceArrayType_t surfType)
{
glEnable(GL_CULL_FACE);
glCullFace(GL_FRONT); /* our triangles are backwards to what OpenGL expects, so tell it to render only back faces */
for (int i = 0; i < numBspRRefs; i++) {
const bspRenderRef_t* const bspRR = &bspRRefs[i];
const mBspModel_t* const bsp = bspRR->bsp;
const mBspModel_t* const tile = &r_mapTiles[bsp->maptile]->bsp; /* This is required to find the tile (world) bsp model to which arrays belong (submodels do not own arrays, but use world model ones) */
glElementIndex_t* indexPtr;
if (!bsp->sorted_surfaces[surfType]->count)
continue;
R_SetArrayState(tile);
/* Vertex buffers are nullptr-based, arrays are not */
if (qglBindBuffer && r_vertexbuffers->integer)
indexPtr = nullptr;
else
indexPtr = tile->indexes;
glPushMatrix();
glTranslatef(bspRR->origin[0], bspRR->origin[1], bspRR->origin[2]);
glRotatef(bspRR->angles[YAW], 0, 0, 1);
glRotatef(bspRR->angles[PITCH], 0, 1, 0);
glRotatef(bspRR->angles[ROLL], 1, 0, 0);
drawFunc(bsp->sorted_surfaces[surfType], indexPtr);
/** @todo make it work again; also reimplement r_showbox 2 */
#if 0
/* show model bounding box */
if (r_showbox->integer) {
const model_t* model = bspRR->bsp;
R_DrawBoundingBox(model->mins, model->maxs);
}
#endif
glPopMatrix();
}
/* and restore array pointers */
R_ResetArrayState();
glCullFace(GL_BACK);
glDisable(GL_CULL_FACE);
}
static mAliasMesh_t* R_DrawAliasModelBuffer (entity_t *e)
{
mAliasModel_t *mod = &e->model->alias;
mAliasMesh_t* lodMesh;
R_ResetArrayState();
/** @todo what about the origin of a tagged model here? */
lodMesh = R_GetLevelOfDetailForModel(e->origin, mod);
refdef.aliasCount += lodMesh->num_tris;
if (mod->num_frames == 1)
R_DrawAliasStatic(lodMesh, e->shell);
else
R_DrawAliasFrameLerp(mod, lodMesh, e->as.backlerp, e->as.frame, e->as.oldframe, e->shell);
return lodMesh;
}
/*
* @brief Draws all particles for the current frame.
*/
void R_DrawParticles(const r_element_t *e, const size_t count) {
size_t i, j;
R_EnableColorArray(true);
R_ResetArrayState();
// alter the array pointers
R_BindArray(GL_VERTEX_ARRAY, GL_FLOAT, r_particle_state.verts);
R_BindArray(GL_TEXTURE_COORD_ARRAY, GL_FLOAT, r_particle_state.texcoords);
R_BindArray(GL_COLOR_ARRAY, GL_UNSIGNED_BYTE, r_particle_state.colors);
const GLuint base = (uintptr_t) e->data;
for (i = j = 0; i < count; i++, e++) {
const r_particle_t *p = (const r_particle_t *) e->element;
// bind the particle's texture
if (p->image->texnum != texunit_diffuse.texnum) {
if (i > j) { // draw pending particles
glDrawArrays(GL_QUADS, (base + j) * 4, (i - j) * 4);
j = i;
}
R_BindTexture(p->image->texnum);
R_BlendFunc(GL_SRC_ALPHA, p->blend);
}
}
if (i > j) { // draw any remaining particles
glDrawArrays(GL_QUADS, (base + j) * 4, (i - j) * 4);
}
// restore array pointers
R_BindDefaultArray(GL_VERTEX_ARRAY);
R_BindDefaultArray(GL_TEXTURE_COORD_ARRAY);
R_BindDefaultArray(GL_COLOR_ARRAY);
R_BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
R_EnableColorArray(false);
R_Color(NULL);
}
void R_DrawCoronas (void)
{
int i, j, k;
vec3_t v;
if (!r_coronas->integer)
return;
if (!refdef.numCoronas)
return;
R_EnableTexture(&texunit_diffuse, false);
R_EnableColorArray(true);
R_ResetArrayState();
R_BlendFunc(GL_ONE, GL_ONE);
for (k = 0; k < refdef.numCoronas; k++) {
const corona_t *c = &refdef.coronas[k];
int verts, vertind;
if (!c->radius)
continue;
/* use at least 12 verts, more for larger coronas */
verts = 12 + c->radius / 8;
memcpy(&r_state.color_array[0], c->color, sizeof(vec3_t));
r_state.color_array[3] = 1.0f; /* set origin color */
/* and the corner colors */
memset(&r_state.color_array[4], 0, verts * 2 * sizeof(vec4_t));
memcpy(&r_state.vertex_array_3d[0], c->org, sizeof(vec3_t));
vertind = 3; /* and the origin */
for (i = verts; i >= 0; i--) { /* now draw the corners */
const float a = (M_PI * 2 / verts) * i;
for (j = 0; j < 3; j++)
v[j] = c->org[j] + r_locals.right[j] * (float) cos(a) * c->radius + r_locals.up[j] * (float) sin(a)
* c->radius;
memcpy(&r_state.vertex_array_3d[vertind], v, sizeof(vec3_t));
vertind += 3;
}
glDrawArrays(GL_TRIANGLE_FAN, 0, vertind / 3);
refdef.batchCount++;
}
R_BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
R_EnableColorArray(false);
R_EnableTexture(&texunit_diffuse, true);
R_Color(nullptr);
}
/*
* @brief Main entry point for drawing the scene (world and entities).
*/
void R_DrawView(void) {
R_UpdateFrustum();
R_UpdateVis();
R_MarkBspSurfaces();
R_EnableFog(true);
R_DrawSkyBox();
// wait for the client to populate our lights array
Thread_Wait(&r_view.thread);
// now dispatch another thread to cull entities while we draw the world
r_view.thread = Thread_Create(R_CullEntities, NULL);
R_MarkLights();
const r_sorted_bsp_surfaces_t *surfs = r_model_state.world->bsp->sorted_surfaces;
R_DrawOpaqueBspSurfaces(&surfs->opaque);
R_DrawOpaqueWarpBspSurfaces(&surfs->opaque_warp);
R_DrawAlphaTestBspSurfaces(&surfs->alpha_test);
R_EnableBlend(true);
R_DrawBackBspSurfaces(&surfs->back);
R_DrawMaterialBspSurfaces(&surfs->material);
R_DrawFlareBspSurfaces(&surfs->flare);
R_EnableBlend(false);
R_DrawBspNormals();
// ensure the thread has finished culling entities
Thread_Wait(&r_view.thread);
// now dispatch another thread to update particles while we draw entities
r_view.thread = Thread_Create(R_UpdateParticles, NULL);
R_DrawEntities();
R_EnableBlend(true);
R_DrawBspLights();
R_DrawBlendBspSurfaces(&surfs->blend);
R_DrawBlendWarpBspSurfaces(&surfs->blend_warp);
// ensure the thread has finished updating particles
Thread_Wait(&r_view.thread);
R_DrawParticles();
R_EnableFog(false);
R_DrawCoronas();
R_DrawBspLeafs();
R_EnableBlend(false);
R_ResetArrayState();
}
/**
* @brief Iterates the specified surfaces list, updating materials as they are
* encountered, and rendering all visible stages. State is lazily managed
* throughout the iteration, so there is a concerted effort to restore the
* state after all surface stages have been rendered.
*/
void R_DrawMaterialSurfaces (const mBspSurfaces_t *surfs, GLushort *indexPtr)
{
int i;
if (!r_materials->integer || r_wire->integer)
return;
if (!surfs->count)
return;
assert(r_state.blend_enabled);
/** @todo - integrate BSP lighting with model lighting */
R_EnableModelLights(nullptr, 0, false, false);
R_EnableColorArray(true);
R_ResetArrayState();
R_EnableColorArray(false);
R_EnableLighting(nullptr, false);
R_EnableTexture(&texunit_lightmap, false);
#ifndef GL_VERSION_ES_CM_1_0
glEnable(GL_POLYGON_OFFSET_FILL);
#endif
glPolygonOffset(-1.f, -1.f);
glMatrixMode(GL_TEXTURE); /* some stages will manipulate texcoords */
for (i = 0; i < surfs->count; i++) {
materialStage_t *s;
mBspSurface_t *surf = surfs->surfaces[i];
material_t *m = &surf->texinfo->image->material;
int j = -1;
if (surf->frame != r_locals.frame)
continue;
R_UpdateMaterial(m);
for (s = m->stages; s; s = s->next, j--) {
if (!(s->flags & STAGE_RENDER))
continue;
R_SetSurfaceStageState(surf, s);
R_DrawSurfaceStage(surf, s);
}
}
R_Color(nullptr);
/* polygon offset parameters */
glPolygonOffset(0.0, 0.0);
#ifndef GL_VERSION_ES_CM_1_0
glDisable(GL_POLYGON_OFFSET_FILL);
#endif
glLoadIdentity();
glMatrixMode(GL_MODELVIEW);
R_BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
R_EnableFog(true);
R_EnableColorArray(false);
R_EnableTexture(&texunit_lightmap, false);
R_EnableBumpmap(nullptr);
R_EnableLighting(nullptr, false);
R_EnableGlowMap(nullptr);
R_Color(nullptr);
}
/*
* @brief Main entry point for drawing the scene (world and entities).
*/
void R_DrawView(void) {
R_UpdateFrustum();
R_UpdateVis();
R_MarkBspSurfaces();
R_EnableFog(true);
R_DrawSkyBox();
// wait for the client to fully populate the scene
Thread_Wait(r_view.thread);
// dispatch threads to cull entities and sort elements while we draw the world
thread_t *cull_entities = Thread_Create(R_CullEntities, NULL);
thread_t *sort_elements = Thread_Create(R_SortElements, NULL);
R_MarkLights();
const r_sorted_bsp_surfaces_t *surfs = r_model_state.world->bsp->sorted_surfaces;
R_DrawOpaqueBspSurfaces(&surfs->opaque);
R_DrawOpaqueWarpBspSurfaces(&surfs->opaque_warp);
R_DrawAlphaTestBspSurfaces(&surfs->alpha_test);
R_EnableBlend(true);
R_DrawBackBspSurfaces(&surfs->back);
R_DrawMaterialBspSurfaces(&surfs->material);
R_DrawFlareBspSurfaces(&surfs->flare);
R_EnableBlend(false);
// wait for entity culling to complete
Thread_Wait(cull_entities);
R_DrawEntities();
R_EnableBlend(true);
// wait for element sorting to complete
Thread_Wait(sort_elements);
R_DrawElements();
R_EnableFog(false);
R_DrawDeveloperTools();
R_DrawCoronas();
R_EnableBlend(false);
R_ResetArrayState();
#if 0
vec3_t tmp;
VectorMA(r_view.origin, MAX_WORLD_DIST, r_view.forward, tmp);
cm_trace_t tr = Cl_Trace(r_view.origin, tmp, NULL, NULL, cl.client_num + 1, MASK_SOLID);
if (tr.fraction > 0.0 && tr.fraction < 1.0) {
Com_Print("%s: %d: %s\n", tr.surface->name, tr.plane.num, vtos(tr.plane.normal));
}
#endif
}
/**
* @sa R_BeginFrame
* @sa R_EndFrame
*/
void R_RenderFrame (void)
{
R_Setup3D();
/* activate wire mode */
if (r_wire->integer)
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
if (!(refdef.rendererFlags & RDF_NOWORLDMODEL)) {
int tile;
if (r_threads->integer) {
while (r_threadstate.state != THREAD_RENDERER)
Sys_Sleep(0);
r_threadstate.state = THREAD_CLIENT;
} else {
R_SetupFrustum();
/* draw brushes on current worldlevel */
R_GetLevelSurfaceLists();
}
R_UpdateSustainedLights();
R_CheckError();
for (tile = 0; tile < r_numMapTiles; tile++) {
const model_t *mapTile = r_mapTiles[tile];
const mBspModel_t *bsp = &mapTile->bsp;
R_AddBspRRef(bsp, vec3_origin, vec3_origin, false);
}
R_GetEntityLists();
R_EnableFog(true);
R_RenderOpaqueBspRRefs();
R_RenderOpaqueWarpBspRRefs();
R_DrawOpaqueMeshEntities(r_opaque_mesh_entities);
R_RenderAlphaTestBspRRefs();
R_EnableBlend(true);
R_RenderMaterialBspRRefs();
R_EnableFog(false);
R_RenderBlendBspRRefs();
R_RenderBlendWarpBspRRefs();
R_DrawBlendMeshEntities(r_blend_mesh_entities);
R_EnableFog(true);
R_RenderFlareBspRRefs();
R_EnableFog(false);
if (r_debug_lights->integer) {
int i;
for (i = 0; i < refdef.numStaticLights; i++) {
const light_t *l = &refdef.staticLights[i];
R_AddCorona(l->origin, l->radius, l->color);
}
for (i = 0; i < refdef.numDynamicLights; i++) {
const light_t *l = &refdef.dynamicLights[i];
R_AddCorona(l->origin, l->radius, l->color);
}
}
R_DrawCoronas();
R_EnableBlend(false);
for (tile = 0; tile < r_numMapTiles; tile++) {
R_DrawBspNormals(tile);
}
R_Color(NULL);
R_DrawSpecialEntities(r_special_entities);
R_DrawNullEntities(r_null_entities);
R_DrawEntityEffects();
} else {
glClear(GL_DEPTH_BUFFER_BIT);
R_GetEntityLists();
R_RenderOpaqueBspRRefs();
R_RenderOpaqueWarpBspRRefs();
R_DrawOpaqueMeshEntities(r_opaque_mesh_entities);
R_RenderAlphaTestBspRRefs();
R_EnableBlend(true);
R_RenderMaterialBspRRefs();
R_RenderBlendBspRRefs();
R_RenderBlendWarpBspRRefs();
R_DrawBlendMeshEntities(r_blend_mesh_entities);
R_RenderFlareBspRRefs();
R_EnableBlend(false);
R_Color(NULL);
R_DrawSpecialEntities(r_special_entities);
R_DrawNullEntities(r_null_entities);
R_DrawEntityEffects();
}
R_EnableBlend(true);
R_DrawParticles();
R_EnableBlend(false);
/* leave wire mode again */
if (r_wire->integer)
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
R_DrawBloom();
R_DrawBoundingBoxes();
R_ResetArrayState();
/* go back into 2D mode for hud and the like */
R_Setup2D();
R_CheckError();
}
/**
* @brief Re-initializes OpenGL state machine, all textures and renderer variables, this needed when application is put to background on Android.
*/
void R_ReinitOpenglContext (void)
{
/* De-allocate old GL state, these functinos will call glDeleteTexture(), so they should go before everything else */
R_FontCleanCache();
R_ShutdownFBObjects();
R_ShutdownPrograms();
R_BeginBuildingLightmaps(); /* This function will also call glDeleteTexture() */
/* Re-initialize GL state */
R_SetDefaultState();
R_InitPrograms();
R_ResetArrayState();
/* Re-upload all textures */
R_InitMiscTexture();
R_ReloadImages();
/* Re-upload other GL stuff */
R_InitFBObjects();
R_UpdateDefaultMaterial("", "", "", NULL);
/* Re-upload the battlescape terrain geometry */
if (!qglBindBuffer)
return;
for (int tile = 0; tile < r_numMapTiles; tile++) {
model_t *mod = r_mapTiles[tile];
int vertind = 0, coordind = 0, tangind = 0;
mBspSurface_t *surf = mod->bsp.surfaces;
for (int i = 0; i < mod->bsp.numsurfaces; i++, surf++) {
vertind += 3 * surf->numedges;
coordind += 2 * surf->numedges;
tangind += 4 * surf->numedges;
}
qglGenBuffers(1, &mod->bsp.vertex_buffer);
qglBindBuffer(GL_ARRAY_BUFFER, mod->bsp.vertex_buffer);
qglBufferData(GL_ARRAY_BUFFER, vertind * sizeof(GLfloat), mod->bsp.verts, GL_STATIC_DRAW);
qglGenBuffers(1, &mod->bsp.texcoord_buffer);
qglBindBuffer(GL_ARRAY_BUFFER, mod->bsp.texcoord_buffer);
qglBufferData(GL_ARRAY_BUFFER, coordind * sizeof(GLfloat), mod->bsp.texcoords, GL_STATIC_DRAW);
qglGenBuffers(1, &mod->bsp.lmtexcoord_buffer);
qglBindBuffer(GL_ARRAY_BUFFER, mod->bsp.lmtexcoord_buffer);
qglBufferData(GL_ARRAY_BUFFER, coordind * sizeof(GLfloat), mod->bsp.lmtexcoords, GL_STATIC_DRAW);
qglGenBuffers(1, &mod->bsp.normal_buffer);
qglBindBuffer(GL_ARRAY_BUFFER, mod->bsp.normal_buffer);
qglBufferData(GL_ARRAY_BUFFER, vertind * sizeof(GLfloat), mod->bsp.normals, GL_STATIC_DRAW);
qglGenBuffers(1, &mod->bsp.tangent_buffer);
qglBindBuffer(GL_ARRAY_BUFFER, mod->bsp.tangent_buffer);
qglBufferData(GL_ARRAY_BUFFER, tangind * sizeof(GLfloat), mod->bsp.tangents, GL_STATIC_DRAW);
qglGenBuffers(1, &mod->bsp.index_buffer);
qglBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mod->bsp.index_buffer);
qglBufferData(GL_ELEMENT_ARRAY_BUFFER, mod->bsp.numIndexes * sizeof(GLushort), mod->bsp.indexes, GL_STATIC_DRAW);
qglBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
for (int i = 0; i < mod->bsp.numsurfaces; i++)
R_CreateSurfaceLightmap(&mod->bsp.surfaces[i]);
}
R_EndBuildingLightmaps();
qglBindBuffer(GL_ARRAY_BUFFER, 0);
}
/**
* @brief Flares are batched by their texture. Usually, this means one draw operation
* for all flares in view. Flare visibility is calculated every few millis, and
* flare alpha is ramped up or down depending on the results of the visibility
* trace. Flares are also faded according to the angle of their surface to the
* view origin.
*/
void R_DrawFlareSurfaces (const mBspSurfaces_t* surfs, glElementIndex_t* indexPtr)
{
const image_t* image;
int i, j, k, l, m;
vec3_t view, verts[4];
vec3_t right, up, upright, downright;
float dot, dist, scale, alpha;
bool visible;
bool oldblend;
if (!r_flares->integer)
return;
if (!surfs->count)
return;
oldblend = r_state.blend_enabled;
R_EnableColorArray(true);
R_ResetArrayState();
/** @todo better GL state handling */
glDisable(GL_DEPTH_TEST);
R_EnableBlend(true);
R_BlendFunc(GL_SRC_ALPHA, GL_ONE);
image = r_flaretextures[0];
R_BindTexture(image->texnum);
j = k = l = 0;
for (i = 0; i < surfs->count; i++) {
mBspSurface_t* surf = surfs->surfaces[i];
mBspFlare_t* f;
if (surf->frame != r_locals.frame)
continue;
f = surf->flare;
/* bind the flare's texture */
if (f->image != image) {
R_DrawArrays(0, l / 3);
j = k = l = 0;
refdef.batchCount++;
image = f->image;
R_BindTexture(image->texnum);
}
/* periodically test visibility to ramp alpha */
if (refdef.time - f->time > 0.02) {
if (refdef.time - f->time > 0.5) /* reset old flares */
f->alpha = 0;
R_Trace(refdef.viewOrigin, f->origin, 0, MASK_SOLID);
visible = refdef.trace.fraction == 1.0;
f->alpha += (visible ? 0.03 : -0.15); /* ramp */
if (f->alpha > 0.75) /* clamp */
f->alpha = 0.75;
else if (f->alpha < 0)
f->alpha = 0.0;
f->time = refdef.time;
}
VectorSubtract(f->origin, refdef.viewOrigin, view);
dist = VectorNormalize(view);
/* fade according to angle */
dot = DotProduct(surf->normal, view);
if (dot > 0)
continue;
alpha = 0.1 + -dot * r_flares->value;
if (alpha > 1.0)
alpha = 1.0;
alpha = f->alpha * alpha;
/* scale according to distance */
scale = f->radius + (f->radius * dist * .0005);
VectorScale(r_locals.right, scale, right);
VectorScale(r_locals.up, scale, up);
VectorAdd(up, right, upright);
VectorSubtract(right, up, downright);
VectorSubtract(f->origin, downright, verts[0]);
VectorAdd(f->origin, upright, verts[1]);
VectorAdd(f->origin, downright, verts[2]);
VectorSubtract(f->origin, upright, verts[3]);
for (m = 0; m < 4; m++) { /* duplicate color data to all 4 verts */
memcpy(&r_state.color_array[j], f->color, sizeof(vec3_t));
r_state.color_array[j + 3] = alpha;
j += 4;
}
/* copy texcoord info */
memcpy(&texunit_diffuse.texcoord_array[k], default_texcoords, sizeof(vec2_t) * 4);
k += sizeof(vec2_t) / sizeof(vec_t) * 4;
/* and lastly copy the 4 verts */
memcpy(&r_state.vertex_array_3d[l], verts, sizeof(vec3_t) * 4);
l += sizeof(vec3_t) / sizeof(vec_t) * 4;
}
R_DrawArrays(0, l / 3);
refdef.batchCount++;
R_BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
R_EnableBlend(oldblend);
glEnable(GL_DEPTH_TEST);
R_EnableColorArray(false);
R_Color(nullptr);
}
/**
* @brief Draws weather effects
*/
void Weather::render (void)
{
/* Don't play the weather particles if the user doesn't want them */
if (!Cvar_GetInteger("cl_particleweather")) {
return;
}
GLfloat prtPos[3 * 4 * Weather::MAX_PARTICLES];
GLfloat prtTexcoord[2 * 4 * Weather::MAX_PARTICLES];
GLushort prtIndex[3 * 2 * Weather::MAX_PARTICLES];
size_t prtCount = 0;
//const float splashTimeScale = 0.001f / splashTime; /* from msec to 1/sec units, so division is done only once per frame */
/** @todo shadowcasting at least for the sunlight */
#if 0 // disabled because of bizarre colors
vec4_t prtColor = {color[0] * (refdef.ambientColor[0] + refdef.sunDiffuseColor[0]),
color[1] * (refdef.ambientColor[1] + refdef.sunDiffuseColor[1]),
color[2] * (refdef.ambientColor[2] + refdef.sunDiffuseColor[2]),
color[3]};
#else
vec_t prtBrightness = VectorLength(refdef.ambientColor) + VectorLength(refdef.sunDiffuseColor); /** @todo proper color to brightness mapping */
vec4_t prtColor = {color[0] * prtBrightness, color[1] * prtBrightness, color[2] * prtBrightness, color[3]}; /* alpha is not to be scaled */
#endif
for (size_t i = 0; i < Weather::MAX_PARTICLES; i++) {
Weather::particle &prt = particles[i];
if (prt.ttl < 0)
continue;
/* if particle is alive, construct a camera-facing quad */
GLfloat x, y, z;
GLfloat dx, dy, dz;
GLfloat thisParticleSize = particleSize;
if (prt.vz == 0 && splashTime > 0) {
/* splash particle, do zoom and other things */
/** @todo alpha decay */
const float splashFactor = prt.ttl / 500.0f;//1.0f - prt.ttl * splashTimeScale;
thisParticleSize *= (splashSize - 1.0f) * splashFactor + 1.0f;
dx = dy = thisParticleSize;
} else {
dx = i & 1 ? thisParticleSize* 2 : thisParticleSize; dy = i & 1 ? thisParticleSize : thisParticleSize * 2 ; /** @todo make a proper projection instead of this hack */
}
x = prt.x; y = prt.y; z = prt.z;
dz = smearLength * prt.vz * 0.5; /** @todo should use proper velocity vector ... or maybe not */
/* construct a particle geometry; */
GLfloat *pos = &prtPos[3 * 4 * prtCount];
GLfloat *texcoord = &prtTexcoord[2 * 4 * prtCount];
GLushort *idx = &prtIndex[3 * 2 * prtCount];
/** @todo actually rotate billboard in the correct position */
pos[0] = x - dx; pos[1] = y - dy; pos[2] = z + dz * 2;
pos[3] = x + dx; pos[4] = y - dy; pos[5] = z + dz *2;
pos[6] = x + dx; pos[7] = y + dy; pos[8] = z;
pos[9] = x - dx; pos[10] = y + dy; pos[11] = z;
texcoord[0] = 0; texcoord[1] = 0; /* upper left vertex */
texcoord[2] = 1.0f; texcoord[3] = 0; /* upper right vertex */
texcoord[4] = 1.0f; texcoord[5] = 1.0f; /* bottom right vertex */
texcoord[6] = 0; texcoord[7] = 1.0f; /* bottom left vertex */
idx[0] = 4 * prtCount; idx[1] = 4 * prtCount + 1; idx[2] = 4 * prtCount + 2;
idx[3] = 4 * prtCount + 2; idx[4] = 4 * prtCount + 3; idx[5] = 4 * prtCount;
prtCount++;
}
if (prtCount < 1)
return;
/* draw the generated array */
R_Color(prtColor);
glBindTexture(GL_TEXTURE_2D, wpTexture());
R_BindArray(GL_VERTEX_ARRAY, GL_FLOAT, prtPos);
R_BindArray(GL_TEXTURE_COORD_ARRAY, GL_FLOAT, prtTexcoord);
R_EnableBlend(true);
glDrawElements(GL_TRIANGLES, prtCount * 3 * 2, GL_UNSIGNED_SHORT, prtIndex);
R_EnableBlend(false);
R_ResetArrayState();
R_Color(nullptr);
refdef.batchCount++;
}