/*
=====================
RB_T_BasicFog
=====================
*/
static void RB_T_BasicFog( const drawSurf_t *surf ) {
if ( backEnd.currentSpace != surf->space ) {
idPlane local;
GL_SelectTexture( 0 );
R_GlobalPlaneToLocal( surf->space->modelMatrix, fogPlanes[0], local );
local[3] += 0.5;
qglTexGenfv( GL_S, GL_OBJECT_PLANE, local.ToFloatPtr() );
// R_GlobalPlaneToLocal( surf->space->modelMatrix, fogPlanes[1], local );
// local[3] += 0.5;
local[0] = local[1] = local[2] = 0; local[3] = 0.5;
qglTexGenfv( GL_T, GL_OBJECT_PLANE, local.ToFloatPtr() );
GL_SelectTexture( 1 );
// GL_S is constant per viewer
R_GlobalPlaneToLocal( surf->space->modelMatrix, fogPlanes[2], local );
local[3] += FOG_ENTER;
qglTexGenfv( GL_T, GL_OBJECT_PLANE, local.ToFloatPtr() );
R_GlobalPlaneToLocal( surf->space->modelMatrix, fogPlanes[3], local );
qglTexGenfv( GL_S, GL_OBJECT_PLANE, local.ToFloatPtr() );
}
RB_T_RenderTriangleSurface( surf );
}
/*
=====================
RB_T_BlendLight
=====================
*/
static void RB_T_BlendLight( const drawSurf_t *surf ) {
const srfTriangles_t *tri;
tri = surf->geo;
if ( backEnd.currentSpace != surf->space ) {
idPlane lightProject[4];
int i;
for ( i = 0 ; i < 4 ; i++ ) {
R_GlobalPlaneToLocal( surf->space->modelMatrix, backEnd.vLight->lightProject[i], lightProject[i] );
}
GL_SelectTexture( 0 );
qglTexGenfv( GL_S, GL_OBJECT_PLANE, lightProject[0].ToFloatPtr() );
qglTexGenfv( GL_T, GL_OBJECT_PLANE, lightProject[1].ToFloatPtr() );
qglTexGenfv( GL_Q, GL_OBJECT_PLANE, lightProject[2].ToFloatPtr() );
GL_SelectTexture( 1 );
qglTexGenfv( GL_S, GL_OBJECT_PLANE, lightProject[3].ToFloatPtr() );
}
// this gets used for both blend lights and shadow draws
if ( tri->ambientCache ) {
idDrawVert *ac = (idDrawVert *)vertexCache.Position( tri->ambientCache );
qglVertexPointer( 3, GL_FLOAT, sizeof( idDrawVert ), ac->xyz.ToFloatPtr() );
} else if ( tri->shadowCache ) {
shadowCache_t *sc = (shadowCache_t *)vertexCache.Position( tri->shadowCache );
qglVertexPointer( 3, GL_FLOAT, sizeof( shadowCache_t ), sc->xyz.ToFloatPtr() );
}
RB_DrawElementsWithCounters( tri );
}
/*
==================
RB_ARB_DrawInteraction
backEnd.vLight
backEnd.depthFunc must be equal for alpha tested surfaces to work right,
it is set to lessThan for blended transparent surfaces
==================
*/
static void RB_ARB_DrawInteraction( const drawInteraction_t *din ) {
const drawSurf_t *surf = din->surf;
const srfTriangles_t *tri = din->surf->geo;
// set the vertex arrays, which may not all be enabled on a given pass
idDrawVert *ac = (idDrawVert *)vertexCache.Position( tri->ambientCache );
qglVertexPointer( 3, GL_FLOAT, sizeof( idDrawVert ), ac->xyz.ToFloatPtr() );
GL_SelectTexture( 0 );
qglTexCoordPointer( 2, GL_FLOAT, sizeof( idDrawVert ), (void *)&ac->st );
//-----------------------------------------------------
//
// bump / falloff
//
//-----------------------------------------------------
// render light falloff * bumpmap lighting
//
// draw light falloff to the alpha channel
//
GL_State( GLS_COLORMASK | GLS_DEPTHMASK | backEnd.depthFunc );
qglColor3f( 1, 1, 1 );
qglDisableClientState( GL_TEXTURE_COORD_ARRAY );
qglEnable( GL_TEXTURE_GEN_S );
qglTexGenfv( GL_S, GL_OBJECT_PLANE, din->lightProjection[3].ToFloatPtr() );
qglTexCoord2f( 0, 0.5 );
// ATI R100 can't do partial texgens
#define NO_MIXED_TEXGEN
#ifdef NO_MIXED_TEXGEN
idVec4 plane;
plane[0] = 0;
plane[1] = 0;
plane[2] = 0;
plane[3] = 0.5;
qglEnable( GL_TEXTURE_GEN_T );
qglTexGenfv( GL_T, GL_OBJECT_PLANE, plane.ToFloatPtr() );
plane[0] = 0;
plane[1] = 0;
plane[2] = 0;
plane[3] = 1;
qglEnable( GL_TEXTURE_GEN_Q );
qglTexGenfv( GL_Q, GL_OBJECT_PLANE, plane.ToFloatPtr() );
#endif
din->lightFalloffImage->Bind();
// draw it
RB_DrawElementsWithCounters( tri );
qglDisable( GL_TEXTURE_GEN_S );
#ifdef NO_MIXED_TEXGEN
qglDisable( GL_TEXTURE_GEN_T );
qglDisable( GL_TEXTURE_GEN_Q );
#endif
#if 0
GL_State( GLS_SRCBLEND_ONE | GLS_DSTBLEND_ZERO | GLS_DEPTHMASK
| backEnd.depthFunc );
// the texccords are the non-normalized vector towards the light origin
GL_SelectTexture( 0 );
globalImages->normalCubeMapImage->Bind();
qglEnableClientState( GL_TEXTURE_COORD_ARRAY );
qglTexCoordPointer( 3, GL_FLOAT, sizeof( lightingCache_t ), ((lightingCache_t *)vertexCache.Position(tri->lightingCache))->localLightVector.ToFloatPtr() );
// draw it
RB_DrawElementsWithCounters( tri );
return;
#endif
// we can't do bump mapping with standard calls, so skip it
if ( glConfig.envDot3Available && glConfig.cubeMapAvailable ) {
//
// draw the bump map result onto the alpha channel
//
GL_State( GLS_SRCBLEND_DST_ALPHA | GLS_DSTBLEND_ZERO | GLS_COLORMASK | GLS_DEPTHMASK
| backEnd.depthFunc );
// texture 0 will be the per-surface bump map
GL_SelectTexture( 0 );
qglEnableClientState( GL_TEXTURE_COORD_ARRAY );
// FIXME: matrix work! RB_BindStageTexture( surfaceRegs, &surfaceStage->texture, surf );
din->bumpImage->Bind();
// texture 1 is the normalization cube map
// the texccords are the non-normalized vector towards the light origin
GL_SelectTexture( 1 );
if ( din->ambientLight ) {
globalImages->ambientNormalMap->Bind(); // fixed value
} else {
globalImages->normalCubeMapImage->Bind();
}
qglEnableClientState( GL_TEXTURE_COORD_ARRAY );
qglTexCoordPointer( 3, GL_FLOAT, sizeof( lightingCache_t ), ((lightingCache_t *)vertexCache.Position(tri->lightingCache))->localLightVector.ToFloatPtr() );
// I just want alpha = Dot( texture0, texture1 )
GL_TexEnv( GL_COMBINE_ARB );
qglTexEnvi( GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_DOT3_RGBA_ARB );
qglTexEnvi( GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE );
qglTexEnvi( GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB );
qglTexEnvi( GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR );
qglTexEnvi( GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR );
qglTexEnvi( GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1 );
qglTexEnvi( GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1 );
// draw it
RB_DrawElementsWithCounters( tri );
GL_TexEnv( GL_MODULATE );
globalImages->BindNull();
qglDisableClientState( GL_TEXTURE_COORD_ARRAY );
GL_SelectTexture( 0 );
// RB_FinishStageTexture( &surfaceStage->texture, surf );
}
//-----------------------------------------------------
//
// projected light / surface color for diffuse maps
//
//-----------------------------------------------------
// don't trash alpha
GL_State( GLS_SRCBLEND_DST_ALPHA | GLS_DSTBLEND_ONE | GLS_ALPHAMASK | GLS_DEPTHMASK
| backEnd.depthFunc );
// texture 0 will get the surface color texture
GL_SelectTexture( 0 );
// select the vertex color source
if ( din->vertexColor == SVC_IGNORE ) {
qglColor4fv( din->diffuseColor.ToFloatPtr() );
} else {
// FIXME: does this not get diffuseColor blended in?
qglColorPointer( 4, GL_UNSIGNED_BYTE, sizeof( idDrawVert ), (void *)&ac->color );
qglEnableClientState( GL_COLOR_ARRAY );
if ( din->vertexColor == SVC_INVERSE_MODULATE ) {
GL_TexEnv( GL_COMBINE_ARB );
qglTexEnvi( GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE );
qglTexEnvi( GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE );
qglTexEnvi( GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PRIMARY_COLOR_ARB );
qglTexEnvi( GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR );
qglTexEnvi( GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_ONE_MINUS_SRC_COLOR );
qglTexEnvi( GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1 );
}
}
qglEnableClientState( GL_TEXTURE_COORD_ARRAY );
// FIXME: does this not get the texture matrix?
// RB_BindStageTexture( surfaceRegs, &surfaceStage->texture, surf );
din->diffuseImage->Bind();
// texture 1 will get the light projected texture
GL_SelectTexture( 1 );
qglDisableClientState( GL_TEXTURE_COORD_ARRAY );
qglEnable( GL_TEXTURE_GEN_S );
qglEnable( GL_TEXTURE_GEN_T );
qglEnable( GL_TEXTURE_GEN_Q );
qglTexGenfv( GL_S, GL_OBJECT_PLANE, din->lightProjection[0].ToFloatPtr() );
qglTexGenfv( GL_T, GL_OBJECT_PLANE, din->lightProjection[1].ToFloatPtr() );
qglTexGenfv( GL_Q, GL_OBJECT_PLANE, din->lightProjection[2].ToFloatPtr() );
din->lightImage->Bind();
// draw it
RB_DrawElementsWithCounters( tri );
qglDisable( GL_TEXTURE_GEN_S );
qglDisable( GL_TEXTURE_GEN_T );
qglDisable( GL_TEXTURE_GEN_Q );
globalImages->BindNull();
GL_SelectTexture( 0 );
if ( din->vertexColor != SVC_IGNORE ) {
qglDisableClientState( GL_COLOR_ARRAY );
GL_TexEnv( GL_MODULATE );
}
// RB_FinishStageTexture( &surfaceStage->texture, surf );
}
/*
================
RB_PrepareStageTexturing
================
*/
void RB_PrepareStageTexturing( const shaderStage_t *pStage, const drawSurf_t *surf, idDrawVert *ac ) {
// set privatePolygonOffset if necessary
if ( pStage->privatePolygonOffset ) {
qglEnable( GL_POLYGON_OFFSET_FILL );
qglPolygonOffset( r_offsetFactor.GetFloat(), r_offsetUnits.GetFloat() * pStage->privatePolygonOffset );
}
// set the texture matrix if needed
if ( pStage->texture.hasMatrix ) {
RB_LoadShaderTextureMatrix( surf->shaderRegisters, &pStage->texture );
}
// texgens
if ( pStage->texture.texgen == TG_DIFFUSE_CUBE ) {
qglTexCoordPointer( 3, GL_FLOAT, sizeof( idDrawVert ), ac->normal.ToFloatPtr() );
}
if ( pStage->texture.texgen == TG_SKYBOX_CUBE || pStage->texture.texgen == TG_WOBBLESKY_CUBE ) {
qglTexCoordPointer( 3, GL_FLOAT, 0, vertexCache.Position( surf->dynamicTexCoords ) );
}
if ( pStage->texture.texgen == TG_SCREEN ) {
qglEnable( GL_TEXTURE_GEN_S );
qglEnable( GL_TEXTURE_GEN_T );
qglEnable( GL_TEXTURE_GEN_Q );
float mat[16], plane[4];
myGlMultMatrix( surf->space->modelViewMatrix, backEnd.viewDef->projectionMatrix, mat );
plane[0] = mat[0];
plane[1] = mat[4];
plane[2] = mat[8];
plane[3] = mat[12];
qglTexGenfv( GL_S, GL_OBJECT_PLANE, plane );
plane[0] = mat[1];
plane[1] = mat[5];
plane[2] = mat[9];
plane[3] = mat[13];
qglTexGenfv( GL_T, GL_OBJECT_PLANE, plane );
plane[0] = mat[3];
plane[1] = mat[7];
plane[2] = mat[11];
plane[3] = mat[15];
qglTexGenfv( GL_Q, GL_OBJECT_PLANE, plane );
}
if ( pStage->texture.texgen == TG_SCREEN2 ) {
qglEnable( GL_TEXTURE_GEN_S );
qglEnable( GL_TEXTURE_GEN_T );
qglEnable( GL_TEXTURE_GEN_Q );
float mat[16], plane[4];
myGlMultMatrix( surf->space->modelViewMatrix, backEnd.viewDef->projectionMatrix, mat );
plane[0] = mat[0];
plane[1] = mat[4];
plane[2] = mat[8];
plane[3] = mat[12];
qglTexGenfv( GL_S, GL_OBJECT_PLANE, plane );
plane[0] = mat[1];
plane[1] = mat[5];
plane[2] = mat[9];
plane[3] = mat[13];
qglTexGenfv( GL_T, GL_OBJECT_PLANE, plane );
plane[0] = mat[3];
plane[1] = mat[7];
plane[2] = mat[11];
plane[3] = mat[15];
qglTexGenfv( GL_Q, GL_OBJECT_PLANE, plane );
}
if ( pStage->texture.texgen == TG_GLASSWARP ) {
if ( tr.backEndRenderer == BE_ARB2 /*|| tr.backEndRenderer == BE_NV30*/ ) {
qglBindProgramARB( GL_FRAGMENT_PROGRAM_ARB, FPROG_GLASSWARP );
qglEnable( GL_FRAGMENT_PROGRAM_ARB );
GL_SelectTexture( 2 );
globalImages->scratchImage->Bind();
GL_SelectTexture( 1 );
globalImages->scratchImage2->Bind();
qglEnable( GL_TEXTURE_GEN_S );
qglEnable( GL_TEXTURE_GEN_T );
qglEnable( GL_TEXTURE_GEN_Q );
float mat[16], plane[4];
myGlMultMatrix( surf->space->modelViewMatrix, backEnd.viewDef->projectionMatrix, mat );
plane[0] = mat[0];
plane[1] = mat[4];
plane[2] = mat[8];
plane[3] = mat[12];
qglTexGenfv( GL_S, GL_OBJECT_PLANE, plane );
plane[0] = mat[1];
plane[1] = mat[5];
plane[2] = mat[9];
plane[3] = mat[13];
qglTexGenfv( GL_T, GL_OBJECT_PLANE, plane );
plane[0] = mat[3];
plane[1] = mat[7];
plane[2] = mat[11];
plane[3] = mat[15];
qglTexGenfv( GL_Q, GL_OBJECT_PLANE, plane );
GL_SelectTexture( 0 );
}
}
if ( pStage->texture.texgen == TG_REFLECT_CUBE ) {
if ( tr.backEndRenderer == BE_ARB2 ) {
// see if there is also a bump map specified
const shaderStage_t *bumpStage = surf->material->GetBumpStage();
if ( bumpStage ) {
// per-pixel reflection mapping with bump mapping
GL_SelectTexture( 1 );
bumpStage->texture.image->Bind();
GL_SelectTexture( 0 );
qglNormalPointer( GL_FLOAT, sizeof( idDrawVert ), ac->normal.ToFloatPtr() );
qglVertexAttribPointerARB( 10, 3, GL_FLOAT, false, sizeof( idDrawVert ), ac->tangents[1].ToFloatPtr() );
qglVertexAttribPointerARB( 9, 3, GL_FLOAT, false, sizeof( idDrawVert ), ac->tangents[0].ToFloatPtr() );
qglEnableVertexAttribArrayARB( 9 );
qglEnableVertexAttribArrayARB( 10 );
qglEnableClientState( GL_NORMAL_ARRAY );
// Program env 5, 6, 7, 8 have been set in RB_SetProgramEnvironmentSpace
qglBindProgramARB( GL_FRAGMENT_PROGRAM_ARB, FPROG_BUMPY_ENVIRONMENT );
qglEnable( GL_FRAGMENT_PROGRAM_ARB );
qglBindProgramARB( GL_VERTEX_PROGRAM_ARB, VPROG_BUMPY_ENVIRONMENT );
qglEnable( GL_VERTEX_PROGRAM_ARB );
} else {
// per-pixel reflection mapping without a normal map
qglNormalPointer( GL_FLOAT, sizeof( idDrawVert ), ac->normal.ToFloatPtr() );
qglEnableClientState( GL_NORMAL_ARRAY );
qglBindProgramARB( GL_FRAGMENT_PROGRAM_ARB, FPROG_ENVIRONMENT );
qglEnable( GL_FRAGMENT_PROGRAM_ARB );
qglBindProgramARB( GL_VERTEX_PROGRAM_ARB, VPROG_ENVIRONMENT );
qglEnable( GL_VERTEX_PROGRAM_ARB );
}
} else {
qglEnable( GL_TEXTURE_GEN_S );
qglEnable( GL_TEXTURE_GEN_T );
qglEnable( GL_TEXTURE_GEN_R );
qglTexGenf( GL_S, GL_TEXTURE_GEN_MODE, GL_REFLECTION_MAP_EXT );
qglTexGenf( GL_T, GL_TEXTURE_GEN_MODE, GL_REFLECTION_MAP_EXT );
qglTexGenf( GL_R, GL_TEXTURE_GEN_MODE, GL_REFLECTION_MAP_EXT );
qglEnableClientState( GL_NORMAL_ARRAY );
qglNormalPointer( GL_FLOAT, sizeof( idDrawVert ), ac->normal.ToFloatPtr() );
qglMatrixMode( GL_TEXTURE );
float mat[16];
R_TransposeGLMatrix( backEnd.viewDef->worldSpace.modelViewMatrix, mat );
qglLoadMatrixf( mat );
qglMatrixMode( GL_MODELVIEW );
}
}
}
/*
==================
RB_T_FillDepthBuffer
==================
*/
void RB_T_FillDepthBuffer( const drawSurf_t *surf ) {
int stage;
const idMaterial *shader;
const shaderStage_t *pStage;
const float *regs;
float color[4];
const srfTriangles_t *tri;
tri = surf->geo;
shader = surf->material;
// update the clip plane if needed
if ( backEnd.viewDef->numClipPlanes && surf->space != backEnd.currentSpace ) {
GL_SelectTexture( 1 );
idPlane plane;
R_GlobalPlaneToLocal( surf->space->modelMatrix, backEnd.viewDef->clipPlanes[0], plane );
plane[3] += 0.5; // the notch is in the middle
qglTexGenfv( GL_S, GL_OBJECT_PLANE, plane.ToFloatPtr() );
GL_SelectTexture( 0 );
}
if ( !shader->IsDrawn() ) {
return;
}
// some deforms may disable themselves by setting numIndexes = 0
if ( !tri->numIndexes ) {
return;
}
// translucent surfaces don't put anything in the depth buffer and don't
// test against it, which makes them fail the mirror clip plane operation
if ( shader->Coverage() == MC_TRANSLUCENT ) {
return;
}
if ( !tri->ambientCache ) {
common->Printf( "RB_T_FillDepthBuffer: !tri->ambientCache\n" );
return;
}
// get the expressions for conditionals / color / texcoords
regs = surf->shaderRegisters;
// if all stages of a material have been conditioned off, don't do anything
for ( stage = 0; stage < shader->GetNumStages() ; stage++ ) {
pStage = shader->GetStage(stage);
// check the stage enable condition
if ( regs[ pStage->conditionRegister ] != 0 ) {
break;
}
}
if ( stage == shader->GetNumStages() ) {
return;
}
// set polygon offset if necessary
if ( shader->TestMaterialFlag(MF_POLYGONOFFSET) ) {
qglEnable( GL_POLYGON_OFFSET_FILL );
qglPolygonOffset( r_offsetFactor.GetFloat(), r_offsetUnits.GetFloat() * shader->GetPolygonOffset() );
}
// subviews will just down-modulate the color buffer by overbright
if ( shader->GetSort() == SS_SUBVIEW ) {
GL_State( GLS_SRCBLEND_DST_COLOR | GLS_DSTBLEND_ZERO | GLS_DEPTHFUNC_LESS );
color[0] =
color[1] =
color[2] = ( 1.0 / backEnd.overBright );
color[3] = 1;
} else {
// others just draw black
color[0] = 0;
color[1] = 0;
color[2] = 0;
color[3] = 1;
}
idDrawVert *ac = (idDrawVert *)vertexCache.Position( tri->ambientCache );
qglVertexPointer( 3, GL_FLOAT, sizeof( idDrawVert ), ac->xyz.ToFloatPtr() );
qglTexCoordPointer( 2, GL_FLOAT, sizeof( idDrawVert ), reinterpret_cast<void *>(&ac->st) );
bool drawSolid = false;
if ( shader->Coverage() == MC_OPAQUE ) {
drawSolid = true;
}
// we may have multiple alpha tested stages
if ( shader->Coverage() == MC_PERFORATED ) {
// if the only alpha tested stages are condition register omitted,
// draw a normal opaque surface
bool didDraw = false;
qglEnable( GL_ALPHA_TEST );
// perforated surfaces may have multiple alpha tested stages
for ( stage = 0; stage < shader->GetNumStages() ; stage++ ) {
pStage = shader->GetStage(stage);
if ( !pStage->hasAlphaTest ) {
continue;
}
// check the stage enable condition
if ( regs[ pStage->conditionRegister ] == 0 ) {
continue;
}
// if we at least tried to draw an alpha tested stage,
// we won't draw the opaque surface
didDraw = true;
// set the alpha modulate
color[3] = regs[ pStage->color.registers[3] ];
// skip the entire stage if alpha would be black
if ( color[3] <= 0 ) {
continue;
}
qglColor4fv( color );
qglAlphaFunc( GL_GREATER, regs[ pStage->alphaTestRegister ] );
// bind the texture
pStage->texture.image->Bind();
// set texture matrix and texGens
RB_PrepareStageTexturing( pStage, surf, ac );
// draw it
RB_DrawElementsWithCounters( tri );
RB_FinishStageTexturing( pStage, surf, ac );
}
qglDisable( GL_ALPHA_TEST );
if ( !didDraw ) {
drawSolid = true;
}
}
// draw the entire surface solid
if ( drawSolid ) {
qglColor4fv( color );
globalImages->whiteImage->Bind();
// draw it
RB_DrawElementsWithCounters( tri );
}
// reset polygon offset
if ( shader->TestMaterialFlag(MF_POLYGONOFFSET) ) {
qglDisable( GL_POLYGON_OFFSET_FILL );
}
// reset blending
if ( shader->GetSort() == SS_SUBVIEW ) {
GL_State( GLS_DEPTHFUNC_LESS );
}
}
/*
==================
RB_RenderInteraction
backEnd.vLight
backEnd.lightScale
backEnd.depthFunc must be equal for alpha tested surfaces to work right,
it is set to lessThan for blended transparent surfaces
This expects a bumpmap stage before a diffuse stage before a specular stage
The material code is responsible for guaranteeing that, but conditional stages
can still make it invalid.
you can't blend two bumpmaps, but you can change bump maps between
blended diffuse / specular maps to get the same effect
==================
*/
static void RB_RenderInteraction( const drawSurf_t *surf ) {
const idMaterial *surfaceShader = surf->material;
const float *surfaceRegs = surf->shaderRegisters;
const viewLight_t *vLight = backEnd.vLight;
const idMaterial *lightShader = vLight->lightShader;
const float *lightRegs = vLight->shaderRegisters;
static idPlane lightProject[4]; // reused across function calls
const srfTriangles_t *tri = surf->geo;
const shaderStage_t *lastBumpStage = NULL;
RB_LogComment( "---------- RB_RenderInteraction %s on %s ----------\n",
lightShader->GetName(), surfaceShader->GetName() );
// change the matrix and light projection vectors if needed
if ( surf->space != backEnd.currentSpace ) {
backEnd.currentSpace = surf->space;
qglLoadMatrixf( surf->space->modelViewMatrix );
for ( int i = 0 ; i < 4 ; i++ ) {
R_GlobalPlaneToLocal( surf->space->modelMatrix, backEnd.vLight->lightProject[i], lightProject[i] );
}
}
// change the scissor if needed
if ( r_useScissor.GetBool() && !backEnd.currentScissor.Equals( surf->scissorRect ) ) {
backEnd.currentScissor = surf->scissorRect;
qglScissor( backEnd.viewDef->viewport.x1 + backEnd.currentScissor.x1,
backEnd.viewDef->viewport.y1 + backEnd.currentScissor.y1,
backEnd.currentScissor.x2 + 1 - backEnd.currentScissor.x1,
backEnd.currentScissor.y2 + 1 - backEnd.currentScissor.y1 );
}
// hack depth range if needed
if ( surf->space->weaponDepthHack ) {
RB_EnterWeaponDepthHack();
}
if ( surf->space->modelDepthHack != 0.0f ) {
RB_EnterModelDepthHack( surf->space->modelDepthHack );
}
// set the vertex arrays, which may not all be enabled on a given pass
idDrawVert *ac = (idDrawVert *)vertexCache.Position(tri->ambientCache);
qglVertexPointer( 3, GL_FLOAT, sizeof( idDrawVert ), ac->xyz.ToFloatPtr() );
GL_SelectTexture( 0 );
qglTexCoordPointer( 2, GL_FLOAT, sizeof( idDrawVert ), ac->st.ToFloatPtr() );
qglColorPointer( 4, GL_UNSIGNED_BYTE, sizeof( idDrawVert ), ac->color );
// go through the individual stages
for ( int i = 0 ; i < surfaceShader->GetNumStages() ; i++ ) {
const shaderStage_t *surfaceStage = surfaceShader->GetStage( i );
// ignore ambient stages while drawing interactions
if ( surfaceStage->lighting == SL_AMBIENT ) {
continue;
}
// ignore stages that fail the condition
if ( !surfaceRegs[ surfaceStage->conditionRegister ] ) {
continue;
}
//-----------------------------------------------------
//
// bump / falloff
//
//-----------------------------------------------------
if ( surfaceStage->lighting == SL_BUMP ) {
// render light falloff * bumpmap lighting
if ( surfaceStage->vertexColor != SVC_IGNORE ) {
common->Printf( "shader %s: vertexColor on a bump stage\n",
surfaceShader->GetName() );
}
// check for RGBA modulations in the stage, which are also illegal?
// save the bump map stage for the specular calculation and diffuse
// error checking
lastBumpStage = surfaceStage;
//
// ambient lights combine non-directional bump and falloff
// and write to the alpha channel
//
if ( lightShader->IsAmbientLight() ) {
GL_State( GLS_COLORMASK | GLS_DEPTHMASK | backEnd.depthFunc );
// texture 0 will be the per-surface bump map
GL_SelectTexture( 0 );
qglEnableClientState( GL_TEXTURE_COORD_ARRAY );
RB_BindStageTexture( surfaceRegs, &surfaceStage->texture, surf );
// development aid
if ( r_skipBump.GetBool() ) {
globalImages->flatNormalMap->Bind();
}
// texture 1 will be the light falloff
GL_SelectTexture( 1 );
qglEnable( GL_TEXTURE_GEN_S );
qglTexGenfv( GL_S, GL_OBJECT_PLANE, lightProject[3].ToFloatPtr() );
qglTexCoord2f( 0, 0.5 );
vLight->falloffImage->Bind();
qglCombinerParameteriNV( GL_NUM_GENERAL_COMBINERS_NV, 2 );
// set the constant color to a bit of an angle
qglCombinerParameterfvNV( GL_CONSTANT_COLOR0_NV, tr.ambientLightVector.ToFloatPtr() );
// stage 0 sets primary_color = bump dot constant color
qglCombinerInputNV( GL_COMBINER0_NV, GL_RGB, GL_VARIABLE_A_NV,
GL_CONSTANT_COLOR0_NV, GL_EXPAND_NORMAL_NV, GL_RGB );
qglCombinerInputNV( GL_COMBINER0_NV, GL_RGB, GL_VARIABLE_B_NV,
GL_TEXTURE0_ARB, GL_EXPAND_NORMAL_NV, GL_RGB );
qglCombinerOutputNV( GL_COMBINER0_NV, GL_RGB,
GL_PRIMARY_COLOR_NV, GL_DISCARD_NV, GL_DISCARD_NV,
GL_NONE, GL_NONE, GL_TRUE, GL_FALSE, GL_FALSE );
// stage 1 alpha sets primary_color = primary_color * falloff
qglCombinerInputNV( GL_COMBINER1_NV, GL_ALPHA, GL_VARIABLE_A_NV,
GL_PRIMARY_COLOR_NV, GL_UNSIGNED_IDENTITY_NV, GL_BLUE );
qglCombinerInputNV( GL_COMBINER1_NV, GL_ALPHA, GL_VARIABLE_B_NV,
GL_TEXTURE1_ARB, GL_UNSIGNED_IDENTITY_NV, GL_ALPHA );
qglCombinerOutputNV( GL_COMBINER1_NV, GL_ALPHA,
GL_PRIMARY_COLOR_NV, GL_DISCARD_NV, GL_DISCARD_NV,
GL_NONE, GL_NONE, GL_FALSE, GL_FALSE, GL_FALSE );
// final combiner takes the result for the alpha channel
qglFinalCombinerInputNV( GL_VARIABLE_A_NV, GL_ZERO,
GL_UNSIGNED_IDENTITY_NV, GL_RGB );
qglFinalCombinerInputNV( GL_VARIABLE_B_NV, GL_ZERO,
GL_UNSIGNED_IDENTITY_NV, GL_RGB );
qglFinalCombinerInputNV( GL_VARIABLE_C_NV, GL_ZERO,
GL_UNSIGNED_IDENTITY_NV, GL_RGB );
qglFinalCombinerInputNV( GL_VARIABLE_D_NV, GL_ZERO,
GL_UNSIGNED_IDENTITY_NV, GL_RGB );
qglFinalCombinerInputNV( GL_VARIABLE_G_NV, GL_PRIMARY_COLOR_NV,
GL_UNSIGNED_IDENTITY_NV, GL_ALPHA );
// draw it
RB_DrawElementsWithCounters( tri );
globalImages->BindNull();
qglDisable( GL_TEXTURE_GEN_S );
GL_SelectTexture( 0 );
RB_FinishStageTexture( &surfaceStage->texture, surf );
continue;
}
//
// draw light falloff to the alpha channel
//
GL_State( GLS_COLORMASK | GLS_DEPTHMASK | backEnd.depthFunc );
qglDisableClientState( GL_TEXTURE_COORD_ARRAY );
qglDisableClientState( GL_COLOR_ARRAY );
qglEnable( GL_TEXTURE_GEN_S );
qglTexGenfv( GL_S, GL_OBJECT_PLANE, lightProject[3].ToFloatPtr() );
qglTexCoord2f( 0, 0.5 );
vLight->falloffImage->Bind();
// make sure a combiner output doesn't step on the texture
qglCombinerParameteriNV( GL_NUM_GENERAL_COMBINERS_NV, 1 );
qglCombinerOutputNV( GL_COMBINER0_NV, GL_ALPHA,
GL_DISCARD_NV, GL_DISCARD_NV, GL_DISCARD_NV,
GL_NONE, GL_NONE, GL_FALSE, GL_FALSE, GL_FALSE );
// final combiner
qglFinalCombinerInputNV( GL_VARIABLE_A_NV, GL_ZERO,
GL_UNSIGNED_IDENTITY_NV, GL_RGB );
qglFinalCombinerInputNV( GL_VARIABLE_B_NV, GL_ZERO,
GL_UNSIGNED_IDENTITY_NV, GL_RGB );
qglFinalCombinerInputNV( GL_VARIABLE_C_NV, GL_ZERO,
GL_UNSIGNED_IDENTITY_NV, GL_RGB );
qglFinalCombinerInputNV( GL_VARIABLE_D_NV, GL_ZERO,
GL_UNSIGNED_IDENTITY_NV, GL_RGB );
qglFinalCombinerInputNV( GL_VARIABLE_G_NV, GL_TEXTURE0_ARB,
GL_UNSIGNED_IDENTITY_NV, GL_ALPHA );
// draw it
RB_DrawElementsWithCounters( tri );
qglDisable( GL_TEXTURE_GEN_S );
//
// draw the bump map result onto the alpha channel
//
GL_State( GLS_SRCBLEND_DST_ALPHA | GLS_DSTBLEND_ZERO | GLS_COLORMASK | GLS_DEPTHMASK
| backEnd.depthFunc );
// texture 0 will be the per-surface bump map
GL_SelectTexture( 0 );
qglEnableClientState( GL_TEXTURE_COORD_ARRAY );
RB_BindStageTexture( surfaceRegs, &surfaceStage->texture, surf );
// texture 1 is the normalization cube map
// the texccords are the non-normalized vector towards the light origin
GL_SelectTexture( 1 );
globalImages->normalCubeMapImage->Bind();
qglEnableClientState( GL_TEXTURE_COORD_ARRAY );
qglTexCoordPointer( 3, GL_FLOAT, sizeof( lightingCache_t ), ((lightingCache_t *)vertexCache.Position(tri->lightingCache))->localLightVector.ToFloatPtr() );
qglDisableClientState( GL_COLOR_ARRAY );
// program the nvidia register combiners
// I just want alpha = Dot( texture0, texture1 )
qglCombinerParameteriNV( GL_NUM_GENERAL_COMBINERS_NV, 1 );
// stage 0 rgb performs the dot product
// SPARE0 = TEXTURE0 dot TEXTURE1
qglCombinerInputNV( GL_COMBINER0_NV, GL_RGB, GL_VARIABLE_A_NV,
GL_TEXTURE1_ARB, GL_EXPAND_NORMAL_NV, GL_RGB );
qglCombinerInputNV( GL_COMBINER0_NV, GL_RGB, GL_VARIABLE_B_NV,
GL_TEXTURE0_ARB, GL_EXPAND_NORMAL_NV, GL_RGB );
qglCombinerOutputNV( GL_COMBINER0_NV, GL_RGB,
GL_SPARE0_NV, GL_DISCARD_NV, GL_DISCARD_NV,
GL_NONE, GL_NONE, GL_TRUE, GL_FALSE, GL_FALSE );
// final combiner just takes the dot result and puts it in alpha
qglFinalCombinerInputNV( GL_VARIABLE_G_NV, GL_SPARE0_NV,
GL_UNSIGNED_IDENTITY_NV, GL_BLUE );
// draw it
RB_DrawElementsWithCounters( tri );
globalImages->BindNull();
qglDisableClientState( GL_TEXTURE_COORD_ARRAY );
GL_SelectTexture( 0 );
RB_FinishStageTexture( &surfaceStage->texture, surf );
continue;
}
if ( surfaceStage->lighting == SL_DIFFUSE ) {
if ( !lastBumpStage ) {
common->Printf( "shader %s: diffuse stage without a preceeding bumpmap stage\n",
surfaceShader->GetName() );
continue;
}
}
//-----------------------------------------------------
//
// specular exponent modification of the bump / falloff
//
//-----------------------------------------------------
if ( surfaceStage->lighting == SL_SPECULAR ) {
// put specular bump map into alpha channel, then treat as a diffuse
// allow the specular to be skipped as a user speed optimization
if ( r_skipSpecular.GetBool() ) {
continue;
}
// ambient lights don't have specular
if ( lightShader->IsAmbientLight() ) {
continue;
}
if ( !lastBumpStage ) {
common->Printf( "shader %s: specular stage without a preceeding bumpmap stage\n",
surfaceShader->GetName() );
continue;
}
GL_State( GLS_SRCBLEND_DST_ALPHA | GLS_DSTBLEND_SRC_ALPHA | GLS_COLORMASK | GLS_DEPTHMASK
| backEnd.depthFunc );
// texture 0 will be the per-surface bump map
GL_SelectTexture( 0 );
qglEnableClientState( GL_TEXTURE_COORD_ARRAY );
RB_BindStageTexture( surfaceRegs, &lastBumpStage->texture, surf );
// development aid
if ( r_skipBump.GetBool() ) {
globalImages->flatNormalMap->Bind();
}
// texture 1 is the normalization cube map
// indexed by the dynamic halfangle texcoords
GL_SelectTexture( 1 );
globalImages->normalCubeMapImage->Bind();
qglEnableClientState( GL_TEXTURE_COORD_ARRAY );
qglTexCoordPointer( 4, GL_FLOAT, 0, vertexCache.Position( surf->dynamicTexCoords ) );
// program the nvidia register combiners
qglCombinerParameteriNV( GL_NUM_GENERAL_COMBINERS_NV, 2 );
// stage 0 rgb performs the dot product
// GL_PRIMARY_COLOR_NV = ( TEXTURE0 dot TEXTURE1 - 0.5 ) * 2
// the scale and bias steepen the specular curve
qglCombinerInputNV( GL_COMBINER0_NV, GL_RGB, GL_VARIABLE_A_NV,
GL_TEXTURE1_ARB, GL_EXPAND_NORMAL_NV, GL_RGB );
qglCombinerInputNV( GL_COMBINER0_NV, GL_RGB, GL_VARIABLE_B_NV,
GL_TEXTURE0_ARB, GL_EXPAND_NORMAL_NV, GL_RGB );
qglCombinerOutputNV( GL_COMBINER0_NV, GL_RGB,
GL_PRIMARY_COLOR_NV, GL_DISCARD_NV, GL_DISCARD_NV,
GL_SCALE_BY_TWO_NV, GL_BIAS_BY_NEGATIVE_ONE_HALF_NV, GL_TRUE, GL_FALSE, GL_FALSE );
// stage 0 alpha does nothing
qglCombinerOutputNV( GL_COMBINER0_NV, GL_ALPHA,
GL_DISCARD_NV, GL_DISCARD_NV, GL_DISCARD_NV,
GL_NONE, GL_NONE, GL_FALSE, GL_FALSE, GL_FALSE );
// stage 1 rgb does nothing
qglCombinerOutputNV( GL_COMBINER1_NV, GL_RGB,
GL_PRIMARY_COLOR_NV, GL_DISCARD_NV, GL_DISCARD_NV,
GL_NONE, GL_NONE, GL_FALSE, GL_FALSE, GL_FALSE );
// stage 1 alpha takes bump * bump
// PRIMARY_COLOR = ( GL_PRIMARY_COLOR_NV * GL_PRIMARY_COLOR_NV - 0.5 ) * 2
// the scale and bias steepen the specular curve
qglCombinerInputNV( GL_COMBINER1_NV, GL_ALPHA, GL_VARIABLE_A_NV,
GL_PRIMARY_COLOR_NV, GL_UNSIGNED_IDENTITY_NV, GL_BLUE );
qglCombinerInputNV( GL_COMBINER1_NV, GL_ALPHA, GL_VARIABLE_B_NV,
GL_PRIMARY_COLOR_NV, GL_UNSIGNED_IDENTITY_NV, GL_BLUE );
qglCombinerOutputNV( GL_COMBINER1_NV, GL_ALPHA,
GL_PRIMARY_COLOR_NV, GL_DISCARD_NV, GL_DISCARD_NV,
GL_SCALE_BY_TWO_NV, GL_BIAS_BY_NEGATIVE_ONE_HALF_NV, GL_FALSE, GL_FALSE, GL_FALSE );
// final combiner
qglFinalCombinerInputNV( GL_VARIABLE_D_NV, GL_PRIMARY_COLOR_NV,
GL_UNSIGNED_IDENTITY_NV, GL_RGB );
qglFinalCombinerInputNV( GL_VARIABLE_A_NV, GL_ZERO,
GL_UNSIGNED_IDENTITY_NV, GL_RGB );
qglFinalCombinerInputNV( GL_VARIABLE_B_NV, GL_ZERO,
GL_UNSIGNED_IDENTITY_NV, GL_RGB );
qglFinalCombinerInputNV( GL_VARIABLE_C_NV, GL_ZERO,
GL_UNSIGNED_IDENTITY_NV, GL_RGB );
qglFinalCombinerInputNV( GL_VARIABLE_G_NV, GL_PRIMARY_COLOR_NV,
GL_UNSIGNED_IDENTITY_NV, GL_ALPHA );
// draw it
RB_DrawElementsWithCounters( tri );
globalImages->BindNull();
qglDisableClientState( GL_TEXTURE_COORD_ARRAY );
GL_SelectTexture( 0 );
RB_FinishStageTexture( &lastBumpStage->texture, surf );
// the bump map in the alpha channel is now corrupted, so a normal diffuse
// map can't be drawn unless a new bumpmap is put down
lastBumpStage = NULL;
// fall through to the common handling of diffuse and specular projected lighting
}
//-----------------------------------------------------
//
// projected light / surface color for diffuse and specular maps
//
//-----------------------------------------------------
if ( surfaceStage->lighting == SL_DIFFUSE || surfaceStage->lighting == SL_SPECULAR ) {
// don't trash alpha
GL_State( GLS_SRCBLEND_DST_ALPHA | GLS_DSTBLEND_ONE | GLS_ALPHAMASK | GLS_DEPTHMASK
| backEnd.depthFunc );
// texture 0 will get the surface color texture
GL_SelectTexture( 0 );
qglEnableClientState( GL_TEXTURE_COORD_ARRAY );
RB_BindStageTexture( surfaceRegs, &surfaceStage->texture, surf );
// development aid
if ( ( surfaceStage->lighting == SL_DIFFUSE && r_skipDiffuse.GetBool() )
|| ( surfaceStage->lighting == SL_SPECULAR && r_skipSpecular.GetBool() ) ) {
globalImages->blackImage->Bind();
}
// texture 1 will get the light projected texture
GL_SelectTexture( 1 );
qglDisableClientState( GL_TEXTURE_COORD_ARRAY );
qglEnable( GL_TEXTURE_GEN_S );
qglEnable( GL_TEXTURE_GEN_T );
qglEnable( GL_TEXTURE_GEN_Q );
qglTexGenfv( GL_S, GL_OBJECT_PLANE, lightProject[0].ToFloatPtr() );
qglTexGenfv( GL_T, GL_OBJECT_PLANE, lightProject[1].ToFloatPtr() );
qglTexGenfv( GL_Q, GL_OBJECT_PLANE, lightProject[2].ToFloatPtr() );
// texture0 * texture1 * primaryColor * constantColor
qglCombinerParameteriNV( GL_NUM_GENERAL_COMBINERS_NV, 1 );
// SPARE0 = TEXTURE0 * PRIMARY_COLOR
// SPARE1 = TEXTURE1 * CONSTANT_COLOR
qglCombinerInputNV( GL_COMBINER0_NV, GL_RGB, GL_VARIABLE_A_NV,
GL_TEXTURE0_ARB, GL_UNSIGNED_IDENTITY_NV, GL_RGB );
// variable B will be overriden based on the stage vertexColor option
if ( surfaceStage->vertexColor == SVC_MODULATE ) {
qglCombinerInputNV( GL_COMBINER0_NV, GL_RGB, GL_VARIABLE_B_NV,
GL_PRIMARY_COLOR_NV, GL_UNSIGNED_IDENTITY_NV, GL_RGB );
qglEnableClientState( GL_COLOR_ARRAY );
} else if ( surfaceStage->vertexColor == SVC_INVERSE_MODULATE ) {
qglCombinerInputNV( GL_COMBINER0_NV, GL_RGB, GL_VARIABLE_B_NV,
GL_PRIMARY_COLOR_NV, GL_UNSIGNED_INVERT_NV, GL_RGB );
qglEnableClientState( GL_COLOR_ARRAY );
} else { // SVC_IGNORE
qglCombinerInputNV( GL_COMBINER0_NV, GL_RGB, GL_VARIABLE_B_NV,
GL_ZERO, GL_UNSIGNED_INVERT_NV, GL_RGB );
qglDisableClientState( GL_COLOR_ARRAY );
}
qglCombinerInputNV( GL_COMBINER0_NV, GL_RGB, GL_VARIABLE_C_NV,
GL_TEXTURE1_ARB, GL_UNSIGNED_IDENTITY_NV, GL_RGB );
qglCombinerInputNV( GL_COMBINER0_NV, GL_RGB, GL_VARIABLE_D_NV,
GL_CONSTANT_COLOR1_NV, GL_UNSIGNED_IDENTITY_NV, GL_RGB );
qglCombinerOutputNV( GL_COMBINER0_NV, GL_RGB,
GL_SPARE0_NV, GL_SPARE1_NV, GL_DISCARD_NV,
GL_NONE, GL_NONE, GL_FALSE, GL_FALSE, GL_FALSE );
// final combiner
qglFinalCombinerInputNV( GL_VARIABLE_A_NV, GL_SPARE1_NV,
GL_UNSIGNED_IDENTITY_NV, GL_RGB );
qglFinalCombinerInputNV( GL_VARIABLE_B_NV, GL_SPARE0_NV,
GL_UNSIGNED_IDENTITY_NV, GL_RGB );
qglFinalCombinerInputNV( GL_VARIABLE_C_NV, GL_ZERO,
GL_UNSIGNED_IDENTITY_NV, GL_RGB );
qglFinalCombinerInputNV( GL_VARIABLE_D_NV, GL_ZERO,
GL_UNSIGNED_IDENTITY_NV, GL_RGB );
qglFinalCombinerInputNV( GL_VARIABLE_G_NV, GL_ZERO,
GL_UNSIGNED_IDENTITY_NV, GL_ALPHA );
// for all light stages, multiply the projected color by the surface
// color, and blend with the framebuffer
for ( int j = 0 ; j < lightShader->GetNumStages() ; j++ ) {
const shaderStage_t *lightStage = lightShader->GetStage( j );
float color[4];
// ignore stages that fail the condition
if ( !lightRegs[ lightStage->conditionRegister ] ) {
continue;
}
// set the color to the light color times the surface color
color[0] = backEnd.lightScale
* lightRegs[ lightStage->color.registers[0] ]
* surfaceRegs[ surfaceStage->color.registers[0] ];
color[1] = backEnd.lightScale
* lightRegs[ lightStage->color.registers[1] ]
* surfaceRegs[ surfaceStage->color.registers[1] ];
color[2] = backEnd.lightScale
* lightRegs[ lightStage->color.registers[2] ]
* surfaceRegs[ surfaceStage->color.registers[2] ];
color[3] = 1;
// don't draw if it would be all black
if ( color[0] == 0 && color[1] == 0 && color[2] == 0 ) {
continue;
}
qglCombinerParameterfvNV( GL_CONSTANT_COLOR1_NV, color );
RB_BindStageTexture( lightRegs, &lightStage->texture, surf );
RB_DrawElementsWithCounters( tri );
RB_FinishStageTexture( &lightStage->texture, surf );
}
if ( surfaceStage->vertexColor != SVC_IGNORE ) {
qglDisableClientState( GL_COLOR_ARRAY );
}
qglDisable( GL_TEXTURE_GEN_S );
qglDisable( GL_TEXTURE_GEN_T );
qglDisable( GL_TEXTURE_GEN_Q );
globalImages->BindNull();
GL_SelectTexture( 0 );
RB_FinishStageTexture( &surfaceStage->texture, surf );
continue;
}
}
// unhack depth range if needed
if ( surf->space->weaponDepthHack || surf->space->modelDepthHack != 0.0f ) {
RB_LeaveDepthHack();
}
}
