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qzdoom/src/gl/scene/gl_skydome.cpp
Christoph Oelckers 399d0974ab - added GL render as of SVN revision 1600.
2013-06-23 09:49:34 +02:00

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/*
** gl_sky.cpp
**
** Draws the sky. Loosely based on the JDoom sky and the ZDoomGL 0.66.2 sky.
**
**---------------------------------------------------------------------------
** Copyright 2003 Tim Stump
** Copyright 2005 Christoph Oelckers
** All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
**
** 1. Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
** 3. The name of the author may not be used to endorse or promote products
** derived from this software without specific prior written permission.
** 4. Full disclosure of the entire project's source code, except for third
** party libraries is mandatory. (NOTE: This clause is non-negotiable!)
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**---------------------------------------------------------------------------
**
*/
#include "gl/system/gl_system.h"
#include "doomtype.h"
#include "g_level.h"
#include "sc_man.h"
#include "w_wad.h"
#include "r_state.h"
//#include "gl/gl_intern.h"
#include "gl/data/gl_data.h"
#include "gl/renderer/gl_lightdata.h"
#include "gl/renderer/gl_renderstate.h"
#include "gl/scene/gl_drawinfo.h"
#include "gl/scene/gl_portal.h"
#include "gl/shaders/gl_shader.h"
#include "gl/textures/gl_bitmap.h"
#include "gl/textures/gl_texture.h"
#include "gl/textures/gl_skyboxtexture.h"
#include "gl/textures/gl_material.h"
//-----------------------------------------------------------------------------
//
// Shamelessly lifted from Doomsday (written by Jaakko Ker<65>nen)
// also shamelessly lifted from ZDoomGL! ;)
//
//-----------------------------------------------------------------------------
CVAR (Int, gl_sky_detail, 16, CVAR_ARCHIVE | CVAR_GLOBALCONFIG)
EXTERN_CVAR (Bool, r_stretchsky)
extern int skyfog;
// The texture offset to be applied to the texture coordinates in SkyVertex().
static angle_t maxSideAngle = ANGLE_180 / 3;
static int rows, columns;
static fixed_t scale = 10000 << FRACBITS;
static bool yflip;
static int texw;
static float yAdd;
static bool foglayer;
static bool secondlayer;
static float R,G,B;
static bool skymirror;
#define SKYHEMI_UPPER 0x1
#define SKYHEMI_LOWER 0x2
#define SKYHEMI_JUST_CAP 0x4 // Just draw the top or bottom cap.
//-----------------------------------------------------------------------------
//
//
//
//-----------------------------------------------------------------------------
static void SkyVertex(int r, int c)
{
angle_t topAngle= (angle_t)(c / (float)columns * ANGLE_MAX);
angle_t sideAngle = maxSideAngle * (rows - r) / rows;
fixed_t height = finesine[sideAngle>>ANGLETOFINESHIFT];
fixed_t realRadius = FixedMul(scale, finecosine[sideAngle>>ANGLETOFINESHIFT]);
fixed_t x = FixedMul(realRadius, finecosine[topAngle>>ANGLETOFINESHIFT]);
fixed_t y = (!yflip) ? FixedMul(scale, height) : FixedMul(scale, height) * -1;
fixed_t z = FixedMul(realRadius, finesine[topAngle>>ANGLETOFINESHIFT]);
float fx, fy, fz;
float color = r * 1.f / rows;
float u, v;
float timesRepeat;
timesRepeat = (short)(4 * (256.f / texw));
if (timesRepeat == 0.f) timesRepeat = 1.f;
if (!foglayer)
{
gl_SetColor(255, 0, NULL, r==0? 0.0f : 1.0f);
// And the texture coordinates.
if(!yflip) // Flipped Y is for the lower hemisphere.
{
u = (-timesRepeat * c / (float)columns) ;
v = (r / (float)rows) + yAdd;
}
else
{
u = (-timesRepeat * c / (float)columns) ;
v = 1.0f + ((rows-r)/(float)rows) + yAdd;
}
gl.TexCoord2f(skymirror? -u:u, v);
}
if (r != 4) y+=FRACUNIT*300;
// And finally the vertex.
fx =-FIXED2FLOAT(x); // Doom mirrors the sky vertically!
fy = FIXED2FLOAT(y);
fz = FIXED2FLOAT(z);
gl.Vertex3f(fx, fy - 1.f, fz);
}
//-----------------------------------------------------------------------------
//
// Hemi is Upper or Lower. Zero is not acceptable.
// The current texture is used. SKYHEMI_NO_TOPCAP can be used.
//
//-----------------------------------------------------------------------------
static void RenderSkyHemisphere(int hemi, bool mirror)
{
int r, c;
if (hemi & SKYHEMI_LOWER)
{
yflip = true;
}
else
{
yflip = false;
}
skymirror = mirror;
// The top row (row 0) is the one that's faded out.
// There must be at least 4 columns. The preferable number
// is 4n, where n is 1, 2, 3... There should be at least
// two rows because the first one is always faded.
rows = 4;
if (hemi & SKYHEMI_JUST_CAP)
{
return;
}
// Draw the cap as one solid color polygon
if (!foglayer)
{
columns = 4 * (gl_sky_detail > 0 ? gl_sky_detail : 1);
foglayer=true;
gl_RenderState.EnableTexture(false);
gl_RenderState.Apply(true);
if (!secondlayer)
{
gl.Color3f(R, G ,B);
gl.Begin(GL_TRIANGLE_FAN);
for(c = 0; c < columns; c++)
{
SkyVertex(1, c);
}
gl.End();
}
gl_RenderState.EnableTexture(true);
foglayer=false;
gl_RenderState.Apply();
}
else
{
gl_RenderState.Apply(true);
columns=4; // no need to do more!
gl.Begin(GL_TRIANGLE_FAN);
for(c = 0; c < columns; c++)
{
SkyVertex(0, c);
}
gl.End();
}
// The total number of triangles per hemisphere can be calculated
// as follows: rows * columns * 2 + 2 (for the top cap).
for(r = 0; r < rows; r++)
{
if (yflip)
{
gl.Begin(GL_TRIANGLE_STRIP);
SkyVertex(r + 1, 0);
SkyVertex(r, 0);
for(c = 1; c <= columns; c++)
{
SkyVertex(r + 1, c);
SkyVertex(r, c);
}
gl.End();
}
else
{
gl.Begin(GL_TRIANGLE_STRIP);
SkyVertex(r, 0);
SkyVertex(r + 1, 0);
for(c = 1; c <= columns; c++)
{
SkyVertex(r, c);
SkyVertex(r + 1, c);
}
gl.End();
}
}
}
//-----------------------------------------------------------------------------
//
//
//
//-----------------------------------------------------------------------------
CVAR(Float, skyoffset, 0, 0) // for testing
static void RenderDome(FTextureID texno, FMaterial * tex, float x_offset, float y_offset, bool mirror, int CM_Index)
{
int texh = 0;
bool texscale = false;
// 57 worls units roughly represent one sky texel for the glTranslate call.
const float skyoffsetfactor = 57;
if (tex)
{
gl.PushMatrix();
tex->Bind(CM_Index, 0, 0);
texw = tex->TextureWidth(GLUSE_TEXTURE);
texh = tex->TextureHeight(GLUSE_TEXTURE);
gl.Rotatef(-180.0f+x_offset, 0.f, 1.f, 0.f);
yAdd = y_offset/texh;
if (texh < 200)
{
gl.Translatef(0.f, -1250.f, 0.f);
gl.Scalef(1.f, texh/230.f, 1.f);
}
else if (texh <= 240)
{
gl.Translatef(0.f, (200 - texh + tex->tex->SkyOffset + skyoffset)*skyoffsetfactor, 0.f);
gl.Scalef(1.f, 1.f + ((texh-200.f)/200.f) * 1.17f, 1.f);
}
else
{
gl.Translatef(0.f, (-40 + tex->tex->SkyOffset + skyoffset)*skyoffsetfactor, 0.f);
gl.Scalef(1.f, 1.2f * 1.17f, 1.f);
gl.MatrixMode(GL_TEXTURE);
gl.PushMatrix();
gl.LoadIdentity();
gl.Scalef(1.f, 240.f / texh, 1.f);
gl.MatrixMode(GL_MODELVIEW);
texscale = true;
}
}
if (tex && !secondlayer)
{
PalEntry pe = tex->tex->GetSkyCapColor(false);
if (CM_Index!=CM_DEFAULT) ModifyPalette(&pe, &pe, CM_Index, 1);
R=pe.r/255.0f;
G=pe.g/255.0f;
B=pe.b/255.0f;
if (gl_fixedcolormap)
{
float rr, gg, bb;
gl_GetLightColor(255, 0, NULL, &rr, &gg, &bb);
R*=rr;
G*=gg;
B*=bb;
}
}
RenderSkyHemisphere(SKYHEMI_UPPER, mirror);
if (tex && !secondlayer)
{
PalEntry pe = tex->tex->GetSkyCapColor(true);
if (CM_Index!=CM_DEFAULT) ModifyPalette(&pe, &pe, CM_Index, 1);
R=pe.r/255.0f;
G=pe.g/255.0f;
B=pe.b/255.0f;
if (gl_fixedcolormap != CM_DEFAULT)
{
float rr,gg,bb;
gl_GetLightColor(255, 0, NULL, &rr, &gg, &bb);
R*=rr;
G*=gg;
B*=bb;
}
}
RenderSkyHemisphere(SKYHEMI_LOWER, mirror);
if (texscale)
{
gl.MatrixMode(GL_TEXTURE);
gl.PopMatrix();
gl.MatrixMode(GL_MODELVIEW);
}
if (tex) gl.PopMatrix();
}
//-----------------------------------------------------------------------------
//
//
//
//-----------------------------------------------------------------------------
static void RenderBox(FTextureID texno, FMaterial * gltex, float x_offset, int CM_Index, bool sky2)
{
FSkyBox * sb = static_cast<FSkyBox*>(gltex->tex);
int faces;
FMaterial * tex;
if (!sky2)
gl.Rotatef(-180.0f+x_offset, glset.skyrotatevector.X, glset.skyrotatevector.Z, glset.skyrotatevector.Y);
else
gl.Rotatef(-180.0f+x_offset, glset.skyrotatevector2.X, glset.skyrotatevector2.Z, glset.skyrotatevector2.Y);
gl.Color3f(R, G ,B);
if (sb->faces[5])
{
faces=4;
// north
tex = FMaterial::ValidateTexture(sb->faces[0]);
tex->Bind(CM_Index, GLT_CLAMPX|GLT_CLAMPY, 0);
gl_RenderState.Apply();
gl.Begin(GL_TRIANGLE_FAN);
gl.TexCoord2f(0, 0);
gl.Vertex3f(128.f, 128.f, -128.f);
gl.TexCoord2f(1, 0);
gl.Vertex3f(-128.f, 128.f, -128.f);
gl.TexCoord2f(1, 1);
gl.Vertex3f(-128.f, -128.f, -128.f);
gl.TexCoord2f(0, 1);
gl.Vertex3f(128.f, -128.f, -128.f);
gl.End();
// east
tex = FMaterial::ValidateTexture(sb->faces[1]);
tex->Bind(CM_Index, GLT_CLAMPX|GLT_CLAMPY, 0);
gl_RenderState.Apply();
gl.Begin(GL_TRIANGLE_FAN);
gl.TexCoord2f(0, 0);
gl.Vertex3f(-128.f, 128.f, -128.f);
gl.TexCoord2f(1, 0);
gl.Vertex3f(-128.f, 128.f, 128.f);
gl.TexCoord2f(1, 1);
gl.Vertex3f(-128.f, -128.f, 128.f);
gl.TexCoord2f(0, 1);
gl.Vertex3f(-128.f, -128.f, -128.f);
gl.End();
// south
tex = FMaterial::ValidateTexture(sb->faces[2]);
tex->Bind(CM_Index, GLT_CLAMPX|GLT_CLAMPY, 0);
gl_RenderState.Apply();
gl.Begin(GL_TRIANGLE_FAN);
gl.TexCoord2f(0, 0);
gl.Vertex3f(-128.f, 128.f, 128.f);
gl.TexCoord2f(1, 0);
gl.Vertex3f(128.f, 128.f, 128.f);
gl.TexCoord2f(1, 1);
gl.Vertex3f(128.f, -128.f, 128.f);
gl.TexCoord2f(0, 1);
gl.Vertex3f(-128.f, -128.f, 128.f);
gl.End();
// west
tex = FMaterial::ValidateTexture(sb->faces[3]);
tex->Bind(CM_Index, GLT_CLAMPX|GLT_CLAMPY, 0);
gl_RenderState.Apply();
gl.Begin(GL_TRIANGLE_FAN);
gl.TexCoord2f(0, 0);
gl.Vertex3f(128.f, 128.f, 128.f);
gl.TexCoord2f(1, 0);
gl.Vertex3f(128.f, 128.f, -128.f);
gl.TexCoord2f(1, 1);
gl.Vertex3f(128.f, -128.f, -128.f);
gl.TexCoord2f(0, 1);
gl.Vertex3f(128.f, -128.f, 128.f);
gl.End();
}
else
{
faces=1;
// all 4 sides
tex = FMaterial::ValidateTexture(sb->faces[0]);
tex->Bind(CM_Index, GLT_CLAMPX|GLT_CLAMPY, 0);
gl_RenderState.Apply();
gl.Begin(GL_TRIANGLE_FAN);
gl.TexCoord2f(0, 0);
gl.Vertex3f(128.f, 128.f, -128.f);
gl.TexCoord2f(.25f, 0);
gl.Vertex3f(-128.f, 128.f, -128.f);
gl.TexCoord2f(.25f, 1);
gl.Vertex3f(-128.f, -128.f, -128.f);
gl.TexCoord2f(0, 1);
gl.Vertex3f(128.f, -128.f, -128.f);
gl.End();
// east
gl.Begin(GL_TRIANGLE_FAN);
gl.TexCoord2f(.25f, 0);
gl.Vertex3f(-128.f, 128.f, -128.f);
gl.TexCoord2f(.5f, 0);
gl.Vertex3f(-128.f, 128.f, 128.f);
gl.TexCoord2f(.5f, 1);
gl.Vertex3f(-128.f, -128.f, 128.f);
gl.TexCoord2f(.25f, 1);
gl.Vertex3f(-128.f, -128.f, -128.f);
gl.End();
// south
gl.Begin(GL_TRIANGLE_FAN);
gl.TexCoord2f(.5f, 0);
gl.Vertex3f(-128.f, 128.f, 128.f);
gl.TexCoord2f(.75f, 0);
gl.Vertex3f(128.f, 128.f, 128.f);
gl.TexCoord2f(.75f, 1);
gl.Vertex3f(128.f, -128.f, 128.f);
gl.TexCoord2f(.5f, 1);
gl.Vertex3f(-128.f, -128.f, 128.f);
gl.End();
// west
gl.Begin(GL_TRIANGLE_FAN);
gl.TexCoord2f(.75f, 0);
gl.Vertex3f(128.f, 128.f, 128.f);
gl.TexCoord2f(1, 0);
gl.Vertex3f(128.f, 128.f, -128.f);
gl.TexCoord2f(1, 1);
gl.Vertex3f(128.f, -128.f, -128.f);
gl.TexCoord2f(.75f, 1);
gl.Vertex3f(128.f, -128.f, 128.f);
gl.End();
}
// top
tex = FMaterial::ValidateTexture(sb->faces[faces]);
tex->Bind(CM_Index, GLT_CLAMPX|GLT_CLAMPY, 0);
gl_RenderState.Apply();
gl.Begin(GL_TRIANGLE_FAN);
if (!sb->fliptop)
{
gl.TexCoord2f(0, 0);
gl.Vertex3f(128.f, 128.f, -128.f);
gl.TexCoord2f(1, 0);
gl.Vertex3f(-128.f, 128.f, -128.f);
gl.TexCoord2f(1, 1);
gl.Vertex3f(-128.f, 128.f, 128.f);
gl.TexCoord2f(0, 1);
gl.Vertex3f(128.f, 128.f, 128.f);
}
else
{
gl.TexCoord2f(0, 0);
gl.Vertex3f(128.f, 128.f, 128.f);
gl.TexCoord2f(1, 0);
gl.Vertex3f(-128.f, 128.f, 128.f);
gl.TexCoord2f(1, 1);
gl.Vertex3f(-128.f, 128.f, -128.f);
gl.TexCoord2f(0, 1);
gl.Vertex3f(128.f, 128.f, -128.f);
}
gl.End();
// bottom
tex = FMaterial::ValidateTexture(sb->faces[faces+1]);
tex->Bind(CM_Index, GLT_CLAMPX|GLT_CLAMPY, 0);
gl_RenderState.Apply();
gl.Begin(GL_TRIANGLE_FAN);
gl.TexCoord2f(0, 0);
gl.Vertex3f(128.f, -128.f, -128.f);
gl.TexCoord2f(1, 0);
gl.Vertex3f(-128.f, -128.f, -128.f);
gl.TexCoord2f(1, 1);
gl.Vertex3f(-128.f, -128.f, 128.f);
gl.TexCoord2f(0, 1);
gl.Vertex3f(128.f, -128.f, 128.f);
gl.End();
}
//-----------------------------------------------------------------------------
//
//
//
//-----------------------------------------------------------------------------
void GLSkyPortal::DrawContents()
{
bool drawBoth = false;
int CM_Index;
PalEntry FadeColor(0,0,0,0);
// We have no use for Doom lighting special handling here, so disable it for this function.
int oldlightmode = glset.lightmode;
if (glset.lightmode == 8) glset.lightmode = 2;
if (gl_fixedcolormap)
{
CM_Index=gl_fixedcolormap<CM_FIRSTSPECIALCOLORMAP + SpecialColormaps.Size()? gl_fixedcolormap:CM_DEFAULT;
}
else
{
CM_Index=CM_DEFAULT;
FadeColor=origin->fadecolor;
}
gl_RenderState.EnableFog(false);
gl_RenderState.EnableAlphaTest(false);
gl_RenderState.BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
gl.MatrixMode(GL_MODELVIEW);
gl.PushMatrix();
GLRenderer->SetupView(0, 0, 0, viewangle, !!(MirrorFlag&1), !!(PlaneMirrorFlag&1));
if (origin->texture[0] && origin->texture[0]->tex->gl_info.bSkybox)
{
if (gl_fixedcolormap != CM_DEFAULT)
{
float rr,gg,bb;
gl_GetLightColor(255, 0, NULL, &rr, &gg, &bb);
R=rr;
G=gg;
B=bb;
}
else R=G=B=1.f;
RenderBox(origin->skytexno1, origin->texture[0], origin->x_offset[0], CM_Index, origin->sky2);
gl_RenderState.EnableAlphaTest(true);
}
else
{
if (origin->texture[0]==origin->texture[1] && origin->doublesky) origin->doublesky=false;
if (origin->texture[0])
{
gl_RenderState.SetTextureMode(TM_OPAQUE);
RenderDome(origin->skytexno1, origin->texture[0], origin->x_offset[0], origin->y_offset, origin->mirrored, CM_Index);
gl_RenderState.SetTextureMode(TM_MODULATE);
}
gl_RenderState.EnableAlphaTest(true);
gl_RenderState.AlphaFunc(GL_GEQUAL,0.05f);
if (origin->doublesky && origin->texture[1])
{
secondlayer=true;
RenderDome(FNullTextureID(), origin->texture[1], origin->x_offset[1], origin->y_offset, false, CM_Index);
secondlayer=false;
}
if (skyfog>0 && (FadeColor.r ||FadeColor.g || FadeColor.b))
{
gl_RenderState.EnableTexture(false);
foglayer=true;
gl.Color4f(FadeColor.r/255.0f,FadeColor.g/255.0f,FadeColor.b/255.0f,skyfog/255.0f);
RenderDome(FNullTextureID(), NULL, 0, 0, false, CM_DEFAULT);
gl_RenderState.EnableTexture(true);
foglayer=false;
}
}
gl.PopMatrix();
glset.lightmode = oldlightmode;
}
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