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gzdoom-gles/src/gl/compatibility/gl_20.cpp
Christoph Oelckers 26acf8e994 - fixed conditions for menu patching.
2016-05-01 17:43:30 +02:00

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/*
** gl_20.cpp
**
** Fallback code for ancient hardware
** This file collects everything larger that is only needed for
** OpenGL 2.0/no shader compatibility.
**
**---------------------------------------------------------------------------
** Copyright 2005-2016 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 "menu/menu.h"
#include "tarray.h"
#include "doomtype.h"
#include "m_argv.h"
#include "zstring.h"
#include "version.h"
#include "i_system.h"
#include "v_text.h"
#include "r_utility.h"
#include "gl/dynlights/gl_dynlight.h"
#include "gl/utility/gl_geometric.h"
#include "gl/renderer/gl_renderer.h"
#include "gl/system/gl_interface.h"
#include "gl/system/gl_cvars.h"
#include "gl/renderer/gl_renderstate.h"
#include "gl/scene/gl_drawinfo.h"
//==========================================================================
//
// Do some tinkering with the menus so that certain options only appear
// when they are actually valid.
//
//==========================================================================
void gl_PatchMenu()
{
if (gl.glslversion == 0)
{
// Radial fog and Doom lighting are not available in SM < 4 cards
// The way they are implemented does not work well on older hardware.
FOptionValues **opt = OptionValues.CheckKey("LightingModes");
if (opt != NULL)
{
for(int i = (*opt)->mValues.Size()-1; i>=0; i--)
{
// Delete 'Doom' lighting mode
if ((*opt)->mValues[i].Value == 2.0 || (*opt)->mValues[i].Value == 8.0)
{
(*opt)->mValues.Delete(i);
}
}
}
opt = OptionValues.CheckKey("FogMode");
if (opt != NULL)
{
for(int i = (*opt)->mValues.Size()-1; i>=0; i--)
{
// Delete 'Radial' fog mode
if ((*opt)->mValues[i].Value == 2.0)
{
(*opt)->mValues.Delete(i);
}
}
}
// disable features that don't work without shaders.
if (gl_lightmode == 2 || gl_lightmode == 8) gl_lightmode = 3;
if (gl_fogmode == 2) gl_fogmode = 1;
}
}
//==========================================================================
//
//
//
//==========================================================================
void gl_SetTextureMode(int type)
{
static float white[] = {1.f,1.f,1.f,1.f};
if (type == TM_MASK)
{
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB, GL_REPLACE);
glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB, GL_PRIMARY_COLOR);
glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB, GL_SRC_COLOR);
glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA, GL_MODULATE);
glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA, GL_PRIMARY_COLOR);
glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA, GL_TEXTURE0);
glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA, GL_SRC_ALPHA);
glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA, GL_SRC_ALPHA);
}
else if (type == TM_OPAQUE)
{
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB, GL_MODULATE);
glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB, GL_TEXTURE0);
glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB, GL_PRIMARY_COLOR);
glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB, GL_SRC_COLOR);
glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB, GL_SRC_COLOR);
glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA, GL_REPLACE);
glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA, GL_PRIMARY_COLOR);
glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA, GL_SRC_ALPHA);
}
else if (type == TM_INVERSE)
{
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB, GL_MODULATE);
glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB, GL_TEXTURE0);
glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB, GL_PRIMARY_COLOR);
glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB, GL_ONE_MINUS_SRC_COLOR);
glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB, GL_SRC_COLOR);
glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA, GL_MODULATE);
glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA, GL_PRIMARY_COLOR);
glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA, GL_TEXTURE0);
glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA, GL_SRC_ALPHA);
glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA, GL_SRC_ALPHA);
}
else if (type == TM_INVERTOPAQUE)
{
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB, GL_MODULATE);
glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB, GL_TEXTURE0);
glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB, GL_PRIMARY_COLOR);
glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB, GL_ONE_MINUS_SRC_COLOR);
glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB, GL_SRC_COLOR);
glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA, GL_REPLACE);
glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA, GL_PRIMARY_COLOR);
glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA, GL_SRC_ALPHA);
}
else // if (type == TM_MODULATE)
{
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
}
}
//==========================================================================
//
//
//
//==========================================================================
static int ffTextureMode;
static bool ffTextureEnabled;
static bool ffFogEnabled;
static PalEntry ffFogColor;
static int ffSpecialEffect;
static float ffFogDensity;
static bool currentTextureMatrixState;
static bool currentModelMatrixState;
void FRenderState::ApplyFixedFunction()
{
if (mTextureMode != ffTextureMode)
{
ffTextureMode = mTextureMode;
if (ffTextureMode == TM_CLAMPY) ffTextureMode = TM_MODULATE; // this cannot be replicated. Too bad if it creates visual artifacts
gl_SetTextureMode(ffTextureMode);
}
if (mTextureEnabled != ffTextureEnabled)
{
if ((ffTextureEnabled = mTextureEnabled)) glEnable(GL_TEXTURE_2D);
else glDisable(GL_TEXTURE_2D);
}
if (mFogEnabled != ffFogEnabled)
{
if ((ffFogEnabled = mFogEnabled))
{
glEnable(GL_FOG);
}
else glDisable(GL_FOG);
}
if (mFogEnabled)
{
if (ffFogColor != mFogColor)
{
ffFogColor = mFogColor;
GLfloat FogColor[4] = { mFogColor.r / 255.0f,mFogColor.g / 255.0f,mFogColor.b / 255.0f,0.0f };
glFogfv(GL_FOG_COLOR, FogColor);
}
if (ffFogDensity != mLightParms[2])
{
glFogf(GL_FOG_DENSITY, mLightParms[2] * -0.6931471f); // = 1/log(2)
ffFogDensity = mLightParms[2];
}
}
if (mSpecialEffect != ffSpecialEffect)
{
switch (ffSpecialEffect)
{
case EFF_SPHEREMAP:
glDisable(GL_TEXTURE_GEN_T);
glDisable(GL_TEXTURE_GEN_S);
default:
break;
}
switch (mSpecialEffect)
{
case EFF_SPHEREMAP:
// Use sphere mapping for this
glEnable(GL_TEXTURE_GEN_T);
glEnable(GL_TEXTURE_GEN_S);
glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
break;
default:
break;
}
ffSpecialEffect = mSpecialEffect;
}
FStateVec4 col = mColor;
col.vec[0] += mDynColor.vec[0];
col.vec[1] += mDynColor.vec[1];
col.vec[2] += mDynColor.vec[2];
col.vec[0] = clamp(col.vec[0], 0.f, 1.f);
col.vec[0] = clamp(col.vec[0], 0.f, 1.f);
col.vec[1] = clamp(col.vec[1], 0.f, 1.f);
col.vec[2] = clamp(col.vec[2], 0.f, 1.f);
col.vec[3] = clamp(col.vec[3], 0.f, 1.f);
col.vec[0] *= (mObjectColor.r / 255.f);
col.vec[1] *= (mObjectColor.g / 255.f);
col.vec[2] *= (mObjectColor.b / 255.f);
col.vec[3] *= (mObjectColor.a / 255.f);
glColor4fv(col.vec);
glEnable(GL_BLEND);
if (mAlphaThreshold > 0)
{
glEnable(GL_ALPHA_TEST);
glAlphaFunc(GL_GREATER, mAlphaThreshold * col.vec[3]);
}
else
{
glDisable(GL_ALPHA_TEST);
}
if (mTextureMatrixEnabled)
{
glMatrixMode(GL_TEXTURE);
glLoadMatrixf(mTextureMatrix.get());
currentTextureMatrixState = true;
}
else if (currentTextureMatrixState)
{
glMatrixMode(GL_TEXTURE);
glLoadIdentity();
currentTextureMatrixState = false;
}
if (mModelMatrixEnabled)
{
VSMatrix mult = mViewMatrix;
mult.multMatrix(mModelMatrix);
glMatrixMode(GL_MODELVIEW);
glLoadMatrixf(mult.get());
currentModelMatrixState = true;
}
else if (currentModelMatrixState)
{
glMatrixMode(GL_MODELVIEW);
glLoadMatrixf(mViewMatrix.get());
currentModelMatrixState = false;
}
}
//==========================================================================
//
//
//
//==========================================================================
void gl_FillScreen();
void FRenderState::DrawColormapOverlay()
{
float r, g, b;
if (mColormapState > CM_DEFAULT && mColormapState < CM_MAXCOLORMAP)
{
FSpecialColormap *scm = &SpecialColormaps[gl_fixedcolormap - CM_FIRSTSPECIALCOLORMAP];
float m[] = { scm->ColorizeEnd[0] - scm->ColorizeStart[0],
scm->ColorizeEnd[1] - scm->ColorizeStart[1], scm->ColorizeEnd[2] - scm->ColorizeStart[2], 0.f };
if (m[0] < 0 && m[1] < 0 && m[2] < 0)
{
gl_RenderState.SetColor(1, 1, 1, 1);
gl_RenderState.BlendFunc(GL_ONE_MINUS_DST_COLOR, GL_ZERO);
gl_FillScreen();
r = scm->ColorizeStart[0];
g = scm->ColorizeStart[1];
b = scm->ColorizeStart[2];
}
else
{
r = scm->ColorizeEnd[0];
g = scm->ColorizeEnd[1];
b = scm->ColorizeEnd[2];
}
}
else if (mColormapState == CM_LITE)
{
if (gl_enhanced_nightvision)
{
r = 0.375f, g = 1.0f, b = 0.375f;
}
else
{
return;
}
}
else if (mColormapState >= CM_TORCH)
{
int flicker = mColormapState - CM_TORCH;
r = (0.8f + (7 - flicker) / 70.0f);
if (r > 1.0f) r = 1.0f;
b = g = r;
if (gl_enhanced_nightvision) b = g * 0.75f;
}
else return;
gl_RenderState.SetColor(r, g, b, 1.f);
gl_RenderState.BlendFunc(GL_DST_COLOR, GL_ZERO);
gl_FillScreen();
gl_RenderState.BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}
//==========================================================================
//
// Sets up the parameters to render one dynamic light onto one plane
//
//==========================================================================
bool gl_SetupLight(int group, Plane & p, ADynamicLight * light, Vector & nearPt, Vector & up, Vector & right,
float & scale, int desaturation, bool checkside, bool forceadditive)
{
Vector fn, pos;
DVector3 lpos = light->PosRelative(group);
float dist = fabsf(p.DistToPoint(lpos.X, lpos.Z, lpos.Y));
float radius = (light->GetRadius() * gl_lights_size);
if (radius <= 0.f) return false;
if (dist > radius) return false;
if (checkside && gl_lights_checkside && p.PointOnSide(lpos.X, lpos.Z, lpos.Y))
{
return false;
}
if (light->owned && light->target != NULL && !light->target->IsVisibleToPlayer())
{
return false;
}
scale = 1.0f / ((2.f * radius) - dist);
// project light position onto plane (find closest point on plane)
pos.Set(lpos.X, lpos.Z, lpos.Y);
fn = p.Normal();
fn.GetRightUp(right, up);
#ifdef _MSC_VER
nearPt = pos + fn * dist;
#else
Vector tmpVec = fn * dist;
nearPt = pos + tmpVec;
#endif
float cs = 1.0f - (dist / radius);
if (gl_lights_additive || light->flags4&MF4_ADDITIVE || forceadditive) cs *= 0.2f; // otherwise the light gets too strong.
float r = light->GetRed() / 255.0f * cs * gl_lights_intensity;
float g = light->GetGreen() / 255.0f * cs * gl_lights_intensity;
float b = light->GetBlue() / 255.0f * cs * gl_lights_intensity;
if (light->IsSubtractive())
{
Vector v;
gl_RenderState.BlendEquation(GL_FUNC_REVERSE_SUBTRACT);
v.Set(r, g, b);
r = v.Length() - r;
g = v.Length() - g;
b = v.Length() - b;
}
else
{
gl_RenderState.BlendEquation(GL_FUNC_ADD);
}
if (desaturation > 0 && gl.glslversion > 0) // no-shader excluded because no desaturated textures.
{
float gray = (r * 77 + g * 143 + b * 37) / 257;
r = (r*(32 - desaturation) + gray*desaturation) / 32;
g = (g*(32 - desaturation) + gray*desaturation) / 32;
b = (b*(32 - desaturation) + gray*desaturation) / 32;
}
glColor3f(r, g, b);
return true;
}
//==========================================================================
//
//
//
//==========================================================================
bool gl_SetupLightTexture()
{
if (GLRenderer->gllight == NULL) return false;
FMaterial * pat = FMaterial::ValidateTexture(GLRenderer->gllight, false);
pat->Bind(CLAMP_XY, 0);
return true;
}
//==========================================================================
//
//
//
//==========================================================================
void FGLRenderer::RenderMultipassStuff()
{
return;
// First pass: empty background with sector light only
// Part 1: solid geometry. This is set up so that there are no transparent parts
// remove any remaining texture bindings and shaders whick may get in the way.
gl_RenderState.EnableTexture(false);
gl_RenderState.EnableBrightmap(false);
gl_RenderState.Apply();
gl_drawinfo->dldrawlists[GLLDL_WALLS_PLAIN].DrawWalls(GLPASS_BASE);
gl_drawinfo->dldrawlists[GLLDL_FLATS_PLAIN].DrawFlats(GLPASS_BASE);
// Part 2: masked geometry. This is set up so that only pixels with alpha>0.5 will show
// This creates a blank surface that only fills the nontransparent parts of the texture
gl_RenderState.EnableTexture(true);
gl_RenderState.SetTextureMode(TM_MASK);
gl_RenderState.EnableBrightmap(true);
gl_drawinfo->dldrawlists[GLLDL_WALLS_BRIGHT].DrawWalls(GLPASS_BASE_MASKED);
gl_drawinfo->dldrawlists[GLLDL_WALLS_MASKED].DrawWalls(GLPASS_BASE_MASKED);
gl_drawinfo->dldrawlists[GLLDL_FLATS_BRIGHT].DrawFlats(GLPASS_BASE_MASKED);
gl_drawinfo->dldrawlists[GLLDL_FLATS_MASKED].DrawFlats(GLPASS_BASE_MASKED);
// Part 3: The base of fogged surfaces, including the texture
gl_RenderState.EnableBrightmap(false);
gl_RenderState.SetTextureMode(TM_MODULATE);
gl_drawinfo->dldrawlists[GLLDL_WALLS_FOG].DrawWalls(GLPASS_PLAIN);
gl_drawinfo->dldrawlists[GLLDL_WALLS_FOGMASKED].DrawWalls(GLPASS_PLAIN);
gl_drawinfo->dldrawlists[GLLDL_FLATS_FOG].DrawFlats(GLPASS_PLAIN);
gl_drawinfo->dldrawlists[GLLDL_FLATS_FOGMASKED].DrawFlats(GLPASS_PLAIN);
// second pass: draw lights
glDepthMask(false);
if (mLightCount && !gl_fixedcolormap)
{
if (gl_SetupLightTexture())
{
gl_RenderState.BlendFunc(GL_ONE, GL_ONE);
glDepthFunc(GL_EQUAL);
if (glset.lightmode == 8) gl_RenderState.SetSoftLightLevel(255);
gl_drawinfo->dldrawlists[GLLDL_WALLS_PLAIN].DrawWalls(GLPASS_LIGHTTEX);
gl_drawinfo->dldrawlists[GLLDL_WALLS_BRIGHT].DrawWalls(GLPASS_LIGHTTEX);
gl_drawinfo->dldrawlists[GLLDL_WALLS_MASKED].DrawWalls(GLPASS_LIGHTTEX);
gl_drawinfo->dldrawlists[GLLDL_FLATS_PLAIN].DrawFlats(GLPASS_LIGHTTEX);
gl_drawinfo->dldrawlists[GLLDL_FLATS_BRIGHT].DrawFlats(GLPASS_LIGHTTEX);
gl_drawinfo->dldrawlists[GLLDL_FLATS_MASKED].DrawFlats(GLPASS_LIGHTTEX);
gl_RenderState.BlendEquation(GL_FUNC_ADD);
}
else gl_lights = false;
}
// third pass: modulated texture
gl_RenderState.SetColor(0xffffffff);
gl_RenderState.BlendFunc(GL_DST_COLOR, GL_ZERO);
gl_RenderState.EnableFog(false);
gl_RenderState.AlphaFunc(GL_GEQUAL, 0);
glDepthFunc(GL_LEQUAL);
gl_drawinfo->dldrawlists[GLLDL_WALLS_PLAIN].DrawWalls(GLPASS_TEXONLY);
gl_drawinfo->dldrawlists[GLLDL_FLATS_PLAIN].DrawFlats(GLPASS_TEXONLY);
gl_drawinfo->dldrawlists[GLLDL_WALLS_BRIGHT].DrawWalls(GLPASS_TEXONLY);
gl_drawinfo->dldrawlists[GLLDL_FLATS_BRIGHT].DrawFlats(GLPASS_TEXONLY);
gl_RenderState.AlphaFunc(GL_GREATER, gl_mask_threshold);
gl_drawinfo->dldrawlists[GLLDL_WALLS_MASKED].DrawWalls(GLPASS_TEXONLY);
gl_drawinfo->dldrawlists[GLLDL_FLATS_MASKED].DrawFlats(GLPASS_TEXONLY);
// fourth pass: additive lights
gl_RenderState.EnableFog(true);
gl_RenderState.BlendFunc(GL_ONE, GL_ONE);
glDepthFunc(GL_EQUAL);
if (gl_SetupLightTexture())
{
gl_drawinfo->dldrawlists[GLLDL_WALLS_PLAIN].DrawWalls(GLPASS_LIGHTTEX_ADDITIVE);
gl_drawinfo->dldrawlists[GLLDL_WALLS_BRIGHT].DrawWalls(GLPASS_LIGHTTEX_ADDITIVE);
gl_drawinfo->dldrawlists[GLLDL_WALLS_MASKED].DrawWalls(GLPASS_LIGHTTEX_ADDITIVE);
gl_drawinfo->dldrawlists[GLLDL_FLATS_PLAIN].DrawFlats(GLPASS_LIGHTTEX_ADDITIVE);
gl_drawinfo->dldrawlists[GLLDL_FLATS_BRIGHT].DrawFlats(GLPASS_LIGHTTEX_ADDITIVE);
gl_drawinfo->dldrawlists[GLLDL_FLATS_MASKED].DrawFlats(GLPASS_LIGHTTEX_ADDITIVE);
gl_drawinfo->dldrawlists[GLLDL_WALLS_FOG].DrawWalls(GLPASS_LIGHTTEX_ADDITIVE);
gl_drawinfo->dldrawlists[GLLDL_WALLS_FOGMASKED].DrawWalls(GLPASS_LIGHTTEX_ADDITIVE);
gl_drawinfo->dldrawlists[GLLDL_FLATS_FOG].DrawFlats(GLPASS_LIGHTTEX_ADDITIVE);
gl_drawinfo->dldrawlists[GLLDL_FLATS_FOGMASKED].DrawFlats(GLPASS_LIGHTTEX_ADDITIVE);
}
else gl_lights = false;
}
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