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Cubemaps losing mipmaps
#473516
07/17/18 22:42
07/17/18 22:42
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Joined: Oct 2007
Posts: 5,210
İstanbul, Turkey
Quad
OP
Senior Expert
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OP
Senior Expert
Joined: Oct 2007
Posts: 5,210
İstanbul, Turkey
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Hello, (test project at the bottom of the post) I am trying to write a shader with some environment mapping, but i can't seem to access mipmaps of skycube in the shader. I simplified it to this: This is basically envBump shader from the built-in shader library with minimal modifications(listed below the shader):
#include <transform>
#include <fog>
#include <pos>
#include <normal>
#include <light>
#include <vecskill>
#include <color>
float vecSunColor;
float fAlbedo;
texture entSkin1; // texture
texture entSkin2; // normal map
texture mtlSkin1;
sampler sBaseTex = sampler_state { Texture = <entSkin1>; MipFilter = Linear; };
sampler sBump = sampler_state { Texture = <entSkin2>; MipFilter = None; };
sampler sEnviro = sampler_state { Texture = <mtlSkin1>; MipFilter = Linear; MagFilter = Linear; MinFilter = Linear; };
struct bumpOut
{
float4 Pos: POSITION;
float Fog: FOG;
float4 Ambient: COLOR0;
float2 Tex: TEXCOORD0;
float3 PosWorld: TEXCOORD1;
float3 Vecskill: TEXCOORD2;
float3 Normal: TEXCOORD3;
};
bumpOut perPixel_VS(
in float4 inPos: POSITION,
in float3 inNormal: NORMAL,
in float2 inTex: TEXCOORD0,
in float3 inTangent: TEXCOORD2)
{
bumpOut Out;
Out.Pos = DoTransform(inPos);
Out.Tex = inTex;
Out.Fog = DoFog(inPos);
Out.Ambient = DoAmbient();
float facBump = DoDefault(vecSkill41.x*0.01,50*0.01);
float facTex = DoDefault(vecSkill41.y*0.01,50*0.01);
Out.Vecskill.x = facBump;
Out.Vecskill.y = facTex;
Out.Vecskill.z = vecSkill41.z;
Out.PosWorld = DoPos(inNormal);
Out.Normal = DoNormal(inNormal);
return Out;
}
float4 diffuseBump_PS(bumpOut In): COLOR
{
float4 base = tex2D(sBaseTex,In.Tex);
float3 bumpNormal = tex2D(sBump,In.Tex)*2-1;
float facBump = In.Vecskill.x;
float3 cubeTexCoord = normalize(reflect(In.PosWorld - vecViewPos,In.Normal));
cubeTexCoord = cubeTexCoord + (bumpNormal - cubeTexCoord )*facBump;
float4 newCubeTexCoord = float4(cubeTexCoord.x,cubeTexCoord.y,cubeTexCoord.z,In.Vecskill.z);
float4 environment = texCUBElod(sEnviro,newCubeTexCoord)*(vecColor+vecSunColor*vecDiffuse)*base.w;
float facTex = In.Vecskill.y;
float4 resultingBase = lerp(environment,base,facTex);
return resultingBase * (0.5+In.Ambient);
}
technique bump
{
pass One
{
VertexShader = compile vs_3_0 perPixel_VS();
PixelShader = compile ps_3_0 diffuseBump_PS();
}
}
technique fallback { pass one { } }
Changes: - Added skill43 (vecSkill41.z) as miplevel
- Changed texCUBE to texCUBElod and since texCUBElod expects mip level on w component of texCoord i added skill43 as w of newCubeTexCoord.
- bumped versions up to 3_0 because texCUBElod
This is the lite-c code to test the material:
#include <acknex.h>
#include <default.c>
#include <mtlfx.c>
#define PRAGMA_POINTER
BMAP* bmap_skycube = "desertsky+6.tga";
MATERIAL* matTEST = {
effect = "skymap.fx";
}
function materialInit()
{
bmap_skycube = bmap_to_mipmap(bmap_skycube);
bmap_to_cubemap(bmap_skycube); // <------ THIS LINE !!!!!
matTEST->skin1 = bmap_skycube;
}
void main(){
var facbump = 1;
var factext = 1;
var mipLevel = 1;
d3d_anisotropy = 7;
d3d_mipmapping = 4;
mip_levels = 10;
level_load("");
materialInit();
ENTITY* box = ent_create("cube.mdl",nullvector,NULL);
box->material = matTEST;
box->skill41 = floatv(facbump);
box->skill42 = floatv(factext);
box->skill43 = floatv(mipLevel);
camera->x = -31;
camera->z = 20;
camera->y = -4;
camera->pan = 16;
camera->tilt = -32;
video_set(800,600,0,0);
while(!key_esc){
DEBUG_VAR(mipLevel,50);
if(key_5 || key_6){
mipLevel += (key_5 - key_6)*time_step/6;
box->skill43 = floatv(mipLevel);
}
wait(1);
}
}
It creates a cube, applies the material, keys 5 and 6 modifies the mip level. Expected result is that when i press 5 i get a more blurry environment map. Actual result is that it does not change a thing which leds me to believe that the cubemap loses mipmaps when bmap_to_cubemap is called.  When i remove this line
bmap_to_cubemap(bmap_skycube);
from materialInit() function, i get the expected result:  (except it's not a cubemap anymore and everything is garbled) Test project: Link (try commenting line 17 in cubemiptest.c)
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Re: Cubemaps losing mipmaps
[Re: jcl]
#473525
07/19/18 10:37
07/19/18 10:37
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Joined: Oct 2007
Posts: 5,210
İstanbul, Turkey
Quad
OP
Senior Expert
|
OP
Senior Expert
Joined: Oct 2007
Posts: 5,210
İstanbul, Turkey
|
For mipmapped environment maps, create the mipmaps before calling bmap_to_cubemap (like bmap_to_cubemap(bmap_to_mipmap(skymap)). Creating mipmaps afterwards will produce an invalid environment map. expliciptly states, that one should create mipmaps before cubemaps and that doing so after creating cubemaps produces an invalid cubemap. Which it does, if i do
bmap_to_mipmap(bmap_to_cubemap(skymap))
i get a black cubemap.
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