Hello!
i use simple Cg vertex shader.
[b]
struct PS {
float4 position : POSITION; // position in projection space
float2 uv0 : TEXCOORD0; // texture coordinate
};
uniform float4x4 ModelViewProjection : WorldViewProj; //register(c0); // the modelviewprojection matrix
PS vsMain(float4 position : POSITION, float2 uv0 : TEXCOORD0)
{
PS vsOut;
vsOut.position = mul(position, ModelViewProjection);
vsOut.uv0 = uv0;
return vsOut;
}
[/b]
After i get compiled code to arbvp1 profile:
[b]
!!ARBvp1.0
cgc version 1.5.0019, build date Feb 22 2007 06:27:05
command line args: -q -profile arbvp1 -entry vsMain -DWorldViewProj=state.matrix.mvp.transpose -DWORLDVIEWPROJ=state.matrix.mvp.transpose -Dworldviewproj=state.matrix.mvp.transpose -DProjection=state.matrix.projection -DPROJECTION=state.matrix.projection -Dprojection=state.matrix.projection -DView=state.matrix.modelview.transpose -DVIEW=state.matrix.modelview.transpose -Dview=state.matrix.modelview.transpose -DWorld=state.matrix.modelview.transpose -DWORLD=state.matrix.modelview.transpose -Dworld=state.matrix.modelview.transpose NumTemps=65535 MaxInstructions=256 MaxAddressRegs=1 MaxLocalParams=256
#vendor NVIDIA Corporation
#version 1.5.0.19
#profile arbvp1
#program vsMain
#semantic DiffSampler
#semantic ModelViewProjection : STATE.MATRIX.MVP.TRANSPOSE
#var float4 position : $vin.POSITION : POSITION : 0 : 1
#var float2 uv0 : $vin.TEXCOORD0 : TEXCOORD0 : 1 : 1
#var sampler DiffSampler : : : -1 : 0
#var float4x4 ModelViewProjection : STATE.MATRIX.MVP.TRANSPOSE : c[1], 4 : -1 : 1
#var float4 vsMain.position : $vout.POSITION : HPOS : -1 : 1
#var float2 vsMain.uv0 : $vout.TEXCOORD0 : TEX0 : -1 : 1
PARAM c[5] = { program.local[0],
state.matrix.mvp.transpose };
TEMP R0;
MUL R0, vertex.position.y, c[2];
MAD R0, vertex.position.x, c[1], R0;
MAD R0, vertex.position.z, c[3], R0;
MAD result.position, vertex.position.w, c[4], R0;
MOV result.texcoord[0].xy, vertex.texcoord[0];
END
5 instructions, 1 R-regs
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if use this, objects in scene is black 
if use simple pixel Cg shader:
float4 psMain(float2 uv0: TECOORD0) : COLOR
{
float4 diffColor = tex2D(DiffSampler, uv0);
return diffColor;
}
all ok! objects not black.
- I have found first decision:
if pixel shader does not exist, I cause:
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
this works if cards support GL_ARB_fragment_program(Radeon X1300, GeForce 6600 ).
On card Geforce2, Radeon 9200 SE objects on former black . - I have found second decision:
I return the colour from top in pixel shader:
[b]
struct PS {
float4 position : POSITION; // position in projection space
float2 uv0 : TEXCOORD0; // texture coordinate
float4 color : COLOR0;
};
uniform float4x4 ModelViewProjection : WorldViewProj; //register(c0); // the modelviewprojection matrix
PS vsMain(float4 position : POSITION, float2 uv0 : TEXCOORD0, float4 color : COLOR0)
{
PS vsOut;
vsOut.position = mul(position, ModelViewProjection);
vsOut.uv0 = uv0;
vsOut.color = color;
return vsOut;
}
[/b]
Exists decision of the problem without change top vertex shader?