For the while now, I've been working with DirectX and its FX format, but lately I decided to visit my OpenGL roots and take a stab at cgFX. So far, it's rather easy to understand and implement. My problem is that while everything seems to show up, it's not displaying entirely correct. In my demo, I render 3 quads to the screen, each with its own texture. Each quad, I also have colored either red, green, or blue. The first quad, colored red, is in the middle. The second quad, colored green, is on the right. And finally, the third quad, colored blue is on the left. This render correctly if I never call cgSetPassState(), but if I do call it, the rendering of the quads changes. What happens is that the quads' color and textures are misplaced. The geometry and positions are correct, but the colors and textures are placed on the quads from left to right (left = red quad, middle = green quad, right = blue quad).
Here is the source for my render call:
CGpass pass = cgGetFirstPass(m_pShader -> GetActiveTechnique());
while(pass)
{
cgSetPassState(pass);
glBindTexture(GL_TEXTURE_2D, 1);
glPushMatrix();
{
glTranslatef(0, 0, -3);
glRotatef(g_fRotation, 0, 0, 1);
glBegin(GL_TRIANGLE_STRIP);
{
glColor4f(1, 0, 0, 1); glTexCoord2f(0, 1); glVertex3f(-1, 1, 0);
glColor4f(1, 0, 0, 1); glTexCoord2f(1, 1); glVertex3f(1, 1, 0);
glColor4f(1, 0, 0, 1); glTexCoord2f(0, 0); glVertex3f(-1, -1, 0);
glColor4f(1, 0, 0, 1); glTexCoord2f(1, 0); glVertex3f(1, -1, 0);
}
glEnd();
}
cgGLSetStateMatrixParameter(cgGetEffectParameterBySemantic(m_cgEffect, "ModelViewProjection"), CG_GL_MODELVIEW_PROJECTION_MATRIX, CG_GL_MATRIX_IDENTITY);
glPopMatrix();
glPushMatrix();
{
glBindTexture(GL_TEXTURE_2D, 2);
glTranslatef(2, 0, sin(g_fRotation / 180 * (float) M_PI) - 3);
glRotatef(g_fRotation, 0, 0, 1);
glBegin(GL_TRIANGLE_STRIP);
{
glColor4f(0, 1, 0, 1); glTexCoord2f(0, 1); glVertex3f(-1, 1, 0);
glColor4f(0, 1, 0, 1); glTexCoord2f(1, 1); glVertex3f(1, 1, 0);
glColor4f(0, 1, 0, 1); glTexCoord2f(0, 0); glVertex3f(-1, -1, 0);
glColor4f(0, 1, 0, 1); glTexCoord2f(1, 0); glVertex3f(1, -1, 0);
}
glEnd();
}
cgGLSetStateMatrixParameter(cgGetEffectParameterBySemantic(m_cgEffect, "ModelViewProjection"), CG_GL_MODELVIEW_PROJECTION_MATRIX, CG_GL_MATRIX_IDENTITY);
glPopMatrix();
glPushMatrix();
{
glBindTexture(GL_TEXTURE_2D, 3);
glTranslatef(-2, 0, cos(g_fRotation / 180 * (float) M_PI) - 3);
glRotatef(g_fRotation, 0, 0, 1);
glBegin(GL_TRIANGLE_STRIP);
{
glColor4f(0, 0, 1, 1); glTexCoord2f(0, 1); glVertex3f(-1, 1, 0);
glColor4f(0, 0, 1, 1); glTexCoord2f(1, 1); glVertex3f(1, 1, 0);
glColor4f(0, 0, 1, 1); glTexCoord2f(0, 0); glVertex3f(-1, -1, 0);
glColor4f(0, 0, 1, 1); glTexCoord2f(1, 0); glVertex3f(1, -1, 0);
}
glEnd();
}
cgGLSetStateMatrixParameter(cgGetEffectParameterBySemantic(m_cgEffect, "ModelViewProjection"), CG_GL_MODELVIEW_PROJECTION_MATRIX, CG_GL_MATRIX_IDENTITY);
glPopMatrix();
cgResetPassState(pass);
pass = cgGetNextPass(pass);
}
And here is my cgFX file:
float4x4 ModelViewProj : ModelViewProjection;
sampler2D TexMap : register(s0);
struct VS_Input
{
float3 Position : POSITION;
float4 Color : COLOR;
float2 TexCoord : TEXCOORD;
};
struct VS_Output
{
float4 Position : POSITION;
float4 Color : COLOR;
float2 TexCoord : TEXCOORD;
};
VS_Output vs_default(VS_Input In)
{
VS_Output Out;
Out.Position = mul(ModelViewProj, float4(In.Position, 1.0));
Out.Color = In.Color;
Out.TexCoord = In.TexCoord;
return Out;
}
float4 ps_default(VS_Output In) : COLOR
{
return tex2D(TexMap, In.TexCoord) * In.Color;
}
technique technique_default
{
pass
{
VertexProgram = compile arbvp1 vs_default();
FragmentProgram = compile arbfp1 ps_default();
}
}
Any incite would be appreciated. Also, if necessary, I can provide screenshots.
[Edited by - iykxcy on August 2, 2007 12:57:54 PM]
