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Rewrite the stencil buffer usage slightly, so both the LOS and layered polys work. LOS uses the top bit of the stencil buffer. Fixes some minor issues with draw order in sega rally.

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This commit is contained in:
Ian Curtis 2023-11-10 19:13:37 +00:00
parent f9a0901e8c
commit c40d6ac17b
2 changed files with 20 additions and 7 deletions
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5
Src/Graphics/New3D/New3D.cpp
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@ -330,8 +330,6 @@ void CNew3D::SetRenderStates()
glDisable (GL_CULL_FACE); // we'll emulate this in the shader
glEnable (GL_STENCIL_TEST);
glStencilOp (GL_KEEP, GL_KEEP, GL_REPLACE);
glStencilMask (0xFF);
glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glDisable (GL_BLEND);
@ -1876,6 +1874,9 @@ bool CNew3D::ProcessLos(int priority)
GLubyte stencilVal;
glReadPixels(losX, losY, 1, 1, GL_STENCIL_INDEX, GL_UNSIGNED_BYTE, &stencilVal);
// apply our mask to stencil, because layered poly attributes use the lower bits
stencilVal &= 0x80;
// if the stencil val is zero that means we've hit sky or whatever, if it hits a 1 we've hit geometry
// the real3d returns 1 in the top bit of the float if the line of sight test passes (ie doesn't hit geometry)

20
Src/Graphics/New3D/R3DShader.cpp
View file

@ -298,14 +298,26 @@ void R3DShader::SetMeshUniforms(const Mesh* m)
glUniform2iv(m_locTexWrapMode, 1, m_texWrapMode);
}
if (m_dirtyMesh || m->noLosReturn != m_noLosReturn) {
m_noLosReturn = m->noLosReturn;
glStencilFunc(GL_ALWAYS, m_noLosReturn << 7, 0b10000000);
glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
glStencilMask(0b10000000);
}
if (m_dirtyMesh || m->layered != m_layered) {
m_layered = m->layered;
// i think it should just disable z write, but the polys I think must be written first
if (m_layered) {
glStencilFunc(GL_EQUAL, 0, 0b01111111); // basically stencil test passes if the value is zero
glStencilOp(GL_KEEP, GL_INCR, GL_INCR); // if the stencil test passes, we increment the value
glStencilMask(0b01111111);
}
else {
glStencilFunc(GL_ALWAYS, m_noLosReturn << 7, 0b10000000);
glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
glStencilMask(0b10000000);
}
if (m_dirtyMesh || m->noLosReturn != m_noLosReturn) {
m_noLosReturn = m->noLosReturn;
glStencilFunc(GL_ALWAYS, m_noLosReturn, -1); // we'll write either a 0 or 1 to the stencil buffer
}
m_dirtyMesh = false;