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fix(rendering): enable backface culling for one-sided M2 materials (#57)

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All M2 pipelines used VK_CULL_MODE_NONE, so back-facing polygons always
rendered.  On NPCs whose torso meshes are single-layer geometry this
made the interior cavity visible through the back.

Create backface-culled pipeline variants (VK_CULL_MODE_BACK_BIT) and
select them at draw time unless the material has the TwoSided flag
(0x04).  Foliage/ground-detail forceCutout batches and the shadow
pipeline keep VK_CULL_MODE_NONE since those cards are inherently
two-sided.
This commit is contained in:
Kelsi 2026-04-06 18:18:05 -07:00
parent f79110cb14
commit 7b746a3045
3 changed files with 48 additions and 10 deletions
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25
src/rendering/m2_renderer_render.cpp
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@ -1147,16 +1147,25 @@ void M2Renderer::render(VkCommandBuffer cmd, VkDescriptorSet perFrameSet, const
}
if (forceCutout) effectiveBlendMode = 1;
const bool twoSided = (batch.materialFlags & 0x04) != 0;
VkPipeline desiredPipeline;
if (forceCutout) {
// Foliage / ground-detail cards are effectively two-sided
desiredPipeline = opaquePipeline_;
} else {
} else if (twoSided) {
switch (effectiveBlendMode) {
case 0: desiredPipeline = opaquePipeline_; break;
case 1: desiredPipeline = alphaTestPipeline_; break;
case 2: desiredPipeline = alphaPipeline_; break;
default: desiredPipeline = additivePipeline_; break;
}
} else {
switch (effectiveBlendMode) {
case 0: desiredPipeline = opaqueCulledPipeline_; break;
case 1: desiredPipeline = alphaTestCulledPipeline_; break;
case 2: desiredPipeline = alphaCulledPipeline_; break;
default: desiredPipeline = additiveCulledPipeline_; break;
}
}
if (desiredPipeline != currentPipeline) {
vkCmdBindPipeline(cmd, VK_PIPELINE_BIND_POINT_GRAPHICS, desiredPipeline);
@ -1348,10 +1357,18 @@ void M2Renderer::render(VkCommandBuffer cmd, VkDescriptorSet perFrameSet, const
else if (effectiveBlendMode == 4 || effectiveBlendMode == 5) effectiveBlendMode = 3;
}
const bool twoSided = (batch.materialFlags & 0x04) != 0;
VkPipeline desiredPipeline;
switch (effectiveBlendMode) {
case 2: desiredPipeline = alphaPipeline_; break;
default: desiredPipeline = additivePipeline_; break;
if (twoSided) {
switch (effectiveBlendMode) {
case 2: desiredPipeline = alphaPipeline_; break;
default: desiredPipeline = additivePipeline_; break;
}
} else {
switch (effectiveBlendMode) {
case 2: desiredPipeline = alphaCulledPipeline_; break;
default: desiredPipeline = additiveCulledPipeline_; break;
}
}
if (desiredPipeline != currentPipeline) {
vkCmdBindPipeline(cmd, VK_PIPELINE_BIND_POINT_GRAPHICS, desiredPipeline);