From b03109dbb087bd441c0e3905753f3dd97d44d7b8 Mon Sep 17 00:00:00 2001
From: quou <quou@disroot.org>
Date: Thu, 2 Jan 2025 15:42:05 +1100
Subject: Simpler depth prepass shader

---
 video.cpp | 49 ++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 48 insertions(+), 1 deletion(-)

(limited to 'video.cpp')

diff --git a/video.cpp b/video.cpp
index b8b3f51..06bfc30 100644
--- a/video.cpp
+++ b/video.cpp
@@ -828,6 +828,9 @@ struct Vertex_Format_Vk {
 	void init(Device_Vk* dev, const Vertex_Format_Desc& desc);
 	void destroy(Device_Vk* dev);
 	static VkFormat format_from_svar_type(SVariable_Type type);
+
+	void clone(Arena* arena);
+	void optimise(const Vertex_Format_Vk* shadervf);
 };
 
 struct Sampler_Vk : public Late_Terminated {
@@ -2608,13 +2611,19 @@ void Pipeline_Vk::init_vertex_input(
 	VkGraphicsPipelineCreateInfo& info,
 	const Pipeline& desc
 ) {
-	Vertex_Format_Vk& vf = dev->vertex_formats[desc.vertex_format];
+	Vertex_Format_Vk vf = dev->vertex_formats[desc.vertex_format];
 	VkPipelineVertexInputStateCreateInfo& vi = 
 		*(VkPipelineVertexInputStateCreateInfo*)arena_alloc(
 			&scope,
 			sizeof vi
 		);
 	zero(&vi, sizeof vi);
+	auto& shader = dev->get_shader(desc.shader);
+	if (shader.vf != desc.vertex_format) {
+		auto shader_vf = (Vertex_Format_Vk*)&dev->vertex_formats[shader.vf];
+		vf.clone(&scope);
+		vf.optimise(shader_vf);
+	}
 	vi.sType = VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_STATE_CREATE_INFO;
 	vi.vertexBindingDescriptionCount = vf.binding_count;
 	vi.pVertexBindingDescriptions = vf.bindings;
@@ -3107,6 +3116,44 @@ void Vertex_Format_Vk::destroy(Device_Vk* dev) {
 	heap_free(dev->heap, bindings);
 }
 
+void Vertex_Format_Vk::clone(Arena* arena) {
+	int bc = binding_count * sizeof *bindings;
+	int ac = attr_count * sizeof *attrs;
+	auto nb = (VkVertexInputBindingDescription*)arena_alloc(
+		arena,
+		bc
+	);
+	auto na = (VkVertexInputAttributeDescription*)arena_alloc(
+		arena,
+		ac
+	);
+	memcpy(nb, bindings, bc);
+	memcpy(na, attrs, ac);
+	bindings = nb;
+	attrs = na;
+}
+
+void Vertex_Format_Vk::optimise(const Vertex_Format_Vk* shadervf) {
+	int i;
+	if (shadervf->attr_count >= attr_count) return;
+	for (i = attr_count - 1; i >= 0; i--) {
+		auto& a = attrs[i];
+		int j, idx = -1;
+		for (j = 0; j < shadervf->attr_count; j++) {
+			auto& b = shadervf->attrs[j];
+			if (b.binding == a.binding && b.location == a.location) {
+				idx = j;
+				break;
+			}
+		}
+		if (idx == -1) {
+			int last = attr_count - 1;
+			attrs[i] = attrs[last];
+			attr_count = last;
+		}
+	}
+}
+
 bool Shader_Vk::init_module(
 	Device_Vk* dev,
 	int stage,
-- 
cgit v1.2.3-54-g00ecf