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gpu: implement polygon offset

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Co-authored-by: Pouare514 <julienaulycee@gmail.com>
This commit is contained in:
nmzik
2026-08-06 22:02:19 +02:00
parent 3052dac82e
commit e9f5da27f8
9 changed files with 169 additions and 49 deletions
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src/graphics/host_gpu/renderer/renderDraw.cpp
+47 -4
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@@ -64,12 +64,32 @@ int32_t ResolveVertexOffset(uint32_t index_offset, const ShaderVertexInputInfo&
return 0;
}
static std::atomic<uint32_t> g_draw_state_log_count = 0;
static std::atomic<uint32_t> g_draw_input_log_count = 0;
static std::atomic<uint32_t> g_mrt_state_log_count = 0;
static std::atomic<uint32_t> g_shader_stage_log_count = 0;
static std::atomic<uint32_t> g_draw_state_log_count = 0;
static std::atomic<uint32_t> g_draw_input_log_count = 0;
static std::atomic<uint32_t> g_mrt_state_log_count = 0;
static std::atomic<uint32_t> g_shader_stage_log_count = 0;
static std::atomic<uint32_t> g_framebuffer_skip_log_count = 0;
static float ConvertPolygonOffsetConstantFactor(float guest_factor, const HW::PolyOffset& offset,
vk::Format host_depth_format) {
if (offset.db_is_float_fmt) {
return guest_factor;
}
int host_depth_bits = 0;
switch (host_depth_format) {
case vk::Format::eD16Unorm:
case vk::Format::eD16UnormS8Uint: host_depth_bits = 16; break;
case vk::Format::eD24UnormS8Uint: host_depth_bits = 24; break;
default:
// A fixed-point guest bias cannot be represented exactly by a floating-point host
// attachment without VK_EXT_depth_bias_control.
return guest_factor;
}
return std::ldexp(guest_factor, host_depth_bits + offset.neg_num_db_bits);
}
static const char* RenderColorTypeName(RenderColorType type) {
switch (type) {
case RenderColorType::NoColorOutput: return "NoColorOutput";
@@ -335,6 +355,22 @@ static PipelineDynamicParameters BuildGraphicsDynamicParams(const RenderCommandB
ret.stencil_front = depth.stencil_dynamic_front;
ret.stencil_back = depth.stencil_dynamic_back;
const auto& mode = ctx.GetModeControl();
const auto& poly_offset = ctx.GetPolyOffset();
const bool use_front = mode.poly_offset_front_enable && !mode.cull_front;
const bool use_back = mode.poly_offset_back_enable && !mode.cull_back;
ret.depth_bias_enable = use_front || use_back;
if (ret.depth_bias_enable) {
// Vulkan has one bias for both faces. Prefer a visible front face when both are enabled.
const float guest_constant_factor =
use_front ? poly_offset.front_offset : poly_offset.back_offset;
ret.depth_bias_constant_factor =
ConvertPolygonOffsetConstantFactor(guest_constant_factor, poly_offset, depth.format);
ret.depth_bias_clamp = poly_offset.clamp;
ret.depth_bias_slope_factor =
(use_front ? poly_offset.front_scale : poly_offset.back_scale) / 16.0f;
}
// CB_COLOR_CONTROL.operation controls special CB operations, not the normal color component
// write mask. Use CB_TARGET_MASK here so scanout passes with mode=Disable do not go black.
for (uint32_t i = 0; i < RENDER_COLOR_ATTACHMENTS_MAX; i++) {
@@ -379,6 +415,13 @@ static void SetDynamicParams(const RenderCommandBuffer& buffer, vk::CommandBuffe
}
vk_buffer.setLineWidth(line_width);
vk_buffer.setDepthBiasEnable(dynamic_params.depth_bias_enable ? VK_TRUE : VK_FALSE);
if (dynamic_params.depth_bias_enable) {
vk_buffer.setDepthBias(dynamic_params.depth_bias_constant_factor,
dynamic_params.depth_bias_clamp,
dynamic_params.depth_bias_slope_factor);
}
if (dynamic_params.stencil_test_enable) {
vk_buffer.setStencilCompareMask(vk::StencilFaceFlagBits::eFront,
dynamic_params.stencil_front.compareMask);