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Use dynamic state for viewports to avoid pipeline recreation

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This commit is contained in:
Robin Voetter
2020-07-04 17:30:22 +02:00
parent 40b74caee5
commit 8c9bb747c3
2 changed files with 25 additions and 23 deletions
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46
examples/main.zig
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@@ -85,9 +85,6 @@ pub fn main() !void {
extent.height = @intCast(u32, h);
try swapchain.recreate(extent);
gc.vkd.destroyPipeline(gc.dev, pipeline, null);
pipeline = try createPipeline(&gc, extent, pipeline_layout, render_pass);
destroyFramebuffers(&gc, allocator, framebuffers);
framebuffers = try createFramebuffers(&gc, allocator, render_pass, swapchain);
@@ -133,12 +130,29 @@ fn createCommandBuffers(
.color = .{.float_32 = .{0, 0, 0, 1}},
};
const viewport = vk.Viewport{
.x = 0,
.y = 0,
.width = @intToFloat(f32, extent.width),
.height = @intToFloat(f32, extent.height),
.min_depth = 0,
.max_depth = 1,
};
const scissor = vk.Rect2D{
.offset = .{.x = 0, .y = 0},
.extent = extent,
};
for (cmdbufs) |cmdbuf, i| {
try gc.vkd.beginCommandBuffer(cmdbuf, .{
.flags = .{},
.p_inheritance_info = null,
});
gc.vkd.cmdSetViewport(cmdbuf, 0, 1, @ptrCast([*]const vk.Viewport, &viewport));
gc.vkd.cmdSetScissor(cmdbuf, 0, 1, @ptrCast([*]const vk.Rect2D, &scissor));
gc.vkd.cmdBeginRenderPass(cmdbuf, .{
.render_pass = render_pass,
.framebuffer = framebuffers[i],
@@ -291,26 +305,12 @@ fn createPipeline(
.primitive_restart_enable = vk.FALSE,
};
const viewport = vk.Viewport{
.x = 0,
.y = 0,
.width = @intToFloat(f32, extent.width),
.height = @intToFloat(f32, extent.height),
.min_depth = 0,
.max_depth = 1,
};
const scissor = vk.Rect2D{
.offset = .{.x = 0, .y = 0},
.extent = extent,
};
const pvsci = vk.PipelineViewportStateCreateInfo{
.flags = .{},
.viewport_count = 1,
.p_viewports = @ptrCast([*]const vk.Viewport, &viewport),
.p_viewports = undefined, // set in createCommandBuffers with cmdSetViewport
.scissor_count = 1,
.p_scissors = @ptrCast([*]const vk.Rect2D, &scissor),
.p_scissors = undefined, // set in createCommandBuffers with cmdSetScissor
};
const prsci = vk.PipelineRasterizationStateCreateInfo{
@@ -357,11 +357,11 @@ fn createPipeline(
.blend_constants = [_]f32{0, 0, 0, 0},
};
const dynstate = vk.DynamicState.viewport;
const dynstate = [_]vk.DynamicState{.viewport, .scissor};
const pdsci = vk.PipelineDynamicStateCreateInfo{
.flags = .{},
.dynamic_state_count = 1,
.p_dynamic_states = @ptrCast([*]const vk.DynamicState, &dynstate),
.dynamic_state_count = dynstate.len,
.p_dynamic_states = &dynstate,
};
const gpci = vk.GraphicsPipelineCreateInfo{
@@ -376,7 +376,7 @@ fn createPipeline(
.p_multisample_state = &pmsci,
.p_depth_stencil_state = null,
.p_color_blend_state = &pcbsci,
.p_dynamic_state = null, //&pdsci,
.p_dynamic_state = &pdsci,
.layout = layout,
.render_pass = render_pass,
.subpass = 0,