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use indexed instancing for quads

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jacob 2025-05-27 03:31:52 -05:00
parent 1072f3225c
commit e040c00222
2 changed files with 78 additions and 56 deletions
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52
res/shaders/texture.hlsl
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@ -33,48 +33,32 @@ cbuffer constants : register(b0)
* Vertex shader
* ========================== */
static const float2 G_quad_verts[4] = {
float2(-0.5f, -0.5f),
float2( 0.5f, -0.5f),
float2( 0.5f, 0.5f),
float2(-0.5f, 0.5f)
};
static const int2 G_uv_factors[4] = {
int2(0, 0),
int2(1, 0),
int2(1, 1),
int2(0, 1)
};
ps_input vs_main(uint instance_id : SV_InstanceID, uint vertex_id : SV_VertexID)
{
// static float2 quad[4] = {
// float2(-0.5f, -0.5f),
// float2( 0.5f, -0.5f),
// float2( 0.5f, 0.5f),
// float2(-0.5f, 0.5f)
// };
vs_instance instance = G_instance_buffer[G_instance_offset + instance_id];
float2 vert = G_quad_verts[vertex_id];
float2 uv_factor = G_uv_factors[vertex_id];
static const uint indices[6] = { 0, 1, 2, 2, 3, 0 };
static const float2 vertices[4] = {
float2(-0.5f, -0.5f),
float2( 0.5f, -0.5f),
float2( 0.5f, 0.5f),
float2(-0.5f, 0.5f)
};
vs_instance instance = G_instance_buffer[instance_id + G_instance_offset];
int index = indices[vertex_id];
int top = index == 0 || index == 1;
int right = index == 1 || index == 2;
int bottom = index == 2 || index == 3;
int left = index == 3 || index == 0;
//int top = vertex_id == 0 || vertex_id == 2;
//int left = vertex_id == 0 || vertex_id == 1;
//int bottom = vertex_id == 1 || vertex_id == 3;
//int right = vertex_id == 2 || vertex_id == 3;
float2 vert = vertices[index];
float2 world_pos = xform_mul(instance.xf, vert);
float4 screen_pos = mul(G_projection, float4(world_pos, 0, 1));
float uv_x = instance.uv0.x * left;
uv_x += instance.uv1.x * right;
float uv_y = instance.uv0.y * top;
uv_y += instance.uv1.y * bottom;
ps_input output;
output.screen_pos = screen_pos;
output.uv = float2(uv_x, uv_y);
output.uv = instance.uv0 + uv_factor * (instance.uv1 - instance.uv0);
output.tint_lin = linear_from_srgb32(instance.tint_srgb);
return output;

82
src/gpu_dx11.c
View File

@ -54,7 +54,6 @@ enum dx11_shader_kind {
struct dx11_shader {
enum dx11_shader_kind kind;
b32 valid; /* Is this shader allocated */
u32 vertex_size;
ID3D11InputLayout *input_layout;
ID3D11VertexShader *vs;
ID3D11PixelShader *ps;
@ -176,7 +175,6 @@ struct handle_store {
struct dx11_shader_desc {
enum dx11_shader_kind kind;
char *name_cstr;
u32 vertex_size;
D3D11_INPUT_ELEMENT_DESC input_layout_desc[64]; /* NULL terminated array */
/* Internal */
@ -221,12 +219,14 @@ GLOBAL struct {
struct arena textures_arena;
struct dx11_texture *first_free_texture;
/* Sparse array (store.valid) */
struct gpu_cmd_store stores[MAX_CMD_STORES];
/* Shaders */
struct dx11_shader shaders[NUM_DX11_SHADER_KINDS];
struct dx11_shader_desc shader_info[NUM_DX11_SHADER_KINDS];
/* Dummy buffers */
struct dx11_buffer *dummy_vertex_buffer;
struct dx11_buffer *quad_index_buffer;
} G = ZI, DEBUG_ALIAS(G, G_gpu_dx11);
/* ========================== *
@ -247,6 +247,7 @@ INLINE struct mat4x4 calculate_vp(struct xform view, f32 viewport_width, f32 vie
INTERNAL void init_shader_table(void);
INTERNAL void reload_shader(struct dx11_shader *shader, struct dx11_shader_desc *desc);
INTERNAL struct dx11_buffer *dx11_buffer_alloc(struct D3D11_BUFFER_DESC desc, D3D11_SUBRESOURCE_DATA *initial_data);
#if RESOURCE_RELOADING
INTERNAL RESOURCE_WATCH_CALLBACK_FUNC_DEF(shader_resource_watch_callback, name);
@ -459,6 +460,29 @@ struct gpu_startup_receipt gpu_startup(struct sys_window *window)
}
logf_info("Finished compiling shaders");
/* Init dummy buffers */
{
/* Dummy vertex buffer */
u8 dummy_data[16] = ZI;
D3D11_BUFFER_DESC vdesc = ZI;
vdesc.Usage = D3D11_USAGE_IMMUTABLE;
vdesc.ByteWidth = sizeof(dummy_data);
vdesc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
D3D11_SUBRESOURCE_DATA dummy_data_subres = ZI;
dummy_data_subres.pSysMem = dummy_data;
G.dummy_vertex_buffer = dx11_buffer_alloc(vdesc, &dummy_data_subres);
/* Quad index buffer */
LOCAL_PERSIST u16 quad_indices[6] = { 0, 1, 2, 0, 2, 3 };
D3D11_BUFFER_DESC idesc = ZI;
idesc.Usage = D3D11_USAGE_IMMUTABLE;
idesc.ByteWidth = sizeof(quad_indices);
idesc.BindFlags = D3D11_BIND_INDEX_BUFFER;
D3D11_SUBRESOURCE_DATA idata = ZI;
idata.pSysMem = quad_indices;
G.quad_index_buffer = dx11_buffer_alloc(idesc, &idata);
}
/* Setup file change callbacks */
#if RESOURCE_RELOADING
resource_register_watch_callback(shader_resource_watch_callback);
@ -483,10 +507,6 @@ PACK(struct dx11_triangle_vertex {
u32 tint_srgb;
});
PACK(struct dx11_texture_vertex {
struct v2 pos;
});
/* Texture structs */
PACK(struct dx11_texture_uniform {
@ -527,7 +547,6 @@ INTERNAL void init_shader_table(void)
G.shader_info[DX11_SHADER_KIND_TRIANGLE] = (struct dx11_shader_desc) {
.kind = DX11_SHADER_KIND_TRIANGLE,
.name_cstr = "shaders/triangle.hlsl",
.vertex_size = sizeof(struct dx11_triangle_vertex),
.input_layout_desc = {
{ "pos", 0, DXGI_FORMAT_R32G32_FLOAT, 0, D3D11_APPEND_ALIGNED_ELEMENT, D3D11_INPUT_PER_VERTEX_DATA, 0 },
{ "uv", 0, DXGI_FORMAT_R32G32_FLOAT, 0, D3D11_APPEND_ALIGNED_ELEMENT, D3D11_INPUT_PER_VERTEX_DATA, 0 },
@ -538,18 +557,13 @@ INTERNAL void init_shader_table(void)
/* Texture shader layout */
G.shader_info[DX11_SHADER_KIND_TEXTURE] = (struct dx11_shader_desc) {
.kind = DX11_SHADER_KIND_TEXTURE,
.name_cstr = "shaders/texture.hlsl",
.vertex_size = sizeof(struct dx11_texture_vertex),
.input_layout_desc = {
{ "pos", 0, DXGI_FORMAT_R32G32_FLOAT, 0, D3D11_APPEND_ALIGNED_ELEMENT, D3D11_INPUT_PER_VERTEX_DATA, 0 }
}
.name_cstr = "shaders/texture.hlsl"
};
/* Grid shader layout */
G.shader_info[DX11_SHADER_KIND_GRID] = (struct dx11_shader_desc) {
.kind = DX11_SHADER_KIND_GRID,
.name_cstr = "shaders/grid.hlsl",
.vertex_size = sizeof(struct dx11_grid_vertex),
.input_layout_desc = {
{ "pos", 0, DXGI_FORMAT_R32G32_FLOAT, 0, D3D11_APPEND_ALIGNED_ELEMENT, D3D11_INPUT_PER_VERTEX_DATA, 0 },
{ "line_thickness", 0, DXGI_FORMAT_R32_FLOAT, 0, D3D11_APPEND_ALIGNED_ELEMENT, D3D11_INPUT_PER_VERTEX_DATA, 0 },
@ -723,7 +737,6 @@ INTERNAL struct string shader_alloc(struct arena *arena, struct dx11_shader *sha
struct string shader_name = string_from_cstr_no_limit(shader_desc->name_cstr);
shader->kind = shader_desc->kind;
shader->vertex_size = shader_desc->vertex_size;
#if RESOURCE_RELOADING
shader_reset_includes(shader_desc);
#endif
@ -892,8 +905,8 @@ INTERNAL RESOURCE_WATCH_CALLBACK_FUNC_DEF(shader_resource_watch_callback, name)
/* TODO: Buffer caching based on size */
/* NOTE: desc ByteWidth will be ignored (set dynamically when buffer grows) */
INTERNAL struct dx11_buffer *dx11_buffer_alloc(struct D3D11_BUFFER_DESC desc)
/* NOTE: If initial_data is not provided, then ByteWidth will be ignored (set dynamically when buffer grows) */
INTERNAL struct dx11_buffer *dx11_buffer_alloc(struct D3D11_BUFFER_DESC desc, D3D11_SUBRESOURCE_DATA *initial_data)
{
__prof;
struct dx11_buffer *buffer = NULL;
@ -918,6 +931,26 @@ INTERNAL struct dx11_buffer *dx11_buffer_alloc(struct D3D11_BUFFER_DESC desc)
}
buffer->desc = desc;
buffer->cpu_buffer = arena_dry_push(&buffer->cpu_buffer_arena, u8);
if (desc.BindFlags & D3D11_BIND_SHADER_RESOURCE) {
ASSERT(desc.StructureByteStride != 0); /* Must provide stride for shader resource buffers */
}
if (initial_data) {
ASSERT(desc.ByteWidth > 0); /* Must provide size of subresource in desc */
buffer->gpu_buffer_capacity = desc.ByteWidth;
ID3D11Device_CreateBuffer(G.dev, &buffer->desc, initial_data, &buffer->gpu_buffer);
/* Create SRV */
if (desc.BindFlags & D3D11_BIND_SHADER_RESOURCE) {
D3D11_SHADER_RESOURCE_VIEW_DESC srv_desc = ZI;
srv_desc.Format = DXGI_FORMAT_UNKNOWN;
srv_desc.ViewDimension = D3D11_SRV_DIMENSION_BUFFER;
srv_desc.Buffer.NumElements = buffer->gpu_buffer_capacity / buffer->desc.StructureByteStride;
ID3D11Device_CreateShaderResourceView(G.dev, (ID3D11Resource *)buffer->gpu_buffer, &srv_desc, &buffer->srv);
}
}
return buffer;
}
@ -1044,7 +1077,7 @@ struct gpu_cmd_store gpu_cmd_store_alloc(void)
{
/* Constant buffer */
{
store->buffers.constant_buffer = dx11_buffer_alloc(constant_buffer_desc);
store->buffers.constant_buffer = dx11_buffer_alloc(constant_buffer_desc, NULL);
}
/* Triangle buffers */
@ -1059,7 +1092,7 @@ struct gpu_cmd_store gpu_cmd_store_alloc(void)
{
struct D3D11_BUFFER_DESC desc = structured_buffer_desc;
desc.StructureByteStride = sizeof(struct dx11_texture_instance);
store->buffers.texture.instance_buffer = dx11_buffer_alloc(desc);
store->buffers.texture.instance_buffer = dx11_buffer_alloc(desc, NULL);
}
/* Grid buffers */
@ -1316,6 +1349,11 @@ void gpu_run_cmds(struct gpu_cmd_store gpu_cmd_store, struct gpu_texture target,
ID3D11DeviceContext_PSSetConstantBuffers(G.devcon, 0, 1, &constant_buffer->gpu_buffer);
#endif
/* Bind dummy vertex buffer */
u32 zero = 0;
ID3D11DeviceContext_IASetVertexBuffers(G.devcon, 0, 1, &G.dummy_vertex_buffer->gpu_buffer, &zero, &zero);
ID3D11DeviceContext_IASetIndexBuffer(G.devcon, G.quad_index_buffer->gpu_buffer, DXGI_FORMAT_R16_UINT, zero);
/* Bind texture */
ID3D11DeviceContext_VSSetShaderResources(G.devcon, 0, 1, &texture->srv);
ID3D11DeviceContext_PSSetShaderResources(G.devcon, 0, 1, &texture->srv);
@ -1326,7 +1364,7 @@ void gpu_run_cmds(struct gpu_cmd_store gpu_cmd_store, struct gpu_texture target,
/* Draw */
ID3D11DeviceContext_IASetPrimitiveTopology(G.devcon, D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
ID3D11DeviceContext_DrawInstanced(G.devcon, 6, instance_count, 0, 0);
ID3D11DeviceContext_DrawIndexedInstanced(G.devcon, 6, instance_count, 0, 0, 0);
/* Unbind SRVs */
ID3D11DeviceContext_VSSetShaderResources(G.devcon, 0, 8, null_srvs);