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draw: increase far Z, separate path for space quads, fix billboard batching

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This commit is contained in:
veclavtalica
2025-02-26 13:27:09 +03:00
parent 5f3920fdba
commit a36459397e
10 changed files with 190 additions and 59 deletions
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3
apps/demos/scenery/scenes/ingame.c
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@@ -12,7 +12,7 @@
#define TERRAIN_FREQUENCY 0.15f
#define TERRAIN_DISTANCE 64
#define TERRAIN_DISTANCE 128
#define HALF_TERRAIN_DISTANCE ((float)TERRAIN_DISTANCE / 2)
#define PLAYER_HEIGHT 0.6f
@@ -161,6 +161,7 @@ static void draw_terrain(SceneIngame *scn) {
(Rect){ .w = 128, .h = 128 },
(Color){255, 255, 255, 255});
/* TODO: only draw upclose */
draw_billboard("/assets/grasses/10.png",
(Vec3){ (float)x, d0 + 0.15f, (float)y },
(Vec2){0.3f, 0.3f},

13
src/rendering/twn_billboards.c
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@@ -95,14 +95,15 @@ void finally_draw_billboard_batch(struct MeshBatch const *batch,
const Vec2 uv3c = { xr + wr, yr };
for (size_t batch_n = 0; batch_n <= (primitives_len - 1) / QUAD_ELEMENT_BUFFER_LENGTH; batch_n++) {
size_t const processing = MIN(primitives_len - batch_n * QUAD_ELEMENT_BUFFER_LENGTH, QUAD_ELEMENT_BUFFER_LENGTH);
/* emit vertex data */
VertexBuffer const buffer = get_scratch_vertex_array();
VertexBufferBuilder builder = build_vertex_buffer(
buffer,
sizeof (ElementIndexedBillboard) * MIN(primitives_len - batch_n * QUAD_ELEMENT_BUFFER_LENGTH, QUAD_ELEMENT_BUFFER_LENGTH));
sizeof (ElementIndexedBillboard) * processing);
for (size_t i = 0; i < primitives_len; ++i) {
for (size_t i = 0; i < processing; ++i) {
struct SpaceBillboard const billboard = ((SpaceBillboard *)(void *)batch->primitives)[batch_n * QUAD_ELEMENT_BUFFER_LENGTH + i];
/* a = (right + up) * size, b = (right - up) * size*/
@@ -179,20 +180,20 @@ void finally_draw_billboard_batch(struct MeshBatch const *batch,
.buffer = buffer
};
command.textured = true;
command.texture_key = texture_key;
command.textured = true;
command.element_buffer = get_quad_element_buffer();
command.element_count = 6 * (uint32_t)primitives_len;
command.range_end = 6 * (uint32_t)primitives_len;
command.element_count = 6 * (uint32_t)processing;
command.range_end = 6 * (uint32_t)processing;
/* TODO: support alpha blended case, with distance sort */
TextureMode mode = textures_get_mode(&ctx.texture_cache, texture_key);
if (mode == TEXTURE_MODE_GHOSTLY)
mode = TEXTURE_MODE_SEETHROUGH;
command.texture_mode = mode;
command.pipeline = PIPELINE_SPACE;
command.texture_mode = mode;
command.depth_range_high = depth_range_high;
command.depth_range_low = depth_range_low;

42
src/rendering/twn_draw.c
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@@ -52,6 +52,9 @@ void render_clear(void) {
for (size_t i = 0; i < hmlenu(ctx.billboard_batches); ++i)
arrsetlen(ctx.billboard_batches[i].value.primitives, 0);
for (size_t i = 0; i < hmlenu(ctx.quad_batches); ++i)
arrsetlen(ctx.quad_batches[i].value.primitives, 0);
}
@@ -196,31 +199,6 @@ void draw_nine_slice(const char *texture, Vec2 corners, Rect rect, float border_
}
TWN_API void draw_quad(char const *texture,
Vec3 v0, /* upper-left */
Vec3 v1, /* bottom-left */
Vec3 v2, /* bottom-right */
Vec3 v3, /* upper-right */
Rect texture_region,
Color color)
{
Vec2 const uv0 = { texture_region.x, texture_region.y };
Vec2 const uv1 = { texture_region.x, texture_region.y + texture_region.h };
Vec2 const uv2 = { texture_region.x + texture_region.w, texture_region.y + texture_region.h };
Vec2 const uv3 = { texture_region.x + texture_region.w, texture_region.y };
draw_triangle(texture,
v0, v1, v3,
uv0, uv1, uv3,
color, color, color);
draw_triangle(texture,
v3, v1, v2,
uv3, uv1, uv2,
color, color, color);
}
static void render_2d(void) {
const size_t render_queue_len = arrlenu(ctx.render_queue_2d);
@@ -397,18 +375,16 @@ static void render_2d(void) {
static void render_space(void) {
finally_draw_models();
/* nothing to do, abort */
/* as space pipeline isn't used we can have fewer changes and initialization costs */
if (hmlenu(ctx.uncolored_mesh_batches) != 0 || hmlenu(ctx.billboard_batches) != 0) {
for (size_t i = 0; i < hmlenu(ctx.uncolored_mesh_batches); ++i) {
for (size_t i = 0; i < hmlenu(ctx.uncolored_mesh_batches); ++i)
finally_draw_uncolored_space_traingle_batch(&ctx.uncolored_mesh_batches[i].value,
ctx.uncolored_mesh_batches[i].key);
}
for (size_t i = 0; i < hmlenu(ctx.billboard_batches); ++i) {
for (size_t i = 0; i < hmlenu(ctx.quad_batches); ++i)
finally_draw_space_quads_batch(&ctx.quad_batches[i].value,
ctx.quad_batches[i].key);
for (size_t i = 0; i < hmlenu(ctx.billboard_batches); ++i)
finally_draw_billboard_batch(&ctx.billboard_batches[i].value, ctx.billboard_batches[i].key);
}
}
render_skybox(); /* after everything else, as to use depth buffer for early z rejection */
}

6
src/rendering/twn_draw_c.h
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@@ -23,7 +23,7 @@ extern float camera_2d_zoom;
extern double depth_range_low, depth_range_high;
#define QUAD_ELEMENT_BUFFER_LENGTH (65536 / 6)
#define QUAD_ELEMENT_BUFFER_LENGTH ((65536 * 1) / 6)
#define CIRCLE_VERTICES_MAX 2048
/* TODO: limit to only most necessary */
@@ -217,6 +217,7 @@ typedef struct ElementIndexedQuadWithoutColorWithoutTexture {
Vec2 v3;
} ElementIndexedQuadWithoutColorWithoutTexture;
/* TODO: rename to space quad */
/* TODO: no color variant */
typedef struct ElementIndexedBillboard {
/* upper-left */
@@ -334,6 +335,9 @@ void push_quad_payload_to_vertex_buffer_builder(struct QuadBatch batch,
Vec2 uv0, Vec2 uv1, Vec2 uv2, Vec2 uv3,
Color color);
void finally_draw_space_quads_batch(const MeshBatch *batch,
const TextureKey texture_key);
void finally_draw_text(FontData const *font_data,
size_t len,
Color color,

5
src/rendering/twn_gl_15_rendering.c
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@@ -584,8 +584,8 @@ void finally_draw_command(DeferredCommandDraw command) {
finally_use_texture_mode(command.texture_mode);
glBindBuffer(GL_ARRAY_BUFFER, command.vertices.buffer);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, command.element_buffer);
glBindBuffer(GL_ARRAY_BUFFER, command.vertices.buffer);
glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(command.vertices.arity,
@@ -637,7 +637,7 @@ void finally_draw_command(DeferredCommandDraw command) {
command.range_start,
command.range_end,
command.element_count,
GL_UNSIGNED_SHORT,
GL_UNSIGNED_INT,
NULL);
} else {
SDL_assert(command.primitive_count != 0);
@@ -661,6 +661,7 @@ void finally_draw_command(DeferredCommandDraw command) {
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
}
void render_line(const LinePrimitive *line) {
finally_use_2d_pipeline();
glBegin(GL_LINES);

14
src/rendering/twn_gl_any_rendering.c
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@@ -62,15 +62,15 @@ IndexBuffer get_quad_element_buffer(void) {
/* TODO: use builder interface, not direct calls (glMapBuffer isn't portable) */
if (buffer == 0) {
buffer = create_index_buffer();
IndexBufferBuilder builder = build_index_buffer(buffer, sizeof (GLshort) * QUAD_ELEMENT_BUFFER_LENGTH * 6 );
IndexBufferBuilder builder = build_index_buffer(buffer, sizeof (GLuint) * QUAD_ELEMENT_BUFFER_LENGTH * 6 );
for (size_t i = 0; i < QUAD_ELEMENT_BUFFER_LENGTH; ++i) {
((GLshort *)builder.base)[i * 6 + 0] = (GLshort)(i * 4 + 0);
((GLshort *)builder.base)[i * 6 + 1] = (GLshort)(i * 4 + 1);
((GLshort *)builder.base)[i * 6 + 2] = (GLshort)(i * 4 + 2);
((GLshort *)builder.base)[i * 6 + 3] = (GLshort)(i * 4 + 2);
((GLshort *)builder.base)[i * 6 + 4] = (GLshort)(i * 4 + 3);
((GLshort *)builder.base)[i * 6 + 5] = (GLshort)(i * 4 + 0);
((GLuint *)builder.base)[i * 6 + 0] = (GLuint)(i * 4 + 0);
((GLuint *)builder.base)[i * 6 + 1] = (GLuint)(i * 4 + 1);
((GLuint *)builder.base)[i * 6 + 2] = (GLuint)(i * 4 + 2);
((GLuint *)builder.base)[i * 6 + 3] = (GLuint)(i * 4 + 2);
((GLuint *)builder.base)[i * 6 + 4] = (GLuint)(i * 4 + 3);
((GLuint *)builder.base)[i * 6 + 5] = (GLuint)(i * 4 + 0);
}
finish_index_builder(&builder);

147
src/rendering/twn_quads.c
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@@ -1,4 +1,8 @@
#include "twn_draw_c.h"
#include "twn_draw.h"
#include "twn_engine_context_c.h"
#include "twn_util.h"
#include "twn_util_c.h"
#include <stb_ds.h>
@@ -171,3 +175,146 @@ void push_quad_payload_to_vertex_buffer_builder(struct QuadBatch batch,
((ElementIndexedQuadWithoutColorWithoutTexture *)builder->base)[index] = payload;
}
}
void draw_quad(char const *texture,
Vec3 v0, /* upper-left */
Vec3 v1, /* bottom-left */
Vec3 v2, /* bottom-right */
Vec3 v3, /* upper-right */
Rect texture_region,
Color color)
{
Vec2 const uv0 = { texture_region.x, texture_region.y };
Vec2 const uv1 = { texture_region.x, texture_region.y + texture_region.h };
Vec2 const uv2 = { texture_region.x + texture_region.w, texture_region.y + texture_region.h };
Vec2 const uv3 = { texture_region.x + texture_region.w, texture_region.y };
// TODO: order drawing by atlas id as well, so that texture rebinding is not as common
const TextureKey texture_key = textures_get_key(&ctx.texture_cache, texture);
struct MeshBatchItem *batch_p = hmgetp_null(ctx.quad_batches, texture_key);
if (!batch_p) {
struct MeshBatch item = {0};
hmput(ctx.quad_batches, texture_key, item);
batch_p = &ctx.quad_batches[hmlenu(ctx.quad_batches) - 1]; /* TODO: can last index be used? */
}
/* TODO: rename from billboards */
struct ElementIndexedBillboard billboard = {
.v0 = v0,
.v1 = v1,
.v2 = v2,
.v3 = v3,
/* will be adjusted later when atlas is baked */
.uv0 = uv0,
.uv1 = uv1,
.uv2 = uv2,
.uv3 = uv3,
/* flat shading is assumed, so we can skip setting the duplicates */
.c0 = color,
// .c1 = color,
.c2 = color,
// .c3 = color,
};
struct ElementIndexedBillboard *billboards = (struct ElementIndexedBillboard *)(void *)batch_p->value.primitives;
arrpush(billboards, billboard);
batch_p->value.primitives = (uint8_t *)billboards;
}
void finally_draw_space_quads_batch(const MeshBatch *batch,
const TextureKey texture_key)
{
const size_t primitives_len = arrlenu(batch->primitives);
/* nothing to do */
if (primitives_len == 0)
return;
const Rect srcrect = textures_get_srcrect(&ctx.texture_cache, texture_key);
const Rect dims = textures_get_dims(&ctx.texture_cache, texture_key);
const float wr = srcrect.w / dims.w;
const float hr = srcrect.h / dims.h;
const float xr = srcrect.x / dims.w;
const float yr = srcrect.y / dims.h;
/* update pixel-based uvs to correspond with texture atlases */
for (size_t i = 0; i < primitives_len; ++i) {
ElementIndexedBillboard *payload =
&((ElementIndexedBillboard *)(void *)batch->primitives)[i];
payload->uv0.x = xr + ((float)payload->uv0.x / srcrect.w) * wr;
payload->uv0.y = yr + ((float)payload->uv0.y / srcrect.h) * hr;
payload->uv1.x = xr + ((float)payload->uv1.x / srcrect.w) * wr;
payload->uv1.y = yr + ((float)payload->uv1.y / srcrect.h) * hr;
payload->uv2.x = xr + ((float)payload->uv2.x / srcrect.w) * wr;
payload->uv2.y = yr + ((float)payload->uv2.y / srcrect.h) * hr;
payload->uv3.x = xr + ((float)payload->uv3.x / srcrect.w) * wr;
payload->uv3.y = yr + ((float)payload->uv3.y / srcrect.h) * hr;
}
for (size_t batch_n = 0; batch_n <= (primitives_len - 1) / QUAD_ELEMENT_BUFFER_LENGTH; batch_n++) {
size_t const processing = MIN(primitives_len - batch_n * QUAD_ELEMENT_BUFFER_LENGTH, QUAD_ELEMENT_BUFFER_LENGTH);
VertexBuffer const buffer = get_scratch_vertex_array();
specify_vertex_buffer(buffer, &batch->primitives[batch_n * QUAD_ELEMENT_BUFFER_LENGTH], sizeof (ElementIndexedBillboard) * processing);
DeferredCommandDraw command = {0};
command.vertices = (AttributeArrayPointer) {
.arity = 3,
.type = TWN_FLOAT,
.stride = offsetof(ElementIndexedBillboard, v1),
.offset = offsetof(ElementIndexedBillboard, v0),
.buffer = buffer
};
command.texcoords = (AttributeArrayPointer) {
.arity = 2,
.type = TWN_FLOAT,
.stride = offsetof(ElementIndexedBillboard, v1),
.offset = offsetof(ElementIndexedBillboard, uv0),
.buffer = buffer
};
command.colors = (AttributeArrayPointer) {
.arity = 4,
.type = TWN_UNSIGNED_BYTE,
.stride = offsetof(ElementIndexedBillboard, v1),
.offset = offsetof(ElementIndexedBillboard, c0),
.buffer = buffer
};
command.texture_key = texture_key;
command.textured = true;
command.element_buffer = get_quad_element_buffer();
command.element_count = 6 * (uint32_t)processing;
command.range_end = 6 * (uint32_t)processing;
/* TODO: support alpha blended case, with distance sort */
TextureMode mode = textures_get_mode(&ctx.texture_cache, texture_key);
if (mode == TEXTURE_MODE_GHOSTLY)
mode = TEXTURE_MODE_SEETHROUGH;
command.pipeline = PIPELINE_SPACE;
command.texture_mode = mode;
command.depth_range_high = depth_range_high;
command.depth_range_low = depth_range_low;
DeferredCommand final_command = {
.type = DEFERRED_COMMAND_TYPE_DRAW,
.draw = command
};
arrpush(deferred_commands, final_command);
}
}

2
src/twn_camera.c
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@@ -6,7 +6,7 @@
#define CAMERA_NEAR_Z 0.1f
#define CAMERA_FAR_Z 100.0f
#define CAMERA_FAR_Z 1000.0f
Matrix4 camera_look_at(const Camera *const camera) {

1
src/twn_engine_context_c.h
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@@ -49,6 +49,7 @@ typedef struct EngineContext {
Primitive2D *render_queue_2d;
MeshBatchItem *uncolored_mesh_batches;
MeshBatchItem *billboard_batches;
MeshBatchItem *quad_batches;
TextCache text_cache;
TextureCache texture_cache;