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Move primitive text rendering into a function

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David Gonzalez Martin 2024-11-30 18:35:20 -06:00 committed by David
parent 39185a614d
commit 2d349436da
1 changed files with 63 additions and 58 deletions
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121
bootstrap/bloat-buster/bb_core.c
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@ -30,6 +30,65 @@ STRUCT(GPUDrawPushConstants)
f32 height;
};
fn void draw_string(Renderer* renderer, VirtualBuffer(Vertex)* vertices, VirtualBuffer(u32)* indices, u32 width, u32 height, Vec4 color, String string, TextureAtlas texture_atlas)
{
u32 index_offset = 0;
auto x_offset = width / 2;
auto y_offset = height / 2;
for (u64 i = 0; i < string.length; i += 1, index_offset += 4)
{
auto ch = string.pointer[i];
auto* character = &texture_atlas.characters[ch];
auto pos_x = x_offset;
auto pos_y = y_offset - (character->height + character->y_offset);
auto uv_x = character->x;
auto uv_y = character->y;
auto uv_width = character->width;
auto uv_height = character->height;
*vb_add(vertices, 1) = (Vertex) {
.x = pos_x,
.y = pos_y,
.uv_x = (f32)uv_x / texture_atlas.width,
.uv_y = (f32)uv_y / texture_atlas.width,
.color = color,
};
*vb_add(vertices, 1) = (Vertex) {
.x = pos_x + character->width,
.y = pos_y,
.uv_x = (f32)(uv_x + uv_width) / texture_atlas.width,
.uv_y = (f32)uv_y / texture_atlas.width,
.color = color,
};
*vb_add(vertices, 1) = (Vertex) {
.x = pos_x,
.y = pos_y + character->height,
.uv_x = (f32)uv_x / texture_atlas.width,
.uv_y = (f32)(uv_y + uv_height) / texture_atlas.width,
.color = color,
};
*vb_add(vertices, 1) = (Vertex) {
.x = pos_x + character->width,
.y = pos_y + character->height,
.uv_x = (f32)(uv_x + uv_width) / texture_atlas.width,
.uv_y = (f32)(uv_y + uv_height) / texture_atlas.width,
.color = color,
};
*vb_add(indices, 1) = index_offset + 0;
*vb_add(indices, 1) = index_offset + 1;
*vb_add(indices, 1) = index_offset + 2;
*vb_add(indices, 1) = index_offset + 1;
*vb_add(indices, 1) = index_offset + 3;
*vb_add(indices, 1) = index_offset + 2;
auto kerning = (texture_atlas.kerning_tables + ch * 256)[string.pointer[i + 1]];
// print("Advance: {u32}. Kerning: {s32}\n", character->advance, kerning);
x_offset += character->advance + kerning;
}
}
void run_app(Arena* arena)
{
u8 use_x11 = 1;
@ -123,67 +182,13 @@ strlit("/usr/share/fonts/TTF/FiraSans-Regular.ttf")
renderer_update_pipeline_resources(renderer, pipeline_index, (Slice(DescriptorSetUpdate)) array_to_slice(descriptor_set_updates));
VirtualBuffer(Vertex) vertices = {};
VirtualBuffer(u32) indices = {};
Vec4 color = {1, 1, 1, 1};
static_assert(sizeof(color) == 4 * sizeof(float));
auto string = strlit("Hello world!");
VirtualBuffer(Vertex) vertices = {};
VirtualBuffer(u32) indices = {};
u32 index_offset = 0;
auto x_offset = initial_window_size.width / 2;
auto y_offset = initial_window_size.height / 2;
for (u64 i = 0; i < string.length; i += 1, index_offset += 4)
{
auto ch = string.pointer[i];
auto* character = &texture_atlas.characters[ch];
auto pos_x = x_offset;
auto pos_y = y_offset - (character->height + character->y_offset);
auto uv_x = character->x;
auto uv_y = character->y;
auto uv_width = character->width;
auto uv_height = character->height;
*vb_add(&vertices, 1) = (Vertex) {
.x = pos_x,
.y = pos_y,
.uv_x = (f32)uv_x / texture_atlas.width,
.uv_y = (f32)uv_y / texture_atlas.width,
.color = color,
};
*vb_add(&vertices, 1) = (Vertex) {
.x = pos_x + character->width,
.y = pos_y,
.uv_x = (f32)(uv_x + uv_width) / texture_atlas.width,
.uv_y = (f32)uv_y / texture_atlas.width,
.color = color,
};
*vb_add(&vertices, 1) = (Vertex) {
.x = pos_x,
.y = pos_y + character->height,
.uv_x = (f32)uv_x / texture_atlas.width,
.uv_y = (f32)(uv_y + uv_height) / texture_atlas.width,
.color = color,
};
*vb_add(&vertices, 1) = (Vertex) {
.x = pos_x + character->width,
.y = pos_y + character->height,
.uv_x = (f32)(uv_x + uv_width) / texture_atlas.width,
.uv_y = (f32)(uv_y + uv_height) / texture_atlas.width,
.color = color,
};
*vb_add(&indices, 1) = index_offset + 0;
*vb_add(&indices, 1) = index_offset + 1;
*vb_add(&indices, 1) = index_offset + 2;
*vb_add(&indices, 1) = index_offset + 1;
*vb_add(&indices, 1) = index_offset + 3;
*vb_add(&indices, 1) = index_offset + 2;
auto kerning = (texture_atlas.kerning_tables + ch * 256)[string.pointer[i + 1]];
// print("Advance: {u32}. Kerning: {s32}\n", character->advance, kerning);
x_offset += character->advance + kerning;
}
draw_string(renderer, &vertices, &indices, initial_window_size.width, initial_window_size.height, color, strlit("Hello world!"), texture_atlas);
auto vertex_buffer_size = sizeof(*vertices.pointer) * vertices.length;
auto index_buffer_size = sizeof(*indices.pointer) * indices.length;