neurocyte/flow
neurocyte/flow
1
1
Fork 0
Code Issues Pull requests Projects Releases 5 Packages Wiki Activity Actions

fix(gui): eliminate row clipping at top of window

Browse source
This commit is contained in:
CJ van den Berg 2026-03-30 20:13:10 +02:00
parent 7fc2113b8a
commit a9efe0ca4c
Signed by: neurocyte
GPG key ID: 8EB1E1BB660E3FB9
2 changed files with 8 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

7
src/gui/gpu/builtin.glsl.zig
View file

@ -14,6 +14,7 @@ pub const FsParams = extern struct {
cell_size_y: i32,
col_count: i32,
row_count: i32,
viewport_height: i32,
};
const vs_src =
@ -32,6 +33,7 @@ const fs_src =
\\uniform int cell_size_y;
\\uniform int col_count;
\\uniform int row_count;
\\uniform int viewport_height;
\\uniform sampler2D glyph_tex_glyph_smp;
\\uniform usampler2D cell_tex_cell_smp;
\\out vec4 frag_color;
@ -47,10 +49,8 @@ const fs_src =
\\
\\void main() {
\\ // Convert gl_FragCoord (bottom-left origin) to top-left origin.
\\ // row_count * cell_size_y >= viewport height (we ceil the division),
\\ // so this formula maps the top screen pixel to row 0.
\\ int px = int(gl_FragCoord.x);
\\ int py = row_count * cell_size_y - 1 - int(gl_FragCoord.y);
\\ int py = viewport_height - 1 - int(gl_FragCoord.y);
\\ int col = px / cell_size_x;
\\ int row = py / cell_size_y;
\\
@ -99,6 +99,7 @@ pub fn shaderDesc(backend: sg.Backend) sg.ShaderDesc {
desc.uniform_blocks[0].glsl_uniforms[1] = .{ .type = .INT, .glsl_name = "cell_size_y" };
desc.uniform_blocks[0].glsl_uniforms[2] = .{ .type = .INT, .glsl_name = "col_count" };
desc.uniform_blocks[0].glsl_uniforms[3] = .{ .type = .INT, .glsl_name = "row_count" };
desc.uniform_blocks[0].glsl_uniforms[4] = .{ .type = .INT, .glsl_name = "viewport_height" };
// Glyph atlas texture: R8 → sample_type = FLOAT
desc.views[0].texture = .{

7
src/gui/gpu/gpu.zig
View file

@ -20,7 +20,7 @@ const Rgba8 = gui_cell.Rgba8;
const log = std.log.scoped(.gpu);
// Maximum glyph atlas dimension. 4096 is universally supported and gives
// 65536+ glyph slots at typical cell sizes — far more than needed in practice.
// 65536+ glyph slots at typical cell sizes - far more than needed in practice.
const max_atlas_dim: u16 = 4096;
fn getAtlasCellCount(cell_size: XY(u16)) XY(u16) {
@ -339,8 +339,8 @@ pub fn paint(
top: u16,
cells: []const Cell,
) void {
const shader_col_count: u16 = @intCast(@divTrunc(client_size.x + font.cell_size.x - 1, font.cell_size.x));
const shader_row_count: u16 = @intCast(@divTrunc(client_size.y + font.cell_size.y - 1, font.cell_size.y));
const shader_col_count: u16 = @intCast(@divTrunc(client_size.x, font.cell_size.x));
const shader_row_count: u16 = @intCast(@divTrunc(client_size.y, font.cell_size.y));
const copy_col_count: u16 = @min(col_count, shader_col_count);
const blank_glyph_index = state.generateGlyph(font, ' ', .single);
@ -422,6 +422,7 @@ pub fn paint(
.cell_size_y = font.cell_size.y,
.col_count = shader_col_count,
.row_count = shader_row_count,
.viewport_height = @intCast(client_size.y),
};
sg.applyUniforms(0, .{
.ptr = &fs_params,