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Add Framebuffer object

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This commit is contained in:
Josh Holtrop 2022-03-21 16:32:11 -04:00
parent 15559b0a56
commit c3ead56582
2 changed files with 63 additions and 1 deletions
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56
src/hulk/framebuffer.d Normal file
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@ -0,0 +1,56 @@
/**
* HULK Framebuffer support.
*/
module hulk.framebuffer;
import hos.memory;
/**
* Represent a graphical frame buffer.
*
* TODO: Handle other pixel formats. Currently only ARGB is supported.
*/
struct Framebuffer
{
/** Frame buffer base address. */
private uint * m_buffer;
/** Frame buffer width. */
private uint m_width;
/** Frame buffer height. */
private uint m_height;
/** Frame buffer stride. */
private uint m_stride;
/** Number of pixels in the frame buffer (whether visible or not). */
private uint m_buffer_size;
/**
* Initialize a frame buffer.
*
* @param buffer Frame buffer base address.
* @param width Frame buffer width.
* @param height Frame buffer height.
* @param stride Frame buffer stride.
*/
void initialize(uint * buffer, uint width, uint height, uint stride)
{
m_buffer = buffer;
m_width = width;
m_height = height;
m_stride = stride;
m_buffer_size = stride * height;
}
/**
* Clear the frame buffer to the given color.
*
* @param color Color to clear to.
*/
void clear(uint color = 0u)
{
memset32(m_buffer, color, m_buffer_size);
}
}

8
src/hulk/hulk.d
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@ -5,9 +5,12 @@ module hulk.hulk;
import hulk.header;
import hulk.bootinfo;
import hulk.framebuffer;
import hos.memory;
import ldc.attributes;
private __gshared Framebuffer fb;
extern extern(C) __gshared ubyte _hulk_total_size;
@(ldc.attributes.section(".hulk_header"))
@ -23,9 +26,12 @@ private __gshared Header hulk_header = {
*/
extern(C) void hulk_start(ulong rdi, ulong rsi, ulong rdx, BootInfo * bootinfo)
{
fb.initialize(bootinfo.fb.buffer, bootinfo.fb.width, bootinfo.fb.height, bootinfo.fb.stride);
fb.clear(0xFF8800u);
for (size_t y = 100u; y < 120u; y++)
{
memset32(&bootinfo.fb.buffer[y * bootinfo.fb.stride + 20u], 0xFF8800u, 20u);
memset32(&bootinfo.fb.buffer[y * bootinfo.fb.stride + 20u], 0x001199u, 20u);
}
for (;;)