82 lines
1.9 KiB
C
82 lines
1.9 KiB
C
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/*
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* Very tiny benchmark for very tiny 2D updates.
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*
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* This sets an SVGA video mode, and uses a sequence of very tiny 2D
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* FIFO updates to repaint the screen pixel-by-pixel in a loop. To
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* measure performance, attach mksPerfTool and view the amount of CPU
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* time used by the MKS and the number of FIFO commands per second.
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* Do *not* use the MKS "frames per second" as a performance metric
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* for this test, as the MKS's "frames" are arbitrary and unrelated
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* to our test's frames.
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*/
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#include "svga.h"
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#include "intr.h"
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/*
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* paintScreen --
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*
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* Repaint the screen once: Fill the framebuffer,
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* and use very tiny FIFO updates to cover it all.
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*/
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void
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paintScreen(uint32 color)
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{
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uint32 *fb = (uint32*) gSVGA.fbMem;
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int x, y;
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static uint32 fence = 0;
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/*
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* Flow control: Before we re-write the beginning of the
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* framebuffer, make sure the host has at least finished drawing
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* the beginning of the last frame.
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*
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* This isn't as strict as it should be: For proper 2D flow
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* control, we really need to either do a full sync at the end of
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* each frame, or double-buffer (alternating buffers on every other
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* frame). This method can produce glitches, but it's still decent
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* for benchmarking purposes.
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*/
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SVGA_SyncToFence(fence);
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fence = SVGA_InsertFence();
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/*
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* Update the screen, pixel by pixel.
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*/
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for (y = 0; y < gSVGA.height; y++) {
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uint32 *row = fb;
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fb = (uint32*) (gSVGA.pitch + (uint8*)fb);
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for (x = 0; x < gSVGA.width; x++) {
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*(row++) = color;
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SVGA_Update(x, y, 1, 1);
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}
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}
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}
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/*
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* main --
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*
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* Main loop and initialization.
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*/
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int
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main(void)
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{
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Intr_Init();
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Intr_SetFaultHandlers(SVGA_DefaultFaultHandler);
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SVGA_Init();
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SVGA_SetMode(640, 480, 32);
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while (1) {
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/* Alternate colors on each frame */
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paintScreen(0x747cba);
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paintScreen(0xbebebe);
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}
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return 0;
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}
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