void gsKit_init_screen(GSGLOBAL *gsGlobal)
{
u64 *p_data;
u64 *p_store;
int size = 18;
if((gsGlobal->Dithering == GS_SETTING_ON) &&
((gsGlobal->PSM == GS_PSM_CT16) || (gsGlobal->PSM == GS_PSM_CT16S)))
size = 19;
gsKit_set_buffer_attributes(gsGlobal);
#ifdef DEBUG
printf("Screen Mode:\n");
printf("------------\n");
printf("Width : %d\n", gsGlobal->Width);
printf("Height: %d\n", gsGlobal->Height);
printf("StartX: %d\n", gsGlobal->StartX);
printf("StartY: %d\n", gsGlobal->StartY);
printf("MagH : %d\n", gsGlobal->MagH);
printf("MagV : %d\n", gsGlobal->MagV);
printf("DW : %d\n", gsGlobal->DW);
printf("DH : %d\n", gsGlobal->DH);
#endif
GS_RESET();
__asm__("sync.p; nop;");
*GS_CSR = 0x00000000; // Clean CSR registers
GsPutIMR(0x0000F700); // Unmasks all of the GS interrupts
SetGsCrt(gsGlobal->Interlace, gsGlobal->Mode, gsGlobal->Field);
gsGlobal->FirstFrame = GS_SETTING_ON;
if(gsGlobal->ZBuffering == GS_SETTING_OFF)
{
gsGlobal->Test->ZTE = GS_SETTING_ON;
gsGlobal->Test->ZTST = 1;
}
DIntr(); // disable interrupts
GS_SET_PMODE( 0, // Read Circuit 1
1, // Read Circuit 2
0, // Use ALP Register for Alpha Blending
1, // Alpha Value of Read Circuit 2 for Output Selection
0, // Blend Alpha with output of Read Circuit 2
0x80); // Alpha Value = 1.0
GS_SET_DISPFB1( 0, // Frame Buffer Base Pointer (Address/2048)
gsGlobal->Width / 64, // Buffer Width (Address/64)
gsGlobal->PSM, // Pixel Storage Format
0, // Upper Left X in Buffer
0);
GS_SET_DISPFB2( 0, // Frame Buffer Base Pointer (Address/2048)
gsGlobal->Width / 64, // Buffer Width (Address/64)
gsGlobal->PSM, // Pixel Storage Format
0, // Upper Left X in Buffer
0); // Upper Left Y in Buffer
GS_SET_DISPLAY1(gsGlobal->StartX, // X position in the display area (in VCK unit
gsGlobal->StartY, // Y position in the display area (in Raster u
gsGlobal->MagH, // Horizontal Magnification
gsGlobal->MagV, // Vertical Magnification
gsGlobal->DW - 1, // Display area width
gsGlobal->DH - 1); // Display area height
GS_SET_DISPLAY2(gsGlobal->StartX, // X position in the display area (in VCK units)
gsGlobal->StartY, // Y position in the display area (in Raster units)
gsGlobal->MagH, // Horizontal Magnification
gsGlobal->MagV, // Vertical Magnification
gsGlobal->DW - 1, // Display area width
gsGlobal->DH - 1); // Display area height
GS_SET_BGCOLOR( gsGlobal->BGColor->Red, // Red
gsGlobal->BGColor->Green, // Green
gsGlobal->BGColor->Blue); // Blue
EIntr(); //enable interrupts
gsGlobal->CurrentPointer = 0; // reset vram pointer too
// Context 1
gsGlobal->ScreenBuffer[0] = gsKit_vram_alloc( gsGlobal, gsKit_texture_size(gsGlobal->Width, gsGlobal->Height, gsGlobal->PSM), GSKIT_ALLOC_SYSBUFFER );
if(gsGlobal->DoubleBuffering == GS_SETTING_OFF)
{
gsGlobal->ScreenBuffer[1] = gsGlobal->ScreenBuffer[0];
}
else
// Context 2
gsGlobal->ScreenBuffer[1] = gsKit_vram_alloc( gsGlobal, gsKit_texture_size(gsGlobal->Width, gsGlobal->Height, gsGlobal->PSM), GSKIT_ALLOC_SYSBUFFER );
if(gsGlobal->ZBuffering == GS_SETTING_ON)
gsGlobal->ZBuffer = gsKit_vram_alloc( gsGlobal, gsKit_texture_size(gsGlobal->Width, gsGlobal->Height, gsGlobal->PSMZ), GSKIT_ALLOC_SYSBUFFER ); // Z Buffer
gsGlobal->TexturePointer = gsGlobal->CurrentPointer; // first useable address for textures
p_data = p_store = (u64 *)gsGlobal->dma_misc;
*p_data++ = GIF_TAG( size - 1, 1, 0, 0, 0, 1 );
*p_data++ = GIF_AD;
*p_data++ = 1;
*p_data++ = GS_PRMODECONT;
*p_data++ = GS_SETREG_FRAME_1( gsGlobal->ScreenBuffer[0], gsGlobal->Width / 64, gsGlobal->PSM, 0 );
*p_data++ = GS_FRAME_1;
*p_data++ = GS_SETREG_XYOFFSET_1( gsGlobal->OffsetX,
gsGlobal->OffsetY);
*p_data++ = GS_XYOFFSET_1;
*p_data++ = GS_SETREG_SCISSOR_1( 0, gsGlobal->Width - 1, 0, gsGlobal->Height - 1 );
*p_data++ = GS_SCISSOR_1;
*p_data++ = GS_SETREG_TEST( gsGlobal->Test->ATE, gsGlobal->Test->ATST,
gsGlobal->Test->AREF, gsGlobal->Test->AFAIL,
gsGlobal->Test->DATE, gsGlobal->Test->DATM,
gsGlobal->Test->ZTE, gsGlobal->Test->ZTST );
*p_data++ = GS_TEST_1;
*p_data++ = GS_SETREG_CLAMP(gsGlobal->Clamp->WMS, gsGlobal->Clamp->WMT,
gsGlobal->Clamp->MINU, gsGlobal->Clamp->MAXU,
gsGlobal->Clamp->MINV, gsGlobal->Clamp->MAXV);
*p_data++ = GS_CLAMP_1;
if(gsGlobal->ZBuffering == GS_SETTING_ON)
{
if((gsGlobal->PSM == GS_PSM_CT16) && (gsGlobal->PSMZ != GS_PSMZ_16))
gsGlobal->PSMZ = GS_PSMZ_16; // seems only non-S 16-bit z depth works with this mode
if((gsGlobal->PSM != GS_PSM_CT16) && (gsGlobal->PSMZ == GS_PSMZ_16))
gsGlobal->PSMZ = GS_PSMZ_16S; // other depths don't seem to work with 16-bit non-S z depth
*p_data++ = GS_SETREG_ZBUF_1( gsGlobal->ZBuffer / 8192, gsGlobal->PSMZ, 0 );
*p_data++ = GS_ZBUF_1;
}
if(gsGlobal->ZBuffering == GS_SETTING_OFF)
{
*p_data++ = GS_SETREG_ZBUF_1( NULL, gsGlobal->PSM, 1 );
*p_data++ = GS_ZBUF_1;
}
*p_data++ = GS_SETREG_COLCLAMP( 255 );
*p_data++ = GS_COLCLAMP;
*p_data++ = GS_SETREG_FRAME_1( gsGlobal->ScreenBuffer[1], gsGlobal->Width / 64, gsGlobal->PSM, 0 );
*p_data++ = GS_FRAME_2;
*p_data++ = GS_SETREG_XYOFFSET_1( gsGlobal->OffsetX,
gsGlobal->OffsetY);
*p_data++ = GS_XYOFFSET_2;
*p_data++ = GS_SETREG_SCISSOR_1( 0, gsGlobal->Width - 1, 0, gsGlobal->Height - 1);
*p_data++ = GS_SCISSOR_2;
*p_data++ = GS_SETREG_TEST( gsGlobal->Test->ATE, gsGlobal->Test->ATST,
gsGlobal->Test->AREF, gsGlobal->Test->AFAIL,
gsGlobal->Test->DATE, gsGlobal->Test->DATM,
gsGlobal->Test->ZTE, gsGlobal->Test->ZTST );
*p_data++ = GS_TEST_2;
*p_data++ = GS_SETREG_CLAMP(gsGlobal->Clamp->WMS, gsGlobal->Clamp->WMT,
gsGlobal->Clamp->MINU, gsGlobal->Clamp->MAXU,
gsGlobal->Clamp->MINV, gsGlobal->Clamp->MAXV);
*p_data++ = GS_CLAMP_2;
if(gsGlobal->ZBuffering == GS_SETTING_ON)
{
*p_data++ = GS_SETREG_ZBUF_1( gsGlobal->ZBuffer / 8192, gsGlobal->PSMZ, 0 );
*p_data++ = GS_ZBUF_2;
}
if(gsGlobal->ZBuffering == GS_SETTING_OFF)
{
*p_data++ = GS_SETREG_ZBUF_1( NULL, gsGlobal->PSM, 1 );
*p_data++ = GS_ZBUF_2;
}
*p_data++ = GS_BLEND_BACK2FRONT;
*p_data++ = GS_ALPHA_1;
*p_data++ = GS_BLEND_BACK2FRONT;
*p_data++ = GS_ALPHA_2;
*p_data++ = GS_SETREG_DIMX(gsGlobal->DitherMatrix[0],gsGlobal->DitherMatrix[1],
gsGlobal->DitherMatrix[2],gsGlobal->DitherMatrix[3],gsGlobal->DitherMatrix[4],
gsGlobal->DitherMatrix[5],gsGlobal->DitherMatrix[6],gsGlobal->DitherMatrix[7],
gsGlobal->DitherMatrix[8],gsGlobal->DitherMatrix[9],gsGlobal->DitherMatrix[10],
gsGlobal->DitherMatrix[11],gsGlobal->DitherMatrix[12],gsGlobal->DitherMatrix[13],
gsGlobal->DitherMatrix[14],gsGlobal->DitherMatrix[15]); // 4x4 dither matrix
*p_data++ = GS_DIMX;
if((gsGlobal->Dithering == GS_SETTING_ON) && ((gsGlobal->PSM == GS_PSM_CT16) || (gsGlobal->PSM == GS_PSM_CT16S))) {
*p_data++ = 1;
*p_data++ = GS_DTHE;
}
dmaKit_send_ucab(DMA_CHANNEL_GIF, p_store, size);
dmaKit_wait_fast();
// do a single frame here to get rid whatever needs to be done during the first frame
gsKit_clear(gsGlobal, GS_SETREG_RGBAQ(0x00,0x00,0x00,0x00,0x00)); // clear the screen
gsKit_queue_exec(gsGlobal);
gsKit_sync_flip(gsGlobal);
gsKit_queue_reset(gsGlobal->Os_Queue);
}
//---------------------------------------------------------------------------
int g2_init(g2_video_mode mode)
{
vmode_t *v;
v = &(vmodes[mode]);
cur_mode = v;
g2_max_x = v->width - 1;
g2_max_y = v->height - 1;
g2_view_x0 = 0;
g2_view_y0 = 0;
g2_view_x1 = g2_max_x;
g2_view_y1 = g2_max_y;
gs_origin_x = 1024;
gs_origin_y = 1024;
gs_mem_current = 0; // nothing allocated yet
g2_visible_frame = 0; // display frame 0
g2_active_frame = 0; // draw to frame 0
// - Initialize the DMA.
// - Writes a 0 to most of the DMA registers.
dma_reset();
// - Sets the RESET bit if the GS CSR register.
GS_RESET();
#ifndef FLASH
// - Can someone please tell me what the sync.p
// instruction does. Synchronizes something :-)
__asm__("
sync.p
nop
");
#endif
// - Sets up the GS IMR register (i guess).
// - The IMR register is used to mask and unmask certain interrupts,
// for example VSync and HSync. We'll use this properly in Tutorial 2.
// - Does anyone have code to do this without using the 0x71 syscall?
// - I havn't gotten around to looking at any PS2 bios code yet.
gs_set_imr();
// - Use syscall 0x02 to setup some video mode stuff.
// - Pretty self explanatory I think.
// - Does anyone have code to do this without using the syscall? It looks
// like it should only set the SMODE2 register, but if I remove this syscall
// and set the SMODE2 register myself, it donesn't work. What else does
// syscall 0x02 do?
gs_set_crtc(NON_INTERLACED, v->ntsc_pal, FRAME);
// - I havn't attempted to understand what the Alpha parameters can do. They
// have been blindly copied from the 3stars demo (although they don't seem
// do have any impact in this simple 2D code.
GS_SET_PMODE(
0, // ReadCircuit1 OFF
1, // ReadCircuit2 ON
1, // Use ALP register for Alpha Blending
1, // Alpha Value of ReadCircuit2 for output selection
0, // Blend Alpha with the output of ReadCircuit2
0xFF // Alpha Value = 1.0
);
/*
// - Non needed if we use gs_set_crt()
GS_SET_SMODE2(
0, // Non-Interlaced mode
1, // FRAME mode (read every line)
0 // VESA DPMS Mode = ON ??? please explain ???
);
*/
GS_SET_DISPFB2(
0, // Frame Buffer base pointer = 0 (Address/8192)
v->width/64, // Buffer Width (Pixels/64)
v->psm, // Pixel Storage Format
0, // Upper Left X in Buffer = 0
0 // Upper Left Y in Buffer = 0
);
// Why doesn't (0, 0) equal the very top-left of the TV?
GS_SET_DISPLAY2(
656, // X position in the display area (in VCK units)
36, // Y position in the display area (in Raster units)
v->magh-1, // Horizontal Magnification - 1
0, // Vertical Magnification = 1x
v->width*v->magh-1, // Display area width - 1 (in VCK units) (Width*HMag-1)
v->height-1 // Display area height - 1 (in pixels) (Height-1)
);
GS_SET_BGCOLOR(
0, // RED
0, // GREEN
0 // BLUE
);
BEGIN_GS_PACKET(gs_dma_buf);
GIF_TAG_AD(gs_dma_buf, 6, 1, 0, 0, 0);
// Use drawing parameters from PRIM register
GIF_DATA_AD(gs_dma_buf, prmodecont, 1);
// Setup frame buffers. Point to 0 initially.
GIF_DATA_AD(gs_dma_buf, frame_1,
GS_FRAME(
0, // FrameBuffer base pointer = 0 (Address/8192)
v->width/64, // Frame buffer width (Pixels/64)
v->psm, // Pixel Storage Format
0));
// Save address and advance GS memory pointer by buffer size (in bytes)
// Do this for both frame buffers.
g2_frame_addr[0] = gs_mem_current;
gs_mem_current += v->width * v->height * (v->bpp/8);
g2_frame_addr[1] = gs_mem_current;
gs_mem_current += v->width * v->height * (v->bpp/8);
// Displacement between Primitive and Window coordinate systems.
GIF_DATA_AD(gs_dma_buf, xyoffset_1,
GS_XYOFFSET(
gs_origin_x<<4,
gs_origin_y<<4));
// Clip to frame buffer.
GIF_DATA_AD(gs_dma_buf, scissor_1,
GS_SCISSOR(
0,
g2_max_x,
0,
g2_max_y));
// Create a single 256x128 font buffer
g2_fontbuf_addr = gs_mem_current;
gs_mem_current += g2_fontbuf_w * g2_fontbuf_h * (v->bpp/8);
// Create a texture buffer as big as the screen.
// Just save the address advance GS memory pointer by buffer size (in bytes)
// The TEX registers are set later, when drawing.
g2_texbuf_addr = gs_mem_current;
gs_mem_current += v->width * v->height * (v->bpp/8);
// Setup test_1 register to allow transparent texture regions where A=0
GIF_DATA_AD(gs_dma_buf, test_1,
GS_TEST(
1, // Alpha Test ON
ATST_NOTEQUAL, 0x00, // Reject pixels with A=0
AFAIL_KEEP, // Don't update frame or Z buffers
0, 0, 0, 0)); // No Destination Alpha or Z-Buffer Tests
// Setup the ALPHA_1 register to correctly blend edges of
// pre-antialiased fonts using Alpha Blending stage.
// The blending formula is
// PIXEL=(SRC-FRAME)*SRC_ALPHA>>7+FRAME
GIF_DATA_AD(gs_dma_buf, alpha_1,
GS_ALPHA(
0, // A - source
1, // B - frame buffer
0, // C - alpha from source
1, // D - frame buffer
0)); // FIX - not needed
SEND_GS_PACKET(gs_dma_buf);
return(1);
}
