void CubeRenderer::beginShadow()
{
ZENIC_ASSERT(m_shadowModel);
if (!m_shadowModel)
return;
//m_renderer.beginRenderModels();
// Override the default gifchain with alpha enabled.
m_dmaChain.addSrcCntTag(VIF_STCYCL(1, 1), VIF_UNPACK(zenic::ps2::vif::V4_32, 1, 20));
m_dmaChain.add64(GIFTAG(0, 0, 1, GS_PRIM(gs::Tristrip, gs::Gouraud, gs::Texturing, 0, gs::Blend, 0, gs::Stq,
gs::Context1, 0), gif::Packed, 3));
m_dmaChain.add64(0x512);
m_dmaChain.endPacket();
// Set alpha
m_dmaChain.addSrcCntTag(0, VIF_DIRECT(2));
m_dmaChain.add128(GIFTAG(1, gif::Eop, 0, 0, gif::Packed, 1),gif::A_D);
m_dmaChain.add128(GS_ALPHA(1, 0, 2, 2, 0x80),GS_REG(ALPHA_1));
m_dmaChain.endPacket();
}
//---------------------------------------------------------------------------
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);
}
