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PS2: Broken rendering, but it does look nicer before it breaks

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This commit is contained in:
UnknownShadow200 2023-11-30 21:50:02 +11:00
parent ce6a8d2516
commit 6aa3289826
1 changed files with 64 additions and 15 deletions
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79
src/Graphics_PS2.c
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@ -84,6 +84,22 @@ static qword_t* SetTextureSampling(qword_t* q, int context) {
return q;
}
static qword_t* SetAlphaBlending(qword_t* q, int context) {
PACK_GIFTAG(q, GIF_SET_TAG(1,0,0,0, GIF_FLG_PACKED, 1), GIF_REG_AD);
q++;
// https://psi-rockin.github.io/ps2tek/#gsalphablending
// Output = (((A - B) * C) >> 7) + D
// = (((src - dst) * alpha) >> 7) + dst
// = (src * alpha - dst * alpha) / 128 + dst
// = (src * alpha - dst * alpha) / 128 + dst * 128 / 128
// = ((src * alpha + dst * (128 - alpha)) / 128
PACK_GIFTAG(q, GS_SET_ALPHA(BLEND_COLOR_SOURCE, BLEND_COLOR_DEST, BLEND_ALPHA_SOURCE,
BLEND_COLOR_DEST, 0x80), GS_REG_ALPHA + context);
q++;
return q;
}
static void InitDrawingEnv(void) {
packet_t *packet = packet_init(30, PACKET_NORMAL); // TODO: is 30 too much?
qword_t *q = packet->data;
@ -94,6 +110,7 @@ static void InitDrawingEnv(void) {
q = SetTextureWrapping(q, 0);
q = SetTextureSampling(q, 0);
q = SetAlphaBlending(q, 0); // TODO has no effect ?
q = draw_finish(q);
dma_channel_send_normal(DMA_CHANNEL_GIF,packet->data,q - packet->data, 0, 0);
@ -130,8 +147,9 @@ void Gfx_Create(void) {
context = 1;
FlipContext();
Gfx.MaxTexWidth = 512;
Gfx.MaxTexHeight = 512;
Gfx.MaxTexWidth = 1024;
Gfx.MaxTexHeight = 1024;
Gfx.MaxTexSize = 512 * 512;
Gfx.Created = true;
Gfx_RestoreState();
@ -434,9 +452,33 @@ void Gfx_SetVertexFormat(VertexFormat fmt) {
typedef struct Vector4 { float X, Y, Z, W; } Vector4;
static cc_bool NotClipped(Vector4 pos) {
// The code below clips to the viewport clip planes
// For e.g. X this is [2048 - vp_width / 2, 2048 + vp_width / 2]
// However the guard band itself ranges from 0 to 4096
// To reduce need to clip, clip against guard band on X/Y axes instead
/*return
xAdj >= -pos.W && xAdj <= pos.W &&
yAdj >= -pos.W && yAdj <= pos.W &&
pos.Z >= -pos.W && pos.Z <= pos.W;*/
// Rescale clip planes to guard band extent:
// X/W * vp_hwidth <= vp_hwidth -- clipping against viewport
// X/W <= 1
// X <= W
// X/W * vp_hwidth <= 2048 -- clipping against guard band
// X/W <= 2048 / vp_hwidth
// X * vp_hwidth / 2048 <= W
float xAdj = pos.X * (vp_hwidth/2048);
float yAdj = pos.Y * (vp_hheight/2048);
// X/W * vp_hwidth <= 2048
//
// Clip X/Y to INSIDE the guard band regions
// NOTE: This seems to result in lockup at end of frame
return
pos.X >= -pos.W && pos.X <= pos.W &&
pos.Y >= -pos.W && pos.Y <= pos.W &&
xAdj > -pos.W && xAdj < pos.W &&
yAdj > -pos.W && yAdj < pos.W &&
pos.Z >= -pos.W && pos.Z <= pos.W;
}
@ -449,27 +491,33 @@ static Vector4 TransformVertex(struct VertexTextured* pos) {
return coord;
}
#define VCopy(dst, src) dst.x = (vp_hwidth/2048) * (src.X / src.W); dst.y = (vp_hheight/2048) * (src.Y / src.W); dst.z = src.Z / src.W; dst.w = src.W;
//#define VCopy(dst, src) dst.x = vp_hwidth * (1 + src.X / src.W); dst.y = vp_hheight * (1 - src.Y / src.W); dst.z = src.Z / src.W; dst.w = src.W;
static xyz_t FinishVertex(struct Vector4 src) {
float x = (vp_hwidth/2048) * (src.X / src.W);
float y = (vp_hheight/2048) * (src.Y / src.W);
float z = src.Z / src.W;
int originX = ftoi4(2048);
int originY = ftoi4(2048);
unsigned int maxZ = 1 << (32 - 1); // TODO: half this? or << 24 instead?
xyz_t xyz;
xyz.x = (short)((x + 1.0f) * originX);
xyz.y = (short)((y + 1.0f) * -originY);
xyz.z = (unsigned int)((z + 1.0f) * maxZ);
return xyz;
}
static void DrawTriangle(Vector4 v0, Vector4 v1, Vector4 v2, struct VertexTextured* V0, struct VertexTextured* V1, struct VertexTextured* V2) {
vertex_f_t in_vertices[3];
//Platform_Log4("X: %f3, Y: %f3, Z: %f3, W: %f3", &v0.X, &v0.Y, &v0.Z, &v0.W);
xyz_t out_vertices[3];
u64* dw;
VCopy(in_vertices[0], v0);
VCopy(in_vertices[1], v1);
VCopy(in_vertices[2], v2);
Vector4 verts[3] = { v0, v1, v2 };
struct VertexTextured* v[] = { V0, V1, V2 };
cc_bool texturing = gfx_format == VERTEX_FORMAT_TEXTURED;
//Platform_Log4(" X: %f3, Y: %f3, Z: %f3, W: %f3", &in_vertices[0].x, &in_vertices[0].y, &in_vertices[0].z, &in_vertices[0].w);
draw_convert_xyz(out_vertices, 2048, 2048, 32, 3, in_vertices);
PACK_GIFTAG(q, GIF_SET_TAG(1,0,0,0, GIF_FLG_PACKED, 1), GIF_REG_AD);
q++;
PACK_GIFTAG(q, GS_SET_PRIM(PRIM_TRIANGLE, PRIM_SHADE_GOURAUD, texturing, DRAW_DISABLE,
@ -487,7 +535,8 @@ static void DrawTriangle(Vector4 v0, Vector4 v1, Vector4 v2, struct VertexTextur
dw = (u64*)q;
for (int i = 0; i < 3; i++)
{
float Q = 1.0f / verts[i].W;
float Q = 1.0f / verts[i].W;
xyz_t xyz = FinishVertex(verts[i]);
color_t color;
texel_t texel;
@ -498,7 +547,7 @@ static void DrawTriangle(Vector4 v0, Vector4 v1, Vector4 v2, struct VertexTextur
*dw++ = color.rgbaq;
*dw++ = texel.uv;
*dw++ = out_vertices[i].xyz;
*dw++ = xyz.xyz;
}
dw++; // one more to even out number of doublewords
q = dw;