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PS1: Water/Ice is rendered translucent

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UnknownShadow200 2025-02-01 09:03:06 +11:00
parent 21c612b975
commit eaef976993
2 changed files with 23 additions and 10 deletions
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7
misc/ps1/ps1defs.h
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@ -17,8 +17,14 @@ enum gpu_status_flags {
enum gp0_cmd_type {
GP0_CMD_CLEAR_VRAM_CACHE = 0x01000000,
GP0_CMD_TRANSFER_TO_VRAM = 0xA0000000,
GP0_CMD_POLYGON = 0x20000000,
};
enum gp0_polycmd_flags {
POLY_CMD_QUAD = 1u << 27,
POLY_CMD_TEXTURED = 1u << 26,
POLY_CMD_SEMITRNS = 1u << 25,
};
enum gp1_cmd_type {
GP1_CMD_DMA_MODE = 0x04000000,
@ -28,3 +34,4 @@ enum gp1_cmd_dma_mode {
GP1_DMA_NONE = 0,
GP1_DMA_CPU_TO_GP0 = 2,
};

26
src/Graphics_PS1.c
View File

@ -383,7 +383,13 @@ void Gfx_SetFaceCulling(cc_bool enabled) {
static void SetAlphaTest(cc_bool enabled) {
}
static uint32_t blend_mode;
static void SetAlphaBlend(cc_bool enabled) {
// NOTE: Semitransparent polygons are simply configured
// to draw all pixels as final_color = B/2 + F/2
// This works well enough for e.g. water and ice textures,
// but not for the UI - so it's only used in 3D mode
blend_mode = enabled ? POLY_CMD_SEMITRNS : 0;
}
void Gfx_SetAlphaArgBlend(cc_bool enabled) { }
@ -411,10 +417,9 @@ static void SetColorWrite(cc_bool r, cc_bool g, cc_bool b, cc_bool a) {
// TODO
}
static cc_bool depth_only;
void Gfx_DepthOnlyRendering(cc_bool depthOnly) {
cc_bool enabled = !depthOnly;
SetColorWrite(enabled & gfx_colorMask[0], enabled & gfx_colorMask[1],
enabled & gfx_colorMask[2], enabled & gfx_colorMask[3]);
depth_only = depthOnly;
}
@ -445,8 +450,8 @@ static void* gfx_vertices;
#define UVFixed(value) ((int)((value) * 1024.0f) & 0x3FF) // U/V wrapping not supported
#define POLY_CODE_F4 0x28
#define POLY_LEN_F4 5
#define POLY_CODE_F4 (GP0_CMD_POLYGON | POLY_CMD_QUAD)
#define POLY_LEN_F4 5
struct CC_POLY_F4 {
uint32_t tag;
uint32_t rgbc; // r0, g0, b0, code;
@ -456,8 +461,8 @@ struct CC_POLY_F4 {
int16_t x3, y3;
};
#define POLY_CODE_FT4 0x2C
#define POLY_LEN_FT4 9
#define POLY_CODE_FT4 (GP0_CMD_POLYGON | POLY_CMD_QUAD | POLY_CMD_TEXTURED)
#define POLY_LEN_FT4 9
struct CC_POLY_FT4 {
uint32_t tag;
uint32_t rgbc; // r0, g0, b0, code;
@ -515,7 +520,7 @@ static void PreprocessTexturedVertices(void) {
int R = PackedCol_R(src->Col) >> 1;
int G = PackedCol_G(src->Col) >> 1;
int B = PackedCol_B(src->Col) >> 1;
dst->rgbc = R | (G << 8) | (B << 16) | (POLY_CODE_FT4 << 24);
dst->rgbc = R | (G << 8) | (B << 16) | POLY_CODE_FT4;
}
}
@ -532,7 +537,7 @@ static void PreprocessColouredVertices(void) {
int R = PackedCol_R(src->Col);
int G = PackedCol_G(src->Col);
int B = PackedCol_B(src->Col);
dst->rgbc = R | (G << 8) | (B << 16) | (POLY_CODE_F4 << 24);
dst->rgbc = R | (G << 8) | (B << 16) | POLY_CODE_F4;
}
}
@ -951,7 +956,7 @@ static CC_INLINE void DrawTexturedQuad(struct PS1VertexTextured* v0, struct PS1V
if (!poly) return;
setlen(poly, POLY_LEN_FT4);
poly->rgbc = v0->rgbc;
poly->rgbc = v0->rgbc | blend_mode;
coord[0].vx = v0->x<<2; coord[0].vy = v0->y<<2; coord[0].vz = v0->z<<2;
coord[1].vx = v1->x<<2; coord[1].vy = v1->y<<2; coord[1].vz = v1->z<<2;
@ -1098,6 +1103,7 @@ void Gfx_DrawVb_IndexedTris(int verticesCount) {
}
void Gfx_DrawIndexedTris_T2fC4b(int verticesCount, int startVertex) {
if (depth_only) return;
DrawTexturedQuads3D(verticesCount, startVertex);
}