cross-primitive-mask.c

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/*
 
MIT License
 
Copyright (c) 2026 PCSX-Redux authors
 
Permission is hereby granted, free of charge, to any person obtaining a copy
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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*/
 
// Mask-bit set + check behavior across PRIMITIVE TYPES. Phase-2 only
// tested triangles; this suite extends to rectangles, lines, textured
// rectangles, and textured triangles at all three depths. Each
// primitive type goes through its own writer code path in the soft
// renderer, and the audit (writer-policy refactor track) treats mask
// behavior as embedded in writers rather than templated. Cross-
// primitive coverage matters for the refactor.
//
// Pattern: pass 1 draws with set-mask (E6=0x01), expecting pixels to
// land with bit 15 forced. Pass 2 with check-mask (E6=0x02) overlays
// a second primitive; pixels with bit 15 set should be preserved,
// pixels with bit 15 clear (or sentinel) should be overwritten.
//
// Local sentinel 0x5555 (bit 15 clear) - same workaround as phase-2.
 
#define MASK_SUITE_SENTINEL  0x5555u
 
CESTER_BODY(
 
static void fillSuiteRegion(int16_t x, int16_t y, int16_t w, int16_t h) {
    rasterFillRect(x, y, w, h, MASK_SUITE_SENTINEL);
}
 
// -- Rectangle (GP0 0x60) --
 
static void drawRectSet(void) {
    rasterReset();
    fillSuiteRegion(0, 0, 16, 8);
    sendGPUData(0xe6000001u);
    /* 4x4 RED rect at (0,0). */
    rasterFlatRect(RASTER_CMD_RED, 0, 0, 4, 4);
    rasterFlushPrimitive();
    sendGPUData(0xe6000000u);
}
 
static void drawRectSetThenCheck(void) {
    rasterReset();
    fillSuiteRegion(0, 0, 16, 8);
    /* Pass 1: RED rect (0,0,4,4) with set-mask. */
    sendGPUData(0xe6000001u);
    rasterFlatRect(RASTER_CMD_RED, 0, 0, 4, 4);
    rasterFlushPrimitive();
    /* Pass 2: GREEN rect (2,0,6,4) with check-mask. Overlap region
       (2..3, 0..3) should be preserved RED-with-mask. Non-overlap
       (4..7, 0..3) should fill GREEN. */
    sendGPUData(0xe6000002u);
    rasterFlatRect(RASTER_CMD_GREEN, 2, 0, 6, 4);
    rasterFlushPrimitive();
    sendGPUData(0xe6000000u);
}
 
// -- Line (GP0 0x40) --
 
static void drawLineSet(void) {
    rasterReset();
    fillSuiteRegion(0, 0, 16, 4);
    sendGPUData(0xe6000001u);
    /* Horizontal RED line from (0,0) to (5,0). */
    rasterFlatLine(RASTER_CMD_RED, 0, 0, 5, 0);
    rasterFlushPrimitive();
    sendGPUData(0xe6000000u);
}
 
static void drawLineSetThenCheck(void) {
    rasterReset();
    fillSuiteRegion(0, 0, 16, 4);
    sendGPUData(0xe6000001u);
    rasterFlatLine(RASTER_CMD_RED, 0, 0, 5, 0);
    rasterFlushPrimitive();
    sendGPUData(0xe6000002u);
    /* Overlay GREEN line (3,0)-(8,0). Overlap pixels (3..5) preserved,
       new pixels (6..8) filled GREEN. */
    rasterFlatLine(RASTER_CMD_GREEN, 3, 0, 8, 0);
    rasterFlushPrimitive();
    sendGPUData(0xe6000000u);
}
 
// -- Textured rectangle (GP0 0x64) - 4-bit CLUT --
 
// GP0(0x64) variable-size textured rectangle. Word layout:
//   word 0: 0x64xxxxxx (24-bit modulation color)
//   word 1: y << 16 | x   (top-left corner)
//   word 2: clut << 16 | (v0 << 8) | u0   (UV at top-left + CLUT)
//   word 3: h << 16 | w   (size)
//
// Texpage state comes from the LAST GP0(E1), not embedded in the
// command. So setTexpage() must precede the draw.
static inline void rasterFlatTexRect(uint32_t cmdColor, int16_t x, int16_t y,
                                     int16_t w, int16_t h, uint8_t u0,
                                     uint8_t v0, uint16_t clut_field) {
    waitGPU();
    GPU_DATA = 0x64000000u | (cmdColor & 0x00ffffffu);
    GPU_DATA = ((uint32_t)(uint16_t)y << 16) | (uint32_t)(uint16_t)x;
    GPU_DATA = ((uint32_t)clut_field << 16) |
               ((uint32_t)v0 << 8) | (uint32_t)u0;
    GPU_DATA = ((uint32_t)(uint16_t)h << 16) | (uint32_t)(uint16_t)w;
}
 
static void drawTexRect4Set(void) {
    rasterReset();
    fillSuiteRegion(0, 0, 16, 8);
    setTexpage(TEX4_TX, TEX4_TY, 0);
    setTextureWindow(0, 0, 0, 0);
    sendGPUData(0xe6000001u);
    /* 4x4 textured rect at (0,0) with UV (1,1)-(4,4) at 4-bit. */
    rasterFlatTexRect(TEX_MOD_NEUTRAL, 0, 0, 4, 4, 1, 1, CLUT4_FIELD);
    rasterFlushPrimitive();
    sendGPUData(0xe6000000u);
}
 
// -- Textured triangle (GP0 0x24) - 4-bit CLUT --
 
static void drawTexTri4Set(void) {
    rasterReset();
    fillSuiteRegion(0, 0, 16, 8);
    setTexpage(TEX4_TX, TEX4_TY, 0);
    setTextureWindow(0, 0, 0, 0);
    sendGPUData(0xe6000001u);
    /* 4-pixel triangle at (0,0)(4,0)(0,4) with UV matching. */
    rasterTexTri(TEX_MOD_NEUTRAL,
                 0, 0,   1, 1,
                 4, 0,   5, 1,
                 0, 4,   1, 5,
                 CLUT4_FIELD, TEX4_TPAGE);
    rasterFlushPrimitive();
    sendGPUData(0xe6000000u);
}
 
// -- Textured triangle (GP0 0x24) - 8-bit CLUT --
 
static void drawTexTri8Set(void) {
    rasterReset();
    fillSuiteRegion(0, 0, 16, 8);
    setTexpage(TEX8_TX, TEX8_TY, 1);
    setTextureWindow(0, 0, 0, 0);
    sendGPUData(0xe6000001u);
    rasterTexTri(TEX_MOD_NEUTRAL,
                 0, 0,   1, 1,
                 4, 0,   5, 1,
                 0, 4,   1, 5,
                 CLUT8_FIELD, TEX8_TPAGE);
    rasterFlushPrimitive();
    sendGPUData(0xe6000000u);
}
 
// -- Textured triangle (GP0 0x24) - 15-bit direct --
 
static void drawTexTri15Set(void) {
    rasterReset();
    fillSuiteRegion(0, 0, 16, 8);
    setTexpage(TEX15_TX, TEX15_TY, 2);
    setTextureWindow(0, 0, 0, 0);
    sendGPUData(0xe6000001u);
    rasterTexTri(TEX_MOD_NEUTRAL,
                 0, 0,   1, 1,
                 4, 0,   5, 1,
                 0, 4,   1, 5,
                 CLUT15_FIELD, TEX15_TPAGE);
    rasterFlushPrimitive();
    sendGPUData(0xe6000000u);
}
 
)  // CESTER_BODY
 
// --------------------------------------------------------------------------
// Rectangle mask-bit
// --------------------------------------------------------------------------
 
CESTER_TEST(rect_mask_set_origin_has_bit15, gpu_raster_phase5,
    drawRectSet();
    /* (0,0) drawn RED with mask -> 0x801f. */
    ASSERT_PIXEL_EQ(0x801fu, 0, 0);
)
 
CESTER_TEST(rect_mask_set_interior_has_bit15, gpu_raster_phase5,
    drawRectSet();
    ASSERT_PIXEL_EQ(0x801fu, 2, 2);
)
 
CESTER_TEST(rect_mask_set_right_edge_excluded, gpu_raster_phase5,
    drawRectSet();
    ASSERT_PIXEL_EQ((unsigned)MASK_SUITE_SENTINEL, 4, 0);
)
 
CESTER_TEST(rect_mask_check_preserves_red_in_overlap, gpu_raster_phase5,
    drawRectSetThenCheck();
    /* (2, 0) in both rects. RED mask-set written first, GREEN
       check-mask should skip. Expect 0x801f preserved. */
    ASSERT_PIXEL_EQ(0x801fu, 2, 0);
)
 
CESTER_TEST(rect_mask_check_fills_green_in_non_overlap, gpu_raster_phase5,
    drawRectSetThenCheck();
    /* (6, 0) only in GREEN rect, sentinel before, mask bit clear,
       should fill GREEN. */
    ASSERT_PIXEL_EQ(RASTER_VRAM_GREEN, 6, 0);
)
 
CESTER_TEST(rect_mask_check_red_untouched_left, gpu_raster_phase5,
    drawRectSetThenCheck();
    /* (0, 0) RED-mask only (not in GREEN overlap). Stays 0x801f. */
    ASSERT_PIXEL_EQ(0x801fu, 0, 0);
)
 
// --------------------------------------------------------------------------
// Line mask-bit
// --------------------------------------------------------------------------
 
CESTER_TEST(line_mask_set_start_has_bit15, gpu_raster_phase5,
    drawLineSet();
    ASSERT_PIXEL_EQ(0x801fu, 0, 0);
)
 
CESTER_TEST(line_mask_set_mid_has_bit15, gpu_raster_phase5,
    drawLineSet();
    ASSERT_PIXEL_EQ(0x801fu, 3, 0);
)
 
CESTER_TEST(line_mask_set_end_inclusive, gpu_raster_phase5,
    drawLineSet();
    /* PSX lines are endpoint-inclusive (verified phase-2). */
    ASSERT_PIXEL_EQ(0x801fu, 5, 0);
)
 
CESTER_TEST(line_mask_check_preserves_overlap, gpu_raster_phase5,
    drawLineSetThenCheck();
    ASSERT_PIXEL_EQ(0x801fu, 4, 0);
)
 
CESTER_TEST(line_mask_check_fills_new_pixel, gpu_raster_phase5,
    drawLineSetThenCheck();
    ASSERT_PIXEL_EQ(RASTER_VRAM_GREEN, 7, 0);
)
 
// --------------------------------------------------------------------------
// Textured rectangle mask-bit (4-bit CLUT)
// --------------------------------------------------------------------------
 
CESTER_TEST(texrect4_mask_set_origin_has_bit15, gpu_raster_phase5,
    drawTexRect4Set();
    /* (0,0) of textured rect samples UV (1,1) -> CLUT[1] from 4-bit
       fixture = vram555(1, 30, 0) = 0x03C1, with mask bit forced:
       0x83C1. */
    uint16_t expected = (uint16_t)(expectedClut4Color(1) | 0x8000);
    ASSERT_PIXEL_EQ(expected, 0, 0);
)
 
CESTER_TEST(texrect4_mask_set_interior_has_bit15, gpu_raster_phase5,
    drawTexRect4Set();
    /* (2,2) of rect samples UV (3,3) -> CLUT[3] | 0x8000. */
    uint16_t expected = (uint16_t)(expectedClut4Color(3) | 0x8000);
    ASSERT_PIXEL_EQ(expected, 2, 2);
)
 
CESTER_TEST(texrect4_mask_set_right_edge_excluded, gpu_raster_phase5,
    drawTexRect4Set();
    ASSERT_PIXEL_EQ((unsigned)MASK_SUITE_SENTINEL, 4, 0);
)
 
// --------------------------------------------------------------------------
// Textured triangle mask-bit at all three depths
// --------------------------------------------------------------------------
 
CESTER_TEST(textri4_mask_set_origin, gpu_raster_phase5,
    drawTexTri4Set();
    /* At screen (0,0), UV (1,1), CLUT[1] | 0x8000. */
    uint16_t expected = (uint16_t)(expectedClut4Color(1) | 0x8000);
    ASSERT_PIXEL_EQ(expected, 0, 0);
)
 
CESTER_TEST(textri4_mask_set_interior, gpu_raster_phase5,
    drawTexTri4Set();
    uint16_t expected = (uint16_t)(expectedClut4Color(2) | 0x8000);
    ASSERT_PIXEL_EQ(expected, 1, 1);
)
 
CESTER_TEST(textri4_mask_set_right_edge_excluded, gpu_raster_phase5,
    drawTexTri4Set();
    ASSERT_PIXEL_EQ((unsigned)MASK_SUITE_SENTINEL, 4, 0);
)
 
CESTER_TEST(textri8_mask_set_origin, gpu_raster_phase5,
    drawTexTri8Set();
    uint16_t expected = (uint16_t)(expectedClut8Color(1) | 0x8000);
    ASSERT_PIXEL_EQ(expected, 0, 0);
)
 
CESTER_TEST(textri8_mask_set_interior, gpu_raster_phase5,
    drawTexTri8Set();
    uint16_t expected = (uint16_t)(expectedClut8Color(2) | 0x8000);
    ASSERT_PIXEL_EQ(expected, 1, 1);
)
 
CESTER_TEST(textri15_mask_set_origin, gpu_raster_phase5,
    drawTexTri15Set();
    /* 15-bit direct: texel at UV (1,1) is vram555(1, 1, 2) | 0x8000. */
    uint16_t expected = (uint16_t)(expectedTex15Color(1, 1) | 0x8000);
    ASSERT_PIXEL_EQ(expected, 0, 0);
)
 
CESTER_TEST(textri15_mask_set_interior, gpu_raster_phase5,
    drawTexTri15Set();
    uint16_t expected = (uint16_t)(expectedTex15Color(2, 2) | 0x8000);
    ASSERT_PIXEL_EQ(expected, 1, 1);
)
 
CESTER_TEST(textri15_mask_set_right_edge_excluded, gpu_raster_phase5,
    drawTexTri15Set();
    ASSERT_PIXEL_EQ((unsigned)MASK_SUITE_SENTINEL, 4, 0);
)