vault backup: 2025-04-20 13:20:44

.obsidian/workspace.json

@@ -41,12 +41,12 @@
             "state": {
               "type": "markdown",
               "state": {
-                "file": "PERSONAL PROJECTS/PS1 DOCS/PSX code - Load texture from SECTOR!.md",
+                "file": "PERSONAL PROJECTS/PS1 DOCS/PSX code logo show.md",
                 "mode": "source",
                 "source": false
               },
               "icon": "lucide-file",
-              "title": "PSX code - Load texture from SECTOR!"
+              "title": "PSX code logo show"
             }
           }
         ],
@@ -207,6 +207,8 @@
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+    "PERSONAL PROJECTS/PS1 DOCS/PSX code - Load texture from SECTOR!.md",
+    "PERSONAL PROJECTS/PS1 DOCS/PSX code logo show.md",
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     "PERSONAL PROJECTS/PS1 DOCS/PS1 Gamepad.md",
     "PERSONAL PROJECTS/P2EP/pseudoCode/FUN_800453e0 SystemEventManager.md",
@@ -230,14 +232,12 @@
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     "PERSONAL PROJECTS/PS1 DOCS/PSX code - Texture show from file.md",
     "PERSONAL PROJECTS/PS1 DOCS/PSX code - modules load and exec.md",
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     "PERSONAL PROJECTS/PS1 DOCS/PS1 DMA CD-ROM.md",
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     "WORK & PROJECTS/Mol/Документы для ТЗ ЛИМС/СМК",
-    "WORK & PROJECTS/Mol/Планы и диаграммы/Разработка - ЭПИКИ.md",
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PERSONAL PROJECTS/PS1 DOCS/PSX code logo show.md

@@ -0,0 +1,149 @@
+
+Here's the rewritten code with detailed English comments, following PlayStation 1 (PS1) hardware constraints and PsyQ SDK best practices:
+
+---
+
+### 1. `RDLogo_DrawFramePadCheck()` - Renders Frame and Handles Pad Input
+```c
+#include <sys/types.h>
+#include <psxgpu.h>
+#include <psxpad.h>
+
+/**
+ * Renders logo frame and checks controller input
+ * 
+ * @param isCheckPadBtn If 1, checks for button press to skip animation
+ * @return 1 if button pressed (and isCheckPadBtn=1), otherwise 0
+ */
+int RDLogo_DrawFramePadCheck(int isCheckPadBtn) {
+    static int currentBuffer = 0;  // Double buffer index (0/1)
+    PADTYPE padStatus;            // PS1 controller status struct
+    int padPressed = 0;           // Button press flag
+    
+    // (1) Get current buffer and set OT
+    currentBuffer = GsGetActiveBuff();
+    GsSetWorkBase((u_long*)&gpu_ot[currentBuffer]);  // Set OT for current buffer
+    
+    // (2) Clear ordering table for new frame
+    GsClearOt(0, 0, &gpu_ot[currentBuffer]);
+    
+    // (3) Add logo sprites to OT
+    // PS1 hardware limitation: Max sprite width = 256px, so logo is split
+    GsSortFastSprite(&leftLogoPart, &gpu_ot[currentBuffer], 0);  // Left 256px
+    GsSortFastSprite(&rightLogoPart, &gpu_ot[currentBuffer], 0); // Right 64px
+    
+    // (4) Wait for GPU and VBlank sync
+    DrawSync(0);                        // Wait for drawing completion
+    VSync(0);                           // Sync to vertical refresh
+    
+    // (5) Read controller input
+    PadRead(&padStatus);                // Poll controller
+    padPressed = (padStatus.btns != 0); // Any button pressed
+    
+    // (6) Skip input check or no button pressed
+    if ((isCheckPadBtn == 0) || (padPressed == 0)) {
+        GsSwapDispBuff();               // Flip buffers
+        GsSortClear(0, 0, 0, &gpu_ot[currentBuffer]);  // Clear screen
+        GsDrawOt(&gpu_ot[currentBuffer]); // Render OT
+        return 0;                       // No button pressed
+    }
+    
+    return 1;  // Button pressed (only if isCheckPadBtn=1)
+}
+```
+
+---
+
+### 2. `RDLogo_show()` - Main Logo Display Function
+```c
+#include <psxgpu.h>
+#include <psxcd.h>
+
+// Global sprite definitions (split due to PS1's 256px width limit)
+GsSPRITE leftLogoPart;  // Left 256px of logo (texture + attributes)
+GsSPRITE rightLogoPart; // Right 64px of logo (320px total width)
+u_long gpu_ot[2][OTSIZE]; // Double buffered ordering tables
+
+/**
+ * Displays logo with fade-in/out animation
+ * Splits rendering due to PS1 hardware limitations:
+ * - Maximum single sprite width: 256px
+ * - 15-bit color (RGB555)
+ * - Requires manual VRAM management
+ */
+void RDLogo_show(void) {
+    int alpha;  // Transparency value (0=transparent, 128=opaque)
+    int i;
+    
+    // (1) Initialize graphics
+    SetDispMask(0);                     // Disable display
+    ResetGraph(1);                      // Reset GPU
+    GsInitGraph(320, 240, 4, 1, 0);    // 320x240, 16-bit color
+    GsDefDispBuff(0, 0, 0, 240);       // Setup double buffering
+    
+    // (2) Load logo from CD-ROM
+    CdInit();                           // Initialize CD drive
+    // Read raw sector containing logo (bypass filesystem for speed)
+    CdRead(104798, (u_long*)&leftLogoPart, 2048);  // Sector 104798
+    
+    // (3) Configure split sprites
+    // Left part: 256px wide, positioned left of center (-160px)
+    GsSetSprite(&leftLogoPart, -160, -120, 256, 240, 5);  // Palette slot 5
+    // Right part: 64px wide, positioned right of center (+160px)
+    GsSetSprite(&rightLogoPart, 160, -120, 64, 240, 7);  // Palette slot 7
+    
+    // (4) Fade-in animation
+    for (alpha = 0; alpha < 128; alpha += 4) {
+        leftLogoPart.r = alpha;   // Set transparency (PS1 uses .r for blending)
+        rightLogoPart.r = alpha;
+        RDLogo_DrawFramePadCheck(0);  // Render without input check
+    }
+    
+    // (5) Display pause (120 frames) with skip option
+    for (i = 0; i < 120; i++) {
+        if (RDLogo_DrawFramePadCheck(1)) break;  // Check for button press
+    }
+    
+    // (6) Fade-out animation
+    for (alpha = 128; alpha >= 0; alpha -= 4) {
+        leftLogoPart.r = alpha;
+        rightLogoPart.r = alpha;
+        RDLogo_DrawFramePadCheck(0);
+    }
+    
+    SetDispMask(0);  // Disable display before exiting
+}
+```
+
+---
+
+### Key Hardware Considerations:
+1. **Sprite Width Limit**:
+   ```c
+   // PS1 GPU cannot render >256px wide sprites in one operation
+   GsSetSprite(&leftLogoPart, ..., 256, ...);  // Max allowed width
+   ```
+
+2. **VRAM Management**:
+   ```c
+   CdRead(104798, ...); // Bypass filesystem for direct sector access
+   ```
+
+3. **15-bit Color**:
+   ```c
+   GsInitGraph(..., 4, ...); // 4 = 16-bit color mode (RGB555)
+   ```
+
+4. **Ordering Table (OT)**:
+   ```c
+   GsClearOt(0, 0, &gpu_ot[currentBuffer]); // Critical for proper z-sorting
+   ```
+
+---
+
+### Compilation Notes:
+1. Requires PsyQ SDK (`libpsxgpu.a`, `libpsxcd.a`)
+2. Link with `-lpsxetc -lpsxgpu -lpsxcd`
+3. MIPS R3000 compiler needed (e.g., `mipsel-unknown-elf-gcc`)
+
+This implementation respects all PS1 hardware limitations while maintaining readability. The logo splitting is mandatory due to the GPU's 256px render width constraint.