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--- notes:comporg:spring2025:virconref [2025/02/27 16:29] – [OR] wedge
+++ notes:comporg:spring2025:virconref [2025/03/02 03:43] (current) – [GPU] tkastne1
@@ Line 167: / Line 167: @@
 ^  Type  ^  Port  ^  Name  ^  Description  |
 |  OUT  |  0x200  |  GPU_Command  |  perform GPU operation  |
-|  ???  |  0x201  |  GPU_RemainingPixels  |  ???  |
+|  IN  |  0x201  |  GPU_RemainingPixels  |  ???  |
+|  IN  |  0x202  |  GPU_ClearColor  |  obtain current clear color  |
 |  OUT  |  0x202  |  GPU_ClearColor  |  color to clear the screen with  |
-|  ???  |  0x203  |  GPU_MultiplyColor  |  ???  |
+|  IN  |  0x203  |  GPU_MultiplyColor  |  obtain current color multiplier  |
-|  ???  |  0x204  |  GPU_ActiveBlending  |  ???  |
+|  OUT  |  0x203  |  GPU_MultiplyColor  |  color multiplier to draw sprites with  |
+|  IN  |  0x204  |  GPU_ActiveBlending  |  obtain current blending mode  |
+|  OUT  |  0x204  |  GPU_ActiveBlending  |  blending method to draw sprites with  |
 |  IN  |  0x204  |  GPU_SelectedTexture  |  obtain current selected texture  |
 |  OUT  |  0x204  |  GPU_SelectedTexture  |  texture ID to select (-1 for BIOS)  |
 |  IN  |  0x205  |  GPU_SelectedRegion  |  obtain current selected region  |
 |  OUT  |  0x205  |  GPU_SelectedRegion  |  region ID to select  |
+|  IN  |  0x206  |  GPU_DrawingPointX  |  obtain X position to draw selected region  |
 |  OUT  |  0x206  |  GPU_DrawingPointX  |  set X position to draw selected region  |
+|  IN  |  0x207  |  GPU_DrawingPointY  |  obtain Y position to draw selected region  |
 |  OUT  |  0x207  |  GPU_DrawingPointY  |  set Y position to draw selected region  |
-|  ???  |  0x208  |  GPU_DrawingScaleX  |  sets X scaling with a float as input  |
+|  IN  |  0x208  |  GPU_DrawingScaleX  |  obtain X scaling as a float  |
-|  ???  |  0x209  |  GPU_DrawingScaleY  |  sets Y scaling with a float as input  |
+|  OUT  |  0x208  |  GPU_DrawingScaleX  |  sets X scaling with a float as input  |
-|  ???  |  0x20A  |  GPU_DrawingAngle  |  ???  |
+|  IN  |  0x209  |  GPU_DrawingScaleY  |  obtain Y scaling as a float  |
+|  OUT  |  0x209  |  GPU_DrawingScaleY  |  sets Y scaling with a float as input  |
+|  IN  |  0x20A  |  GPU_DrawingAngle  |  obtain the sprite rotation as a float  |
+|  OUT  |  0x20A  |  GPU_DrawingAngle  |  sets the sprite rotation with a float as input  |
+|  IN  |  0x20B  |  GPU_RegionMinX  |  obtain Min X coordinate for region  |
 |  OUT  |  0x20B  |  GPU_RegionMinX  |  set Min X coordinate for region  |
+|  IN  |  0x20C  |  GPU_RegionMinY  |  obtain Min Y coordinate for region  |
 |  OUT  |  0x20C  |  GPU_RegionMinY  |  set Min Y coordinate for region  |
+|  IN  |  0x20D  |  GPU_RegionMaxX  |  obtain Max X coordinate for region  |
 |  OUT  |  0x20D  |  GPU_RegionMaxX  |  set Max X coordinate for region  |
+|  IN  |  0x20E  |  GPU_RegionMaxY  |  obtain Max Y coordinate for region  |
 |  OUT  |  0x20E  |  GPU_RegionMaxY  |  set Max Y coordinate for region  |
+|  IN  |  0x20F  |  GPU_RegionHotspotX  |  obtain region Hotspot X coordinate  |
 |  OUT  |  0x20F  |  GPU_RegionHotspotX  |  set region Hotspot X coordinate  |
+|  IN  |  0x210  |  GPU_RegionHotspotY  |  obtain region Hotspot Y coordinate  |
 |  OUT  |  0x210  |  GPU_RegionHotspotY  |  set region Hotspot Y coordinate  |
@@ Line 761: / Line 775: @@
 ===Description===
-OR performs a **Bitwise iOR** (inclusive OR) between each pair of respective bits in the 2 specified operands. The result is stored in the first of them, which is always a register.
+OR performs a **Bitwise INCLUSIVE OR** between each pair of respective bits in the 2 specified operands. The result is stored in the first of them, which is always a register.
 ====XOR====
@@ Line 776: / Line 790: @@
 ===Structure and variants===
 ^  Variant  ^  Form  ^  Action  |
-|  1  |<nowiki>XOR DSTREG, ImmediateValue</nowiki>  |<nowiki>DSTREG = DSTREG ^ ImmediateValue;</nowiki>  |
+|  1  |<code asm>XOR DSTREG, ImmediateValue</code>  |<code c>DSTREG = DSTREG ^ ImmediateValue;</code>  |
-|  2  |<nowiki>XOR DSTREG, SRCREG</nowiki>  |<nowiki>DSTREG = DSTREG ^ SRCREG;</nowiki>  |
+|  2  |<code asm>XOR DSTREG, SRCREG</code>  |<code c>DSTREG = DSTREG ^ SRCREG;</code>  |
 ===Description===
@@ Line 800: / Line 814: @@
 ===Structure and variants===
-  * <code>(Variant 1): SHL { Register1 }, { ImmediateValue }</code>
+^  Variant  ^  Form  ^  Action  |
-  * <code>(Variant 2): SHL { Register1 }, { Register2 }</code>
+|  1  |<code asm>SHL DSTREG, ImmediateValue</code>  |<code c>DSTREG = DSTREG << ImmediateValue;</code>  |
+|  2  |<code asm>SHL DSTREG, SRCREG</code>  |<code c>DSTREG = DSTREG << SRCREG;</code>  |
-===Processing actions===
-  * <code>(Variant 1): Register1 = Register1 << ImmediateValue</code>
-  * <code>(Variant 2): Register1 = Register1 << Register2</code>
 ===Description===
 SHL performs an bit shift to the left in the specified register. The second operand is
-taken as an integer number of positions to shift. Shifting 0 positions has no effect, while
+taken as an integer number of positions to shift.
-negative values result in shifting right. The shift type is logical: in shifts left, overflow is
-discarded and zeroes are introduced as least significant bits. In shifts right, underflow is
+Shifting 0 positions has no effect, while negative values result in shifting right.
-discarded and zeroes are introduced as most significant bits.
+The shift type is logical: in shifts left, overflow is discarded and zeroes are introduced as least significant bits.
+In shifts right, underflow is discarded and zeroes are introduced as most significant bits.

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