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GPU/DisplayTransfer: Made the scaling bits a single 2bit value 

Rephrased some comments.
This commit is contained in:
Subv 2015-03-12 13:11:57 -05:00
parent ae0dfcae1d
commit 23b401c3ac
2 changed files with 17 additions and 6 deletions
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14
src/core/hw/gpu.cpp
View File

@ -116,9 +116,15 @@ inline void Write(u32 addr, const T data) {
u8* src_pointer = Memory::GetPointer(Memory::PhysicalToVirtualAddress(config.GetPhysicalInputAddress()));
u8* dst_pointer = Memory::GetPointer(Memory::PhysicalToVirtualAddress(config.GetPhysicalOutputAddress()));
unsigned horizontal_scale = (config.scale_x != 0 || config.scale_xy != 0) ? 2 : 1;
unsigned vertical_scale = (config.scale_xy != 0) ? 2 : 1;
if (config.scaling > config.ScaleXY) {
LOG_CRITICAL(HW_GPU, "Unimplemented display transfer scaling mode %u", config.scaling.Value());
UNIMPLEMENTED();
break;
}
unsigned horizontal_scale = (config.scaling != config.NoScale) ? 2 : 1;
unsigned vertical_scale = (config.scaling == config.ScaleXY) ? 2 : 1;
u32 output_width = config.output_width / horizontal_scale;
u32 output_height = config.output_height / vertical_scale;
@ -138,7 +144,7 @@ inline void Write(u32 addr, const T data) {
break;
}
// TODO(Subv): Blend the pixels when horizontal / vertical scaling is enabled,
// TODO(Subv): Implement the box filter when scaling is enabled
// right now we're just skipping the extra pixels.
for (u32 y = 0; y < output_height; ++y) {
for (u32 x = 0; x < output_width; ++x) {

9
src/core/hw/gpu.h
View File

@ -188,6 +188,12 @@ struct Regs {
BitField<16, 16, u32> input_height;
};
enum ScalingMode : u32 {
NoScale = 0, // Doesn't scale the image
ScaleX = 1, // Downscales the image in half in the X axis and applies a box filter
ScaleXY = 2, // Downscales the image in half in both the X and Y axes and applies a box filter
};
union {
u32 flags;
@ -197,8 +203,7 @@ struct Regs {
BitField< 8, 3, PixelFormat> input_format;
BitField<12, 3, PixelFormat> output_format;
BitField<24, 1, u32> scale_x; // Shrinks the image in half horizontally, blending the extra pixels
BitField<25, 1, u32> scale_xy; // Shrinks the image horizontally and vertically, blending the extra pixels
BitField<24, 2, ScalingMode> scaling; // Determines the scaling mode of the transfer
};
INSERT_PADDING_WORDS(0x1);