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gpu: DisplayTransfer: a less amazing algorithm for flip 

the old implementation modifies the loop variable in the loop. Though it actually works, it is really confusing. Makes it morereadable now.
merge-requests/60/head
wwylele 2016-09-27 21:48:03 +08:00
parent 30ab0fa45d
commit 58ae94af4c
1 changed files with 11 additions and 8 deletions
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19
src/core/hw/gpu.cpp
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@ -217,11 +217,14 @@ static void DisplayTransfer(const Regs::DisplayTransferConfig& config) {
u32 input_x = x << horizontal_scale;
u32 input_y = y << vertical_scale;
u32 output_y;
if (config.flip_vertically) {
// Flip the y value of the output data,
// we do this after calculating the [x,y] position of the input image
// to account for the scaling options.
y = output_height - y - 1;
output_y = output_height - y - 1;
} else {
output_y = y;
}
u32 dst_bytes_per_pixel = GPU::Regs::BytesPerPixel(config.output_format);
@ -232,16 +235,16 @@ static void DisplayTransfer(const Regs::DisplayTransferConfig& config) {
if (config.input_linear) {
if (!config.dont_swizzle) {
// Interpret the input as linear and the output as tiled
u32 coarse_y = y & ~7;
u32 coarse_y = output_y & ~7;
u32 stride = output_width * dst_bytes_per_pixel;
src_offset = (input_x + input_y * config.input_width) * src_bytes_per_pixel;
dst_offset =
VideoCore::GetMortonOffset(x, y, dst_bytes_per_pixel) + coarse_y * stride;
dst_offset = VideoCore::GetMortonOffset(x, output_y, dst_bytes_per_pixel) +
coarse_y * stride;
} else {
// Both input and output are linear
src_offset = (input_x + input_y * config.input_width) * src_bytes_per_pixel;
dst_offset = (x + y * output_width) * dst_bytes_per_pixel;
dst_offset = (x + output_y * output_width) * dst_bytes_per_pixel;
}
} else {
if (!config.dont_swizzle) {
@ -251,10 +254,10 @@ static void DisplayTransfer(const Regs::DisplayTransferConfig& config) {
src_offset = VideoCore::GetMortonOffset(input_x, input_y, src_bytes_per_pixel) +
coarse_y * stride;
dst_offset = (x + y * output_width) * dst_bytes_per_pixel;
dst_offset = (x + output_y * output_width) * dst_bytes_per_pixel;
} else {
// Both input and output are tiled
u32 out_coarse_y = y & ~7;
u32 out_coarse_y = output_y & ~7;
u32 out_stride = output_width * dst_bytes_per_pixel;
u32 in_coarse_y = input_y & ~7;
@ -262,7 +265,7 @@ static void DisplayTransfer(const Regs::DisplayTransferConfig& config) {
src_offset = VideoCore::GetMortonOffset(input_x, input_y, src_bytes_per_pixel) +
in_coarse_y * in_stride;
dst_offset = VideoCore::GetMortonOffset(x, y, dst_bytes_per_pixel) +
dst_offset = VideoCore::GetMortonOffset(x, output_y, dst_bytes_per_pixel) +
out_coarse_y * out_stride;
}
}