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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.
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@ -217,11 +217,14 @@ static void DisplayTransfer(const Regs::DisplayTransferConfig& config) {
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u32 input_x = x << horizontal_scale;
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u32 input_y = y << vertical_scale;
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u32 output_y;
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if (config.flip_vertically) {
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// Flip the y value of the output data,
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// we do this after calculating the [x,y] position of the input image
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// to account for the scaling options.
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y = output_height - y - 1;
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output_y = output_height - y - 1;
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} else {
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output_y = y;
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}
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u32 dst_bytes_per_pixel = GPU::Regs::BytesPerPixel(config.output_format);
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@ -232,16 +235,16 @@ static void DisplayTransfer(const Regs::DisplayTransferConfig& config) {
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if (config.input_linear) {
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if (!config.dont_swizzle) {
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// Interpret the input as linear and the output as tiled
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u32 coarse_y = y & ~7;
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u32 coarse_y = output_y & ~7;
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u32 stride = output_width * dst_bytes_per_pixel;
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src_offset = (input_x + input_y * config.input_width) * src_bytes_per_pixel;
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dst_offset =
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VideoCore::GetMortonOffset(x, y, dst_bytes_per_pixel) + coarse_y * stride;
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dst_offset = VideoCore::GetMortonOffset(x, output_y, dst_bytes_per_pixel) +
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coarse_y * stride;
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} else {
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// Both input and output are linear
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src_offset = (input_x + input_y * config.input_width) * src_bytes_per_pixel;
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dst_offset = (x + y * output_width) * dst_bytes_per_pixel;
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dst_offset = (x + output_y * output_width) * dst_bytes_per_pixel;
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}
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} else {
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if (!config.dont_swizzle) {
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@ -251,10 +254,10 @@ static void DisplayTransfer(const Regs::DisplayTransferConfig& config) {
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src_offset = VideoCore::GetMortonOffset(input_x, input_y, src_bytes_per_pixel) +
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coarse_y * stride;
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dst_offset = (x + y * output_width) * dst_bytes_per_pixel;
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dst_offset = (x + output_y * output_width) * dst_bytes_per_pixel;
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} else {
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// Both input and output are tiled
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u32 out_coarse_y = y & ~7;
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u32 out_coarse_y = output_y & ~7;
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u32 out_stride = output_width * dst_bytes_per_pixel;
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u32 in_coarse_y = input_y & ~7;
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@ -262,7 +265,7 @@ static void DisplayTransfer(const Regs::DisplayTransferConfig& config) {
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src_offset = VideoCore::GetMortonOffset(input_x, input_y, src_bytes_per_pixel) +
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in_coarse_y * in_stride;
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dst_offset = VideoCore::GetMortonOffset(x, y, dst_bytes_per_pixel) +
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dst_offset = VideoCore::GetMortonOffset(x, output_y, dst_bytes_per_pixel) +
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out_coarse_y * out_stride;
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}
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}
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