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GPU: Use shifts instead of multiplications to calculate the actual size of the output.

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This commit is contained in:
Emmanuel Gil Peyrot 2015-05-22 01:05:34 +02:00
parent 6a0eea93e0
commit 8ee814ec27
1 changed files with 6 additions and 6 deletions
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12
src/core/hw/gpu.cpp
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@ -125,11 +125,11 @@ inline void Write(u32 addr, const T data) {
break; break;
} }
unsigned horizontal_scale = (config.scaling != config.NoScale) ? 2 : 1; bool horizontal_scale = config.scaling != config.NoScale;
unsigned vertical_scale = (config.scaling == config.ScaleXY) ? 2 : 1; bool vertical_scale = config.scaling == config.ScaleXY;
u32 output_width = config.output_width / horizontal_scale; u32 output_width = config.output_width >> horizontal_scale;
u32 output_height = config.output_height / vertical_scale; u32 output_height = config.output_height >> vertical_scale;
u32 input_size = config.input_width * config.input_height * GPU::Regs::BytesPerPixel(config.input_format); u32 input_size = config.input_width * config.input_height * GPU::Regs::BytesPerPixel(config.input_format);
u32 output_size = output_width * output_height * GPU::Regs::BytesPerPixel(config.output_format); u32 output_size = output_width * output_height * GPU::Regs::BytesPerPixel(config.output_format);
@ -161,8 +161,8 @@ inline void Write(u32 addr, const T data) {
// Calculate the [x,y] position of the input image // Calculate the [x,y] position of the input image
// based on the current output position and the scale // based on the current output position and the scale
u32 input_x = x * horizontal_scale; u32 input_x = x << horizontal_scale;
u32 input_y = y * vertical_scale; u32 input_y = y << vertical_scale;
if (config.flip_vertically) { if (config.flip_vertically) {
// Flip the y value of the output data, // Flip the y value of the output data,