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authorTony Wasserka <NeoBrainX@gmail.com>2014-12-28 23:28:58 +0100
committerTony Wasserka <NeoBrainX@gmail.com>2014-12-31 16:32:55 +0100
commit18a5e888bbeda989aba6576e7dd7e2b6c09b45ea (patch)
tree7f3fad5c0c5a78a171a5818fcc5df067423f63ff
parentPica/Rasterizer: Implement backface culling. (diff)
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-rw-r--r--src/core/hw/gpu.cpp6
-rw-r--r--src/core/hw/gpu.h3
2 files changed, 8 insertions, 1 deletions
diff --git a/src/core/hw/gpu.cpp b/src/core/hw/gpu.cpp
index dd619cb16..0ff6c6cde 100644
--- a/src/core/hw/gpu.cpp
+++ b/src/core/hw/gpu.cpp
@@ -94,11 +94,15 @@ inline void Write(u32 addr, const T data) {
int r, g, b, a;
} source_color = { 0, 0, 0, 0 };
+ // Cheap emulation of horizontal scaling: Just skip each second pixel of the
+ // input framebuffer. We keep track of this in the pixel_skip variable.
+ unsigned pixel_skip = (config.scale_horizontally != 0) ? 2 : 1;
+
switch (config.input_format) {
case Regs::PixelFormat::RGBA8:
{
// TODO: Most likely got the component order messed up.
- u8* srcptr = source_pointer + x * 4 + y * config.input_width * 4;
+ u8* srcptr = source_pointer + x * 4 * pixel_skip + y * config.input_width * 4 * pixel_skip;
source_color.r = srcptr[0]; // blue
source_color.g = srcptr[1]; // green
source_color.b = srcptr[2]; // red
diff --git a/src/core/hw/gpu.h b/src/core/hw/gpu.h
index 292f496c1..7de055232 100644
--- a/src/core/hw/gpu.h
+++ b/src/core/hw/gpu.h
@@ -157,6 +157,9 @@ struct Regs {
BitField< 8, 3, PixelFormat> input_format;
BitField<12, 3, PixelFormat> output_format;
BitField<16, 1, u32> output_tiled; // stores output in a tiled format
+
+ // TODO: Not really sure if this actually scales, or even resizes at all.
+ BitField<24, 1, u32> scale_horizontally;
};
INSERT_PADDING_WORDS(0x1);