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/*
* Copyright (c) 2026 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Radoslaw Kujawa.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* veritemesa swrast spans over the /dev/verite3d VRAM mmap window.
*/
#include "vrdrv.h"
#include "imports.h"
#include "swrast/swrast.h"
void
vrFence(vrmesa_context *vmesa)
{
if (vmesa->engine_dirty) {
rlgl_finish(&vmesa->rl);
vmesa->engine_dirty = GL_FALSE;
VRP_COUNT(fences);
}
}
/*
* Base of the buffer swrast is currently addressing.
*/
static GLubyte *
vr_span_base(vrmesa_context *vmesa)
{
struct rlgl *rl = &vmesa->rl;
uint32_t fb;
vrFence(vmesa);
fb = vmesa->span_front ? rl->fb[rl->back ^ 1] : rl->fb[rl->back];
return (GLubyte *)(uintptr_t)v3d_vram(&rl->v) + fb;
}
static GLushort *
vr_zrow(vrmesa_context *vmesa, GLint y)
{
struct rlgl *rl = &vmesa->rl;
vrFence(vmesa);
return (GLushort *)((GLubyte *)(uintptr_t)v3d_vram(&rl->v) +
rl->zbuf + (size_t)(rl->v.height - 1 - y) * rl->v.stride);
}
static void
vr_set_buffer(GLcontext *ctx, GLframebuffer *buffer, GLuint bufferBit)
{
vrmesa_context *vmesa = VRMESA_CONTEXT(ctx);
(void)buffer;
switch (bufferBit) {
case DD_FRONT_LEFT_BIT:
vmesa->span_front = GL_TRUE;
break;
case DD_BACK_LEFT_BIT:
vmesa->span_front = GL_FALSE;
break;
default:
_mesa_problem(ctx, "bad bufferBit in vr_set_buffer");
}
}
#define VR_SWAP16(x) ((GLushort)((((x) & 0xff) << 8) | ((x) >> 8)))
#define NAME(PREFIX) PREFIX##_565
#define SPAN_VARS \
vrmesa_context *vmesa = VRMESA_CONTEXT((GLcontext *)ctx); \
GLubyte *vrbuf = vr_span_base(vmesa); \
const GLuint vrstride = vmesa->rl.v.stride; \
const GLint vrheight = vmesa->rl.v.height;
#define INIT_PIXEL_PTR(P, X, Y) \
GLushort *P = (GLushort *)(vrbuf + \
(size_t)(vrheight - 1 - (Y)) * vrstride + (X) * 2)
#define INC_PIXEL_PTR(P) P += 1
#define STORE_RGB_PIXEL(P, X, Y, R, G, B) \
*P = VR_SWAP16((((R) & 0xf8) << 8) | (((G) & 0xfc) << 3) | \
((B) >> 3))
#define STORE_RGBA_PIXEL(P, X, Y, R, G, B, A) \
*P = VR_SWAP16((((R) & 0xf8) << 8) | (((G) & 0xfc) << 3) | \
((B) >> 3))
#define FETCH_RGBA_PIXEL(R, G, B, A, P) \
do { \
GLushort px_ = VR_SWAP16(*P); \
R = (((px_ >> 8) & 0xf8) | ((px_ >> 11) & 0x7)); \
G = (((px_ >> 3) & 0xfc) | ((px_ >> 5) & 0x3)); \
B = (((px_ << 3) & 0xf8) | ((px_ ) & 0x7)); \
A = CHAN_MAX; \
} while (0)
#include "swrast/s_spantemp.h"
static void
vr_write_depth_span(GLcontext *ctx, GLuint n, GLint x, GLint y,
const GLdepth depth[], const GLubyte mask[])
{
GLushort *zrow = vr_zrow(VRMESA_CONTEXT(ctx), y) + x;
GLuint i;
for (i = 0; i < n; i++)
if (mask == NULL || mask[i])
zrow[i] = VR_SWAP16((GLushort)depth[i]);
}
static void
vr_write_mono_depth_span(GLcontext *ctx, GLuint n, GLint x, GLint y,
const GLdepth depth, const GLubyte mask[])
{
GLushort *zrow = vr_zrow(VRMESA_CONTEXT(ctx), y) + x;
GLuint i;
for (i = 0; i < n; i++)
if (mask == NULL || mask[i])
zrow[i] = VR_SWAP16((GLushort)depth);
}
static void
vr_read_depth_span(GLcontext *ctx, GLuint n, GLint x, GLint y,
GLdepth depth[])
{
const GLushort *zrow = vr_zrow(VRMESA_CONTEXT(ctx), y) + x;
GLuint i;
for (i = 0; i < n; i++)
depth[i] = VR_SWAP16(zrow[i]);
}
static void
vr_write_depth_pixels(GLcontext *ctx, GLuint n,
const GLint x[], const GLint y[], const GLdepth depth[],
const GLubyte mask[])
{
vrmesa_context *vmesa = VRMESA_CONTEXT(ctx);
GLuint i;
for (i = 0; i < n; i++)
if (mask == NULL || mask[i])
vr_zrow(vmesa, y[i])[x[i]] =
VR_SWAP16((GLushort)depth[i]);
}
static void
vr_read_depth_pixels(GLcontext *ctx, GLuint n,
const GLint x[], const GLint y[], GLdepth depth[])
{
vrmesa_context *vmesa = VRMESA_CONTEXT(ctx);
GLuint i;
for (i = 0; i < n; i++)
depth[i] = VR_SWAP16(vr_zrow(vmesa, y[i])[x[i]]);
}
void
vrInitSpanFuncs(GLcontext *ctx)
{
struct swrast_device_driver *swdd =
_swrast_GetDeviceDriverReference(ctx);
swdd->SetBuffer = vr_set_buffer;
swdd->WriteRGBASpan = write_rgba_span_565;
swdd->WriteRGBSpan = write_rgb_span_565;
swdd->WriteMonoRGBASpan = write_monorgba_span_565;
swdd->WriteRGBAPixels = write_rgba_pixels_565;
swdd->WriteMonoRGBAPixels = write_monorgba_pixels_565;
swdd->ReadRGBASpan = read_rgba_span_565;
swdd->ReadRGBAPixels = read_rgba_pixels_565;
swdd->WriteDepthSpan = vr_write_depth_span;
swdd->WriteMonoDepthSpan = vr_write_mono_depth_span;
swdd->ReadDepthSpan = vr_read_depth_span;
swdd->WriteDepthPixels = vr_write_depth_pixels;
swdd->ReadDepthPixels = vr_read_depth_pixels;
}
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