/**
* Do glClear by drawing a quadrilateral.
* The vertices of the quad will be computed from the
* ctx->DrawBuffer->_X/Ymin/max fields.
*/
static void
clear_with_quad(struct gl_context *ctx, unsigned clear_buffers)
{
struct st_context *st = st_context(ctx);
const struct gl_framebuffer *fb = ctx->DrawBuffer;
const GLfloat fb_width = (GLfloat) fb->Width;
const GLfloat fb_height = (GLfloat) fb->Height;
const GLfloat x0 = (GLfloat) ctx->DrawBuffer->_Xmin / fb_width * 2.0f - 1.0f;
const GLfloat x1 = (GLfloat) ctx->DrawBuffer->_Xmax / fb_width * 2.0f - 1.0f;
const GLfloat y0 = (GLfloat) ctx->DrawBuffer->_Ymin / fb_height * 2.0f - 1.0f;
const GLfloat y1 = (GLfloat) ctx->DrawBuffer->_Ymax / fb_height * 2.0f - 1.0f;
unsigned num_layers =
util_framebuffer_get_num_layers(&st->state.framebuffer);
/*
printf("%s %s%s%s %f,%f %f,%f\n", __FUNCTION__,
color ? "color, " : "",
depth ? "depth, " : "",
stencil ? "stencil" : "",
x0, y0,
x1, y1);
*/
cso_save_blend(st->cso_context);
cso_save_stencil_ref(st->cso_context);
cso_save_depth_stencil_alpha(st->cso_context);
cso_save_rasterizer(st->cso_context);
cso_save_sample_mask(st->cso_context);
cso_save_viewport(st->cso_context);
cso_save_fragment_shader(st->cso_context);
cso_save_stream_outputs(st->cso_context);
cso_save_vertex_shader(st->cso_context);
cso_save_geometry_shader(st->cso_context);
cso_save_vertex_elements(st->cso_context);
cso_save_aux_vertex_buffer_slot(st->cso_context);
/* blend state: RGBA masking */
{
struct pipe_blend_state blend;
memset(&blend, 0, sizeof(blend));
if (clear_buffers & PIPE_CLEAR_COLOR) {
int num_buffers = ctx->Extensions.EXT_draw_buffers2 ?
ctx->DrawBuffer->_NumColorDrawBuffers : 1;
int i;
blend.independent_blend_enable = num_buffers > 1;
for (i = 0; i < num_buffers; i++) {
if (!(clear_buffers & (PIPE_CLEAR_COLOR0 << i)))
continue;
if (ctx->Color.ColorMask[i][0])
blend.rt[i].colormask |= PIPE_MASK_R;
if (ctx->Color.ColorMask[i][1])
blend.rt[i].colormask |= PIPE_MASK_G;
if (ctx->Color.ColorMask[i][2])
blend.rt[i].colormask |= PIPE_MASK_B;
if (ctx->Color.ColorMask[i][3])
blend.rt[i].colormask |= PIPE_MASK_A;
}
if (st->ctx->Color.DitherFlag)
blend.dither = 1;
}
cso_set_blend(st->cso_context, &blend);
}
/* depth_stencil state: always pass/set to ref value */
{
struct pipe_depth_stencil_alpha_state depth_stencil;
memset(&depth_stencil, 0, sizeof(depth_stencil));
if (clear_buffers & PIPE_CLEAR_DEPTH) {
depth_stencil.depth.enabled = 1;
depth_stencil.depth.writemask = 1;
depth_stencil.depth.func = PIPE_FUNC_ALWAYS;
}
if (clear_buffers & PIPE_CLEAR_STENCIL) {
struct pipe_stencil_ref stencil_ref;
memset(&stencil_ref, 0, sizeof(stencil_ref));
depth_stencil.stencil[0].enabled = 1;
depth_stencil.stencil[0].func = PIPE_FUNC_ALWAYS;
depth_stencil.stencil[0].fail_op = PIPE_STENCIL_OP_REPLACE;
depth_stencil.stencil[0].zpass_op = PIPE_STENCIL_OP_REPLACE;
depth_stencil.stencil[0].zfail_op = PIPE_STENCIL_OP_REPLACE;
depth_stencil.stencil[0].valuemask = 0xff;
depth_stencil.stencil[0].writemask = ctx->Stencil.WriteMask[0] & 0xff;
stencil_ref.ref_value[0] = ctx->Stencil.Clear;
cso_set_stencil_ref(st->cso_context, &stencil_ref);
}
cso_set_depth_stencil_alpha(st->cso_context, &depth_stencil);
}
cso_set_vertex_elements(st->cso_context, 2, st->velems_util_draw);
cso_set_stream_outputs(st->cso_context, 0, NULL, NULL);
cso_set_sample_mask(st->cso_context, ~0);
cso_set_rasterizer(st->cso_context, &st->clear.raster);
/* viewport state: viewport matching window dims */
{
const GLboolean invert = (st_fb_orientation(fb) == Y_0_TOP);
struct pipe_viewport_state vp;
vp.scale[0] = 0.5f * fb_width;
vp.scale[1] = fb_height * (invert ? -0.5f : 0.5f);
vp.scale[2] = 1.0f;
vp.scale[3] = 1.0f;
vp.translate[0] = 0.5f * fb_width;
vp.translate[1] = 0.5f * fb_height;
vp.translate[2] = 0.0f;
vp.translate[3] = 0.0f;
cso_set_viewport(st->cso_context, &vp);
}
set_fragment_shader(st);
cso_set_geometry_shader_handle(st->cso_context, NULL);
if (num_layers > 1)
set_vertex_shader_layered(st);
else
set_vertex_shader(st);
/* We can't translate the clear color to the colorbuffer format,
* because different colorbuffers may have different formats.
*/
/* draw quad matching scissor rect */
draw_quad(st, x0, y0, x1, y1, (GLfloat) ctx->Depth.Clear, num_layers,
(union pipe_color_union*)&ctx->Color.ClearColor);
/* Restore pipe state */
cso_restore_blend(st->cso_context);
cso_restore_stencil_ref(st->cso_context);
cso_restore_depth_stencil_alpha(st->cso_context);
cso_restore_rasterizer(st->cso_context);
cso_restore_sample_mask(st->cso_context);
cso_restore_viewport(st->cso_context);
cso_restore_fragment_shader(st->cso_context);
cso_restore_vertex_shader(st->cso_context);
cso_restore_geometry_shader(st->cso_context);
cso_restore_vertex_elements(st->cso_context);
cso_restore_aux_vertex_buffer_slot(st->cso_context);
cso_restore_stream_outputs(st->cso_context);
}
/**
* Do glClear by drawing a quadrilateral.
* The vertices of the quad will be computed from the
* ctx->DrawBuffer->_X/Ymin/max fields.
*/
static void
clear_with_quad(struct gl_context *ctx, unsigned clear_buffers)
{
struct st_context *st = st_context(ctx);
struct cso_context *cso = st->cso_context;
const struct gl_framebuffer *fb = ctx->DrawBuffer;
const GLfloat fb_width = (GLfloat) fb->Width;
const GLfloat fb_height = (GLfloat) fb->Height;
const GLfloat x0 = (GLfloat) ctx->DrawBuffer->_Xmin / fb_width * 2.0f - 1.0f;
const GLfloat x1 = (GLfloat) ctx->DrawBuffer->_Xmax / fb_width * 2.0f - 1.0f;
const GLfloat y0 = (GLfloat) ctx->DrawBuffer->_Ymin / fb_height * 2.0f - 1.0f;
const GLfloat y1 = (GLfloat) ctx->DrawBuffer->_Ymax / fb_height * 2.0f - 1.0f;
unsigned num_layers =
util_framebuffer_get_num_layers(&st->state.framebuffer);
/*
printf("%s %s%s%s %f,%f %f,%f\n", __func__,
color ? "color, " : "",
depth ? "depth, " : "",
stencil ? "stencil" : "",
x0, y0,
x1, y1);
*/
cso_save_state(cso, (CSO_BIT_BLEND |
CSO_BIT_STENCIL_REF |
CSO_BIT_DEPTH_STENCIL_ALPHA |
CSO_BIT_RASTERIZER |
CSO_BIT_SAMPLE_MASK |
CSO_BIT_MIN_SAMPLES |
CSO_BIT_VIEWPORT |
CSO_BIT_STREAM_OUTPUTS |
CSO_BIT_VERTEX_ELEMENTS |
CSO_BIT_AUX_VERTEX_BUFFER_SLOT |
CSO_BIT_PAUSE_QUERIES |
CSO_BITS_ALL_SHADERS));
/* blend state: RGBA masking */
{
struct pipe_blend_state blend;
memset(&blend, 0, sizeof(blend));
if (clear_buffers & PIPE_CLEAR_COLOR) {
int num_buffers = ctx->Extensions.EXT_draw_buffers2 ?
ctx->DrawBuffer->_NumColorDrawBuffers : 1;
int i;
blend.independent_blend_enable = num_buffers > 1;
for (i = 0; i < num_buffers; i++) {
if (!(clear_buffers & (PIPE_CLEAR_COLOR0 << i)))
continue;
if (ctx->Color.ColorMask[i][0])
blend.rt[i].colormask |= PIPE_MASK_R;
if (ctx->Color.ColorMask[i][1])
blend.rt[i].colormask |= PIPE_MASK_G;
if (ctx->Color.ColorMask[i][2])
blend.rt[i].colormask |= PIPE_MASK_B;
if (ctx->Color.ColorMask[i][3])
blend.rt[i].colormask |= PIPE_MASK_A;
}
if (ctx->Color.DitherFlag)
blend.dither = 1;
}
cso_set_blend(cso, &blend);
}
/* depth_stencil state: always pass/set to ref value */
{
struct pipe_depth_stencil_alpha_state depth_stencil;
memset(&depth_stencil, 0, sizeof(depth_stencil));
if (clear_buffers & PIPE_CLEAR_DEPTH) {
depth_stencil.depth.enabled = 1;
depth_stencil.depth.writemask = 1;
depth_stencil.depth.func = PIPE_FUNC_ALWAYS;
}
if (clear_buffers & PIPE_CLEAR_STENCIL) {
struct pipe_stencil_ref stencil_ref;
memset(&stencil_ref, 0, sizeof(stencil_ref));
depth_stencil.stencil[0].enabled = 1;
depth_stencil.stencil[0].func = PIPE_FUNC_ALWAYS;
depth_stencil.stencil[0].fail_op = PIPE_STENCIL_OP_REPLACE;
depth_stencil.stencil[0].zpass_op = PIPE_STENCIL_OP_REPLACE;
depth_stencil.stencil[0].zfail_op = PIPE_STENCIL_OP_REPLACE;
depth_stencil.stencil[0].valuemask = 0xff;
depth_stencil.stencil[0].writemask = ctx->Stencil.WriteMask[0] & 0xff;
stencil_ref.ref_value[0] = ctx->Stencil.Clear;
cso_set_stencil_ref(cso, &stencil_ref);
}
cso_set_depth_stencil_alpha(cso, &depth_stencil);
}
cso_set_vertex_elements(cso, 2, st->util_velems);
cso_set_stream_outputs(cso, 0, NULL, NULL);
cso_set_sample_mask(cso, ~0);
cso_set_min_samples(cso, 1);
cso_set_rasterizer(cso, &st->clear.raster);
/* viewport state: viewport matching window dims */
cso_set_viewport_dims(st->cso_context, fb_width, fb_height,
st_fb_orientation(fb) == Y_0_TOP);
set_fragment_shader(st);
cso_set_tessctrl_shader_handle(cso, NULL);
cso_set_tesseval_shader_handle(cso, NULL);
if (num_layers > 1)
set_vertex_shader_layered(st);
else
set_vertex_shader(st);
/* draw quad matching scissor rect.
*
* Note: if we're only clearing depth/stencil we still setup vertices
* with color, but they'll be ignored.
*
* We can't translate the clear color to the colorbuffer format,
* because different colorbuffers may have different formats.
*/
if (!st_draw_quad(st, x0, y0, x1, y1,
ctx->Depth.Clear * 2.0f - 1.0f,
0.0f, 0.0f, 0.0f, 0.0f,
(const float *) &ctx->Color.ClearColor.f,
num_layers)) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glClear");
}
/* Restore pipe state */
cso_restore_state(cso);
}
