[Mesa-dev] [PATCH 2/2] st/mesa: new st_DrawAtlasBitmaps() function for drawing bitmap text
Brian Paul
brianp at vmware.com
Sat Feb 13 01:07:38 UTC 2016
This basically saves the current pipeline state, sets up state for
rendering, constructs a set of textured quads, renders, then restores
the previous pipeline state.
It shouldn't be hard to implement a similar function for non-gallium
drives. With some code refactoring, the vertex definition code could
probably be shared.
---
src/mesa/state_tracker/st_cb_bitmap.c | 143 +++++++++++++++++++++++++++++++++-
src/mesa/state_tracker/st_context.h | 1 +
2 files changed, 141 insertions(+), 3 deletions(-)
diff --git a/src/mesa/state_tracker/st_cb_bitmap.c b/src/mesa/state_tracker/st_cb_bitmap.c
index d84bfef..461159b 100644
--- a/src/mesa/state_tracker/st_cb_bitmap.c
+++ b/src/mesa/state_tracker/st_cb_bitmap.c
@@ -33,6 +33,7 @@
#include "main/imports.h"
#include "main/image.h"
#include "main/bufferobj.h"
+#include "main/dlist.h"
#include "main/macros.h"
#include "main/pbo.h"
#include "program/program.h"
@@ -51,6 +52,7 @@
#include "pipe/p_shader_tokens.h"
#include "util/u_inlines.h"
#include "util/u_simple_shaders.h"
+#include "util/u_upload_mgr.h"
#include "program/prog_instruction.h"
#include "cso_cache/cso_context.h"
@@ -182,7 +184,8 @@ make_bitmap_texture(struct gl_context *ctx, GLsizei width, GLsizei height,
static void
setup_render_state(struct gl_context *ctx,
struct pipe_sampler_view *sv,
- const GLfloat *color)
+ const GLfloat *color,
+ bool atlas)
{
struct st_context *st = st_context(ctx);
struct cso_context *cso = st->cso_context;
@@ -249,7 +252,10 @@ setup_render_state(struct gl_context *ctx,
for (i = 0; i < st->state.num_samplers[PIPE_SHADER_FRAGMENT]; i++) {
samplers[i] = &st->state.samplers[PIPE_SHADER_FRAGMENT][i];
}
- samplers[fpv->bitmap_sampler] = &st->bitmap.sampler;
+ if (atlas)
+ samplers[fpv->bitmap_sampler] = &st->bitmap.atlas_sampler;
+ else
+ samplers[fpv->bitmap_sampler] = &st->bitmap.sampler;
cso_set_samplers(cso, PIPE_SHADER_FRAGMENT, num,
(const struct pipe_sampler_state **) samplers);
}
@@ -324,7 +330,7 @@ draw_bitmap_quad(struct gl_context *ctx, GLint x, GLint y, GLfloat z,
assert(height <= (GLsizei) maxSize);
}
- setup_render_state(ctx, sv, color);
+ setup_render_state(ctx, sv, color, false);
/* convert Z from [0,1] to [-1,-1] to match viewport Z scale/bias */
z = z * 2.0f - 1.0f;
@@ -571,6 +577,9 @@ init_bitmap_state(struct st_context *st)
st->bitmap.sampler.mag_img_filter = PIPE_TEX_FILTER_NEAREST;
st->bitmap.sampler.normalized_coords = st->internal_target == PIPE_TEXTURE_2D;
+ st->bitmap.atlas_sampler = st->bitmap.sampler;
+ st->bitmap.atlas_sampler.normalized_coords = 0;
+
/* init baseline rasterizer state once */
memset(&st->bitmap.rasterizer, 0, sizeof(st->bitmap.rasterizer));
st->bitmap.rasterizer.half_pixel_center = 1;
@@ -665,11 +674,139 @@ st_Bitmap(struct gl_context *ctx, GLint x, GLint y,
}
+/**
+ * Called via ctx->Driver.DrawAtlasBitmap()
+ */
+static void
+st_DrawAtlasBitmaps(struct gl_context *ctx,
+ const struct gl_bitmap_atlas *atlas,
+ GLuint count, const GLubyte *ids)
+{
+ struct st_context *st = st_context(ctx);
+ struct pipe_context *pipe = st->pipe;
+ struct st_texture_object *stObj = st_texture_object(atlas->texObj);
+ struct pipe_sampler_view *sv;
+ /* convert Z from [0,1] to [-1,-1] to match viewport Z scale/bias */
+ const float z = ctx->Current.RasterPos[2] * 2.0f - 1.0f;
+ const float *color = ctx->Current.RasterColor;
+ const float clip_x_scale = 2.0f / st->state.framebuffer.width;
+ const float clip_y_scale = 2.0f / st->state.framebuffer.height;
+ const unsigned num_verts = count * 4;
+ const unsigned num_vert_bytes = num_verts * sizeof(struct st_util_vertex);
+ struct st_util_vertex *verts;
+ struct pipe_vertex_buffer vb = {0};
+ unsigned i;
+
+ if (!st->bitmap.cache) {
+ init_bitmap_state(st);
+ }
+
+ st_flush_bitmap_cache(st);
+
+ st_validate_state(st);
+
+ sv = st_create_texture_sampler_view(pipe, stObj->pt);
+
+ setup_render_state(ctx, sv, color, true);
+
+ vb.stride = sizeof(struct st_util_vertex);
+
+ u_upload_alloc(st->uploader, 0, num_vert_bytes, 4,
+ &vb.buffer_offset, &vb.buffer, (void **) &verts);
+
+ /* build quads vertex data */
+ for (i = 0; i < count; i++) {
+ const GLfloat epsilon = 0.0001F;
+ const struct gl_bitmap_glyph *g = &atlas->glyphs[ids[i]];
+ const float xmove = g->xmove, ymove = g->ymove;
+ const float xorig = g->xorig, yorig = g->yorig;
+ const float s0 = g->x, t0 = g->y;
+ const float s1 = s0 + g->w, t1 = t0 + g->h;
+ const float x0 = IFLOOR(ctx->Current.RasterPos[0] - xorig + epsilon);
+ const float y0 = IFLOOR(ctx->Current.RasterPos[1] - yorig + epsilon);
+ const float x1 = x0 + g->w, y1 = y0 + g->h;
+ const float clip_x0 = x0 * clip_x_scale - 1.0f;
+ const float clip_y0 = y0 * clip_y_scale - 1.0f;
+ const float clip_x1 = x1 * clip_x_scale - 1.0f;
+ const float clip_y1 = y1 * clip_y_scale - 1.0f;
+
+ /* lower-left corner */
+ verts->x = clip_x0;
+ verts->y = clip_y0;
+ verts->z = z;
+ verts->r = color[0];
+ verts->g = color[1];
+ verts->b = color[2];
+ verts->a = color[3];
+ verts->s = s0;
+ verts->t = t0;
+ verts++;
+
+ /* lower-right corner */
+ verts->x = clip_x1;
+ verts->y = clip_y0;
+ verts->z = z;
+ verts->r = color[0];
+ verts->g = color[1];
+ verts->b = color[2];
+ verts->a = color[3];
+ verts->s = s1;
+ verts->t = t0;
+ verts++;
+
+ /* upper-right corner */
+ verts->x = clip_x1;
+ verts->y = clip_y1;
+ verts->z = z;
+ verts->r = color[0];
+ verts->g = color[1];
+ verts->b = color[2];
+ verts->a = color[3];
+ verts->s = s1;
+ verts->t = t1;
+ verts++;
+
+ /* upper-left corner */
+ verts->x = clip_x0;
+ verts->y = clip_y1;
+ verts->z = z;
+ verts->r = color[0];
+ verts->g = color[1];
+ verts->b = color[2];
+ verts->a = color[3];
+ verts->s = s0;
+ verts->t = t1;
+ verts++;
+
+ /* Update the raster position */
+ ctx->Current.RasterPos[0] += xmove;
+ ctx->Current.RasterPos[1] += ymove;
+ }
+
+ u_upload_unmap(st->uploader);
+
+ cso_set_vertex_buffers(st->cso_context,
+ cso_get_aux_vertex_buffer_slot(st->cso_context),
+ 1, &vb);
+
+ cso_draw_arrays(st->cso_context, PIPE_PRIM_QUADS, 0, num_verts);
+
+ restore_render_state(ctx);
+
+ pipe_resource_reference(&vb.buffer, NULL);
+
+ /* We uploaded modified constants, need to invalidate them. */
+ st->dirty.mesa |= _NEW_PROGRAM_CONSTANTS;
+}
+
+
+
/** Per-context init */
void
st_init_bitmap_functions(struct dd_function_table *functions)
{
functions->Bitmap = st_Bitmap;
+ functions->DrawAtlasBitmaps = st_DrawAtlasBitmaps;
}
diff --git a/src/mesa/state_tracker/st_context.h b/src/mesa/state_tracker/st_context.h
index 85a1396..98187d7 100644
--- a/src/mesa/state_tracker/st_context.h
+++ b/src/mesa/state_tracker/st_context.h
@@ -191,6 +191,7 @@ struct st_context
struct {
struct pipe_rasterizer_state rasterizer;
struct pipe_sampler_state sampler;
+ struct pipe_sampler_state atlas_sampler;
enum pipe_format tex_format;
void *vs;
struct bitmap_cache *cache;
--
1.9.1
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