/**
+ * The bitmap cache attempts to accumulate multiple glBitmap calls in a
+ * buffer which is then rendered en mass upon a flush, state change, etc.
+ * A wide, short buffer is used to target the common case of a series
+ * of glBitmap calls being used to draw text.
+ */
+static GLboolean UseBitmapCache = 0*GL_TRUE;
+
+
+#define BITMAP_CACHE_WIDTH 512
+#define BITMAP_CACHE_HEIGHT 32
+
+struct bitmap_cache
+{
+ /** An I8 texture image: */
+ GLubyte buffer[BITMAP_CACHE_HEIGHT][BITMAP_CACHE_WIDTH];
+ GLboolean empty;
+ /** Window pos to render the cached image */
+ GLint xpos, ypos;
+ struct pipe_texture *texture;
+};
+
+
+
+
+/**
* Make fragment program for glBitmap:
* Sample the texture and kill the fragment if the bit is 0.
* This program will be combined with the user's fragment program.
static void
draw_bitmap_quad(GLcontext *ctx, GLint x, GLint y, GLfloat z,
GLsizei width, GLsizei height,
- struct pipe_texture *pt,
- struct st_fragment_program *stfp)
+ struct pipe_texture *pt)
{
struct st_context *st = ctx->st;
struct pipe_context *pipe = ctx->st->pipe;
struct cso_context *cso = ctx->st->cso_context;
+ struct st_fragment_program *stfp;
GLuint maxSize;
+ stfp = combined_bitmap_fragment_program(ctx);
+
/* limit checks */
- /* XXX if DrawPixels image is larger than max texture size, break
+ /* XXX if the bitmap is larger than the max texture size, break
* it up into chunks.
*/
maxSize = 1 << (pipe->screen->get_param(pipe->screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);
static void
+init_bitmap_cache(struct st_context *st)
+{
+ struct pipe_context *pipe = st->pipe;
+ struct pipe_screen *screen = pipe->screen;
+ enum pipe_format format;
+
+ st->bitmap.cache = CALLOC_STRUCT(bitmap_cache);
+ if (!st->bitmap.cache)
+ return;
+
+ /* find a usable texture format */
+ if (screen->is_format_supported(screen, PIPE_FORMAT_U_I8, PIPE_TEXTURE)) {
+ format = PIPE_FORMAT_U_I8;
+ }
+ else {
+ /* XXX support more formats */
+ assert(0);
+ }
+
+ st->bitmap.cache->texture
+ = st_texture_create(st, PIPE_TEXTURE_2D, format, 0,
+ BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT, 1, 0);
+ if (!st->bitmap.cache->texture) {
+ FREE(st->bitmap.cache);
+ st->bitmap.cache = NULL;
+ return;
+ }
+
+ st->bitmap.cache->empty = GL_TRUE;
+}
+
+
+/**
+ * If there's anything in the bitmap cache, draw/flush it now.
+ */
+void
+st_flush_bitmap_cache(struct st_context *st)
+{
+ if (!st->bitmap.cache->empty) {
+ struct pipe_context *pipe = st->pipe;
+ struct pipe_screen *screen = pipe->screen;
+ struct pipe_surface *surf;
+ void *dest;
+
+ /* update the texture map image */
+ surf = screen->get_tex_surface(screen, st->bitmap.cache->texture, 0, 0, 0);
+ dest = pipe_surface_map(surf);
+ memcpy(dest, st->bitmap.cache->buffer, sizeof(st->bitmap.cache->buffer));
+ pipe_surface_unmap(surf);
+ pipe_surface_reference(&surf, NULL);
+
+ pipe->texture_update(pipe, st->bitmap.cache->texture, 0, 0x1);
+
+ draw_bitmap_quad(st->ctx,
+ st->bitmap.cache->xpos,
+ st->bitmap.cache->ypos,
+ st->ctx->Current.RasterPos[2],
+ BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
+ st->bitmap.cache->texture);
+
+ memset(st->bitmap.cache->buffer, 0, sizeof(st->bitmap.cache->buffer));
+ st->bitmap.cache->empty = GL_TRUE;
+ }
+}
+
+
+/**
+ * Try to accumulate this glBitmap call in the bitmap cache.
+ * \return GL_TRUE for success, GL_FALSE if bitmap is too large, etc.
+ */
+static GLboolean
+accum_bitmap(struct st_context *st,
+ GLint x, GLint y, GLsizei width, GLsizei height,
+ const struct gl_pixelstore_attrib *unpack,
+ const GLubyte *bitmap )
+{
+ int row, col;
+ int px = -999, py;
+
+ if (width > BITMAP_CACHE_WIDTH ||
+ height > BITMAP_CACHE_HEIGHT)
+ return GL_FALSE; /* too big to cache */
+
+ if (!st->bitmap.cache->empty) {
+ px = x - st->bitmap.cache->xpos; /* pos in buffer */
+ py = y - st->bitmap.cache->ypos;
+ if (px < 0 || px + width > BITMAP_CACHE_WIDTH ||
+ py < 0 || py + height > BITMAP_CACHE_HEIGHT) {
+ /* This bitmap would extend beyond cache bounds,
+ * so flush and continue.
+ */
+ st_flush_bitmap_cache(st);
+ }
+ }
+
+ if (st->bitmap.cache->empty) {
+ /* Initialize. Center bitmap vertically in the buffer. */
+ px = 0;
+ py = (BITMAP_CACHE_HEIGHT - height) / 2;
+ st->bitmap.cache->xpos = x;
+ st->bitmap.cache->ypos = y - py;
+ st->bitmap.cache->empty = GL_FALSE;
+ }
+
+ assert(px != -999);
+
+ /* XXX try to combine this code with code in make_bitmap_texture() */
+#define SET_PIXEL(COL, ROW) \
+ st->bitmap.cache->buffer[py + (ROW)][px + (COL)] = 0xff;
+
+ for (row = 0; row < height; row++) {
+ const GLubyte *src = (const GLubyte *) _mesa_image_address2d(unpack,
+ bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, row, 0);
+
+ if (unpack->LsbFirst) {
+ /* Lsb first */
+ GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
+ for (col = 0; col < width; col++) {
+
+ if (*src & mask) {
+ SET_PIXEL(col, row);
+ }
+
+ if (mask == 128U) {
+ src++;
+ mask = 1U;
+ }
+ else {
+ mask = mask << 1;
+ }
+ }
+
+ /* get ready for next row */
+ if (mask != 1)
+ src++;
+ }
+ else {
+ /* Msb first */
+ GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
+ for (col = 0; col < width; col++) {
+
+ if (*src & mask) {
+ SET_PIXEL(col, row);
+ }
+
+ if (mask == 1U) {
+ src++;
+ mask = 128U;
+ }
+ else {
+ mask = mask >> 1;
+ }
+ }
+
+ /* get ready for next row */
+ if (mask != 128)
+ src++;
+ }
+
+ } /* row */
+
+ return GL_TRUE; /* accumulated */
+}
+
+
+
+/**
+ * Called via ctx->Driver.Bitmap()
+ */
+static void
st_Bitmap(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
const struct gl_pixelstore_attrib *unpack, const GLubyte *bitmap )
{
- struct st_fragment_program *stfp;
struct st_context *st = ctx->st;
struct pipe_texture *pt;
st_validate_state(st);
- stfp = combined_bitmap_fragment_program(ctx);
-
if (!st->bitmap.vs) {
/* create pass-through vertex shader now */
const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
&st->bitmap.vert_shader);
}
- st_validate_state(st);
+ if (UseBitmapCache && accum_bitmap(st, x, y, width, height, unpack, bitmap))
+ return;
pt = make_bitmap_texture(ctx, width, height, unpack, bitmap);
if (pt) {
assert(pt->target == PIPE_TEXTURE_2D);
draw_bitmap_quad(ctx, x, y, ctx->Current.RasterPos[2],
- width, height,
- pt, stfp);
+ width, height, pt);
pipe_texture_reference(&pt, NULL);
}
}
-
-void st_init_bitmap_functions(struct dd_function_table *functions)
+/** Per-context init */
+void
+st_init_bitmap_functions(struct dd_function_table *functions)
{
functions->Bitmap = st_Bitmap;
}
+/** Per-context init */
+void
+st_init_bitmap(struct st_context *st)
+{
+ init_bitmap_cache(st);
+}
+
+
+/** Per-context tear-down */
void
st_destroy_bitmap(struct st_context *st)
{
pipe->delete_vs_state(pipe, st->bitmap.vs);
st->bitmap.vs = NULL;
}
+
if (st->bitmap.vbuf) {
pipe->winsys->buffer_destroy(pipe->winsys, st->bitmap.vbuf);
st->bitmap.vbuf = NULL;
}
-}
+ if (st->bitmap.cache) {
+ pipe_texture_release(&st->bitmap.cache->texture);
+ FREE(st->bitmap.cache);
+ st->bitmap.cache = NULL;
+ }
+}
projects / platform / upstream / mesa.git / commitdiff