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Merge pull request #1996 from heuripedes/gl-perf

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(gl_raster_font) Reduce the size of the font atlas textures
This commit is contained in:
Twinaphex 2015-07-19 18:31:47 +02:00
commit c3af671a6d
1 changed files with 89 additions and 32 deletions
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121
gfx/drivers_font/gl_raster_font.c
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@ -47,13 +47,94 @@ typedef struct
gfx_font_raster_block_t *block;
} gl_raster_t;
static void gl_raster_font_free_font(void *data);
static bool gl_raster_font_upload_atlas(gl_raster_t *font,
const struct font_atlas *atlas,
unsigned width, unsigned height)
{
unsigned i, j;
GLint gl_internal = GL_LUMINANCE_ALPHA;
GLenum gl_format = GL_LUMINANCE_ALPHA;
size_t ncomponents = 2;
uint8_t *tmp = NULL;
struct retro_hw_render_callback *cb = video_driver_callback();
bool ancient = false; /* add a check here if needed */
bool modern = font->gl->core_context ||
(cb->context_type == RETRO_HW_CONTEXT_OPENGL &&
cb->version_major >= 3);
if (ancient)
{
gl_internal = gl_format = GL_RGBA;
ncomponents = 4;
}
#ifdef HAVE_OPENGLES
(void)modern;
#else
else if (modern)
{
GLint swizzle[] = { GL_ONE, GL_ONE, GL_ONE, GL_RED };
glTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_SWIZZLE_RGBA, swizzle);
gl_internal = GL_R8;
gl_format = GL_RED;
ncomponents = 1;
}
#endif
tmp = (uint8_t*)calloc(height, width * ncomponents);
if (!tmp)
return false;
for (i = 0; i < atlas->height; ++i)
{
const uint8_t *src = &atlas->buffer[i * atlas->width];
uint8_t *dst = &tmp[i * width * ncomponents];
switch (ncomponents)
{
case 1:
memcpy(dst, src, atlas->width);
src += atlas->width;
break;
case 2:
for (j = 0; j < atlas->width; ++j)
{
*dst++ = 0xff;
*dst++ = *src++;
}
break;
case 4:
for (j = 0; j < atlas->width; ++j)
{
*dst++ = 0xff;
*dst++ = 0xff;
*dst++ = 0xff;
*dst++ = *src++;
}
break;
default:
RARCH_ERR("Unsupported number of components: %u\n", (unsigned)ncomponents);
free(tmp);
return false;
}
}
glTexImage2D(GL_TEXTURE_2D, 0, gl_internal, width, height,
0, gl_format, GL_UNSIGNED_BYTE, tmp);
free(tmp);
return true;
}
static void *gl_raster_font_init_font(void *data,
const char *font_path, float font_size)
{
unsigned width, height;
uint8_t *tmp_buffer;
const struct font_atlas *atlas = NULL;
gl_raster_t *font = (gl_raster_t*)calloc(1, sizeof(*font));
gl_raster_t *font = (gl_raster_t*)calloc(1, sizeof(*font));
if (!font)
return NULL;
@ -77,39 +158,15 @@ static void *gl_raster_font_init_font(void *data,
atlas = font->font_driver->get_atlas(font->font_data);
width = next_pow2(atlas->width);
height = next_pow2(atlas->height);
font->tex_width = next_pow2(atlas->width);;
font->tex_height = next_pow2(atlas->height);;
/* Ideally, we'd use single component textures, but the
* difference in ways to do that between core GL and GLES/legacy GL
* is too great to bother going down that route. */
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height,
0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
tmp_buffer = (uint8_t*)malloc(atlas->width * atlas->height * 4);
if (tmp_buffer)
if (!gl_raster_font_upload_atlas(font, atlas, font->tex_width, font->tex_height))
{
unsigned i;
uint8_t *dst = tmp_buffer;
const uint8_t *src = atlas->buffer;
for (i = 0; i < atlas->width * atlas->height; i++)
{
*dst++ = 0xff;
*dst++ = 0xff;
*dst++ = 0xff;
*dst++ = *src++;
}
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, atlas->width,
atlas->height, GL_RGBA, GL_UNSIGNED_BYTE, tmp_buffer);
free(tmp_buffer);
gl_raster_font_free_font(font);
font = NULL;
}
font->tex_width = width;
font->tex_height = height;
glBindTexture(GL_TEXTURE_2D, font->gl->texture[font->gl->tex_index]);
return font;