diff options
Diffstat (limited to 'progs')
| -rw-r--r-- | progs/es1/xegl/torus.c | 151 |
1 files changed, 149 insertions, 2 deletions
diff --git a/progs/es1/xegl/torus.c b/progs/es1/xegl/torus.c index 634d12641c..9438a4fe59 100644 --- a/progs/es1/xegl/torus.c +++ b/progs/es1/xegl/torus.c @@ -22,9 +22,27 @@ #include <EGL/egl.h> - +static const struct { + GLenum internalFormat; + const char *name; + GLuint num_entries; + GLuint size; +} cpal_formats[] = { + { GL_PALETTE4_RGB8_OES, "GL_PALETTE4_RGB8_OES", 16, 3 }, + { GL_PALETTE4_RGBA8_OES, "GL_PALETTE4_RGBA8_OES", 16, 4 }, + { GL_PALETTE4_R5_G6_B5_OES, "GL_PALETTE4_R5_G6_B5_OES", 16, 2 }, + { GL_PALETTE4_RGBA4_OES, "GL_PALETTE4_RGBA4_OES", 16, 2 }, + { GL_PALETTE4_RGB5_A1_OES, "GL_PALETTE4_RGB5_A1_OES", 16, 2 }, + { GL_PALETTE8_RGB8_OES, "GL_PALETTE8_RGB8_OES", 256, 3 }, + { GL_PALETTE8_RGBA8_OES, "GL_PALETTE8_RGBA8_OES", 256, 4 }, + { GL_PALETTE8_R5_G6_B5_OES, "GL_PALETTE8_R5_G6_B5_OES", 256, 2 }, + { GL_PALETTE8_RGBA4_OES, "GL_PALETTE8_RGBA4_OES", 256, 2 }, + { GL_PALETTE8_RGB5_A1_OES, "GL_PALETTE8_RGB5_A1_OES", 256, 2 } +}; +#define NUM_CPAL_FORMATS (sizeof(cpal_formats) / sizeof(cpal_formats[0])) static GLfloat view_rotx = 0.0, view_roty = 0.0, view_rotz = 0.0; +static GLint tex_format = NUM_CPAL_FORMATS; static void @@ -163,7 +181,121 @@ reshape(int width, int height) } -static void +static GLint +make_cpal_texture(GLint idx) +{ +#define SZ 64 + GLenum internalFormat = GL_PALETTE4_RGB8_OES + idx; + GLenum Filter = GL_LINEAR; + GLubyte palette[256 * 4 + SZ * SZ]; + GLubyte *indices; + GLsizei image_size; + GLuint i, j; + GLuint packed_indices = 0; + + assert(cpal_formats[idx].internalFormat == internalFormat); + + /* init palette */ + switch (internalFormat) { + case GL_PALETTE4_RGB8_OES: + case GL_PALETTE8_RGB8_OES: + /* first entry */ + palette[0] = 255; + palette[1] = 255; + palette[2] = 255; + /* second entry */ + palette[3] = 127; + palette[4] = 127; + palette[5] = 127; + break; + case GL_PALETTE4_RGBA8_OES: + case GL_PALETTE8_RGBA8_OES: + /* first entry */ + palette[0] = 255; + palette[1] = 255; + palette[2] = 255; + palette[3] = 255; + /* second entry */ + palette[4] = 127; + palette[5] = 127; + palette[6] = 127; + palette[7] = 255; + break; + case GL_PALETTE4_R5_G6_B5_OES: + case GL_PALETTE8_R5_G6_B5_OES: + { + GLushort *pal = (GLushort *) palette; + /* first entry */ + pal[0] = (31 << 11 | 63 << 5 | 31); + /* second entry */ + pal[1] = (15 << 11 | 31 << 5 | 15); + } + break; + case GL_PALETTE4_RGBA4_OES: + case GL_PALETTE8_RGBA4_OES: + { + GLushort *pal = (GLushort *) palette; + /* first entry */ + pal[0] = (15 << 12 | 15 << 8 | 15 << 4 | 15); + /* second entry */ + pal[1] = (7 << 12 | 7 << 8 | 7 << 4 | 15); + } + break; + case GL_PALETTE4_RGB5_A1_OES: + case GL_PALETTE8_RGB5_A1_OES: + { + GLushort *pal = (GLushort *) palette; + /* first entry */ + pal[0] = (31 << 11 | 31 << 6 | 31 << 1 | 1); + /* second entry */ + pal[1] = (15 << 11 | 15 << 6 | 15 << 1 | 1); + } + break; + } + + image_size = cpal_formats[idx].size * cpal_formats[idx].num_entries; + indices = palette + image_size; + for (i = 0; i < SZ; i++) { + for (j = 0; j < SZ; j++) { + GLfloat d; + GLint index; + d = (i - SZ/2) * (i - SZ/2) + (j - SZ/2) * (j - SZ/2); + d = sqrt(d); + index = (d < SZ / 3) ? 0 : 1; + + if (cpal_formats[idx].num_entries == 16) { + /* 4-bit indices packed in GLubyte */ + packed_indices |= index << (4 * (1 - (j % 2))); + if (j % 2) { + *(indices + (i * SZ + j - 1) / 2) = packed_indices & 0xff; + packed_indices = 0; + image_size += 1; + } + } + else { + /* 8-bit indices */ + *(indices + i * SZ + j) = index; + image_size += 1; + } + } + } + + glActiveTexture(GL_TEXTURE0); /* unit 0 */ + glBindTexture(GL_TEXTURE_2D, 42); + glCompressedTexImage2D(GL_TEXTURE_2D, 0, internalFormat, SZ, SZ, 0, + image_size, palette); + + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, Filter); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, Filter); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); +#undef SZ + + return image_size; +} + + +static GLint make_texture(void) { #define SZ 64 @@ -199,6 +331,8 @@ make_texture(void) glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); #undef SZ + + return sizeof(image); } @@ -369,6 +503,19 @@ event_loop(Display *dpy, Window win, else if (code == XK_Down) { view_rotx -= 5.0; } + else if (code == XK_t) { + GLint size; + tex_format = (tex_format + 1) % (NUM_CPAL_FORMATS + 1); + if (tex_format < NUM_CPAL_FORMATS) { + size = make_cpal_texture(tex_format); + printf("Using %s (%d bytes)\n", + cpal_formats[tex_format].name, size); + } + else { + size = make_texture(); + printf("Using uncompressed texture (%d bytes)\n", size); + } + } else { r = XLookupString(&event.xkey, buffer, sizeof(buffer), NULL, NULL); |