Skip to content

Commit

Permalink
Cleanup checker shader code.
Browse files Browse the repository at this point in the history 
Size and colors can now be set outside the shader code.
  • Loading branch information
@zas
zas committed Sep 4, 2012
1 parent 8693961 commit bae504c
Showing 1 changed file with 88 additions and 56 deletions.
144 changes: 88 additions & 56 deletions src/renderer-clutter.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -118,63 +118,83 @@ struct _RendererClutterAreaParam {
gint h;
};

typedef struct _RendererClutterShaderInfo RendererClutterShaderInfo;
struct _RendererClutterShaderInfo {
float checkersize;
float checkercolor0[3];
float checkercolor1[3];
};

#define CLUT_SIZE 32

static void rc_set_shader(CoglHandle material)
static void rc_set_shader(CoglHandle material, const RendererClutterShaderInfo *shaderInfo)
{
CoglHandle shader;
CoglHandle program;
gint uniform_no;
shader = cogl_create_shader (COGL_SHADER_TYPE_FRAGMENT);
cogl_shader_source (shader,
"vec3 checker(vec2 texc, vec3 color0, vec3 color1) \n"
"{ \n"
" if (mod(floor(texc.x) + floor(texc.y), 2.0) == 0.0) \n"
" return color0; \n"
" else \n"
" return color1; \n"
"} \n"
" \n"
"uniform sampler2D tex; \n"
"uniform sampler3D clut; \n"
"uniform float scale; \n"
"uniform float offset; \n"
" \n"
"void main(void) \n"
"{ \n"
" vec3 bg = checker(gl_FragCoord.xy / 16.0, vec3(0.6, 0.6, 0.6), vec3(0.4, 0.4, 0.4)); \n"
" vec4 img4 = texture2D(tex, gl_TexCoord[0].xy); \n"
" vec3 img3 = img4.bgr; \n"
" img3 = img3 * scale + offset; \n"
" img3 = texture3D(clut, img3).rgb; \n"
" \n"
" gl_FragColor = vec4(img3 * img4.a + bg * (1.0 - img4.a), 1.0); \n"
"} \n"
);
cogl_shader_compile(shader);
gchar *err = cogl_shader_get_info_log(shader);
DEBUG_0("%s\n",err);
g_free(err);

program = cogl_create_program ();
cogl_program_attach_shader (program, shader);
cogl_handle_unref (shader);
cogl_program_link (program);

uniform_no = cogl_program_get_uniform_location (program, "tex");
cogl_program_set_uniform_1i (program, uniform_no, 0);

uniform_no = cogl_program_get_uniform_location (program, "clut");
cogl_program_set_uniform_1i (program, uniform_no, 1);

uniform_no = cogl_program_get_uniform_location (program, "scale");
cogl_program_set_uniform_1f (program, uniform_no, (double) (CLUT_SIZE - 1) / CLUT_SIZE);

uniform_no = cogl_program_get_uniform_location (program, "offset");
cogl_program_set_uniform_1f (program, uniform_no, 1.0 / (2 * CLUT_SIZE));

cogl_material_set_user_program (material, program);
cogl_handle_unref (program);
CoglHandle shader;
CoglHandle program;
gint uniform_no;

shader = cogl_create_shader (COGL_SHADER_TYPE_FRAGMENT);
cogl_shader_source (shader,
"vec3 checker(vec2 texc, vec3 color0, vec3 color1) \n"
"{ \n"
" if (mod(floor(texc.x) + floor(texc.y), 2.0) == 0.0) \n"
" return color0; \n"
" else \n"
" return color1; \n"
"} \n"
" \n"
"uniform sampler2D tex; \n"
"uniform sampler3D clut; \n"
"uniform float scale; \n"
"uniform float offset; \n"
"uniform float checkersize; \n"
"uniform vec3 color0; \n"
"uniform vec3 color1; \n"
" \n"
"void main(void) \n"
"{ \n"
" vec3 bg = checker(gl_FragCoord.xy / checkersize, color0, color1); \n"
" vec4 img4 = texture2D(tex, gl_TexCoord[0].xy); \n"
" vec3 img3 = img4.bgr; \n"
" img3 = img3 * scale + offset; \n"
" img3 = texture3D(clut, img3).rgb; \n"
" \n"
" gl_FragColor = vec4(img3 * img4.a + bg * (1.0 - img4.a), 1.0); \n"
"} \n"
);
cogl_shader_compile(shader);
gchar *err = cogl_shader_get_info_log(shader);
DEBUG_0("%s\n",err);
g_free(err);

program = cogl_create_program ();
cogl_program_attach_shader (program, shader);
cogl_handle_unref (shader);
cogl_program_link (program);

uniform_no = cogl_program_get_uniform_location (program, "tex");
cogl_program_set_uniform_1i (program, uniform_no, 0);

uniform_no = cogl_program_get_uniform_location (program, "clut");
cogl_program_set_uniform_1i (program, uniform_no, 1);

uniform_no = cogl_program_get_uniform_location (program, "scale");
cogl_program_set_uniform_1f (program, uniform_no, (double) (CLUT_SIZE - 1) / CLUT_SIZE);

uniform_no = cogl_program_get_uniform_location (program, "offset");
cogl_program_set_uniform_1f (program, uniform_no, 1.0 / (2 * CLUT_SIZE));

uniform_no = cogl_program_get_uniform_location (program, "checkersize");
cogl_program_set_uniform_1f (program, uniform_no, shaderInfo->checkersize);

uniform_no = cogl_program_get_uniform_location (program, "color0");
cogl_program_set_uniform_float (program, uniform_no, 3, 1, shaderInfo->checkercolor0);

uniform_no = cogl_program_get_uniform_location (program, "color1");
cogl_program_set_uniform_float (program, uniform_no, 3, 1, shaderInfo->checkercolor1);

cogl_material_set_user_program (material, program);
cogl_handle_unref (program);
}


Expand Down Expand Up @@ -796,6 +816,17 @@ static void rc_free(void *renderer)
g_free(rc);
}

/* initialize shader for transparency background checker */
static void renderer_clutter_init_checker_shader(RendererClutter *rc)
{
const RendererClutterShaderInfo info = {
16.0, /* checker size */
{0.6, 0.6, 0.6}, /* color 0 */
{0.4, 0.4, 0.4} /* color 1 */
};
rc_set_shader(clutter_texture_get_cogl_material(CLUTTER_TEXTURE(rc->texture)), &info);
}

RendererFuncs *renderer_clutter_new(PixbufRenderer *pr)
{
RendererClutter *rc = g_new0(RendererClutter, 1);
Expand Down Expand Up @@ -851,8 +882,9 @@ RendererFuncs *renderer_clutter_new(PixbufRenderer *pr)

rc->texture = clutter_texture_new ();
clutter_container_add_actor(CLUTTER_CONTAINER(rc->group), rc->texture);
rc_set_shader(clutter_texture_get_cogl_material(CLUTTER_TEXTURE(rc->texture)));
g_object_ref(G_OBJECT(rc->widget));

renderer_clutter_init_checker_shader(rc);
g_object_ref(G_OBJECT(rc->widget));

gtk_widget_show(rc->widget);
return (RendererFuncs *) rc;
Expand Down

0 comments on commit bae504c

Please sign in to comment.