mirror of
https://gitlab.gnome.org/GNOME/gtk.git
synced 2024-12-25 21:21:21 +00:00
gdk_gl_texture_quad: Use shaders to texture things
This is the modern way OpenGL works, and using it will let us switch to a core context for the paint context, and work on OpenGL ES 2.0.
This commit is contained in:
Alexander Larsson
parent
c78e7e7f17
commit
e417b18373
196
gdk/gdkgl.c
196
gdk/gdkgl.c
@ -35,25 +35,193 @@ gdk_cairo_surface_mark_as_direct (cairo_surface_t *surface,
|
||||
g_object_ref (window), g_object_unref);
|
||||
}
|
||||
|
||||
static const char *
|
||||
get_vertex_type_name (int type)
|
||||
{
|
||||
switch (type)
|
||||
{
|
||||
case GL_VERTEX_SHADER:
|
||||
return "vertex";
|
||||
case GL_GEOMETRY_SHADER:
|
||||
return "geometry";
|
||||
case GL_FRAGMENT_SHADER:
|
||||
return "fragment";
|
||||
}
|
||||
return "unknown";
|
||||
}
|
||||
|
||||
guint
|
||||
create_shader (int type, const char const *code)
|
||||
{
|
||||
guint shader;
|
||||
int status;
|
||||
|
||||
shader = glCreateShader (type);
|
||||
glShaderSource (shader, 1, &code, NULL);
|
||||
glCompileShader (shader);
|
||||
|
||||
glGetShaderiv (shader, GL_COMPILE_STATUS, &status);
|
||||
if (status == GL_FALSE)
|
||||
{
|
||||
int log_len;
|
||||
char *buffer;
|
||||
|
||||
glGetShaderiv (shader, GL_INFO_LOG_LENGTH, &log_len);
|
||||
|
||||
buffer = g_malloc (log_len + 1);
|
||||
glGetShaderInfoLog (shader, log_len, NULL, buffer);
|
||||
|
||||
g_warning ("Compile failure in %s shader:\n%s\n", get_vertex_type_name (type), buffer);
|
||||
g_free (buffer);
|
||||
|
||||
glDeleteShader (shader);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
return shader;
|
||||
}
|
||||
|
||||
guint
|
||||
make_program (const char const *vertex_shader_code, const char const *fragment_shader_code)
|
||||
{
|
||||
guint program, vertex_shader, fragment_shader;
|
||||
int status;
|
||||
|
||||
vertex_shader = create_shader (GL_VERTEX_SHADER, vertex_shader_code);
|
||||
if (vertex_shader == 0)
|
||||
return 0;
|
||||
|
||||
fragment_shader = create_shader (GL_FRAGMENT_SHADER, fragment_shader_code);
|
||||
if (fragment_shader == 0)
|
||||
{
|
||||
glDeleteShader (vertex_shader);
|
||||
return 0;
|
||||
}
|
||||
|
||||
program = glCreateProgram ();
|
||||
glAttachShader (program, vertex_shader);
|
||||
glAttachShader (program, fragment_shader);
|
||||
|
||||
glLinkProgram (program);
|
||||
|
||||
glDeleteShader (vertex_shader);
|
||||
glDeleteShader (fragment_shader);
|
||||
|
||||
glGetProgramiv (program, GL_LINK_STATUS, &status);
|
||||
if (status == GL_FALSE)
|
||||
{
|
||||
int log_len;
|
||||
char *buffer;
|
||||
|
||||
glGetProgramiv (program, GL_INFO_LOG_LENGTH, &log_len);
|
||||
|
||||
buffer = g_malloc (log_len + 1);
|
||||
glGetProgramInfoLog (program, log_len, NULL, buffer);
|
||||
g_warning ("Linker failure: %s\n", buffer);
|
||||
g_free (buffer);
|
||||
|
||||
glDeleteProgram (program);
|
||||
return 0;
|
||||
}
|
||||
|
||||
return program;
|
||||
}
|
||||
|
||||
static void
|
||||
bind_vao (GdkGLContextPaintData *paint_data)
|
||||
{
|
||||
if (paint_data->vertex_array_object == 0)
|
||||
{
|
||||
glGenVertexArrays (1, &paint_data->vertex_array_object);
|
||||
/* ATM we only use one VAO, so always bind it */
|
||||
glBindVertexArray (paint_data->vertex_array_object);
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
use_texture_program (GdkGLContextPaintData *paint_data)
|
||||
{
|
||||
const char *vertex_shader_code =
|
||||
"#version 120\n"
|
||||
"uniform sampler2D map;"
|
||||
"attribute vec2 position;\n"
|
||||
"attribute vec2 uv;\n"
|
||||
"varying vec2 vUv;\n"
|
||||
"void main() {\n"
|
||||
" gl_Position = vec4(position, 0, 1);\n"
|
||||
" vUv = uv;\n"
|
||||
"}\n";
|
||||
const char *fragment_shader_code =
|
||||
"#version 120\n"
|
||||
"varying vec2 vUv;\n"
|
||||
"uniform sampler2D map;\n"
|
||||
"void main() {\n"
|
||||
" gl_FragColor = texture2D (map, vUv);\n"
|
||||
"}\n";
|
||||
|
||||
if (paint_data->texture_quad_program == 0)
|
||||
{
|
||||
paint_data->texture_quad_program = make_program (vertex_shader_code, fragment_shader_code);
|
||||
paint_data->texture_quad_program_position_location = glGetAttribLocation (paint_data->texture_quad_program, "position");
|
||||
paint_data->texture_quad_program_uv_location = glGetAttribLocation (paint_data->texture_quad_program, "uv");
|
||||
}
|
||||
|
||||
if (paint_data->current_program != paint_data->texture_quad_program)
|
||||
{
|
||||
glUseProgram (paint_data->texture_quad_program);
|
||||
paint_data->current_program = paint_data->texture_quad_program;
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
gdk_gl_texture_quad (float x1, float y1,
|
||||
gdk_gl_texture_quad (GdkGLContext *paint_context,
|
||||
float x1, float y1,
|
||||
float x2, float y2,
|
||||
float u1, float v1,
|
||||
float u2, float v2)
|
||||
{
|
||||
glBegin (GL_QUADS);
|
||||
glTexCoord2f (u1, v2);
|
||||
glVertex2f (x1, y2);
|
||||
GdkGLContextPaintData *paint_data = gdk_gl_context_get_paint_data (paint_context);;
|
||||
GdkWindow *window = gdk_gl_context_get_window (paint_context);
|
||||
float w = gdk_window_get_width (window);
|
||||
float h = gdk_window_get_height (window);
|
||||
float vertex_buffer_data[] = {
|
||||
(x2 * 2) / w - 1, (y1 * 2) / h - 1,
|
||||
(x2 * 2) / w - 1, (y2 * 2) / h - 1,
|
||||
(x1 * 2) / w - 1, (y2 * 2) / h - 1,
|
||||
(x1 * 2) / w - 1, (y1 * 2) / h - 1,
|
||||
};
|
||||
float uv_buffer_data[] = {
|
||||
u2, v1,
|
||||
u2, v2,
|
||||
u1, v2,
|
||||
u1, v1,
|
||||
};
|
||||
|
||||
glTexCoord2f (u2, v2);
|
||||
glVertex2f (x2, y2);
|
||||
bind_vao (paint_data);
|
||||
|
||||
glTexCoord2f (u2, v1);
|
||||
glVertex2f (x2, y1);
|
||||
if (paint_data->tmp_vertex_buffer == 0)
|
||||
glGenBuffers(1, &paint_data->tmp_vertex_buffer);
|
||||
|
||||
glTexCoord2f (u1, v1);
|
||||
glVertex2f (x1, y1);
|
||||
glEnd();
|
||||
if (paint_data->tmp_uv_buffer == 0)
|
||||
glGenBuffers(1, &paint_data->tmp_uv_buffer);
|
||||
|
||||
use_texture_program (paint_data);
|
||||
|
||||
glActiveTexture (GL_TEXTURE0);
|
||||
glEnableVertexAttribArray (0);
|
||||
glBindBuffer (GL_ARRAY_BUFFER, paint_data->tmp_vertex_buffer);
|
||||
glBufferData (GL_ARRAY_BUFFER, sizeof(vertex_buffer_data), vertex_buffer_data, GL_STREAM_DRAW);
|
||||
glVertexAttribPointer (paint_data->texture_quad_program_position_location,
|
||||
2, GL_FLOAT, GL_FALSE, 0, NULL);
|
||||
glEnableVertexAttribArray (1);
|
||||
glBindBuffer (GL_ARRAY_BUFFER, paint_data->tmp_uv_buffer);
|
||||
glBufferData (GL_ARRAY_BUFFER, sizeof(uv_buffer_data), uv_buffer_data, GL_STREAM_DRAW);
|
||||
glVertexAttribPointer (paint_data->texture_quad_program_uv_location,
|
||||
2, GL_FLOAT, GL_FALSE, 0, NULL);
|
||||
glDrawArrays (GL_TRIANGLE_FAN, 0, 4);
|
||||
glDisableVertexAttribArray (0);
|
||||
glDisableVertexAttribArray (1);
|
||||
}
|
||||
|
||||
|
||||
@ -328,7 +496,8 @@ gdk_cairo_draw_from_gl (cairo_t *cr,
|
||||
int clipped_src_x = x + (dest.x - dx * window_scale);
|
||||
int clipped_src_y = y + (height - dest.height - (dest.y - dy * window_scale));
|
||||
|
||||
gdk_gl_texture_quad (dest.x, FLIP_Y(dest.y),
|
||||
gdk_gl_texture_quad (paint_context,
|
||||
dest.x, FLIP_Y(dest.y),
|
||||
dest.x + dest.width, FLIP_Y(dest.y + dest.height),
|
||||
clipped_src_x / (float)texture_width, (clipped_src_y + dest.height) / (float)texture_height,
|
||||
(clipped_src_x + dest.width) / (float)texture_width, clipped_src_y / (float)texture_height);
|
||||
@ -507,7 +676,8 @@ gdk_gl_texture_from_surface (cairo_surface_t *surface,
|
||||
vmax = 1.0;
|
||||
}
|
||||
|
||||
gdk_gl_texture_quad (rect.x * window_scale, FLIP_Y(rect.y) * window_scale,
|
||||
gdk_gl_texture_quad (paint_context,
|
||||
rect.x * window_scale, FLIP_Y(rect.y) * window_scale,
|
||||
(rect.x + rect.width) * window_scale, FLIP_Y(rect.y + rect.height) * window_scale,
|
||||
0, 0,
|
||||
umax, vmax);
|
||||
|
||||
@ -57,7 +57,14 @@ void gdk_gl_context_end_frame (GdkGLContext *context,
|
||||
|
||||
|
||||
typedef struct {
|
||||
guint vertex_array_object;
|
||||
guint tmp_framebuffer;
|
||||
guint tmp_vertex_buffer;
|
||||
guint tmp_uv_buffer;
|
||||
guint current_program;
|
||||
guint texture_quad_program;
|
||||
guint texture_quad_program_position_location;
|
||||
guint texture_quad_program_uv_location;
|
||||
} GdkGLContextPaintData;
|
||||
|
||||
GdkGLContextPaintData *gdk_gl_context_get_paint_data (GdkGLContext *context);
|
||||
|
||||
@ -341,7 +341,8 @@ gboolean _gdk_cairo_surface_extents (cairo_surface_t *surface,
|
||||
GdkRectangle *extents);
|
||||
void gdk_gl_texture_from_surface (cairo_surface_t *surface,
|
||||
cairo_region_t *region);
|
||||
void gdk_gl_texture_quad (float x1, float y1,
|
||||
void gdk_gl_texture_quad (GdkGLContext *paint_context,
|
||||
float x1, float y1,
|
||||
float x2, float y2,
|
||||
float u1, float v1,
|
||||
float u2, float v2);
|
||||
|
||||
@ -466,7 +466,8 @@ gdk_x11_gl_context_texture_from_surface (GdkGLContext *paint_context,
|
||||
vscale = 1.0 / cairo_xlib_surface_get_height (surface);
|
||||
}
|
||||
|
||||
gdk_gl_texture_quad (rect.x * window_scale, FLIP_Y(rect.y) * window_scale,
|
||||
gdk_gl_texture_quad (paint_context,
|
||||
rect.x * window_scale, FLIP_Y(rect.y) * window_scale,
|
||||
(rect.x + rect.width) * window_scale, FLIP_Y(rect.y + rect.height) * window_scale,
|
||||
uscale * src_x, vscale * src_y,
|
||||
uscale * (src_x + src_width), vscale * (src_y + src_height));
|
||||
|
||||
Loading…
Reference in New Issue
Block a user