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kitty/kitty/shaders.c
Kovid Goyal ffff343e3d
Work on rendering to FBO
2017-12-01 12:16:15 +05:30

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/*
* shaders.c
* Copyright (C) 2017 Kovid Goyal <kovid at kovidgoyal.net>
*
* Distributed under terms of the GPL3 license.
*/
#include "gl.h"
#include "fonts.h"
#include <sys/sysctl.h>
enum { CELL_PROGRAM, CELL_BG_PROGRAM, CELL_SPECIAL_PROGRAM, CELL_FG_PROGRAM, CURSOR_PROGRAM, BORDERS_PROGRAM, GRAPHICS_PROGRAM, BLIT_PROGRAM, NUM_PROGRAMS };
enum { SPRITE_MAP_UNIT, GRAPHICS_UNIT, BLIT_UNIT };
// Sprites {{{
typedef struct {
int xnum, ynum, x, y, z, last_num_of_layers, last_ynum;
GLuint texture_id;
GLenum texture_unit;
GLint max_texture_size, max_array_texture_layers;
} SpriteMap;
static SpriteMap sprite_map = { .xnum = 1, .ynum = 1, .last_num_of_layers = 1, .last_ynum = -1, .texture_unit = GL_TEXTURE0 };
static bool copy_image_warned = false;
static void
copy_image_sub_data(GLuint src_texture_id, GLuint dest_texture_id, unsigned int width, unsigned int height, unsigned int num_levels) {
if (!GLAD_GL_ARB_copy_image) {
// ARB_copy_image not available, do a slow roundtrip copy
if (!copy_image_warned) {
copy_image_warned = true;
fprintf(stderr, "WARNING: Your system's OpenGL implementation does not have glCopyImageSubData, falling back to a slower implementation.\n");
}
uint8_t *src = malloc(5 * width * height * num_levels);
if (src == NULL) { fatal("Out of memory."); }
uint8_t *dest = src + (4 * width * height * num_levels);
glBindTexture(GL_TEXTURE_2D_ARRAY, src_texture_id);
glGetTexImage(GL_TEXTURE_2D_ARRAY, 0, GL_RGBA, GL_UNSIGNED_BYTE, src);
glBindTexture(GL_TEXTURE_2D_ARRAY, dest_texture_id);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
for(size_t i = 0; i < width * height * num_levels; i++) dest[i] = src[4*i];
glTexSubImage3D(GL_TEXTURE_2D_ARRAY, 0, 0, 0, 0, width, height, num_levels, GL_RED, GL_UNSIGNED_BYTE, dest);
free(src);
} else {
glCopyImageSubData(src_texture_id, GL_TEXTURE_2D_ARRAY, 0, 0, 0, 0, dest_texture_id, GL_TEXTURE_2D_ARRAY, 0, 0, 0, 0, width, height, num_levels);
}
}
static void
realloc_sprite_texture() {
GLuint tex;
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D_ARRAY, tex);
// We use GL_NEAREST otherwise glyphs that touch the edge of the cell
// often show a border between cells
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
unsigned int xnum, ynum, z, znum, width, height, src_ynum;
sprite_tracker_current_layout(&xnum, &ynum, &z);
znum = z + 1;
width = xnum * global_state.cell_width; height = ynum * global_state.cell_height;
glTexStorage3D(GL_TEXTURE_2D_ARRAY, 1, GL_R8, width, height, znum);
if (sprite_map.texture_id) {
// need to re-alloc
src_ynum = MAX(1, sprite_map.last_ynum);
copy_image_sub_data(sprite_map.texture_id, tex, width, src_ynum * global_state.cell_height, sprite_map.last_num_of_layers);
glDeleteTextures(1, &sprite_map.texture_id);
}
glBindTexture(GL_TEXTURE_2D_ARRAY, 0);
sprite_map.last_num_of_layers = znum;
sprite_map.last_ynum = ynum;
sprite_map.texture_id = tex;
}
static inline void
ensure_sprite_map() {
if (!sprite_map.texture_id) realloc_sprite_texture();
// We have to rebind since we dont know if the texture was ever bound
// in the context of the current OSWindow
glActiveTexture(GL_TEXTURE0 + SPRITE_MAP_UNIT);
glBindTexture(GL_TEXTURE_2D_ARRAY, sprite_map.texture_id);
}
void
send_sprite_to_gpu(unsigned int x, unsigned int y, unsigned int z, uint8_t *buf) {
unsigned int xnum, ynum, znum;
sprite_tracker_current_layout(&xnum, &ynum, &znum);
if ((int)znum >= sprite_map.last_num_of_layers || (znum == 0 && (int)ynum > sprite_map.last_ynum)) realloc_sprite_texture();
glBindTexture(GL_TEXTURE_2D_ARRAY, sprite_map.texture_id);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
x *= global_state.cell_width; y *= global_state.cell_height;
glTexSubImage3D(GL_TEXTURE_2D_ARRAY, 0, x, y, z, global_state.cell_width, global_state.cell_height, 1, GL_RED, GL_UNSIGNED_BYTE, buf);
Py_DECREF(buf);
}
void
send_image_to_gpu(GLuint *tex_id, const void* data, GLsizei width, GLsizei height, bool is_opaque, bool is_4byte_aligned) {
if (!(*tex_id)) { glGenTextures(1, tex_id); }
glBindTexture(GL_TEXTURE_2D, *tex_id);
glPixelStorei(GL_UNPACK_ALIGNMENT, is_4byte_aligned ? 4 : 1);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, is_opaque ? GL_RGB : GL_RGBA, GL_UNSIGNED_BYTE, data);
}
static bool limits_updated = false;
static void
layout_sprite_map() {
if (!limits_updated) {
glGetIntegerv(GL_MAX_TEXTURE_SIZE, &(sprite_map.max_texture_size));
glGetIntegerv(GL_MAX_ARRAY_TEXTURE_LAYERS, &(sprite_map.max_array_texture_layers));
sprite_tracker_set_limits(sprite_map.max_texture_size, sprite_map.max_array_texture_layers);
limits_updated = true;
}
if (sprite_map.texture_id) { glDeleteTextures(1, &(sprite_map.texture_id)); sprite_map.texture_id = 0; }
realloc_sprite_texture();
}
static void
destroy_sprite_map() {
/* sprite_map_free(); */
if (sprite_map.texture_id) {
glDeleteTextures(1, &(sprite_map.texture_id));
sprite_map.texture_id = 0;
}
}
// }}}
// Cell {{{
typedef struct {
UniformBlock render_data;
ArrayInformation color_table;
} CellProgramLayout;
static CellProgramLayout cell_program_layouts[NUM_PROGRAMS];
static GLuint offscreen_framebuffer = 0;
static ssize_t blit_vertex_array;
static void
init_cell_program() {
for (int i = CELL_PROGRAM; i < CURSOR_PROGRAM; i++) {
cell_program_layouts[i].render_data.index = block_index(i, "CellRenderData");
cell_program_layouts[i].render_data.size = block_size(i, cell_program_layouts[i].render_data.index);
cell_program_layouts[i].color_table.size = get_uniform_information(i, "color_table[0]", GL_UNIFORM_SIZE);
cell_program_layouts[i].color_table.offset = get_uniform_information(i, "color_table[0]", GL_UNIFORM_OFFSET);
cell_program_layouts[i].color_table.stride = get_uniform_information(i, "color_table[0]", GL_UNIFORM_ARRAY_STRIDE);
}
// Sanity check to ensure the attribute location binding worked
#define C(p, name, expected) { int aloc = attrib_location(p, #name); if (aloc != expected && aloc != -1) fatal("The attribute location for %s is %d != %d in program: %d", #name, aloc, expected, p); }
for (int p = CELL_PROGRAM; p < CURSOR_PROGRAM; p++) {
C(p, colors, 0); C(p, sprite_coords, 1); C(p, is_selected, 2);
}
#undef C
glGenFramebuffers(1, &offscreen_framebuffer);
blit_vertex_array = create_vao();
}
#define CELL_BUFFERS enum { cell_data_buffer, selection_buffer, uniform_buffer };
ssize_t
create_cell_vao() {
ssize_t vao_idx = create_vao();
#define A(name, size, dtype, offset, stride) \
add_attribute_to_vao(CELL_PROGRAM, vao_idx, #name, \
/*size=*/size, /*dtype=*/dtype, /*stride=*/stride, /*offset=*/offset, /*divisor=*/1);
#define A1(name, size, dtype, offset) A(name, size, dtype, (void*)(offsetof(Cell, offset)), sizeof(Cell))
add_buffer_to_vao(vao_idx, GL_ARRAY_BUFFER);
A1(sprite_coords, 4, GL_UNSIGNED_SHORT, sprite_x);
A1(colors, 3, GL_UNSIGNED_INT, fg);
add_buffer_to_vao(vao_idx, GL_ARRAY_BUFFER);
A(is_selected, 1, GL_FLOAT, NULL, 0);
size_t bufnum = add_buffer_to_vao(vao_idx, GL_UNIFORM_BUFFER);
alloc_vao_buffer(vao_idx, cell_program_layouts[CELL_PROGRAM].render_data.size, bufnum, GL_STREAM_DRAW);
return vao_idx;
#undef A
#undef A1
}
ssize_t
create_graphics_vao() {
ssize_t vao_idx = create_vao();
add_buffer_to_vao(vao_idx, GL_ARRAY_BUFFER);
add_attribute_to_vao(GRAPHICS_PROGRAM, vao_idx, "src", 4, GL_FLOAT, 0, NULL, 0);
return vao_idx;
}
static inline void
cell_update_uniform_block(ssize_t vao_idx, Screen *screen, int uniform_buffer, GLfloat xstart, GLfloat ystart, GLfloat dx, GLfloat dy, CursorRenderInfo *cursor, bool inverted) {
struct CellRenderData {
GLfloat xstart, ystart, dx, dy, sprite_dx, sprite_dy, background_opacity;
GLuint default_fg, default_bg, highlight_fg, highlight_bg, cursor_color, url_color;
GLint color1, color2;
GLuint xnum, ynum, cursor_x, cursor_y, cursor_w, url_xl, url_yl, url_xr, url_yr;
};
static struct CellRenderData *rd;
// Send the uniform data
rd = (struct CellRenderData*)map_vao_buffer(vao_idx, uniform_buffer, GL_WRITE_ONLY);
if (UNLIKELY(screen->color_profile->dirty)) {
copy_color_table_to_buffer(screen->color_profile, (GLuint*)rd, cell_program_layouts[CELL_PROGRAM].color_table.offset / sizeof(GLuint), cell_program_layouts[CELL_PROGRAM].color_table.stride / sizeof(GLuint));
}
// Cursor position
if (cursor->is_visible && cursor->shape == CURSOR_BLOCK) {
rd->cursor_x = screen->cursor->x, rd->cursor_y = screen->cursor->y;
} else {
rd->cursor_x = screen->columns, rd->cursor_y = screen->lines;
}
rd->cursor_w = rd->cursor_x + MAX(1, screen_current_char_width(screen)) - 1;
rd->xnum = screen->columns; rd->ynum = screen->lines;
screen_url_range(screen, &rd->url_xl);
rd->xstart = xstart; rd->ystart = ystart; rd->dx = dx; rd->dy = dy;
unsigned int x, y, z;
sprite_tracker_current_layout(&x, &y, &z);
rd->sprite_dx = 1.0f / (float)x; rd->sprite_dy = 1.0f / (float)y;
rd->color1 = inverted & 1; rd->color2 = 1 - (inverted & 1);
rd->background_opacity = OPT(background_opacity);
#define COLOR(name) colorprofile_to_color(screen->color_profile, screen->color_profile->overridden.name, screen->color_profile->configured.name)
rd->default_fg = COLOR(default_fg); rd->default_bg = COLOR(default_bg); rd->highlight_fg = COLOR(highlight_fg); rd->highlight_bg = COLOR(highlight_bg);
#undef COLOR
rd->cursor_color = cursor->color; rd->url_color = OPT(url_color);
unmap_vao_buffer(vao_idx, uniform_buffer); rd = NULL;
}
static inline void
cell_prepare_to_render(ssize_t vao_idx, ssize_t gvao_idx, Screen *screen, GLfloat xstart, GLfloat ystart, GLfloat dx, GLfloat dy) {
size_t sz;
CELL_BUFFERS;
void *address;
ensure_sprite_map();
if (screen->scroll_changed || screen->is_dirty) {
sz = sizeof(Cell) * screen->lines * screen->columns;
address = alloc_and_map_vao_buffer(vao_idx, sz, cell_data_buffer, GL_STREAM_DRAW, GL_WRITE_ONLY);
screen_update_cell_data(screen, address, sz);
unmap_vao_buffer(vao_idx, cell_data_buffer); address = NULL;
}
if (screen_is_selection_dirty(screen)) {
sz = sizeof(GLfloat) * screen->lines * screen->columns;
address = alloc_and_map_vao_buffer(vao_idx, sz, selection_buffer, GL_STREAM_DRAW, GL_WRITE_ONLY);
screen_apply_selection(screen, address, sz);
unmap_vao_buffer(vao_idx, selection_buffer); address = NULL;
}
if (gvao_idx && grman_update_layers(screen->grman, screen->scrolled_by, xstart, ystart, dx, dy, screen->columns, screen->lines)) {
sz = sizeof(GLfloat) * 16 * screen->grman->count;
GLfloat *a = alloc_and_map_vao_buffer(gvao_idx, sz, 0, GL_STREAM_DRAW, GL_WRITE_ONLY);
for (size_t i = 0; i < screen->grman->count; i++, a += 16) memcpy(a, screen->grman->render_data[i].vertices, sizeof(screen->grman->render_data[0].vertices));
unmap_vao_buffer(gvao_idx, 0); a = NULL;
}
bool inverted = screen_invert_colors(screen);
cell_update_uniform_block(vao_idx, screen, uniform_buffer, xstart, ystart, dx, dy, &screen->cursor_render_info, inverted);
bind_vao_uniform_buffer(vao_idx, uniform_buffer, cell_program_layouts[CELL_PROGRAM].render_data.index);
bind_vertex_array(vao_idx);
}
static void
draw_graphics(ssize_t vao_idx, ssize_t gvao_idx, ImageRenderData *data, GLuint start, GLuint count) {
bind_vertex_array(gvao_idx);
bind_program(GRAPHICS_PROGRAM);
static bool graphics_constants_set = false;
if (!graphics_constants_set) {
glUniform1i(glGetUniformLocation(program_id(GRAPHICS_PROGRAM), "image"), GRAPHICS_UNIT);
graphics_constants_set = true;
}
glActiveTexture(GL_TEXTURE0 + GRAPHICS_UNIT);
GLuint base = 4 * start;
glEnable(GL_SCISSOR_TEST);
for (GLuint i=0; i < count;) {
ImageRenderData *rd = data + start + i;
glBindTexture(GL_TEXTURE_2D, rd->texture_id);
// You could reduce the number of draw calls by using
// glDrawArraysInstancedBaseInstance but Apple chose to abandon OpenGL
// before implementing it.
for (GLuint k=0; k < rd->group_count; k++, base += 4, i++) glDrawArrays(GL_TRIANGLE_FAN, base, 4);
}
glDisable(GL_SCISSOR_TEST);
bind_vertex_array(vao_idx);
}
static void
draw_all_cells(ssize_t vao_idx, ssize_t gvao_idx, Screen *screen) {
bind_program(CELL_PROGRAM);
glDrawArraysInstanced(GL_TRIANGLE_FAN, 0, 4, screen->lines * screen->columns);
if (screen->grman->count) {
glEnable(GL_BLEND);
draw_graphics(vao_idx, gvao_idx, screen->grman->render_data, 0, screen->grman->count);
glDisable(GL_BLEND);
}
}
static void
draw_cells_interleaved(ssize_t vao_idx, ssize_t gvao_idx, Screen *screen, OSWindow *os_window) {
if (!os_window->offscreen_texture_id) {
glGenTextures(1, &os_window->offscreen_texture_id);
glBindTexture(GL_TEXTURE_2D, os_window->offscreen_texture_id);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, os_window->viewport_width, os_window->viewport_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
}
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, offscreen_framebuffer);
glFramebufferTexture(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, os_window->offscreen_texture_id, 0);
/* if (glCheckFramebufferStatus(GL_DRAW_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) fatal("offscreen framebuffer not complete"); */
bind_program(CELL_BG_PROGRAM);
glDrawArraysInstanced(GL_TRIANGLE_FAN, 0, 4, screen->lines * screen->columns);
glEnable(GL_BLEND);
if (screen->grman->num_of_negative_refs) draw_graphics(vao_idx, gvao_idx, screen->grman->render_data, 0, screen->grman->num_of_negative_refs);
bind_program(CELL_SPECIAL_PROGRAM);
glDrawArraysInstanced(GL_TRIANGLE_FAN, 0, 4, screen->lines * screen->columns);
bind_program(CELL_FG_PROGRAM);
glDrawArraysInstanced(GL_TRIANGLE_FAN, 0, 4, screen->lines * screen->columns);
if (screen->grman->num_of_positive_refs) draw_graphics(vao_idx, gvao_idx, screen->grman->render_data, screen->grman->num_of_negative_refs, screen->grman->num_of_positive_refs);
glDisable(GL_BLEND);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
// Now render the framebuffer to the screen reversing alpha pre-multiplication
glEnable(GL_SCISSOR_TEST);
bind_program(BLIT_PROGRAM); bind_vertex_array(blit_vertex_array);
static bool blit_constants_set = false;
if (!blit_constants_set) {
glUniform1i(glGetUniformLocation(program_id(BLIT_PROGRAM), "image"), BLIT_UNIT);
blit_constants_set = true;
}
glActiveTexture(GL_TEXTURE0 + BLIT_UNIT);
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
glDisable(GL_SCISSOR_TEST);
}
void
draw_cells(ssize_t vao_idx, ssize_t gvao_idx, GLfloat xstart, GLfloat ystart, GLfloat dx, GLfloat dy, Screen *screen, OSWindow *os_window) {
cell_prepare_to_render(vao_idx, gvao_idx, screen, xstart, ystart, dx, dy);
GLfloat w = (GLfloat)screen->columns * dx, h = (GLfloat)screen->lines * dy;
#define SCALE(w, x) ((GLfloat)(os_window->viewport_##w) * (GLfloat)(x))
glScissor(
(GLint)(SCALE(width, (xstart + 1.0f) / 2.0f)),
(GLint)(SCALE(height, ((ystart - h) + 1.0f) / 2.0f)),
(GLsizei)(ceilf(SCALE(width, w / 2.0f))),
(GLsizei)(ceilf(SCALE(height, h / 2.0f)))
);
#undef SCALE
static bool cell_constants_set = false;
if (!cell_constants_set) {
bind_program(CELL_PROGRAM);
glUniform1i(glGetUniformLocation(program_id(CELL_PROGRAM), "sprites"), SPRITE_MAP_UNIT);
cell_constants_set = true;
}
bool needs_complex_rendering = screen->grman->num_of_negative_refs || (screen->grman->num_of_positive_refs && os_window->is_semi_transparent);
if (needs_complex_rendering) draw_cells_interleaved(vao_idx, gvao_idx, screen, os_window);
else draw_all_cells(vao_idx, gvao_idx, screen);
}
// }}}
// Cursor {{{
enum CursorUniforms { CURSOR_color, CURSOR_pos, NUM_CURSOR_UNIFORMS };
static GLint cursor_uniform_locations[NUM_CURSOR_UNIFORMS] = {0};
static ssize_t cursor_vertex_array;
static void
init_cursor_program() {
Program *p = programs + CURSOR_PROGRAM;
int left = NUM_CURSOR_UNIFORMS;
cursor_vertex_array = create_vao();
for (int i = 0; i < p->num_of_uniforms; i++, left--) {
#define SET_LOC(which) if (strcmp(p->uniforms[i].name, #which) == 0) cursor_uniform_locations[CURSOR_##which] = p->uniforms[i].location
SET_LOC(color);
else SET_LOC(pos);
else { fatal("Unknown uniform in cursor program"); }
}
if (left) { fatal("Left over uniforms in cursor program"); }
#undef SET_LOC
}
void
draw_cursor(CursorRenderInfo *cursor, bool is_focused) {
bind_program(CURSOR_PROGRAM); bind_vertex_array(cursor_vertex_array);
glUniform3f(cursor_uniform_locations[CURSOR_color], ((cursor->color >> 16) & 0xff) / 255.0, ((cursor->color >> 8) & 0xff) / 255.0, (cursor->color & 0xff) / 255.0);
glUniform4f(cursor_uniform_locations[CURSOR_pos], cursor->left, cursor->top, cursor->right, cursor->bottom);
glDrawArrays(is_focused ? GL_TRIANGLE_FAN : GL_LINE_LOOP, 0, 4);
unbind_vertex_array(); unbind_program();
}
// }}}
// Borders {{{
enum BorderUniforms { BORDER_viewport, BORDER_background_opacity, NUM_BORDER_UNIFORMS };
static GLint border_uniform_locations[NUM_BORDER_UNIFORMS] = {0};
static void
init_borders_program() {
Program *p = programs + BORDERS_PROGRAM;
int left = NUM_BORDER_UNIFORMS;
for (int i = 0; i < p->num_of_uniforms; i++, left--) {
#define SET_LOC(which) (strcmp(p->uniforms[i].name, #which) == 0) border_uniform_locations[BORDER_##which] = p->uniforms[i].location
if SET_LOC(viewport);
else if SET_LOC(background_opacity);
else { fatal("Unknown uniform in borders program: %s", p->uniforms[i].name); return; }
}
if (left) { fatal("Left over uniforms in borders program"); return; }
#undef SET_LOC
}
ssize_t
create_border_vao() {
ssize_t vao_idx = create_vao();
add_buffer_to_vao(vao_idx, GL_ARRAY_BUFFER);
add_attribute_to_vao(BORDERS_PROGRAM, vao_idx, "rect",
/*size=*/4, /*dtype=*/GL_UNSIGNED_INT, /*stride=*/sizeof(GLuint)*5, /*offset=*/0, /*divisor=*/1);
add_attribute_to_vao(BORDERS_PROGRAM, vao_idx, "rect_color",
/*size=*/1, /*dtype=*/GL_UNSIGNED_INT, /*stride=*/sizeof(GLuint)*5, /*offset=*/(void*)(sizeof(GLuint)*4), /*divisor=*/1);
return vao_idx;
}
void
draw_borders(ssize_t vao_idx, unsigned int num_border_rects, BorderRect *rect_buf, bool rect_data_is_dirty, uint32_t viewport_width, uint32_t viewport_height) {
if (num_border_rects) {
if (rect_data_is_dirty) {
size_t sz = sizeof(GLuint) * 5 * num_border_rects;
void *borders_buf_address = alloc_and_map_vao_buffer(vao_idx, sz, 0, GL_STATIC_DRAW, GL_WRITE_ONLY);
if (borders_buf_address) memcpy(borders_buf_address, rect_buf, sz);
unmap_vao_buffer(vao_idx, 0);
}
bind_program(BORDERS_PROGRAM);
static bool constants_set = false;
if (!constants_set) {
constants_set = true;
glUniform1f(border_uniform_locations[BORDER_background_opacity], OPT(background_opacity));
}
glUniform2ui(border_uniform_locations[BORDER_viewport], viewport_width, viewport_height);
bind_vertex_array(vao_idx);
glDrawArraysInstanced(GL_TRIANGLE_FAN, 0, 4, num_border_rects);
unbind_vertex_array();
unbind_program();
}
}
// }}}
// Python API {{{
static PyObject*
compile_program(PyObject UNUSED *self, PyObject *args) {
const char *vertex_shader, *fragment_shader;
int which;
GLuint vertex_shader_id = 0, fragment_shader_id = 0;
if (!PyArg_ParseTuple(args, "iss", &which, &vertex_shader, &fragment_shader)) return NULL;
if (which < 0 || which >= NUM_PROGRAMS) { PyErr_Format(PyExc_ValueError, "Unknown program: %d", which); return NULL; }
if (programs[which].id != 0) { PyErr_SetString(PyExc_ValueError, "program already compiled"); return NULL; }
programs[which].id = glCreateProgram();
vertex_shader_id = compile_shader(GL_VERTEX_SHADER, vertex_shader);
fragment_shader_id = compile_shader(GL_FRAGMENT_SHADER, fragment_shader);
glAttachShader(programs[which].id, vertex_shader_id);
glAttachShader(programs[which].id, fragment_shader_id);
glLinkProgram(programs[which].id);
GLint ret = GL_FALSE;
glGetProgramiv(programs[which].id, GL_LINK_STATUS, &ret);
if (ret != GL_TRUE) {
GLsizei len;
glGetProgramInfoLog(programs[which].id, sizeof(glbuf), &len, glbuf);
fprintf(stderr, "Failed to compile GLSL shader!\n%s", glbuf);
PyErr_SetString(PyExc_ValueError, "Failed to compile shader");
goto end;
}
init_uniforms(which);
end:
if (vertex_shader_id != 0) glDeleteShader(vertex_shader_id);
if (fragment_shader_id != 0) glDeleteShader(fragment_shader_id);
if (PyErr_Occurred()) { glDeleteProgram(programs[which].id); programs[which].id = 0; return NULL;}
return Py_BuildValue("I", programs[which].id);
Py_RETURN_NONE;
}
#define PYWRAP0(name) static PyObject* py##name(PyObject UNUSED *self)
#define PYWRAP1(name) static PyObject* py##name(PyObject UNUSED *self, PyObject *args)
#define PYWRAP2(name) static PyObject* py##name(PyObject UNUSED *self, PyObject *args, PyObject *kw)
#define PA(fmt, ...) if(!PyArg_ParseTuple(args, fmt, __VA_ARGS__)) return NULL;
#define ONE_INT(name) PYWRAP1(name) { name(PyLong_AsSsize_t(args)); Py_RETURN_NONE; }
#define TWO_INT(name) PYWRAP1(name) { int a, b; PA("ii", &a, &b); name(a, b); Py_RETURN_NONE; }
#define NO_ARG(name) PYWRAP0(name) { name(); Py_RETURN_NONE; }
#define NO_ARG_INT(name) PYWRAP0(name) { return PyLong_FromSsize_t(name()); }
ONE_INT(bind_program)
NO_ARG(unbind_program)
PYWRAP0(create_vao) {
int ans = create_vao();
if (ans < 0) return NULL;
return Py_BuildValue("i", ans);
}
ONE_INT(bind_vertex_array)
NO_ARG(unbind_vertex_array)
TWO_INT(unmap_vao_buffer)
NO_ARG(init_cursor_program)
NO_ARG(init_borders_program)
NO_ARG(init_cell_program)
NO_ARG(destroy_sprite_map)
NO_ARG(layout_sprite_map)
#define M(name, arg_type) {#name, (PyCFunction)name, arg_type, NULL}
#define MW(name, arg_type) {#name, (PyCFunction)py##name, arg_type, NULL}
static PyMethodDef module_methods[] = {
M(compile_program, METH_VARARGS),
MW(create_vao, METH_NOARGS),
MW(bind_vertex_array, METH_O),
MW(unbind_vertex_array, METH_NOARGS),
MW(unmap_vao_buffer, METH_VARARGS),
MW(bind_program, METH_O),
MW(unbind_program, METH_NOARGS),
MW(init_cursor_program, METH_NOARGS),
MW(init_borders_program, METH_NOARGS),
MW(init_cell_program, METH_NOARGS),
MW(layout_sprite_map, METH_VARARGS),
MW(destroy_sprite_map, METH_NOARGS),
{NULL, NULL, 0, NULL} /* Sentinel */
};
bool
init_shaders(PyObject *module) {
#define C(x) if (PyModule_AddIntConstant(module, #x, x) != 0) { PyErr_NoMemory(); return false; }
C(CELL_PROGRAM); C(CELL_BG_PROGRAM); C(CELL_SPECIAL_PROGRAM); C(CELL_FG_PROGRAM); C(CURSOR_PROGRAM); C(BORDERS_PROGRAM); C(GRAPHICS_PROGRAM); C(BLIT_PROGRAM);
C(GLSL_VERSION);
C(GL_VERSION);
C(GL_VENDOR);
C(GL_SHADING_LANGUAGE_VERSION);
C(GL_RENDERER);
C(GL_TRIANGLE_FAN); C(GL_TRIANGLE_STRIP); C(GL_TRIANGLES); C(GL_LINE_LOOP);
C(GL_COLOR_BUFFER_BIT);
C(GL_VERTEX_SHADER);
C(GL_FRAGMENT_SHADER);
C(GL_TRUE);
C(GL_FALSE);
C(GL_COMPILE_STATUS);
C(GL_LINK_STATUS);
C(GL_TEXTURE0); C(GL_TEXTURE1); C(GL_TEXTURE2); C(GL_TEXTURE3); C(GL_TEXTURE4); C(GL_TEXTURE5); C(GL_TEXTURE6); C(GL_TEXTURE7); C(GL_TEXTURE8);
C(GL_MAX_ARRAY_TEXTURE_LAYERS); C(GL_TEXTURE_BINDING_BUFFER); C(GL_MAX_TEXTURE_BUFFER_SIZE);
C(GL_MAX_TEXTURE_SIZE);
C(GL_TEXTURE_2D_ARRAY);
C(GL_LINEAR); C(GL_CLAMP_TO_EDGE); C(GL_NEAREST);
C(GL_TEXTURE_MIN_FILTER); C(GL_TEXTURE_MAG_FILTER);
C(GL_TEXTURE_WRAP_S); C(GL_TEXTURE_WRAP_T);
C(GL_UNPACK_ALIGNMENT);
C(GL_R8); C(GL_RED); C(GL_UNSIGNED_BYTE); C(GL_UNSIGNED_SHORT); C(GL_R32UI); C(GL_RGB32UI); C(GL_RGBA);
C(GL_TEXTURE_BUFFER); C(GL_STATIC_DRAW); C(GL_STREAM_DRAW); C(GL_DYNAMIC_DRAW);
C(GL_SRC_ALPHA); C(GL_ONE_MINUS_SRC_ALPHA);
C(GL_WRITE_ONLY); C(GL_READ_ONLY); C(GL_READ_WRITE);
C(GL_BLEND); C(GL_FLOAT); C(GL_UNSIGNED_INT); C(GL_ARRAY_BUFFER); C(GL_UNIFORM_BUFFER);
#undef C
if (PyModule_AddFunctions(module, module_methods) != 0) return false;
return true;
}
// }}}
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