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gl_common: use texelFetch 

This relieves us from the need to normalize texture coordinates.

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
This commit is contained in:
Yuxuan Shui 2019-07-14 16:21:22 +01:00
parent 8a794e0ce1
commit ad30b4f826
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GPG Key ID: 37C999F617EA1A47
2 changed files with 34 additions and 57 deletions
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89
src/backend/gl/gl_common.c
View File

@ -192,7 +192,7 @@ static void gl_free_prog_main(gl_win_shader_t *pprogram) {
* @param reg_visible ignored
*/
static void _gl_compose(backend_t *base, struct gl_image *img, GLuint target,
GLfloat *coord, GLuint *indices, int nrects) {
GLint *coord, GLuint *indices, int nrects) {
struct gl_data *gd = (void *)base;
if (!img || !img->inner->texture) {
@ -242,9 +242,9 @@ static void _gl_compose(backend_t *base, struct gl_image *img, GLuint target,
glEnableVertexAttribArray(vert_coord_loc);
glEnableVertexAttribArray(vert_in_texcoord_loc);
glVertexAttribPointer(vert_coord_loc, 2, GL_FLOAT, GL_FALSE, sizeof(GLfloat) * 4, NULL);
glVertexAttribPointer(vert_in_texcoord_loc, 2, GL_FLOAT, GL_FALSE,
sizeof(GLfloat) * 4, (void *)(sizeof(GLfloat) * 2));
glVertexAttribPointer(vert_coord_loc, 2, GL_INT, GL_FALSE, sizeof(GLint) * 4, NULL);
glVertexAttribPointer(vert_in_texcoord_loc, 2, GL_INT, GL_FALSE,
sizeof(GLint) * 4, (void *)(sizeof(GLint) * 2));
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, target);
glDrawElements(GL_TRIANGLES, nrects * 6, GL_UNSIGNED_INT, NULL);
glDisableVertexAttribArray(vert_coord_loc);
@ -282,7 +282,7 @@ static void _gl_compose(backend_t *base, struct gl_image *img, GLuint target,
/// @param[out] coord, indices output
static void x_rect_to_coords(int nrects, const rect_t *rects, int dst_x, int dst_y,
int width, int height, int root_height, bool y_inverted,
GLfloat *coord, GLuint *indices) {
GLint *coord, GLuint *indices) {
dst_y = root_height - dst_y;
if (y_inverted) {
dst_y -= height;
@ -296,35 +296,27 @@ static void x_rect_to_coords(int nrects, const rect_t *rects, int dst_x, int dst
// Calculate texture coordinates
// (texture_x1, texture_y1), texture coord for the _bottom left_ corner
auto texture_x1 = (GLfloat)(crect.x1 - dst_x);
auto texture_y1 = (GLfloat)(crect.y2 - dst_y);
auto texture_x2 = texture_x1 + (GLfloat)(crect.x2 - crect.x1);
auto texture_y2 = texture_y1 + (GLfloat)(crect.y1 - crect.y2);
GLint texture_x1 = crect.x1 - dst_x, texture_y1 = crect.y2 - dst_y,
texture_x2 = texture_x1 + (crect.x2 - crect.x1),
texture_y2 = texture_y1 + (crect.y1 - crect.y2);
// X pixmaps might be Y inverted, invert the texture coordinates
if (y_inverted) {
texture_y1 = (GLfloat)height - texture_y1;
texture_y2 = (GLfloat)height - texture_y2;
texture_y1 = height - texture_y1;
texture_y2 = height - texture_y2;
}
// GL_TEXTURE_2D coordinates are normalized
// TODO use texelFetch
texture_x1 /= (GLfloat)width;
texture_y1 /= (GLfloat)height;
texture_x2 /= (GLfloat)width;
texture_y2 /= (GLfloat)height;
// Vertex coordinates
auto vx1 = (GLfloat)crect.x1;
auto vy1 = (GLfloat)crect.y2;
auto vx2 = (GLfloat)crect.x2;
auto vy2 = (GLfloat)crect.y1;
auto vx1 = crect.x1;
auto vy1 = crect.y2;
auto vx2 = crect.x2;
auto vy2 = crect.y1;
// log_trace("Rect %d: %f, %f, %f, %f -> %d, %d, %d, %d",
// ri, rx, ry, rxe, rye, rdx, rdy, rdxe, rdye);
memcpy(&coord[i * 16],
(GLfloat[][2]){
(GLint[][2]){
{vx1, vy1},
{texture_x1, texture_y1},
{vx2, vy1},
@ -334,7 +326,7 @@ static void x_rect_to_coords(int nrects, const rect_t *rects, int dst_x, int dst
{vx1, vy2},
{texture_x1, texture_y2},
},
sizeof(GLfloat[2]) * 8);
sizeof(GLint[2]) * 8);
GLuint u = (GLuint)(i * 4);
memcpy(&indices[i * 6], (GLuint[]){u + 0, u + 1, u + 2, u + 2, u + 3, u + 0},
@ -363,7 +355,7 @@ void gl_compose(backend_t *base, void *image_data, int dst_x, int dst_y,
// screen, with y axis pointing down. We have to do some coordinate conversion in
// this function
auto coord = ccalloc(nrects * 16, GLfloat);
auto coord = ccalloc(nrects * 16, GLint);
auto indices = ccalloc(nrects * 6, GLuint);
x_rect_to_coords(nrects, rects, dst_x, dst_y, img->inner->width, img->inner->height,
gd->height, img->inner->y_inverted, coord, indices);
@ -448,13 +440,13 @@ bool gl_blur(backend_t *base, double opacity, void *ctx, const region_t *reg_blu
return true;
}
auto coord = ccalloc(nrects * 16, GLfloat);
auto coord = ccalloc(nrects * 16, GLint);
auto indices = ccalloc(nrects * 6, GLuint);
x_rect_to_coords(nrects, rects, extent_resized->x1, extent_resized->y2,
bctx->texture_width, bctx->texture_height, gd->height, false,
coord, indices);
auto coord_resized = ccalloc(nrects_resized * 16, GLfloat);
auto coord_resized = ccalloc(nrects_resized * 16, GLint);
auto indices_resized = ccalloc(nrects_resized * 6, GLuint);
x_rect_to_coords(nrects_resized, rects_resized, extent_resized->x1,
extent_resized->y2, bctx->texture_width, bctx->texture_height,
@ -474,9 +466,9 @@ bool gl_blur(backend_t *base, double opacity, void *ctx, const region_t *reg_blu
indices, GL_STATIC_DRAW);
glEnableVertexAttribArray(vert_coord_loc);
glEnableVertexAttribArray(vert_in_texcoord_loc);
glVertexAttribPointer(vert_coord_loc, 2, GL_FLOAT, GL_FALSE, sizeof(GLfloat) * 4, NULL);
glVertexAttribPointer(vert_in_texcoord_loc, 2, GL_FLOAT, GL_FALSE,
sizeof(GLfloat) * 4, (void *)(sizeof(GLfloat) * 2));
glVertexAttribPointer(vert_coord_loc, 2, GL_INT, GL_FALSE, sizeof(GLint) * 4, NULL);
glVertexAttribPointer(vert_in_texcoord_loc, 2, GL_INT, GL_FALSE,
sizeof(GLfloat) * 4, (void *)(sizeof(GLint) * 2));
glBindVertexArray(vao[1]);
glBindBuffer(GL_ARRAY_BUFFER, bo[2]);
@ -488,9 +480,9 @@ bool gl_blur(backend_t *base, double opacity, void *ctx, const region_t *reg_blu
GL_STATIC_DRAW);
glEnableVertexAttribArray(vert_coord_loc);
glEnableVertexAttribArray(vert_in_texcoord_loc);
glVertexAttribPointer(vert_coord_loc, 2, GL_FLOAT, GL_FALSE, sizeof(GLfloat) * 4, NULL);
glVertexAttribPointer(vert_in_texcoord_loc, 2, GL_FLOAT, GL_FALSE,
sizeof(GLfloat) * 4, (void *)(sizeof(GLfloat) * 2));
glVertexAttribPointer(vert_coord_loc, 2, GL_INT, GL_FALSE, sizeof(GLint) * 4, NULL);
glVertexAttribPointer(vert_in_texcoord_loc, 2, GL_INT, GL_FALSE,
sizeof(GLfloat) * 4, (void *)(sizeof(GLint) * 2));
int curr = 0;
glReadBuffer(GL_BACK);
@ -539,12 +531,6 @@ bool gl_blur(backend_t *base, double opacity, void *ctx, const region_t *reg_blu
glViewport(0, 0, gd->width, gd->height);
}
if (p->unifm_offset_x >= 0) {
glUniform1f(p->unifm_offset_x, 1.0f / (GLfloat)bctx->texture_width);
}
if (p->unifm_offset_y >= 0) {
glUniform1f(p->unifm_offset_y, 1.0f / (GLfloat)bctx->texture_height);
}
glDrawElements(GL_TRIANGLES, nrects * 6, GL_UNSIGNED_INT, NULL);
// XXX use multiple draw calls is probably going to be slow than
@ -808,8 +794,6 @@ void *gl_create_blur_context(backend_t *base, enum blur_method method, void *arg
// clang-format off
static const char *FRAG_SHADER_BLUR = GLSL(330,
%s\n // other extension pragmas
uniform float offset_x;
uniform float offset_y;
uniform sampler2D tex_scr;
uniform float opacity;
in vec2 texcoord;
@ -822,8 +806,7 @@ void *gl_create_blur_context(backend_t *base, enum blur_method method, void *arg
);
static const char *FRAG_SHADER_BLUR_ADD = QUOTE(
sum += float(%.7g) *
texture2D(tex_scr, vec2(texcoord.x + offset_x * float(%d),
texcoord.y + offset_y * float(%d)));
texelFetch(tex_scr, ivec2(texcoord + vec2(%d, %d)), 0);
);
// clang-format on
@ -877,10 +860,6 @@ void *gl_create_blur_context(backend_t *base, enum blur_method method, void *arg
glBindFragDataLocation(pass->prog, 0, "out_color");
// Get uniform addresses
pass->unifm_offset_x =
glGetUniformLocationChecked(pass->prog, "offset_x");
pass->unifm_offset_y =
glGetUniformLocationChecked(pass->prog, "offset_y");
pass->unifm_opacity = glGetUniformLocationChecked(pass->prog, "opacity");
pass->orig_loc = glGetUniformLocationChecked(pass->prog, "orig");
ctx->resize_width += kern->w / 2;
@ -937,7 +916,7 @@ const char *win_shader_glsl = GLSL(330,
uniform sampler2D tex;
void main() {
vec4 c = texture2D(tex, texcoord.xy);
vec4 c = texelFetch(tex, ivec2(texcoord), 0);
if (invert_color) {
c = vec4(c.aaa - c.rgb, c.a);
}
@ -1053,22 +1032,22 @@ static inline void gl_image_decouple(backend_t *base, struct gl_image *img) {
glClear(GL_COLOR_BUFFER_BIT);
// clang-format off
GLfloat coord[] = {
GLint coord[] = {
// top left
0, 0, // vertex coord
0, 0, // texture coord
// top right
(GLfloat)img->inner->width, 0, // vertex coord
1, 0, // texture coord
img->inner->width, 0, // vertex coord
img->inner->width, 0, // texture coord
// bottom right
(GLfloat)img->inner->width, (GLfloat)img->inner->height,
1, 1,
img->inner->width, img->inner->height,
img->inner->width, img->inner->height,
// bottom left
0, (GLfloat)img->inner->height,
0, 1
0, img->inner->height,
0, img->inner->height,
};
// clang-format on

2
src/backend/gl/gl_common.h
View File

@ -26,8 +26,6 @@ typedef struct {
// Program and uniforms for blur shader
typedef struct {
GLuint prog;
GLint unifm_offset_x;
GLint unifm_offset_y;
GLint unifm_opacity;
GLint orig_loc;
} gl_blur_shader_t;