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render/gles2: fix y-inverted output when rendering to buffer

This commit is contained in:
Simon Ser 2020-06-11 18:40:29 +02:00
parent 6136fe87d1
commit 1245730ea2
1 changed files with 63 additions and 18 deletions
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71
render/gles2/renderer.c
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@ -214,8 +214,12 @@ static void gles2_scissor(struct wlr_renderer *wlr_renderer,
push_gles2_debug(renderer);
if (box != NULL) {
struct wlr_box gl_box;
if (renderer->current_buffer != NULL) {
memcpy(&gl_box, box, sizeof(gl_box));
} else {
wlr_box_transform(&gl_box, box, WL_OUTPUT_TRANSFORM_FLIPPED_180,
renderer->viewport_width, renderer->viewport_height);
}
glScissor(gl_box.x, gl_box.y, gl_box.width, gl_box.height);
glEnable(GL_SCISSOR_TEST);
@ -225,6 +229,12 @@ static void gles2_scissor(struct wlr_renderer *wlr_renderer,
pop_gles2_debug(renderer);
}
static const float flip_180[9] = {
1.0f, 0.0f, 0.0f,
0.0f, -1.0f, 0.0f,
0.0f, 0.0f, 1.0f,
};
static bool gles2_render_subtexture_with_matrix(
struct wlr_renderer *wlr_renderer, struct wlr_texture *wlr_texture,
const struct wlr_fbox *box, const float matrix[static 9],
@ -257,10 +267,15 @@ static bool gles2_render_subtexture_with_matrix(
abort();
}
float gl_matrix[9];
if (renderer->current_buffer != NULL) {
wlr_matrix_multiply(gl_matrix, flip_180, matrix);
} else {
memcpy(gl_matrix, matrix, sizeof(gl_matrix));
}
// OpenGL ES 2 requires the glUniformMatrix3fv transpose parameter to be set
// to GL_FALSE
float transposition[9];
wlr_matrix_transpose(transposition, matrix);
wlr_matrix_transpose(gl_matrix, gl_matrix);
push_gles2_debug(renderer);
@ -271,7 +286,7 @@ static bool gles2_render_subtexture_with_matrix(
glUseProgram(shader->program);
glUniformMatrix3fv(shader->proj, 1, GL_FALSE, transposition);
glUniformMatrix3fv(shader->proj, 1, GL_FALSE, gl_matrix);
glUniform1i(shader->invert_y, texture->inverted_y);
glUniform1i(shader->tex, 0);
glUniform1f(shader->alpha, alpha);
@ -309,15 +324,20 @@ static void gles2_render_quad_with_matrix(struct wlr_renderer *wlr_renderer,
struct wlr_gles2_renderer *renderer =
gles2_get_renderer_in_context(wlr_renderer);
float gl_matrix[9];
if (renderer->current_buffer != NULL) {
wlr_matrix_multiply(gl_matrix, flip_180, matrix);
} else {
memcpy(gl_matrix, matrix, sizeof(gl_matrix));
}
// OpenGL ES 2 requires the glUniformMatrix3fv transpose parameter to be set
// to GL_FALSE
float transposition[9];
wlr_matrix_transpose(transposition, matrix);
wlr_matrix_transpose(gl_matrix, gl_matrix);
push_gles2_debug(renderer);
glUseProgram(renderer->shaders.quad.program);
glUniformMatrix3fv(renderer->shaders.quad.proj, 1, GL_FALSE, transposition);
glUniformMatrix3fv(renderer->shaders.quad.proj, 1, GL_FALSE, gl_matrix);
glUniform4f(renderer->shaders.quad.color, color[0], color[1], color[2], color[3]);
glVertexAttribPointer(renderer->shaders.quad.pos_attrib, 2, GL_FLOAT, GL_FALSE,
@ -337,10 +357,15 @@ static void gles2_render_ellipse_with_matrix(struct wlr_renderer *wlr_renderer,
struct wlr_gles2_renderer *renderer =
gles2_get_renderer_in_context(wlr_renderer);
float gl_matrix[9];
if (renderer->current_buffer != NULL) {
wlr_matrix_multiply(gl_matrix, flip_180, matrix);
} else {
memcpy(gl_matrix, matrix, sizeof(gl_matrix));
}
// OpenGL ES 2 requires the glUniformMatrix3fv transpose parameter to be set
// to GL_FALSE
float transposition[9];
wlr_matrix_transpose(transposition, matrix);
wlr_matrix_transpose(gl_matrix, gl_matrix);
static const GLfloat texcoord[] = {
1, 0, // top right
@ -352,7 +377,7 @@ static void gles2_render_ellipse_with_matrix(struct wlr_renderer *wlr_renderer,
push_gles2_debug(renderer);
glUseProgram(renderer->shaders.ellipse.program);
glUniformMatrix3fv(renderer->shaders.ellipse.proj, 1, GL_FALSE, transposition);
glUniformMatrix3fv(renderer->shaders.ellipse.proj, 1, GL_FALSE, gl_matrix);
glUniform4f(renderer->shaders.ellipse.color, color[0], color[1], color[2], color[3]);
glVertexAttribPointer(renderer->shaders.ellipse.pos_attrib, 2, GL_FLOAT,
@ -472,16 +497,32 @@ static bool gles2_read_pixels(struct wlr_renderer *wlr_renderer,
if (pack_stride == stride && dst_x == 0 && flags != NULL) {
// Under these particular conditions, we can read the pixels with only
// one glReadPixels call
glReadPixels(src_x, renderer->viewport_height - height - src_y,
width, height, fmt->gl_format, fmt->gl_type, p);
uint32_t y = src_y;
if (renderer->current_buffer == NULL) {
y = renderer->viewport_height - height - src_y;
}
glReadPixels(src_x, y, width, height, fmt->gl_format, fmt->gl_type, p);
if (renderer->current_buffer != NULL) {
*flags = 0;
} else {
*flags = WLR_RENDERER_READ_PIXELS_Y_INVERT;
}
} else {
// Unfortunately GLES2 doesn't support GL_PACK_*, so we have to read
// the lines out row by row
for (size_t i = 0; i < height; ++i) {
glReadPixels(src_x, renderer->viewport_height - src_y - i - 1, width, 1, fmt->gl_format,
uint32_t y = src_y + i;
if (renderer->current_buffer == NULL) {
y = renderer->viewport_height - src_y - i - 1;
}
glReadPixels(src_x, y, width, 1, fmt->gl_format,
fmt->gl_type, p + i * stride + dst_x * fmt->bpp / 8);
}
if (flags != NULL) {
*flags = 0;
}
@ -510,6 +551,7 @@ static bool gles2_blit_dmabuf(struct wlr_renderer *wlr_renderer,
goto restore_context_out;
}
// TODO: get inverted_y right when current_buffer != NULL
// This is to take into account y-inversion on both buffers rather than
// just the source buffer.
bool src_inverted_y =
@ -517,9 +559,12 @@ static bool gles2_blit_dmabuf(struct wlr_renderer *wlr_renderer,
bool dst_inverted_y =
!!(dst_attr->flags & WLR_DMABUF_ATTRIBUTES_FLAGS_Y_INVERT);
struct wlr_gles2_texture *gles2_src_tex = gles2_get_texture(src_tex);
gles2_src_tex->inverted_y = src_inverted_y ^ dst_inverted_y;
if (renderer->current_buffer == NULL) {
// The result is negated because wlr_matrix_projection y-inverts the
// texture.
gles2_src_tex->inverted_y = !(src_inverted_y ^ dst_inverted_y);
gles2_src_tex->inverted_y = !gles2_src_tex->inverted_y;
}
if (!wlr_egl_make_current(renderer->egl, EGL_NO_SURFACE, NULL)) {
goto texture_destroy_out;