Added back shadow effect

3 files changed, 143 insertions, 147 deletions

diff --git a/render/fx_renderer/fx_pass.c b/render/fx_renderer/fx_pass.c
index 6a1570c..e825851 100644
--- a/render/fx_renderer/fx_pass.c
+++ b/render/fx_renderer/fx_pass.c
@@ -11,6 +11,7 @@
 #include "render/fx_renderer/fx_renderer.h"
 #include "render/fx_renderer/matrix.h"
 #include "render/pass.h"
+#include "types/fx/shadow_data.h"
 
 #define MAX_QUADS 86 // 4kb
 
@@ -18,6 +19,7 @@ struct fx_render_texture_options fx_render_texture_options_default(
 		const struct wlr_render_texture_options *base) {
 	struct fx_render_texture_options options = {
 		.corner_radius = 0,
+		.clip_box = NULL,
 	};
 	memcpy(&options.base, base, sizeof(*base));
 	return options;
@@ -189,6 +191,38 @@ static void setup_blending(enum wlr_render_blend_mode mode) {
 	}
 }
 
+// Initialize the stenciling work
+static void stencil_mask_init(void) {
+	glClearStencil(0);
+	glClear(GL_STENCIL_BUFFER_BIT);
+	glEnable(GL_STENCIL_TEST);
+
+	glStencilFunc(GL_ALWAYS, 1, 0xFF);
+	glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
+	// Disable writing to color buffer
+	glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
+}
+
+// Close the mask
+static void stencil_mask_close(bool draw_inside_mask) {
+	// Reenable writing to color buffer
+	glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
+	if (draw_inside_mask) {
+		glStencilFunc(GL_EQUAL, 1, 0xFF);
+		glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
+		return;
+	}
+	glStencilFunc(GL_NOTEQUAL, 1, 0xFF);
+	glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
+}
+
+// Finish stenciling and clear the buffer
+static void stencil_mask_fini(void) {
+	glClearStencil(0);
+	glClear(GL_STENCIL_BUFFER_BIT);
+	glDisable(GL_STENCIL_TEST);
+}
+
 // make sure the texture source box does not try and sample outside of the
 // texture
 static void check_tex_src_box(const struct wlr_render_texture_options *options) {
@@ -235,6 +269,11 @@ void fx_render_pass_add_texture(struct fx_gles_render_pass *pass,
 	wlr_render_texture_options_get_dst_box(options, &dst_box);
 	float alpha = wlr_render_texture_options_get_alpha(options);
 
+	struct wlr_box *clip_box = &dst_box;
+	if (!wlr_box_empty(fx_options->clip_box)) {
+		clip_box = fx_options->clip_box;
+	}
+
 	src_fbox.x /= options->texture->width;
 	src_fbox.y /= options->texture->height;
 	src_fbox.width /= options->texture->width;
@@ -262,8 +301,8 @@ void fx_render_pass_add_texture(struct fx_gles_render_pass *pass,
 
 	glUniform1i(shader->tex, 0);
 	glUniform1f(shader->alpha, alpha);
-	glUniform2f(shader->size, dst_box.width, dst_box.height);
-	glUniform2f(shader->position, dst_box.x, dst_box.y);
+	glUniform2f(shader->size, clip_box->width, clip_box->height);
+	glUniform2f(shader->position, clip_box->x, clip_box->y);
 	glUniform1f(shader->radius, fx_options->corner_radius);
 
 	set_proj_matrix(shader->proj, pass->projection_matrix, &dst_box);
@@ -298,6 +337,98 @@ void fx_render_pass_add_rect(struct fx_gles_render_pass *pass,
 	pop_fx_debug(renderer);
 }
 
+void fx_render_pass_add_stencil_mask(struct fx_gles_render_pass *pass,
+		const struct fx_render_rect_options *fx_options, int corner_radius) {
+	const struct wlr_render_rect_options *options = &fx_options->base;
+
+	struct fx_renderer *renderer = pass->buffer->renderer;
+
+	const struct wlr_render_color *color = &options->color;
+	struct wlr_box box;
+	wlr_render_rect_options_get_box(options, pass->buffer->buffer, &box);
+	assert(box.width > 0 && box.height > 0);
+
+	push_fx_debug(renderer);
+	setup_blending(WLR_RENDER_BLEND_MODE_PREMULTIPLIED);
+
+	glUseProgram(renderer->shaders.stencil_mask.program);
+
+	set_proj_matrix(renderer->shaders.stencil_mask.proj, pass->projection_matrix, &box);
+	glUniform4f(renderer->shaders.stencil_mask.color, color->r, color->g, color->b, color->a);
+	glUniform2f(renderer->shaders.stencil_mask.half_size, box.width * 0.5, box.height * 0.5);
+	glUniform2f(renderer->shaders.stencil_mask.position, box.x, box.y);
+	glUniform1f(renderer->shaders.stencil_mask.radius, corner_radius);
+
+	render(&box, options->clip, renderer->shaders.stencil_mask.pos_attrib);
+
+	pop_fx_debug(renderer);
+}
+
+void fx_render_pass_add_box_shadow(struct fx_gles_render_pass *pass,
+		const struct fx_render_rect_options *fx_options,
+		int corner_radius, struct shadow_data *shadow_data) {
+	const struct wlr_render_rect_options *options = &fx_options->base;
+
+	struct fx_renderer *renderer = pass->buffer->renderer;
+
+	const struct wlr_render_color *color = &shadow_data->color;
+	struct wlr_box box;
+	wlr_render_rect_options_get_box(options, pass->buffer->buffer, &box);
+	assert(box.width > 0 && box.height > 0);
+	struct wlr_box surface_box = box;
+	float blur_sigma = shadow_data->blur_sigma;
+
+	// Extend the size of the box
+	box.x -= blur_sigma;
+	box.y -= blur_sigma;
+	box.width += blur_sigma * 2;
+	box.height += blur_sigma * 2;
+
+	pixman_region32_t render_region;
+	pixman_region32_init(&render_region);
+
+	pixman_region32_t inner_region;
+	pixman_region32_init(&inner_region);
+	pixman_region32_union_rect(&inner_region, &inner_region,
+			surface_box.x + corner_radius * 0.5,
+			surface_box.y + corner_radius * 0.5,
+			surface_box.width - corner_radius,
+			surface_box.height - corner_radius);
+	pixman_region32_subtract(&render_region, options->clip, &inner_region);
+	pixman_region32_fini(&inner_region);
+
+	push_fx_debug(renderer);
+
+	// Init stencil work
+	stencil_mask_init();
+	// Draw the rounded rect as a mask
+	fx_render_pass_add_stencil_mask(pass, fx_options, corner_radius);
+	stencil_mask_close(false);
+
+	// blending will practically always be needed (unless we have a madman
+	// who uses opaque shadows with zero sigma), so just enable it
+	setup_blending(WLR_RENDER_BLEND_MODE_PREMULTIPLIED);
+	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+	glUseProgram(renderer->shaders.box_shadow.program);
+
+	set_proj_matrix(renderer->shaders.box_shadow.proj, pass->projection_matrix, &box);
+	glUniform4f(renderer->shaders.box_shadow.color, color->r, color->g, color->b, color->a);
+	glUniform1f(renderer->shaders.box_shadow.blur_sigma, blur_sigma);
+	glUniform1f(renderer->shaders.box_shadow.corner_radius, corner_radius);
+	glUniform2f(renderer->shaders.box_shadow.size, box.width, box.height);
+	glUniform2f(renderer->shaders.box_shadow.position, box.x, box.y);
+
+	render(&box, &render_region, renderer->shaders.box_shadow.pos_attrib);
+	pixman_region32_fini(&render_region);
+
+	glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
+
+	stencil_mask_fini();
+
+	pop_fx_debug(renderer);
+}
+
 static const char *reset_status_str(GLenum status) {
 	switch (status) {
 	case GL_GUILTY_CONTEXT_RESET_KHR:
diff --git a/render/fx_renderer/fx_renderer.c b/render/fx_renderer/fx_renderer.c
index d00b088..da9437c 100644
--- a/render/fx_renderer/fx_renderer.c
+++ b/render/fx_renderer/fx_renderer.c
@@ -183,43 +183,6 @@ static void fx_renderer_scissor(struct wlr_renderer *wlr_renderer,
 	pop_fx_debug(renderer);
 }
 
-void fx_renderer_stencil_mask_init(void) {
-	glClearStencil(0);
-	glClear(GL_STENCIL_BUFFER_BIT);
-	glEnable(GL_STENCIL_TEST);
-
-	glStencilFunc(GL_ALWAYS, 1, 0xFF);
-	glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
-	// Disable writing to color buffer
-	glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
-}
-
-void fx_renderer_stencil_mask_close(bool draw_inside_mask) {
-	// Reenable writing to color buffer
-	glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
-	if (draw_inside_mask) {
-		glStencilFunc(GL_EQUAL, 1, 0xFF);
-		glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
-		return;
-	}
-	glStencilFunc(GL_NOTEQUAL, 1, 0xFF);
-	glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
-}
-
-void fx_renderer_stencil_mask_fini(void) {
-	glClearStencil(0);
-	glClear(GL_STENCIL_BUFFER_BIT);
-	glDisable(GL_STENCIL_TEST);
-}
-
-void fx_renderer_stencil_enable(void) {
-	glEnable(GL_STENCIL_TEST);
-}
-
-void fx_renderer_stencil_disable(void) {
-	glDisable(GL_STENCIL_TEST);
-}
-
 static bool fx_render_subtexture_with_matrix(
 		struct wlr_renderer *wlr_renderer, struct wlr_texture *wlr_texture,
 		const struct wlr_fbox *box, const float matrix[static 9],
@@ -330,103 +293,6 @@ static void fx_render_quad_with_matrix(struct wlr_renderer *wlr_renderer,
 	pop_fx_debug(renderer);
 }
 
-static void fx_render_stencil_mask(struct fx_renderer *renderer,
-		const struct wlr_box *box, const float matrix[static 9],
-		int corner_radius) {
-	if (box->width == 0 || box->height == 0) {
-		return;
-	}
-	assert(box->width > 0 && box->height > 0);
-
-	// TODO: just pass gl_matrix?
-	float gl_matrix[9];
-	wlr_matrix_multiply(gl_matrix, renderer->projection, matrix);
-
-	// TODO: investigate why matrix is flipped prior to this cmd
-	// wlr_matrix_multiply(gl_matrix, flip_180, gl_matrix);
-
-	wlr_matrix_transpose(gl_matrix, gl_matrix);
-
-	glEnable(GL_BLEND);
-
-	struct stencil_mask_shader shader = renderer->shaders.stencil_mask;
-
-	glUseProgram(shader.program);
-
-	glUniformMatrix3fv(shader.proj, 1, GL_FALSE, gl_matrix);
-
-	glUniform2f(shader.half_size, box->width * 0.5, box->height * 0.5);
-	glUniform2f(shader.position, box->x, box->y);
-	glUniform1f(shader.radius, corner_radius);
-
-	glVertexAttribPointer(shader.pos_attrib, 2, GL_FLOAT, GL_FALSE,
-			0, verts);
-
-	glEnableVertexAttribArray(shader.pos_attrib);
-
-	glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
-
-	glDisableVertexAttribArray(shader.pos_attrib);
-}
-
-static void fx_render_box_shadow(struct fx_renderer *renderer,
-		const struct wlr_box *box, const struct wlr_box *stencil_box,
-		const float matrix[static 9], int corner_radius,
-		struct shadow_data *shadow_data) {
-	if (box->width == 0 || box->height == 0) {
-		return;
-	}
-	assert(box->width > 0 && box->height > 0);
-
-	float *color = shadow_data->color;
-	float blur_sigma = shadow_data->blur_sigma;
-
-	float gl_matrix[9];
-	wlr_matrix_multiply(gl_matrix, renderer->projection, matrix);
-
-	// TODO: investigate why matrix is flipped prior to this cmd
-	// wlr_matrix_multiply(gl_matrix, flip_180, gl_matrix);
-
-	wlr_matrix_transpose(gl_matrix, gl_matrix);
-
-	// Init stencil work
-	fx_renderer_stencil_mask_init();
-	// Draw the rounded rect as a mask
-	fx_render_stencil_mask(renderer, stencil_box, matrix, corner_radius);
-	fx_renderer_stencil_mask_close(false);
-
-	// blending will practically always be needed (unless we have a madman
-	// who uses opaque shadows with zero sigma), so just enable it
-	glEnable(GL_BLEND);
-
-	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
-
-	struct box_shadow_shader shader = renderer->shaders.box_shadow;
-
-	glUseProgram(shader.program);
-
-	glUniformMatrix3fv(shader.proj, 1, GL_FALSE, gl_matrix);
-	glUniform4f(shader.color, color[0], color[1], color[2], color[3]);
-	glUniform1f(shader.blur_sigma, blur_sigma);
-	glUniform1f(shader.corner_radius, corner_radius);
-
-	glUniform2f(shader.size, box->width, box->height);
-	glUniform2f(shader.position, box->x, box->y);
-
-	glVertexAttribPointer(shader.pos_attrib, 2, GL_FLOAT, GL_FALSE,
-			0, verts);
-
-	glEnableVertexAttribArray(shader.pos_attrib);
-
-	glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
-
-	glDisableVertexAttribArray(shader.pos_attrib);
-
-	glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
-
-	fx_renderer_stencil_mask_fini();
-}
-
 static const uint32_t *fx_get_shm_texture_formats(
 		struct wlr_renderer *wlr_renderer, size_t *len) {
 	struct fx_renderer *renderer = fx_get_renderer(wlr_renderer);
diff --git a/render/fx_renderer/shaders.c b/render/fx_renderer/shaders.c
index 6196d19..9257ca3 100644
--- a/render/fx_renderer/shaders.c
+++ b/render/fx_renderer/shaders.c
@@ -144,7 +144,6 @@ static bool link_stencil_mask_program(struct stencil_mask_shader *shader) {
 	shader->proj = glGetUniformLocation(prog, "proj");
 	shader->color = glGetUniformLocation(prog, "color");
 	shader->pos_attrib = glGetAttribLocation(prog, "pos");
-	shader->tex_proj = glGetUniformLocation(prog, "tex_proj");
 	shader->position = glGetUniformLocation(prog, "position");
 	shader->half_size = glGetUniformLocation(prog, "half_size");
 	shader->radius = glGetUniformLocation(prog, "radius");
@@ -161,7 +160,6 @@ static bool link_box_shadow_program(struct box_shadow_shader *shader) {
 	shader->proj = glGetUniformLocation(prog, "proj");
 	shader->color = glGetUniformLocation(prog, "color");
 	shader->pos_attrib = glGetAttribLocation(prog, "pos");
-	shader->tex_proj = glGetUniformLocation(prog, "tex_proj");
 	shader->position = glGetUniformLocation(prog, "position");
 	shader->size = glGetUniformLocation(prog, "size");
 	shader->blur_sigma = glGetUniformLocation(prog, "blur_sigma");
@@ -190,15 +188,16 @@ bool link_shaders(struct fx_renderer *renderer) {
 		return false;
 	}
 
-	// TODO: Fix the shader compilation errors
-	// // stencil mask shader
-	// if (!link_stencil_mask_program(&renderer->shaders.stencil_mask)) {
-	// 	return false;
-	// }
-	// // box shadow shader
-	// if (!link_box_shadow_program(&renderer->shaders.box_shadow)) {
-	// 	return false;
-	// }
+	// stencil mask shader
+	if (!link_stencil_mask_program(&renderer->shaders.stencil_mask)) {
+		wlr_log(WLR_ERROR, "Could not link stencil mask shader");
+		return false;
+	}
+	// box shadow shader
+	if (!link_box_shadow_program(&renderer->shaders.box_shadow)) {
+		wlr_log(WLR_ERROR, "Could not link box shadow shader");
+		return false;
+	}
 
 	return true;
 }