From a3d4189a0bc4e157eb6478cab3c03a4905952486 Mon Sep 17 00:00:00 2001
From: Andri Yngvason <andri@yngvason.is>
Date: Thu, 5 Mar 2020 19:13:41 +0000
Subject: [PATCH] render: Add output transforms

---
 include/render.h |  4 ++++
 src/main.c       |  2 +-
 src/render.c     | 47 +++++++++++++++++++++++++++++++++++++++--------
 3 files changed, 44 insertions(+), 9 deletions(-)

diff --git a/include/render.h b/include/render.h
index 4175cb4..7614b87 100644
--- a/include/render.h
+++ b/include/render.h
@@ -18,6 +18,8 @@
 
 #include <GLES2/gl2.h>
 #include <EGL/egl.h>
+#include <wayland-client-protocol.h>
+#include <wayland-client.h>
 
 struct dmabuf_frame;
 
@@ -33,6 +35,7 @@ struct renderer {
 
 	uint32_t width;
 	uint32_t height;
+	enum wl_output_transform transform;
 
 	GLint read_format;
 	GLint read_type;
@@ -45,6 +48,7 @@ struct renderer {
 };
 
 int renderer_init(struct renderer* self, uint32_t width, uint32_t height,
+                  enum wl_output_transform transform,
                   enum renderer_input_type input_type);
 void renderer_destroy(struct renderer* self);
 
diff --git a/src/main.c b/src/main.c
index b0fae7c..81804c7 100644
--- a/src/main.c
+++ b/src/main.c
@@ -783,7 +783,7 @@ int main(int argc, char* argv[])
 			RENDERER_INPUT_DMABUF : RENDERER_INPUT_FB;
 	if (renderer_init(&self.renderer, self.selected_output->width,
 		          self.selected_output->height,
-		          renderer_input_type) < 0) {
+			  WL_OUTPUT_TRANSFORM_NORMAL, renderer_input_type) < 0) {
 		log_error("Failed to initialise renderer\n");
 		goto failure;
 	}
diff --git a/src/render.c b/src/render.c
index 55cc699..8414745 100644
--- a/src/render.c
+++ b/src/render.c
@@ -63,6 +63,41 @@ enum {
 	X_GL_EXTENSIONS
 #undef X
 
+static const float transforms[][4] = {
+	[WL_OUTPUT_TRANSFORM_NORMAL] = {
+		1.0f, 0.0f,
+		0.0f, 1.0f,
+	},
+	[WL_OUTPUT_TRANSFORM_90] = {
+		0.0f, -1.0f,
+		1.0f, 0.0f,
+	},
+	[WL_OUTPUT_TRANSFORM_180] = {
+		-1.0f, 0.0f,
+		0.0f, -1.0f,
+	},
+	[WL_OUTPUT_TRANSFORM_270] = {
+		0.0f, 1.0f,
+		-1.0f, 0.0f,
+	},
+	[WL_OUTPUT_TRANSFORM_FLIPPED] = { // TODO
+		1.0f, 0.0f,
+		0.0f, 1.0f,
+	},
+	[WL_OUTPUT_TRANSFORM_FLIPPED_90] = { // TODO
+		1.0f, 0.0f,
+		0.0f, 1.0f,
+	},
+	[WL_OUTPUT_TRANSFORM_FLIPPED_180] = { // TODO
+		1.0f, 0.0f,
+		0.0f, 1.0f,
+	},
+	[WL_OUTPUT_TRANSFORM_FLIPPED_270] = { // TODO
+		1.0f, 0.0f,
+		0.0f, 1.0f,
+	},
+};
+
 int gl_format_from_fourcc(GLenum* result, uint32_t format)
 {
 	switch (format) {
@@ -333,6 +368,7 @@ void renderer_destroy(struct renderer* self)
 }
 
 int renderer_init(struct renderer* self, uint32_t width, uint32_t height,
+                  enum wl_output_transform transform,
                   enum renderer_input_type input_type)
 {
 	if (!eglBindAPI(EGL_OPENGL_ES_API))
@@ -416,6 +452,7 @@ int renderer_init(struct renderer* self, uint32_t width, uint32_t height,
 
 	self->width = width;
 	self->height = height;
+	self->transform = transform;
 	glGetIntegerv(GL_IMPLEMENTATION_COLOR_READ_FORMAT, &self->read_format);
 	glGetIntegerv(GL_IMPLEMENTATION_COLOR_READ_TYPE, &self->read_type);
 
@@ -491,10 +528,7 @@ int render_dmabuf_frame(struct renderer* self, struct dmabuf_frame* frame)
 
 	glUniform1i(self->shader.u_tex, 0);
 
-	const float proj[] = {
-		1.0f, 0.0f,
-		0.0f, 1.0f,
-	};
+	const float* proj = transforms[self->transform];
 	glUniformMatrix2fv(self->shader.u_proj, 1, GL_FALSE, proj);
 
 	gl_render();
@@ -528,10 +562,7 @@ int render_framebuffer(struct renderer* self, const void* addr, uint32_t format,
 
 	glUniform1i(self->shader.u_tex, 0);
 
-	const float proj[] = {
-		1.0f, 0.0f,
-		0.0f, 1.0f,
-	};
+	const float* proj = transforms[self->transform];
 	glUniformMatrix2fv(self->shader.u_proj, 1, GL_FALSE, proj);
 
 	gl_render();