Moving lens distortion shader into drivers and adding GLES2 support

5 files changed, 9 insertions, 165 deletions

diff --git a/modules/mobile_vr/SCsub b/modules/mobile_vr/SCsub
index e5725ceb6f..4bd184f025 100644
--- a/modules/mobile_vr/SCsub
+++ b/modules/mobile_vr/SCsub
@@ -6,5 +6,3 @@ Import('env_modules')
 env_mobile_vr = env_modules.Clone()
 
 env_mobile_vr.add_source_files(env.modules_sources, '*.cpp')
-
-SConscript("shaders/SCsub")
diff --git a/modules/mobile_vr/mobile_vr_interface.cpp b/modules/mobile_vr/mobile_vr_interface.cpp
index 2cabc7bd59..b9a404709e 100644
--- a/modules/mobile_vr/mobile_vr_interface.cpp
+++ b/modules/mobile_vr/mobile_vr_interface.cpp
@@ -297,49 +297,6 @@ bool MobileVRInterface::initialize() {
 		mag_current_min = Vector3(0, 0, 0);
 		mag_current_max = Vector3(0, 0, 0);
 
-#if !defined(SERVER_ENABLED)
-		// build our shader
-		if (lens_shader == NULL) {
-			///@TODO need to switch between GLES2 and GLES3 version, Reduz suggested moving this into our drivers and making this a core shader
-			// create a shader
-			lens_shader = new LensDistortedShaderGLES3();
-
-			// create our shader stuff
-			lens_shader->init();
-
-			glGenBuffers(1, &half_screen_quad);
-			glBindBuffer(GL_ARRAY_BUFFER, half_screen_quad);
-			{
-				/* clang-format off */
-				const float qv[16] = {
-					0, -1,
-					-1, -1,
-					0, 1,
-					-1, 1,
-					1, 1,
-					1, 1,
-					1, -1,
-					1, -1,
-				};
-				/* clang-format on */
-
-				glBufferData(GL_ARRAY_BUFFER, sizeof(float) * 16, qv, GL_STATIC_DRAW);
-			}
-
-			glBindBuffer(GL_ARRAY_BUFFER, 0); //unbind
-
-			glGenVertexArrays(1, &half_screen_array);
-			glBindVertexArray(half_screen_array);
-			glBindBuffer(GL_ARRAY_BUFFER, half_screen_quad);
-			glVertexAttribPointer(VS::ARRAY_VERTEX, 2, GL_FLOAT, GL_FALSE, sizeof(float) * 4, 0);
-			glEnableVertexAttribArray(0);
-			glVertexAttribPointer(VS::ARRAY_TEX_UV, 2, GL_FLOAT, GL_FALSE, sizeof(float) * 4, ((uint8_t *)NULL) + 8);
-			glEnableVertexAttribArray(4);
-			glBindVertexArray(0);
-			glBindBuffer(GL_ARRAY_BUFFER, 0); //unbind
-		}
-#endif
-
 		// reset our orientation
 		orientation = Basis();
 
@@ -362,17 +319,6 @@ void MobileVRInterface::uninitialize() {
 			arvr_server->clear_primary_interface_if(this);
 		}
 
-#if !defined(SERVER_ENABLED)
-		// cleanup our shader and buffers
-		if (lens_shader != NULL) {
-			glDeleteVertexArrays(1, &half_screen_array);
-			glDeleteBuffers(1, &half_screen_quad);
-
-			delete lens_shader;
-			lens_shader = NULL;
-		}
-#endif
-
 		initialized = false;
 	};
 };
@@ -448,48 +394,30 @@ void MobileVRInterface::commit_for_eye(ARVRInterface::Eyes p_eye, RID p_render_t
 	// We must have a valid render target
 	ERR_FAIL_COND(!p_render_target.is_valid());
 
-	// We must have an initialised shader
-	ERR_FAIL_COND(lens_shader != NULL);
-
 	// Because we are rendering to our device we must use our main viewport!
 	ERR_FAIL_COND(p_screen_rect == Rect2());
 
-	float offset_x = 0.0;
+	Rect2 dest = p_screen_rect;
 	float aspect_ratio = 0.5 * p_screen_rect.size.x / p_screen_rect.size.y;
 	Vector2 eye_center;
 
+	// we output half a screen
+	dest.size.x *= 0.5;
+
 	if (p_eye == ARVRInterface::EYE_LEFT) {
-		offset_x = -1.0;
 		eye_center.x = ((-intraocular_dist / 2.0) + (display_width / 4.0)) / (display_width / 2.0);
 	} else if (p_eye == ARVRInterface::EYE_RIGHT) {
+		dest.position.x = dest.size.x;
 		eye_center.x = ((intraocular_dist / 2.0) - (display_width / 4.0)) / (display_width / 2.0);
 	}
+	// we don't offset the eye center vertically (yet)
+	eye_center.y = 0.0;
 
 	// unset our render target so we are outputting to our main screen by making RasterizerStorageGLES3::system_fbo our current FBO
 	VSG::rasterizer->set_current_render_target(RID());
 
-	// now output to screen
-	//	VSG::rasterizer->blit_render_target_to_screen(p_render_target, screen_rect, 0);
-
-	// get our render target
-	RID eye_texture = VSG::storage->render_target_get_texture(p_render_target);
-	uint32_t texid = VS::get_singleton()->texture_get_texid(eye_texture);
-#if !defined(SERVER_ENABLED)
-	glActiveTexture(GL_TEXTURE0);
-	glBindTexture(GL_TEXTURE_2D, texid);
-
-	lens_shader->bind();
-	lens_shader->set_uniform(LensDistortedShaderGLES3::OFFSET_X, offset_x);
-	lens_shader->set_uniform(LensDistortedShaderGLES3::K1, k1);
-	lens_shader->set_uniform(LensDistortedShaderGLES3::K2, k2);
-	lens_shader->set_uniform(LensDistortedShaderGLES3::EYE_CENTER, eye_center);
-	lens_shader->set_uniform(LensDistortedShaderGLES3::UPSCALE, oversample);
-	lens_shader->set_uniform(LensDistortedShaderGLES3::ASPECT_RATIO, aspect_ratio);
-
-	glBindVertexArray(half_screen_array);
-	glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
-	glBindVertexArray(0);
-#endif
+	// and output
+	VSG::rasterizer->output_lens_distorted_to_screen(p_render_target, dest, k1, k2, eye_center, oversample);
 };
 
 void MobileVRInterface::process() {
@@ -512,8 +440,6 @@ MobileVRInterface::MobileVRInterface() {
 	k1 = 0.215;
 	k2 = 0.215;
 	last_ticks = 0;
-
-	lens_shader = NULL;
 };
 
 MobileVRInterface::~MobileVRInterface() {
diff --git a/modules/mobile_vr/mobile_vr_interface.h b/modules/mobile_vr/mobile_vr_interface.h
index 63cad4c738..05b6331f94 100644
--- a/modules/mobile_vr/mobile_vr_interface.h
+++ b/modules/mobile_vr/mobile_vr_interface.h
@@ -34,10 +34,6 @@
 #include "servers/arvr/arvr_interface.h"
 #include "servers/arvr/arvr_positional_tracker.h"
 
-#if !defined(SERVER_ENABLED)
-#include "shaders/lens_distorted.glsl.gen.h"
-#endif
-
 /**
 	@author Bastiaan Olij <mux213@gmail.com>
 
@@ -60,14 +56,6 @@ private:
 	float eye_height;
 	uint64_t last_ticks;
 
-#if !defined(SERVER_ENABLED)
-	LensDistortedShaderGLES3 *lens_shader;
-	GLuint half_screen_quad;
-	GLuint half_screen_array;
-#else
-	void *lens_shader;
-#endif
-
 	real_t intraocular_dist;
 	real_t display_width;
 	real_t display_to_lens;
diff --git a/modules/mobile_vr/shaders/SCsub b/modules/mobile_vr/shaders/SCsub
deleted file mode 100644
index 97a3598598..0000000000
--- a/modules/mobile_vr/shaders/SCsub
+++ /dev/null
@@ -1,6 +0,0 @@
-#!/usr/bin/env python
-
-Import('env')
-
-if 'GLES3_GLSL' in env['BUILDERS']:
-    env.GLES3_GLSL('lens_distorted.glsl');
diff --git a/modules/mobile_vr/shaders/lens_distorted.glsl b/modules/mobile_vr/shaders/lens_distorted.glsl
deleted file mode 100644
index 92604c891c..0000000000
--- a/modules/mobile_vr/shaders/lens_distorted.glsl
+++ /dev/null
@@ -1,62 +0,0 @@
-/* clang-format off */
-[vertex]
-
-layout(location = 0) in highp vec4 vertex_attrib;
-/* clang-format on */
-layout(location = 4) in vec2 uv_in;
-
-uniform float offset_x;
-
-out vec2 uv_interp;
-
-void main() {
-
-	uv_interp = uv_in;
-	gl_Position = vec4(vertex_attrib.x + offset_x, vertex_attrib.y, 0.0, 1.0);
-}
-
-/* clang-format off */
-[fragment]
-
-uniform sampler2D source; //texunit:0
-/* clang-format on */
-
-uniform vec2 eye_center;
-uniform float k1;
-uniform float k2;
-uniform float upscale;
-uniform float aspect_ratio;
-
-in vec2 uv_interp;
-
-layout(location = 0) out vec4 frag_color;
-
-void main() {
-	vec2 coords = uv_interp;
-	vec2 offset = coords - eye_center;
-
-	// take aspect ratio into account
-	offset.y /= aspect_ratio;
-
-	// distort
-	vec2 offset_sq = offset * offset;
-	float radius_sq = offset_sq.x + offset_sq.y;
-	float radius_s4 = radius_sq * radius_sq;
-	float distortion_scale = 1.0 + (k1 * radius_sq) + (k2 * radius_s4);
-	offset *= distortion_scale;
-
-	// reapply aspect ratio
-	offset.y *= aspect_ratio;
-
-	// add our eye center back in
-	coords = offset + eye_center;
-	coords /= upscale;
-
-	// and check our color
-	if (coords.x < -1.0 || coords.y < -1.0 || coords.x > 1.0 || coords.y > 1.0) {
-		frag_color = vec4(0.0, 0.0, 0.0, 1.0);
-	} else {
-		coords = (coords + vec2(1.0)) / vec2(2.0);
-		frag_color = textureLod(source, coords, 0.0);
-	}
-}