*: introduce a projection matrix and winmodesrev3

The bulk of this is mechanical wiring up of a projection_x to all
the nodes.

But this also introduces maintenance of the projection_x, with
aspect-ratio preservation in two of the modes: WINDOWED and
FULLSCREEN, with the previously default stretched-to-fill
fullscreen mode now relegated to a third FILLSCREEN winmode.

The default at startup is now an aspect ratio-preserving windowed
mode.

Simply press the 'f' key at any time to cycle through them.

This was mostly done in sars to provide a source-available test
for reproducing a fullscreen SDL2 bug I filed @
https://github.com/libsdl-org/SDL/issues/5139

Otherwise it's pretty silly to bother with doing anything on
sars...  but it is a handy little mule for such things.

1 files changed, 8 insertions, 4 deletions

diff --git a/src/plasma-node.c b/src/plasma-node.c
index 1bc0e40..1eb4c7a 100644
--- a/src/plasma-node.c
+++ b/src/plasma-node.c
@@ -22,19 +22,21 @@
 #include "glad.h"
 #include "plasma-node.h"
 #include "shader-node.h"
+#include "m4f.h"
 
 
 static const char	*plasma_vs = ""
 	"#version 120\n"
 
+	"uniform mat4	projection_x;"
+
 	"attribute vec3 vertex;"
 	"attribute vec2 texcoord;"
 
 	"void main()"
 	"{"
 	"	gl_TexCoord[0].xy = texcoord;"
-	//"	gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;"
-	"	gl_Position = vec4(vertex, 1.f);"
+	"	gl_Position = projection_x * vec4(vertex, 1.f);"
 	"}"
 "";
 
@@ -78,16 +80,18 @@ static void plasma_uniforms(void *uniforms_ctxt, void *render_ctxt, unsigned n_u
 
 	glUniform1f(uniforms[0], alpha);
 	glUniform1f(uniforms[1], play_ticks(play, PLAY_TICKS_TIMER0) * .001f); // FIXME KLUDGE ALERT
+	glUniformMatrix4fv(uniforms[2], 1, GL_FALSE, &model_x->m[0][0]);
 }
 
 
 /* create plasma rendering stage */
-stage_t * plasma_node_new(const stage_conf_t *conf)
+stage_t * plasma_node_new(const stage_conf_t *conf, m4f_t *projection_x)
 {
-	return	shader_node_new_src(conf, plasma_vs, plasma_fs, NULL, plasma_uniforms, NULL, 2,
+	return	shader_node_new_src(conf, plasma_vs, plasma_fs, projection_x, plasma_uniforms, NULL, 3,
 			(const char *[]){
 				"alpha",
 				"time",
+				"projection_x",
 			}
 		);
 }