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Provide user with transformation matrix

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This commit is contained in:
Scott Anderson 2017-06-07 16:43:57 +12:00
parent 6f5c70ac69
commit 53dd622263
3 changed files with 77 additions and 48 deletions
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56
example/rotation.c
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@ -16,13 +16,13 @@
static const GLchar vert_src[] =
"#version 310 es\n"
"precision mediump float;\n"
"layout(location = 0) uniform mat2 transform;\n"
"layout(location = 0) uniform mat4 transform;\n"
"layout(location = 0) in vec2 pos;\n"
"layout(location = 1) in float angle;\n"
"out float v_angle;\n"
"void main() {\n"
" v_angle = angle;\n"
" gl_Position = vec4(transform * pos, 0.0, 1.0);\n"
" gl_Position = transform * vec4(pos, 0.0, 1.0);\n"
"}\n";
static const GLchar frag_src[] =
@ -38,41 +38,6 @@ static const GLchar frag_src[] =
" 1.0);\n"
"}\n";
static const GLfloat 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] = {
-1.0f, 0.0f,
0.0f, 1.0f,
},
[WL_OUTPUT_TRANSFORM_FLIPPED_90] = {
0.0f, 1.0f,
1.0f, 0.0f,
},
[WL_OUTPUT_TRANSFORM_FLIPPED_180] = {
1.0f, 0.0f,
0.0f, -1.0f,
},
[WL_OUTPUT_TRANSFORM_FLIPPED_270] = {
0.0f, -1.0f,
-1.0f, 0.0f,
},
};
struct state {
float angle;
struct timespec last_frame;
@ -172,8 +137,8 @@ static void output_frame(struct wl_listener *listener, void *data) {
struct output_state *ostate = wl_container_of(listener, ostate, frame);
struct state *s = ostate->state;
float width = ostate->output->width;
float height = ostate->output->height;
int32_t width = ostate->output->width;
int32_t height = ostate->output->height;
glViewport(0, 0, width, height);
// All of the odd numbered transformations involve a 90 or 270 degree rotation
@ -183,14 +148,13 @@ static void output_frame(struct wl_listener *listener, void *data) {
height = tmp;
}
// Single pixel in gl coordinates
float px_w = 2.0f / width;
float px_h = 2.0f / height;
int32_t mid_w = width / 2;
int32_t mid_h = height / 2;
GLfloat vert_data[] = {
-250 * px_w, -250 * px_h, s->angle,
0 * px_w, +250 * px_h, s->angle + 2.0944f, // 120 deg
+250 * px_w, -250 * px_h, s->angle + 4.18879f, // 240 deg
mid_w - 200, mid_h - 200, s->angle,
mid_w, mid_h + 200, s->angle + M_PI * 2.0f / 3.0f, // 120 deg
mid_w + 200, mid_h - 200, s->angle + M_PI * 4.0f / 3.0f, // 240 deg
};
glUseProgram(s->gl.prog);
@ -199,7 +163,7 @@ static void output_frame(struct wl_listener *listener, void *data) {
glBindBuffer(GL_ARRAY_BUFFER, s->gl.vbo);
glBufferData(GL_ARRAY_BUFFER, sizeof(vert_data), vert_data, GL_STATIC_DRAW);
glUniformMatrix2fv(0, 1, GL_FALSE, transforms[ostate->output->transform]);
glUniformMatrix4fv(0, 1, GL_TRUE, ostate->output->transform_matrix);
glClearColor(0.0, 0.0, 0.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);